D GESTRA

GESTRA SPECTORconnect Marketandusage

Benefits at a glance

More safety, more efficiency, moresteam

Intelligent, global monitoring

Anextensive and adjustable data connectionenables global systemmonitoring. Clear graphics, historic dataand alarms provide clear information about the steam generation process.

Alwaysstateof theart

SPECTORconnectsatisfiesthe requirements ofthe lateststandards forsafesteam boiler operation.

Oneunit, several functions

All the important functions necessary for efficient system operation have been integrated ina single unit, saving installation time and cutting costs.

Reliable service interval monitoring

The plant operator is informed when components requirea service or the system is outside its normal operating range.

Constantly low energy consumption, reduced process costs

Temperature-compensated measurement and control of conductivity in the steam drum itself reduces the blowdown volume to an absolute minimum.

The SPECTORconnect system is used in steam and hot water boiler systems to EN 12952 and EN 12953.

Development has consistently focused on safety,enablinga SIL2/3 rating to beenachieved for conductivity limiting as well.

The URB 6O display unit functions as a data interface and supports various data protocols.

The pressure and temperature ratings are up to 183 bar and 3 5 7 ^ { \circ } \complement

Less is more!

From little acorns big oaks grow. With SPECTORconnect by GESTRA,a new era has begun in the measurement and control of boiler systems:

■Less cabling (preconfigured cable connection)
■Less installation work
■Less space needed in control cabinets
■Fewer control units
■Less wear and tear
■Less maintenance
■Fewer production outages
■Lower costs
■More control
■Better process overview
■Higher availability
■Enhanced reliability
■Greater plant efficiency
■Better utilization of energy
■Longer plant operation times

1. No risk of overheating:

■Patented thermal barrier in cylindrical body above electrode flange
■Electronic temperature protection in the terminal box
■Patentedconnectionarrangement
■Minimizationof thermal effects

2.Easy installationandmaintenance:

■Freely accessible connecting terminals at the control units ■Large terminal box makes for easy installation

3. Increased safety:

■Active cable monitoring with more than twice the previous maximum cable length ■Easy to integrate into visual display and auto mation systems

GESTRA SPECTORsmart

Keep your plant up and running

The SPECTORconnect system keeps the steam boilerrunningreliably.However,unforeseen events can happen at any time and impact the boiler system.The SPECTORsmart provides a detailed overview of your plant,and displays all the events detected by sensors.This way, alarms canbe triggered immediately for the relevantarea,enabling targeted intervention. The days of time-consuming fault localisation are past! What's more,the system can let you knowwhen maintenance is due,reducing the likelihood of sudden failure.

Improve efficiency and sustainability

The industry has committed to continually reducing emissions.We help you play your part.

With SPECTORsmart, steam production is constantly monitored and readings logged.Set parametersareoptimisedtoenhanceboiler efficiency.This means lower fuel consumption and therefore better \mathsf { C O } _ { 2 } figures.The results havea positive effect on your sustainability targets!

19 <br>19

GESTRA Steam Boiler Equipment SPECTORconnect

“SMART”water level limiting system: level electrodewith periodic self-testing NRG16-60, level switch URS 60

2“SMART”high level limiting system with periodic self-testing:level electrode NRG 16-61, level switch URS 61

Continuous water level control system: level electrode NRG 26-6O,level controller NRR2-60

Direct water level indicator

Conductivity control /continuous and intermittent boiler blowdown:conductivity electrode LRG 16-61, continuous blowdown controller LRR 1-60, continuous blowdown valve BAE 46

Sample cooler PK for safe and precise manual sampling

Flash vessel for heat recovery

Blowdown cooler for heat recovery

Intermittent blowdown valve MPA,three-way pilot valve

四Blowdown receiver
Pressure limiter
正Pressure controller/transmitter
Pressure gauge
1Safety valve
Safety temperature limiter for superheater,resistance thermometer TRG 5-65,temperature transmitter TRV 5-60
Thermometer
Strainer GSF
Vent valve
\boxed { \mathbb { E } } Shut-off and bypass valve GAV
\boxed { 1 0 } Non-return valve RK 86
Electrically/pneumatically operated control valve GCV
22Feedwater pump
23Make-up water monitoring: full demineralization viaconductivity monitoring LRG 16-9/LRS 1-7, partly demineralization via monitoring residual hardness
24Burner control with MODbus RTU interface
25Burner
26Superheater
27Economiser
28Operating unit URB 60
29SPECTORcontrol isauniversal controllerand operating unit for process data acquisition (with CAN,MODbus, Ethernet, OPC and optional Profibus interface) and can be used instead of URB60

SPECTORmodule

1Compact design reduces installation work
Easilyaccessible connection terminals
■Supply voltage 24VDC,i.e.independent of national supply voltages
■Features specific to your application enable rapid start-up
■Easy operation via rotary knob/pushbutton ensures fast setup and installation
■A7-segment numeric display provides information on the latest readings and messages

SPECTORmoduleTouch

1Separationof power components and operating level,i.e.no elaborate wiring needed in the control cabinet door.

se of a colour touch display for intuitive,clear operating that is language-neutral

Level: DIntuitive operating through touch display incl.visualization of the actual,set and control values DTrend line for identifying potential optimisation measures ■Pl control response Optional:←3-element control ·Actual-value output 4-20 mA
Conductivity:DIntuitive operating through touch display incl.visualization of theactual,setand control values DType approval as per “wU 1 0 0 ^ { \circ } (VdTUV bulletin on water monitoring facilities) DIntegrated flushing pulse for reducing manual maintenance DIntegrated,program-controlledintermittntblowdownmeansnoeparatemoduleisequiredforactuatingthebowdownalve DInterlocking inputtoprevent simultaneousoperationoftwoor more intermitentblowdown valvesatone blowdown receiver

The 24 VDC version offers the following advantages:

Standard DC supply network for sensors and electronic control units,dispensing with the need foradditional wiring Enhanced EMC properties for lower sensitivity to interference and therefore improved availability Independence from different national mains voltages

Only 230 VAC available as the supply voltage?No problem, we have tailormade power supply units to bridge the gap.

Total power consumption of connected equipment

<12W <60W <120W

The total power output of the connected equipment determines which power supply unit is used and/ or whether the existing 2 4 \nu DC supply system can accept the additional load.

The 24VDC versions of the sensing units LRGT and NRGThave established themselvesand facilitate a standardized voltagesupplyarrangement.

GESTRA Steam Boilder Equipment SPECTORmodule

1“SMART”level electrodeNRG16-50 for low-water level limiting, levelswitch NRS 1-50,SIL3

2Separate“SMART”level electrode NRG 16-51 for high level alarm,level switch NRS 1-51,SIL3

Water level control with high level alarm, remote indication of water level: level electrode NRG 26-21, level controller NRR2-52andcontrol valve GCV

Flash vessel
Blowdown cooler
Automatic intermittent blowdown: intermittent blowdown valve MPA, pilot valve
1Blowdown receiver
Pressure limiter DSF
12Pressure transducer DRT
Pressure indication
14Safety valve GSV
\boxed { \boxed { 1 } } Safety temperature monitor/limiter, resistance thermometer TRG,temperature switch TRS 5-50,L3
GThermometer
1 Strainer
18Vent valve
\boxplus （204号 Shut-off valve and bypass valve
\boxed { 2 } Non-return valve
21Electrically/pneumatically operated control valve GCV
22Feedwater pump
23Feedwater/condensate monitoring
24Burner control
25Burner
26Superheater
27Economiser

4Direct water level indicator

EConductivity control & indication, conductivity limit switch and continuous blowdown control: conductivity electrode LRGT 16-2, continuous blowdown controller LRR1-53, continuous blowdown valve BAE

Sample cooler

GeSTRA

Steamand Condensate System

√ Non-return valve RK 86 with special spring 20 mbar
□ Steam trap with trap monitoring equipment, test chamber VKE,electrode NRG 16-19, test station NRA1-3 for up to 16 steam traps
V Contamination detectors (ingress of acids,alkalis,etc.): Conductivity electrode LRG 16-9, Conductivity switch LRS 1-7a
W Monitoring forthe ingress of foreignsubstancessuchasoil, grease etc.: Oil and turbidity detector OR 52/5
区 Pneumatic three-way control valve forthedischarge of contaminatedcondensate
? Condensate receiver tank
Z Safety circuit

GESTRATypeDesignationsforBoilerControls

{ sf { G } } = Sensor
{ \sf N } = Power supply unit
sf { R } = Controller
sf { S } = Switch
{ sf { T } } = Transmitter
sf { V } = Preamplifier

1 \ = Conductivity 2 \ = Capacitance ~ 3 ~ = Ultrasonic （20 4 \ = Photoelectric 5 \ = Temperature

Type Approval Number Code

Classification societies for marineapplications

Lloyd's Register
See-Berufsgenossenschaft
Registro Italiano Navale
American Bureau of Shipping
Korean Register of Shipping
Bureau Veritas
Det Norske veritas
TUV SWB 02 403 LR See BG RINA A ABS KR BV
Safety DNV
Measured quantity
（20 \boldsymbol { \mathsf { W } } = Water
（204号 { sf { T } } = Temperature
（204号 sf { D } = Pressure TUV Bulletin
Function
（204号 tt { B } = Limiter Yearofapproval
{ sf { R } } = Controller orextension
sf { S } = Switch
\boldsymbol { \mathsf { W } } = Detector
WUL \ c = Water monitoring for conductivity (acids,alkalis,raw water etc.)
WUF \mathbf { \Sigma } = \mathbf { \Sigma } Water monitorina for inaress of foreian matter (oils.fats.arease.etc.)

GeSTRA

GeSTRA

Principles of Measurement

Conductivitymeasurement

The water level is detected between the electrode tipsand the vessel wall (or reference electrode) and evaluated for control or limitation purposes. In this case it is essential that the medium is electrically conductive. The high-integrity self-monitoring design of the level alarms ensures constant supervision of the insulating seal and electrode entry, immediately recognizing malfunctions in the system and failure of the electrode or supply cables.In addition,the equipment features periodic self-checking of the electronic control unit and the corresponding output contacts. Boilers of group IV require "SMART" (self-monitoring and routine testing) equipment.

Before installation,the length of the conductivity electrode rods must be cut to the required switching levels.

Capacitancemeasurement

Electrode rod and vessel wall (or reference electrode) forma capacitor;air and the fluid to be controlled act as dielectric.Due to the different dielectric constants of air and boiler water the capacitance value between the electrode and the vessel wall changes concurrently with level changes. The switchpoints can be continuously adjusted during operation and multiplied by connecting in parallel several electronic control units.

Types of Controls

Waterlevel limiters

(High-level/low-levelalarms) As soonas thewater level exceeds or falls below the adjusted switchpoints the burner protection circuit is interrupted (low level) or the feed pump is switched off (high level).

On-off level control

Thewater level iscontrolledbetweentwo fixed oradjustable switchpoints.The signals are directly transmitted to the feed pumpor valve.

Modulating level control

Thewater level is continuously monitored and the actual value is compared with the adjusted set point by the associated controller. If a deviation between the two values is detected, a signal willbe sent to the control valve to re-adjust the flowrateaccordingly,thereby enablingamore economic and efficient steam plant operation.

Field Bus System

SPECTORconnect

The SPECTORconnect system transfers the digitized measurement dataacquired by the level probe to the electronic control unit located in the control cabinet.The centerpiece ofthissystem is the stable and sophisticated CANbus (Controller Area Network). Several sensors and switches can be interconnected via one bus line.

Apartfromactive cablemonitoringa CANbus system offers a host of benefits,such as increased design flexibility,reduced installation effort,optimized openand closed loopcontrol, centralized operation and remote monitoring.

The standardised network opens up highly flexible possibilities for configuration.The CANopen protocol is used nowadays in medical equipment,electronic devices formarine applications,public means of transport and in burner and boiler controls of power plants.

Thanks to the many CANbus applications a great number of equipment and interface componentsarewidelyavailable,providingan ideal addition to our product range.

Digital Data Exchange

GeSTRA

GESTRA SPECTORconnect boiler equipment:

The SPECTORconnect system digitally transmits measurement data from the probe to the electronic control unit in the control cabinet.It does this bymeans of a stable,sophisticated CAN (Controller Area Network) bus.

Several sensors and amplifiers can be interconnected bymeans of a CAN bus line.In addition to the active cable monitoring achieved in this way,the system offers numerous advantages for the planning, installation, display and optimisation of open-loop and closed-loop control systems,and enables problem-free link-up with other open bus

GeSTRA

Thereliabilityofwater level limitersmadeby GESTRA exceeds the requirement of the EN directives for SIL2 safety chains.The system consists of two electrodes and one level switch.

The system is self-monitoring and features positive-action safetyrelays,extensive fault analysis for rapid detection of malfunctions and separate error messaging for both limiters.

LevelLimitation (Lowand High Level Alarms) SPECTORconnect

D GESTRA

Level Limitation

Low-Level Limiter

Control unit URS 6O in conjunction with one level electrode type NRG 16-60,17-60,19-60 or 111-60 constitutes a high-integrity selfmonitoring low-level limiterwith periodic self-checking and automatic routine testing of output relay contacts. Function:

■Low-level alarm with one switchpoint.

The equipment detects min.water level (low-level alarm).

Application insteamand pressurized hotwater boilers according to EN12952/..53.

Control unit URS 6O in conjunction with two level electrodes type NRG16-60,17-60, 19-60 or 111-60 constitutes a high-integrity self-monitoring low-level limiting system with periodic self-checking.The control unit features the following function:

■Low-level alarmwith two switchpoints.

The equipment combination detects lowwater level (low-level alarmsystem).

Application insteamand pressurized hotwaterboilers according to EN12952/..53.

The electric device complies with the regulations forsafetycircuits to DINEN50156.

The liquid level dataare transferred from the electrode NRG 1..-6O to the control unit via CAN bus,using the CANopen protocol.

Thesafetytemperature limitertype TRG5-6./ TRV 5-60 can be added to the system; for more information refer to pages 132-133.

High-Level-Alarm

Control unit URS 1-61 in conjunction with one level electrode type NRG 16-61,17-61, 19-61 or 111-61 constitutesa high-integrity self-monitoring high-level alarmsystemwith periodic self-checking and automatic routine testing of output relay contacts.Function:

High-levelalarm

The equipment detects the max.water level.

Application insteamandpressurized hotwaterboilers according to EN12952/..53.

The electric device complies with the regulations for safety circuits to DIN EN 50156.

The liquid leveldataare transferred from the electrode NRG1...-61 to the control unit via CAN bus,using the CAN open protocol.

BoilerProtectionSystem

Description

The control unit URS 6O in combination with two level electrodes NRG1.-60,the temperature sensor TRG 5-6../TRV 5-6O constitutes a self-monitoring boiler protection system with periodic self-testing and continuous monitoring of the output relays.The control unit features the following functions:

Low-levelalarmwithtwoswitchpoints

The equipment combination detects the min.
water level (low-level limiting system).

■Safety temperature limiter

The equipment combination detects the max.
allowable temperature.

■High-levelalarm

The equipment combination detects the max.
water level.

\equiv 0 { \mathsf r } other customized combination.

If more than four limiters are required, the controlunit URS 61canalsobe integrated in the system.

Application insteamand (pressurised) hotwaterplants inaccordancewith EN 12952/..53.

The electrical equipment meets the requirementsof theregulations forsafetycircuits according to DIN EN 50156.

The data of the sensors are transferred to the control unit via CANbus,using the CANopen protocol.

GeSTRA

SIL3

WaterLevelControl SPECTORconnect

DGeSTRA

Level Controller NRR2-60 Level Controller NRR2-61

- type approved -
■3-position Pl stepping controller with High and Low level alarm
■Optional: 3-element control
■Supporting rail for installation in control cabinets
Input:
■Capacitance level electrode NRG 26-60
■CANopen input signal
■1 input for feedback potentiometer 0-1000Ω
■For connecting the operating unit URB 60
Output:
■1 volt free changeover contact for valve Open ／Stop／Closed
■1actual value current output 4-20 mA
■Protection: IP 40
■Supply connection: 24V DC; 4 W
■Weight: 0 . 8 \mathsf {kg } （204号
- type approved
■Continuous-action Pl controller with two Highand two Low level alarms
■Optional: 3-element control
■Supporting rail for installation in control cabinets
Input:
■Capacitance level electrode NRG 26-60
■2 inputs 4-20 mA for flow metering
■CANopen input signal
■1 input for feedback potentiometer 0-1000Ω
■For connecting the operating unit URB 60
Output:
■1current output 4-20 mA for valve control
■1 actual value current output 4- 20 mA
■4volt free changeover contacts for High/ Low level alarm
■Protection: IP 40
■Supply connection: 24V DC;4 W
■Weight: 0 . 8 ~ \mathsf {kg } （204号

Operating&DisplayUnitURB60

For panel mounting 1 3 6 x 9 6 ~ { {mm } }
Input:
■Interface for data exchange with
■SPECTORconnect system
User interface
■Touchscreen,analog,resistive,resolution 6 4 0 x 4 8 0 pixels
■Illuminated
Electrical connection:
■1 three-pole connector for voltage supply
■1 nine-pole D-SUB connector for SPECTORconnect
Ethernet interface
■MODbus TCP
■Supply connection:24V DC,8 VA
Protection:
Front: IP 65
■Back: IP 20
■Weight: 1.0 kg

Capacitance Level Electrode NRG 26-60

-type approved -
For continuous signalling of liquid levels
■Pressure rating PN 40
■Measuring range: \mathsf { H } = 3 0 0 - 2 0 0 0 \mathsf {mm } （204号
■Connection:G /"EN ISO 228-1
Materials:
■Housing: 1.4571
■Measuring electrode:1.4571
■Electrode insulation: PTFE
■Terminal box: 3.2161 (G ALSl8CU3)
Output:
■Incorporated in SPECTORconnect system Display&Operation
■Male/female connector M12 with 5 poles, A coded
■Seven-segment display with rotary push button
■Supply voltage: 24V DC,4W
■Protection: IP 65
■Weight: 2.0 kg

Open& Closed Loop Control and Visual Indication SPECTORconnect

SPECTORcontrol // -The open/closed-loop control, display and operator unit

System description

10.4" infrared TFT touchscreen (IP 65)
with the following interfaces
-2\* Ethernet for Intranet/OPC/Modbus TCP communication
-CANopen
- Modbus RTU RS232 for a specific burner connection
- USB interface for backup / upload function
- BACnet (optional)
- Profibus DP (optional)

IBus terminals formounting on a support rail for a maxiumum of: - 40 digital inputs 2 4 \nu - 40 digital inputs for relay /volt-free -20 analog inputs (4..20 mA,10R..1K2, 0..10V, PT 100) - 20 analog inputs (4..20 mA,0..10V)

Function

The SPECTORcontrol(SC) is an open/closedloop control, display and operatingunit for avariety ofuses in the control of technical equipment.All parameters,e.g.fora flowrate measurement,a steam calculator or regulator, can be set via the touchscreen with no programming knowledge.

Use of the SC means that open and closedloop controland operator functionsareall integrated in the unit.As a result, there is no need for the usual regulators from the SPECTORconnect family, such as the NRR 2-60 or URB.Additional signals are processed viaan lO terminal.

Thesystem allows the processing of digital and analogue signals,and the seting of alarm and switching thresholds.These signals can be switched directly on the regulator or further processed by the logic and calculation functions,for example.Next, they are transmitted onceagainviaadigital oranalogue output (IPO model).

A great variety of switch-specific tasks can therefore be accomplished with these signals. This reduces the control cabinet layout to a minimum.The interfaces also provide the option of retrieving data from various burner controls (Lamtec,Siemens/Landis&Staefa) and incorporating these in the open/closedloop control and display functions.

Likewise,there is the option of forwarding all operating data via Ethernet to service partners for remote support or to central control systems,or to configure them from here.

Example regulators

Continuous regulators
Continuous pump regulators (FU)
3-position stepping regulators
2-position valve/pump regulators
3-component regulators
Automatic intermittent blowdown control
with pulse repetition
Metering regulators

Depending on the control loop,regulators can feature the following:

P,Pl orPlDcharacteristic
Deadzone
Soft start
Automatic runtime-dependent pump
switchover
Preset operating positions

Open& Closed Loop Control and Visual Indication SPECTORconnect

DGeSTRA

SPECTORcontrol Il

The SPECTORmodule Touch series is based on extensive experience gained over more than 3O years and designed for evaluating and optimizing established systems and their integral components.

The level controller NRR 2-5.offers a wide range of standard applications and features some additional extras thatallow design engineers and operators to find the optimum system that meets their specific requirements.

D GESTRA

Newly developed equipment

ThenameSPECToRmodulestandsfor advanced and future-oriented system solutions, tailored to the needs and requirements of our customers.This innovative new product family combinesmodularitywithexceptional functionalityand sets new standards in various areas and sectors.

Inaddition to the self-monitoring and routine testing ("SMART") MIN/MAXwater level limiterswith EUandTUVapprovalandcertified functional safety SIL 3 we can now offer asafety temperaturemonitor/limiter that provides the same safety level.

When it comes to safety don't take any changes.

As you can see in the following table,there are two versions of the SPECTORmodule product family:

■SPECToRmodule offersall essential functions and provides significant benefits over the old conventional equipment. ■SPECToRmodule Touch boasts user-friendly functions which are based on the highly advanced features of the field-proven SPECTORconnect product range.This system offers a host of benefits and sets the trend for technological progress.

Many of the advantages offered by the new product familyare listedas follows.On the next page you will also find a synopsis of the old/new equipment and their respective functions and benefits.

SPECTORmodule

■Compact design reduces installationwork ■Easily accessible connecting terminals ■Supply voltage 24 VDC,which means that the equipment works independently of the national supply network ■Easy operation via rotary knob/pushbutton ensures fast setup and installation ■A 7-segment numeric display provides information on the latest readings and messages

SPECTORmoduleTouch

■Operator control level separated from power switchgear,whichmeans thatno elaborate wiring in control cabinet is required
■The URB 55 canshowboth the level controller and conductivity controller simultaneously
■User-friendlyand language-independent operation thanks to intuitive colour touch screen
□Level: ·Intuitive operation via touch screen operator panel with visual display of actual value, setpoint and value of manipulatedvariable ·Trend line for identifying potential optimisation measures ·Pl control action O Optional: O Three-component control □ Conductivity: ·Intuitive operation via touch screen operator panel with visual display of actual value,setpoint and value of manipulated variable ·Prototype approval in acc.with WU 100 (VDTUV Bulletin "Water Monitoring Equipment 100") ·Integrated flushing pulse for reducing manual maintenance ·Integrated,programmed intermittent blowdown control means no separate module is required for actuating the blowdown valve DInterlocking input for preventing the simultaneous operation of two or more intermittent blowdown valves connected to one blowdown receiver

This new product family supersedes all old analogue control equipment.

When designing the new SPECToRmodule product range we made sure that the new equipment will also work with existing sensors.

Self-Monitoring Low/High-Level Alarms SPECTORmodule

Description

Functional Safety

Since the international standards IEC 61508 and IEC 61511 for functional safety came into effect there has been an ever-increasing demand for analyzing equipment and process instruments that meet the requirements according to the SIL (Safety Integrity Level) classification.The European directives EN12952 and12953 demand thata hazard analysis shall be carried out for each limiting device function and appropriate levels of functional safety be implemented.

Note1states:,TypicalSafetyIntegrityLevel (SIL)requirements for boiler protective systems are not less than 2 ^ { \ast }

Functionalsafetyispartof the overall safety of asystem that depends on the correct functioning of safety-related (sub)systems and external equipment for risk reduction.

This means that functional safety covers only oneaspect of the overall safety.Other issues suchas electricalsafety,fireand radiation protection etc.do not fall within the scope of functional safety.

In modern systems electronic and,in particular,programmable systems performsafety functions to an ever increasing extent.As a consequence it is of utmost importance to assure the correct functioning of complex programmable systems.It is thereforeessential to establish suitable methods for preventing systematic faults (usually due to human error committed during the specification and implementation phase)and for controlling failures,abnormalitiesand loss of function (usually physical phenomena). In this context the term “safety integrity of the protective or safety function"is used.

The European standard IEC 61508 “Functional safetyofelectrical/electronic/programmable electronic safety-related systems"defines procedures, techniques,measures etc.for the functional safetyof E/E/PE systems.

Water-level limiter NRG1.-5O/NRS1-50

Applicationand Purpose

The level electrode NRG 1.-50 in conjunction with level switch NRS 1-5O is designed as self-monitoringwater level limiterwith routine testing("SMART") acc.to the European Standards EN 12952 and EN 12953. The equipment combination detects the minimumadmissible level and serves as low level limiter in steam boilers and (pressurized) hot-water installations.According to the ENbody of rules two SMARTwater level limiters are required.The system is SIL3 certified inaccordance with IEC 61508.

The level electrode NRG 1.-50 can be combined with the following GESTRA systems:

■NRG26-21/NRGT26-2/NRR2-52/-53 (modulating level control)
■NRG 26-21/NRGT26-2/NRR2-50/-51 (modulating level control)
■NRG26-21/NRGT26-2/NRS2-50 (on-off level control)
■NRG 16-52/NRS1-54 (on-off level control)
■NRG16-4/NRS1-52 (high-level limiter)
■NRG 16-51/NRS 1-51 (self-monitoring high-level limiter)
■NRG 16-52/NRS1-56 (universal on-off control)

The level electrode NRG 17-50 can be combined with the following GESTRA systems:

■NRG 17-51/NRS 1-51 (high-level limiter)

The level electrode NRG 19-50 can be combined with the following GESTRA systems:

■NRG19-51/NRS1-51 (high-levellimiter)

Combination of water-level limiterand controller NRG16-36/NRS1-50/NRS1-54

Application and Purpose

The level electrode NRG 16-36 isa combination of a water level controllerand a selfmonitoringwater level limiterwith routine testing("SMART")acc.totheEuropeanStandards EN 12952 and EN 12953.In conjunction with the on-off level controller NRS 1-54 the equipment detects the maximumwater level ("High level limiter") and controls the level in the boiler.In conjunction with the level switch NRS 1-50 the equipment detects and limits theminimumwater level.The equipment combination is used in steam boilers and (pressurized) hot-water installations.

Design NRS 1-50

Plastic case with freelyaccessible terminals, for installation in control cabinets.The equipment can be snapped onto a 3 5 ~ \mathsf {mm } support rail.Field enclosure for one or more units available on request.

The system is certified to SIL3.

Design NRS 1-54

Plastic case for installation in control cabinet. The equipment can be snapped onto a 35 mm support rail.Field enclosure for one or more units available on request.

Typeapproval
TUV SWB xx-422
SIL3
Optional: NRS 1-50
Special voltage:100..240V,47..62 HZ

DUSTED

Type approval
NRS 1-50
TUV SWB xX-422
SIL3
NRS 1-54
TUVWB/WR15-424

Optional: NRS 1-50 Special voltage:100..240 V, 47..62 HZ

.50

High-LevelAlarms

Description "Conventional Design" NRG16-4/NRS1-52

Application and Purpose

Usein combinationwith level switch NRS1-52 forwater-level limiting (high-level alarm) in electrically conductive liquids.The austenitic version is particularly suited for aggressive fluids.For vessels and steam boilers up to PN40 with level switch inaccordance with EN 12953 (boiler operation without constant supervision).

Sensing unit for high-level alarm.

Design

The level electrodeNRG16-4 isavailablewith screwed connection 3 / { 8 } ^ { \prime } 0

Material: 1.4571

The electrodesare supplied indifferent lengths.For switching levels between these dimensions the electrode tip can be cut to length as required.Wiring to the electrode is effected bya four-pole connector.

"Self-Monitoring"

NRG1.-51/NRS1-51

Application and Purpose

Use in combination with level switch NRS 1-51 as self-monitoring high-level alarm with periodic self-checking according to EN12953 for high-water level detection/ limiting (high-levelalarm) insteamand pressurized hot-water boilers.

Design

The high-level limiting system comprises level electrode NRG16-51,NRG 17-51 or NRG 19-51 and level switch NRS 1-51.

The system is certified to SIL 3.

Thelevel electrodesNRG16-51,NRG17-51 and NRG 19-51 consist of a measuring electrode fitted ina body.The electrode is insulated by special insulating seals.

The pressure-tight connection of the electrode is effected coaxially with a contact ring and a stud.A system of compression springs in the electrode body ensures sufficient sealing forces at the insulating seals,even if temperatures vary.The stud is insulated by a PTFE foil. Contact ring and body are connected to the four-pole connector base by PTFE insulated wires.The level electrode is availableinvarious lengthsup to 1 5 0 0 ~ { {mm } } 美 Observe mounting instructions (see examples of installation).The system (electrode ^ + level switch) complies with the regulations concerning safety circuits in accordance with DIN EN 50156-1/VDE0116.

High-Level Alarms- Conventional Design

Type approval NRS 1-52 TUV WB/WR xX-424

DUSTED

Typeapproval
TUV SHWS xX-423
SIL3
Optional: NRS 1-51
Special voltage:100..240V,47..62 HZ .50

GeSTRA

Description

Level control NRG26-21/NRGT26-2/ NRR2-52/-53

This modulating level control system comprises the level electrode NRG 26-../NRGT26-2 with universal operating unit (URB 55) and the level controller NRR 2-52/-53.

The level-dependent actual value sensed by the electrode is continuously compared bythe controllerwith theadjusted setpoint. Anydeviationis immediatelydetectedanda signal is transferred to the motorized feedwatercontrol valve in orderto regulate the flowrate accordingly.

The level controller is a Pl controllerwith manual control.The equipment features additional functions such as high level alarm, first low level alarm ("LoLo") and an actual valueoutput forremote indicationof the water level.

The switchpoints are adjustable within the whole measuring range of the level electrode.

The NRR2-52worksas three-position stepping controller, the NRR 2-53 as continuous controller.

Level controlNRG26-21/NRGT26-2/NRS2-51

Thiswater level controller isacombination ofa level electrode NRGT26-...and a level switch NRS 2-51.

The equipment can also detect and signal high leveland first low level.

Remote indication of thewater level is possible if the 4 { * } 2 0 \mathsf { m A } output and the LED bargraph display are used.

Theadvantage of this switching controller lies in customized switchpoints which can be adjusted during operation and the simultaneous use of several control units.

Level control 706/NRR2-52/-53

Used in conjunction with controller type NRR for modulating water level control (pressure range > PN 40).

Can also be used as combination electrode togetherwith limiters.The 7O6 isaradarbased level transducer.The reflexion time isa function of the level and will be transformed into a 4 . . . 2 0 \mathsf { m A } standard output signal by the measuring transducer.

Modulating control with adjustable switchpoints
Pressure rating PN 40 URB55 Deoxre Level controller Level probe NRR 2-52 NRG 26-21 00000000000000 High-level alarm DN 50 mm 。 4..20 mA Connecting flange 00000000000000 First low-level alarm NRGT Livh leutrol 26-1 Pneumatic control valve GCV Low level M 0000。 ElectricallyoperatedcontrolvalveGCV 0000

.30

Control valvewith isolating bypass valve,strainer, non-return valve and feedback potentiometer

Pressure rating PN 40

On-off control with adjustable switchpoints Pressure rating PN 6

High-Pressure Level Control

D GESTRA

SPECTORcompact

Where formerly two devices were required, all youneednowis justasingle Spectorcompact.Asacombined level electrodeand controller,it presentsthe economical alternative for monitoring liquid levels in small installations and steam boilers.

Since the entire electronic control unit is located within the terminal box, the transmissionpathisshortandreliabilityis higher than with comparable systems.

System Description NRGS 1... -1

The compact system NRGS11-1 or NRGS 16-1works according to the conductivity measurement principle.With the NRGS1...-1 amaximum of four levels can be signalled in conductive liquids:

High-level alarm,first low-levelalarm, pump oN, pump oFF,with one switchpoint each.

The NRGS 1..-1 has a level switch integrated in the electrode case for the control of all functions.An external switching device is not required.

System Description NRGS 1...-2

The compact system NRGS 11-2,NRGS 16-2 worksaccording to the conductivitymeasurement principle.With the NRGS 1...-2amaximum of three levels can be signalled in conductive liquids:

■Low-level alarm,pump oN,pump oFF, with one normally open contact.

The NRGS1..-2 has a level switch integrated in the electrode case for the control of all functions.An external switching device is not required.

The NRGS1...-2 has two electrode tips for the detection of low-water level.The low-level alarm is signalled via two separate switching channels.

Featuresand Benefits SPECTORcompact

System Description NRGT26-2

■Patented temperature barrier in cylindrical body above electrode flange
Terminal box equipped with excess temperature fuse ( 1 0 2 ^ { \circ } \mathsf { C } )
■Level electrode and controller in one unit
■ Optimum system adaptation thanks to modular design
■No mounting of component parts in control cabinet - No space requirements - No installation - No wiring - Easy planning
■No special cable required forwiring sensing unit to control cabinet
■Simplified logistics -Only one item of equipment has to be ordered and checked upon receipt - Reduced inventory requirements and simplified stocking - No onerous assignment procedures of individual component parts to mechanical engineering dept. (boiler) and measurement and control engineering dept. (control cabinet)
Interchangeswith old float-operated systems since they have their output contacts also integrated in the terminal box.

The compact system NRGT 26-2 works according to the capacitance measurement principle.The NRGT 26-2 is used for signalling different levels in conductive and insulating liquids.

■Modulating control ensures that the liquid level is always within the predefined measuring range of the electrode

The NRGT 26-2 has a level transmitter integrated in the electrode case which produces astandard analogue output of 4-20 mA. An external switching device is not required.

Pump Control Units

Individual control systems

forsteam regenerators,desuperheaters,etc. conventional system or freely programmable (on request)

Type approval TUV WRB xx-388

Compact system for water-level limitation and on-off control

Type approvalTUV WR/WB xx-388

Compact system for modulating level control

Pump control

LUSTED

AccessoriesforLiguid-LevelAlarmsFitted inExternalLevel Control Pots

Description

Level pot for external installation of level electrodes

Stop ValveGAV

Purpose

For isolating and throttling non-corrosive and aggressive gases,steam and liquids, e. g.air,steam,gas,oil etc.inall industries.

GAVFeatures

■With stuffing box ■Detachable locking device for al sizes ■Optional limit switch(es) Y-type drain valve 17/213

Additional equipment for the external installation of liquidlevelalarms

SRL 6-50

Purpose

In combination with external low-level alarms for monitoring the periodic purging of level pots or, generally,as timer for monitoring any periodic function.

Particularly suitable for steam plant operation to EN 12953.

Design

All-electronic logic unit SRL-5o for continuous monitoring,with three LEDs (stand-by,purging,switching off) with case for mounting on walls.

Operation

The monitoring equipment with Mini-PLC periodically activates a memory fora defined period of time.During this period the memory registersall functional operations, e. g.purging of the level pot. If this signal is not receivedwithin the fixed period, the plant isshut down. The plant is also shut down if the purging process lasts for more than five minutes.

AccessoriesforLiguidLevel Alarms Fitted in External Level Control Pots

Accessories for high-integrity level controls fitted

Accessories for high-integrity level controls fitted in an external level control pot SPECTORconnect

More measuring pots see page 144

Level Control for Very High Pressure/Temperature Ranges

D GESTRA

Design

The probe works without any moving parts. The probe rod,which is insulated by a ceramictube,isinsertedthroughaholein the probe flange such that pressure-tight sealing isensured.The ceramic tube is closedat the lower end and covered bya protection tube. The electronic control unit is housed in the terminal box.Thewiring is effected viaa 6 pole connector with crimp connection.

Operation

The principle of capacitance measurement is used to sense liquid levels.The probe rod and the protection tube forma capacitor,with air or the particular liquid being the dielectric. In electrically conductive liquids the probe insulationservesas dielectric.As the level rises or falls,the capacitance of this assembly changes,is converted in the integral measuringtransducer intoasignal,andis then fed to the associated electronic control unit.

NRG 211

In combination with level switch NRS 2-4 for indicating high-water levelatvery high pressuresand temperatures (up to PN320, 5 5 0 ^ { \circ } \mathsf { C } ) .Application in draining systems of conventional power stations and highpressure steam boilers.

NRS 2-4

The level switch NRS 2-4 is an analogue electronicamplifierforthecapacitance electrode type NRG 211.

In combinationwith this level electrode the unit can detect high water level.In addition, the level switch evaluates possible malfunctionsignals coming from the electrode and monitors the electrodesupplycableandcan therefore be used as part of a controlled draining system in power stations.

Marine Applications Level Electrodesand Controls

Description

Steamboilerequipmentformarineapplications has to complywith the same requirements as those placed on land installations. In addition to that further demands regarding environmental conditions such as climate, vibrations etc.have to be met.

Theacceptancecertificatesaretobe issued by the classification society responsible for the ship's acceptance inspection.

For marine applications see page 104.

GeSTRA

Optional100-240 VACNRS1-50,for1electrode 31011415053NRS1-50,for2 electrodes 31012415053

Optional NRG 16-38s,115V50-60 HZ .56 NRG16-38s,230V50-60 HZ e.g.3582044.

Level electrodesand controls formarineapplications

Optional NRG16-39s,115V50-60 HZ .56 NRS1-50,230V,50-60 HZ .50.53

Optional NRGT26-1S,115V50-60 HZ .52 NRGT26-1S,230V,50-60 HZ e.g. 3211452.

Industrial Electronics

Page

Temperaturedetectionand control SPECTORconnect. .132-133
Temperaturedetectionand control SPECTORmodule. ..134-135

Conductivity Monitoring

Basic principles * application ..136 Technical specification.. ..137 Conductivitymonitoring SPECTORconnect/compact. ..138 Conductivity monitoring SPECTORconnect/compact with automatic temperature compensation.139 Conductivity control with manual or automatic temperature compensation SPECTORmodule. .140-141 Conductivity monitoring with automatic temperature compensation LRG 16-9/LRS 1-7. .142-143

Ancillaries

Tee pieces,level potsand portable measuring instruments. 144

Continuous blowdown valves 145-146

Intermittent programm-controlled blowdown systems .147-148
Rapid-action intermittentblowdownvalves .149-150

Contaminationdetectors for condensateand process liquids

Detecting ingress of oil in condensate systems and marine installations .151-152
Ingress of oil in coolingwatersystems digital indicator. 153

Flowmeters for steam, gasesand liquids 154

GeSTRA

URS 60/ 61 ControllerwithSafetyFunction

Self-monitoring temperature limiter with periodic self-checking feature to be used in conjunctionwitha resistance thermometer type TRG 5-6..and pre-amplifier TRV 5-60. The equipment operates as asafety temperature controller,or in conjunction withan external lock-out inaccordancewith DIN EN 50156 as a safety temperature limiter. An alarm is given as soonas the temperature exceeds a preset limit value.The TRV 5-60 features digital indicators for theactual temperature and switching-off temperature.

Examplesof Installation

Superheaters forsteam boilerplants operating without constant supervision EN 12953.
■Superheater cascades with up to 4 steps
■In pressurized hot-water plants as temperature limiter for the secondary circuit in accordancewith12952/..53.
Furnaces inaccordancewith DiN30683 up to 8 0 0 ^ { \circ } \mathsf { C }
■Control systems for product heating or cooling

Technical Data of Temperature Sensor

Technical DataofTemperature Pre-Amplifier

TUV STW 1182 06
DIN CERTO TR/TW118206
SIL2

D GESTRA

TRS 5-50

Self-monitoring temperature switch with periodic self-checking feature to be used in conjunctionwitharesistance thermometer type TRG 5-....

Theequipment operatesasasafety temperature controller,or in conjunction with anexternal lock-out inaccordance with EN14597asasafety temperature limiter. Analarm is givenas soonas the temperature exceedsa preset limitvalue.Via the optional current output the temperature can be indicated externallyat the same time.The system is SIL3 certified.

Examplesof Installation

■Superheaters forsteam boilerplants operating without constant supervision EN 12953.
■Inpressurized hot-waterplants as temperature limiter for thesecondary circuit in accordance with EN 12952/..53.
Furnaces in accordance with DIN 30 683 up to 6 5 0 ^ { \circ } 0
■Return-temperature control acc.to EN 12953.
■Control systems for product heating or cooling.

TRS 5-52

The min./max.temperature switch TRS 5-52 in combination with temperature sensor TRG 5-63,TRG 5-64,TRG 5-65,TRG 5-66,TRG 5-67 and TRG 5-68 serves as temperature controlleraccording to EN14597.Application insteam boilers, pressurized hot-water plants operating withoutconstantsupervisionEN12953as wellasany other type of heat generator. The equipment raises an alarm when the preset MIN/MAX limit value is attained. Optional current output 4 { * } 2 0 \mathsf { m A } foractual value indication.

Technical DataofTemperature Sensor

Designs

\mathtt { a } = Field case { \mathfrak { b } } = Plug-in unit in plastic case { \mathfrak { c } } = 1 9 " slide-in unit \boldsymbol { \mathsf { e } } = Case for panel mounting

Safetytemperaturelimiteracc.toEN12953

GeSTRA

Type approval
DINCERTOSTW/STB1230
EGZ-IS-TAF-MUC-12-10-103881-009
SIL 3
Optional:
100-240VAC
4-20 mA (0..650°C)

.50
.57

Type approval
DIN CERTO TW 1232
Optional:
TRS 5-50,100-240 VAC4-20mA ( 0 . . . 6 5 0 ^ { \circ } \mathsf { C } ) （204号

.50
.57

Conductivity Monitoring BasicPrinciples * Application

D GESTRA

Function

All boiler water contains some dissolved solids.These impurities are constantly concentrated due to the evaporation process, i.e.the total dissolved solids (TDS) level increases.If the TDS level were to exceed the permissible maximum stipulated by the boilermanufacturer,foaming and carry-over would take place,leading to contamination of the steam distribution system.As a result, the operational reliability of the plant will be impaired,and the boiler and steam system can be badly damaged.

Effective blowdown can be provided by use of blowdown controller in conjunction with conductivity electrode and continuous blowdown valve BAE 46-211/ball valve 510.

Basics

Degree of dissociation { \mathfrak { a } } \approx 2 - 3 \ % / \circ { \mathfrak { C } }

Whichwatervaluesmust beadhered to and where can Ifind a specification of the demands made on boilerwater monitoring through continuous and intermittent blowdown?

In plantswith temperaturesabove 2 5 ^ { \circ } \complement the influence of temperatures on conductivity is an important factor to be considered.Due toelectrolytic dissociation (desintegration of a compound in a solution) conductivity increases considerably:

The requirements made on make-up, boiler and heating water are stipulated in the European Standards EN12952-12 (water-tube boilers) and EN 12953-10 (fire-tube boilers).

Temperature compensation ( \overline { { \mathbf { I } } } ^ { \circ } Comp)

Conductivity measurement, 4-electrode system

For more information refer to:
VdTUV/AGFW Bulletins
■TCh 1452:Quick-steaming unit
■TCh 1453:Steam generator <= 6 8 bar
■TCh 1466:Hot-water generator
VGB Guideline
■VGB-R450L:Water-tube boiler
Where can Ifind more information on boiler water monitoring?The European Standards
EN 12952-7 and EN 12953-6 (Equipment)
aswellas the Ordinanceof Industrial Safety ("BetrSichV")and the associated Regulations for Industrial Safety TRBS2141,part2 will help.

Analternating voltage is applied to two electrode tips (polarization).The current flow is directly proportional to the specific conductivity of the fluid. Particularly suitable for pure fluids applications up to 5 0 0 \mu { S } / \zeta \mathsf { m } (e.g. steam regenerators,condensate/feedwater tanks, steam generating units>PN 40 etc.).

Manual temperature compensation is suitable forplantswith steadyservice temperatures.The actual conductivity is obtained by carrying outa comparison measurement (calibration) to offset thermal errors.

Automatic temperature compensation (ATC) is ideal for plants with varying service temperatures in order tomake conductivity values independent of changes in ambient temperatures.The measured and the indicated values always refer to 2 5 ^ { \circ } \mathsf { C } and are constantly compensated for changes in pressure and temperature.

Conductivity measurement, 2-electrode system

The 4-electrode method is used in order to improve the quality of the measuring result and to avoid polarisation.This measuring method separates the current-carrying from the voltage-carrying measuring electrodes, which means that the measurement is performed without current and therefore free of polarisation and that dirt deposits can be compensated to a large extent. Particularly well suited for boiler water with high conductivities (e.g.industrial steam boilers up to PN 40).

Deposits of fine suspended solids forming scale on the heating surfaces and settling at thebottomof the boilerare the resultof residual hardness oran excessive phosphate content within the boiler water.These scale formations form a heat insulating layer, whichmeans that the heat transfersurfaces are now subject to design pressure, but at elevated temperature,which in turn can causedeformationandevenan explosion. The answer to this problem is the use of continuousblowdowntimerTA5/10,solenoidvalve6340andintermittentblowdown valveMPA46/MPA47/MPA48/MPA110.

Principles ofMeasurement

GeSTRA

Technical Data of Conductivity Electrodes

Technical Dataof Electronic Control Units

Conductivity monitoring SPECTORconnect/compact

GeSTRA

LRG16-60/17-60

The conductivity electrode LRG 16-60 /17-60 works acc.to the conductivity measurement principle.

LRG 16-61

The conductivity electrode LRG 16-61 features 4 electrodes working according to the conductivity measurement principle.

The LRG 16-6x/17-60 is designed for signalling the TDS value (conductivity) in electrically conductive liquids:

■Conductivity permanently within predefined control range of the electrode.

The LRG16-6x/17-60 is to be used in conjunction with the conductivity controller LRR1-60 or further system components. The conductivity data are transferred to the conductivity controllerorothersystemcomponents via CAN data bus.

LRR 1-60

The conductivity controller LRR1-6O is used in conjunction with conductivity electrode LRG 16-60 /17-60 for conductivity monitoring and control.The conductivity controller has the following functions:

■Two limits with one switchpoint each (highlevelalarm,low-level alarm) or high-level alarm and intermittent blowdown program control.
■Three-position control with predefined proportional band.
■Conductivity maintained within the control band defined by preset limits.

The LRR 1-6O features an output for a standard signal 4-20 mA.The conductivity data are transferred from the electrode LRG 16-60/ LRG 17-6O to the conductivity controller via CAN data bus.

URS 60

The safety controller in conjunction with the conductivity electrode LRG 16-6x/17-60 forms a conductivity measuring and limiting system.The conductivity limiter has the following functions:

■Conductivity limiters switch off the heating when the max.conductivity limit is exceeded

URB see page 112

LRGT16-3/LRGT17-3

The compact system LRGT 16-3/17-3 features 2 electrodes working acc.to the conductivitymeasurement principle.

LRGT 16-4

The compact system LRGT 16-4 features 4 electrodes working acc.to the conductivity measurement principle.

The LRGT16-x/17-3 is designed for signalling the TDS value (conductivity) in electrically conductive liquids:

■Conductivity permanently within predefined control range of the electrode.

The LRGT16-x/17-3 has a conductivity transmitter integrated in the terminal boxfor producing a standard signal 4-20 mA.

Sitop

Power supply unit Sitop PSU/Smart serves as a 2 4 \nu DC power supply unit for the compact system LRGT16-3/LRGT16-4/LRGT17-3.

Conductivity Monitoring SPECToRconnect/compact withAutomaticTemperatureCompensation

Type approval: TUv WUL xx-007
EG BAF-MUC-12-05-103881-003

TUV and EC type approval only in combination with LRR 1-5.

Conductivity Control withManual orAutomatic Temperature Compensation SPECTORmodule

GeSTRA

Manual Compensation

LRG 16-4

Application and Purpose

The LRG 16-4 in conjunction with conductivityswitch LRS or conductivitycontroller LRR detects the electrical conductivity of process or boilerwater.

Automatic Compensation

TRG 5-6.

Application and Purpose

The TRG 5-6.. continuously detects the temperature and compensates for any temperature influence on the conductivity reading.

LRG 16-9

Application and Purpose

The LRG 16-9 detects the electrical conductivityand,by means of the integrated resistance thermometer Pt 100,the temperature of feedwater, condensate,process and boiler water.

LRS 1-50

Application and Purpose

The LRS 1-50 is a compact-design limit switch for signaling MINand MAX limitsand for on/off continuous blowdown control (valve OPEN/CLOSED)with MAX limit contact for automatic boiler blowdown in steam boilers, evaporators,pure steam generators etc.A separate resistance thermometer Pt100 can be connected to the equipment to provide automatic temperature compensation.

LRR 1-50

Application and Purpose

The LRR 1-50 is a compact-design continuous blowdown controller forautomatic 3-position continuous blowdown control (valve OPEN/OPERATION/CLOSED)witha MAX limit contact for automatic boiler blowdown in steamboilers,evaporators,puresteam generatorsetc.A separate resistance thermometer Pt 100 can be connected to the equipment to provide automatic temperature compensation.

DesignofLRS1-50/LRR1-50/51

Plastic enclosure for installation in control cabinet, with removable terminal strip. Installation via 3 5 { \mathsf {mm } } standard rail.

LRR 1-52

Applicationand Purpose

The LRR 1-52 is a continuous blowdown controller forautomatic 3-position continuous blowdown Control (valve OPEN/OPERATION/ CLOSED) with MIN and MAX limit contacts for automatic boiler blowdown in steam boilers, evaporators,pure steam generators etc.The associated operating & display unit URB is mounted in the front panel and is used for setting the parameters in the controller and viewing numerical indicationand bar graphs of actual value,setpoint, value of manipulated variable and trend graphs.

Design

The continuous blowdown controller LRR isinsideaplastic enclosure for installation in control cabinet and provided with a removable terminal strip. Installation via35 mm standard rail.The operating& display unit URB is mounted in the front panel of the control cabinet.

Automatic temperature compensation

LRGT16-3/17-3

Application and Purpose

The compact system LRGT16-3/17-3 worksaccordingto the conductometric measuring method using two measuring electrodes and featuresan in-built resistance thermometer Pt1000.

LRGT 16-4

Application and Purpose

The compact system LRGT 16-4 works according to the conductometric measuring method using four measuring electrodes. Any effects caused bypolarisation or contamination are almost entirely compensated for. In addition,the equipment features an integrated resistance thermometer Pt1000.

Bothsystems LRGT1.-3andLRGT16-4 have an in-built conductivity transmitter that generates a standardized signal 4-20 mA.

LRR 1-51

Application and Purpose

The LRR 1-51 is a compact-design continuous blowdown controller forautomatic 3-position blowdown control (valve OPEN/ OPERATION/CLOSED)with MINand MAX limit contacts forautomatic boiler blowdown in steamboilers,evaporators,pure steam generators etc.The compact system LRGT 16-3/4 or LRGT17-3 provides automatic temperature compensation.

LRR 1-53

Applicationand Purpose

The LRR 1-53 is a continuous blowdown controller for automatic 3-position blowdown control (valve OPEN/OPERATION/CLOSED)with MIN andMAX limit contacts forautomatic boiler blowdown in steam boilers,evaporators,pure steam generators etc.The associated operating & display unit URB is mounted in the front panel and used for setting the parameters in the controller and viewing the numerical values and bar graphs of actual value,setpoint, value of manipulated variable and trend graphs.

Design

The continuous blowdown controller LRR is insidea plastic enclosure for installation in control cabinet and provided with a removable terminal strip. Installation via 3 5 { \mathsf {mm } } standard rail.The operating&display unit URB ismounted in the front panel of the control cabinet.

D GESTRA

Type approval: TUv WUL xx-017 EGZ-IS-TAF-MUC1208103881008

If an independent valve position indicator is required, please choose a BAE actuator with feedback potentiometer and add suffix-1to the type designation.

ConductivityMonitoringwithAutomatic Temperature CompensationLRG16-9/LRS1-7

DGeSTRA

Automatic Temp. Compensation

LRG 16-9

Purpose and Application

The LRG 16-9 in conjunction with LRS 1-7a monitors the electrical conductivity as well as the temperature of process, condensate,boilerand feedwaterthanks to the integrated resistance thermometer.The system is used for limit monitoring and/or automatic continuous boiler blowdown.

Design

The conductivity electrode LRG 16-9 works with2 electrodes and uses the electrical conductivityofwaterformeasurement.The integrated PT 10O measures the temperature, thereby enabling automatic temperature compensation.

LRS 1-7

Purpose and Application

Used in conjunction with conductivity electrode LRG16-9 forautomatically controlled continuous boiler blowdownand/or limit monitoring in orderto increase the economic viabilityand safety of the plant. Controlled boilerblowdownwith temperature compensated indication of the electrical conductivity (TDScontrol).Application in steam boilers, evaporators,steamregenerators,condensate liners etc.

Design

Plastic casing for wall mounting with indicators and adjustors behind clear lid.

Type approval: TUV WUL xx-014

Optional LRS 1-7a Special voltage 24 VAC

.51

Ancillaries:Tee Pieces,Level Potsand Portable Measuring Instruments

TeePieces for Conductivity Electrodes

Level Pots for Conductivity Electrodes

1)Approvalacc.toPED2014/68/EU module A2 2)Please state nominal size (DN) when ordering. ^ 3 ) Approved inacc.with PED2014/68/EU module6