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Laser gas analyzer

Chang Ai technology

Products‖Solution customization‖Technical support

INNOVATIVE TECHNOLOGY

BEST SERVE FOR YOU

INNOVATIVE TECHNOLOGY

BEST SERVE FOR YOU

Principle 0.7 0.8 0.9 1.0 1.0 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 14000 10000 8000 6000 5000 1

0.1

0.01

0.001

H2O

C2H2

C2H6*

H2O

H2O CO2 NH3* C2H4* NO H2S*

CH4

HCL

H2CO*

CO2

In nature, each gas absorbs light of a specific wavelength, when the light beam with specific wavelength that emitted by the spectrum

pass through the measuring tube, it is absorbed by the measured gas frequency-selectively, resulting the attenuation of the light intensity,

and the output light will be weakened or missing wavelength composition. In spectroscopy, the component of the substance can be distinguished through the absorption spectral line of gases. Therefore the system utilize the Beer-lamber relationship between characteristic of

absorption spectral line in gases composition and the infra-red/laser absorption spectrum, through checking the absorption rate from the

absorption spectral line(the rate of light attenuation), then the concentration of the sample gas can be obtained.

Strongest

absorption line

Oxygen absorption lines

750nm 1000nm 1250nm 1500nm 1750nm 2000nm 2250nm 2500nm

759 760 761 762 763 764 765 766 767

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

Gas absorption lines

Absorption rate[%,30cm]

HF HF CO2

H2O

H2S

CO2 CH4

C2H2

C2H6

NH3

HCL

N2O

H2S

N2O

NH3

CO2

NH3

Wavelength(nm)

Make the gas visible

Features

2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5

4000 3500 3 000

NH3 CO SO2 NO H2O C2H2 C2H4 HCL NO2

H2S N2O CO2 N2O NH3 CH4 H2 CO

N2O

CH4

C2H6

No cross interference

Using the laser wavelength corresponding to the

measured gas, it is not affected by the interference of

other gases, and it is easy to detect the specific components in the mixed gas;

Quick response

The response speed is about 1-5 seconds (high-speed

specification is about 1-2 seconds), compared with

other detection methods (electrochemical, semiconductor infrared, etc.), the response time is greatly

shortened;

High precision

Concentration monitoring is carried

out through the resonance absorption of specific wavelength by gas,

and the measurement accuracy is

extremely high;

Stability

Excellent long-term stability

±2%FS/ half a year (zero drift);

Low maintenance

No longer need cumbersome maintenance, easy to use and calibrate, does

not require professional operators;

Measurement method

Only laser irradiation during detection → suitable

for high temperature, strong corrosion and harsh

environment, dusty environment, and compatible with humid gas.

cm-1

μm

We are committed to providing professional solutions

and technical services for industrial customers

Features Technical Index

Technical Index

Specification

High performance single channel (through beam)

laser gas analyzer designed for a wide range of emisions

monitoring and process control. It is a high-perfomance

optical analyzer utilizing the latest tunable diode laser

(TDL) technology. Its response time is fast,generally less

than 2 seconds in in-situ measurement,which can eliminate the delay time of any sampling system.

CI-PC651/6500

Laser gas analyzer

A new generation of intelligent laser technology,

SIL2 safety certification;

Advanced EPC flow control technology saves nitrogen;

Fully automatic optical path protection system, not

only stable, but also more accurate;

Explosion-proof touch screen technology, not afraid

of raindrops and oil pollution;

The response to the control system is measured in

seconds;

Customized development for measurement process;

Only laser irradiation during detection → suitable for

high temperature, strong corrosion and dusty environments.

Performance index

Linear error:

Repeatability:

Range drift:

Response time:

Maintenance period:

Calibration period:

Analog signal

Quantity:

Analog output:

Allowable load:

Alarm output

Quantity:

Relay contact

capacity:

Communication

Quantity:

Communication mode:

Working environment

Ambient temperature:

Ambient humidity:

Mechanical information

Ex-mark:

Safety certification:

±2%FS

≤1%

±1%FS/half a year

T90<10s

≤2 times/year, clean the optical

lens

≤2 times/year

1 group

4-20mA

<500Ω

2 groups (1 group of concentration

alarm, 1 group of status alarm)

DC 24V,0.2 A

1 group

RS485(standard)/RS232(optional)

-20~+60℃

<90%RH

Exd IIC T6 Gb

SIL2

Weight:

Electrical information

Power supply:

Consumption:

Gas line connection:

Tracheal interface :

Transmitting unit + receiving unit +

calibration tooling: net weight about

13.5kg; Purge unit: net weight about

8.0kg

DC 24V(default)

AC 100~240V, 50/60Hz (optional)

<20VA

G1/4＂-Φ6 stainless steel pipe

connector (optional)

01 Note: 1. The table above indicates gas components and

their measure range, other gases can be customized according to user needs;

2. The specific measure range can be set according to user

needs;

3. Measuring gas temperature is optional from 0-1200°C,

and the conventional type is 0-400°C;

4. The concentration minimum/maximum range in the

table is when the measurement optical path length(flue/process pipe) is 1m.

Won the Made in China Beauty Silver Award

Gas components and measure range:

CO2

CO/CO2

CH4

C2H2

C2H4

C2H6

H2O

H2S

HCL

NH3

HCN

C2H4O

SO2

0~1.00%Vol.

0~8000ppm

0~10.00%Vol.

0~100ppm

0~1000ppm

0~5.00%Vol.

0~10ppm

0~100ppm

0~500ppm

0~100ppm

0~10ppm

0~500ppm

0~300ppm

0~50ppm

0~99.99%Vol.

0~2.00%Vol.

0~99.99%Vol.

0~50.00%Vol.

0~99.99%Vol.

0~1000ppm

0~40.00%Vol.

0~10000ppm

0~1000ppmVol.

0~10.00%Vol.

0~1.00%Vol.

0~10.00%Vol.

0~2000ppm

Selection

code Measuring range Measurement

lower limit Gas

Control Unit

Advanced EPC Purging Technology Receiving/Emitting Unit

The best purge flow rate ratio can be obtained to

achieve the best protection;

Digital closed-loop control, ultra-high control accuracy, repeatability and reliability, to ensure that the

optical system is not polluted;

Stepless pressure adjustment to provide stable purge gas pressure for the optical path system;

Not affected by the pressure fluctuation of the gas

source, an alarm command is issued when the purge

gas source is shut off or malfunction, the optical path

system is automatically closed at the same time.

The purging unit not only provides the purging gas

source for the transmitting unit and the receiving unit,

but also has data processing and control, which can display the measured gas concentration, modify the parameters of the analyzer, output analog signals, alarm

signals and communication signals, etc. .

Standard type

Enhanced

Features: When the purge air source is shut off or fails,

an alarm command is issued, and the receiving/emitting unit is automatically turned off at the same time,

which effectively protects the optical system from pollution, prolongs the service life of the receiing/emiting

unit, and reduces maintenance costs.

Features: When cleaning or other maintenance on the

receiving/emitting unit of the analyzer, the valve group

at the bottom of the flange can effectively isolate the

process pipeline and close the optical path system to

prevent dangerous gas leakage and contamination of

the optical path system, which may cause maintenance.

216

173

160

244

200

158

188

8.5

Display

Button

Chassis cover

Cable gland:

Power supply

Emitter unit

Input and output signals

Nameplate

Wall mount

Grounding Gas line interface: nitrogen High-purity (pneumatic valve) Power source Emitter unit Receiver unit

Signal output Signal input Power

Nitrogen

inlet

Bypass

outlet Sender Receiver

Purge unit

Emitter unit Receiver unit

Emit-receive cable

Pneumatic valve Purge gas Purge gas

Purge gas

intake Receive-purge unit cable

Process gas

Dust below 20g/m3

(N)

Process analyzers in the past:

sampling and testing process gases

Infrared analyzer (NDIR) /

magnetic oxygen o2

meter /

chromatography, etc.

Why In-situ Measurements Are Your First Choice

In-situ Installation

03 Rapid response: the response to the control system is

calculated in seconds;

On-site direct analysis of process gases;

Customized development for measurement process;

Provide true and representative measured gas concentration;

Simple structure, no moving parts, no loss parts→

maintenance-free;

Only laser irradiation during detection → suitable for

high temperature, strong corrosion, and dusty environments.

Sampling delay: control reaction to monitoring in

minutes (long lag);

The system is complex and the failure rate is high;

Require frequent calibration;

Complex structure, consumables → probe corrosion,

blockage → need maintenance;

Sampling causes process gas composition to vary →

not true process state (with error).

Launch unit

Detector unit

Laser beam

Process gas

φ500mm pipe

φ20~50mm variable

diameter tube

Minimum optical path 500mm

Pipe restrictions

φ34mm pipe

φ20~34mm variable

diameter tube

Minimum optical path 500mm

Furnace combustion

optimization

high temperature 1400°C

Cyclohexanone

ammoximation

(petrochemical)

Pharmaceutical

intermediates

Chloromethane process CDQ engineering

Minimum optical path 500mm

Process gas Sampling first and then testing

Tunable diode lasers are gaining popularity in

chemical, petrochemical, and refining industries. Its

high reliability and low maintenance requirements

make it the gas analysis technology of choice for users,

and it is a non-contact optical measurement method

using a solid-state laser light source. As a result, the light

source is immune to pollutants and corrosive gases, requiring no routine maintenance.

CI-PC68/-1

Reflective laser

Sampling gas measurement systems often play an important role in ensuring process safety and inert effect

at every moment. Therefore, they must be able to withstand the most demanding environments, condensed

water, dust, corrosive gases, vibrations, etc..In safety

monitoring, the reliability of the analyzer is of paramount importance. In order to maintain its performance at the best level, the weakest part in sampling

analysis must be overcome while reducing maintenance effort.

Advantage Advantage

Sampling Type TDL Inline Type (In-situ TDL)

Run without purge

Has a diagnostic

output for preventive

maintenance.

Heated optical

surfaces prevent

condensation;

Low maintenance;

Resistant to corrosive

chemical gases:

resistant to extreme

humidity and even

liquid water;

Fast response time (<1s),

improve safety;

Online

maintenance

when necessary;

No nitrogen back-flush

is required, so the

operating cost is very

low;

The in-line

installation method

does not require a

pretreatment

device, and

real-time rapid

measurement;

Easy-to-use and

compact design,

minimum and

utilization of

space;

Can be used in harsh

industrial environments,

resistant to chemical

corrosion, high dust, high

moisture;

Sampling installation

minimizes handling

requirements of

sample gas.

Response Maintenance

Prevent

ne mnori v

t Measurement

Advantage

Prevent Measurement nI s at l

vnE ori mn ent Design Blowback

Advantage

In-situ TDL are usually designed with a double-sided

mount, but this cannot be ruled out. Inline TDL can effectively overcome the difficulties in installation. The

probe is the part of the laser that inserted into the process gas. For inline TDL the diode laser and detector are

located on the same side of the pipe. The emitted laser

beam is reflected back to the detector by the mirror,

thus realizing the work without optical path.

Intake air

(from process unit)

Outlet

(return to process unit)

Has a diagnostic

output for preventive

maintenance;

05 Specification

Measuring components and measuring range

Technical Index

Performance index

Linear error:

Zero drift:

Range drift:

Resolution:

Pressure drift without

pressure compensation:

Pressure compensation

accuracy:

Background gas

compensation accuracy:

Analog signal

Analog signal:

Analog output mode:

Allowable load:

±1%FS

±0.1%/year

±1%FS/half a year

0.1%

0.8~1.2bar -2% reading

1.2~1.4bar -5% reading

±0.25% of reading

0~300g/m3water content

（Td=80℃）

±1% of reading

1 way

4-20mA/0-20mA/0-1V/0-5V/0

-10V/1-5V

Output mode supports

software switching< 500Ω

Alarm output

Alarm point:

Relay contact capacity:

Communication

Communication:

Working environment

Working temperature:

Storage temperature:

Working pressure:

Probe pressure:

Ambient humidity:

Mechanical data

Protection level:

Ex-mark:

Safety certificate:

Electrical enclosure:

Probe material:

Weight:

Electrical data

Power supply:

Consumption:

Connection

Cable connector:

Tracheal interface:

DC 24V, 0.2 A

RS485(standard)/RS232

(optional)

Electrical enclosure:-20~+50℃

Probe:-20~+80℃

-20~+60℃

0.8~1.4 bar

Up to 5 bar

< 90%RH

IP65

Ex d ⅡC T6 Gb

SIL2

Aluminum alloy material

316L stainless steel

Sampling type:<7kg

Flange:<5kg

Diffuse type:<4kg

DC 24V, ≥0.5A

<10VA

1 cable gland

G1/4\"-Φ6 stainless steel pipe

joint (optional)

The parts in the figure are numbered as follows:

① - Fix the two C-brackets inside the L-bracket;

② - Fix the L bracket on the wall or metal plate;

③ - Loosen the bolts at the opening of the C-shaped bracket;

④ - Put the sampling chamber into the \"C position\" of the C-shaped bracket, so that the bottom of the sampling chamber touches the vertical surface of the

L-shaped bracket;

⑤ - Ti-ghten the bolts and the C-bracket clamps the sampling chamber;

The installation direction of the wall mount can be rotated 90° for installation.

Installation Example

Installation with sampling chamber

Note: 1. The above are part of the measured gas

indicators, and other gases can be customized

according to user needs;

2. The specific range can be set according to the

needs of users.

gas Measuring range Selection code Measurement

lower limit 气体

CO2

CO/CO2

CH4

C2H2

C2H4

C2H6

H2O

H2S

HCL

NH3

HCN

C2H4O

测量下限

0.1%

0.05%

0.1%

0.01%

0.1%

0.01%

0.1%

0.01%

0.1%

0.01%

0.1%

0.01%

0.1%

1.0%

0.005%

0.1%

1.0%

0.01%

0.1%

测量范围

0~99.9%Vol.

0~2.00%Vol.

0~99.9%Vol.

0~1.00%Vol.

0~99.9%Vol.

0~1.00%Vol.

0~10.00%Vol.

0~50.0%Vol.

0~1.00%Vol.

0~50.0%Vol.

0~1.00%Vol.

0~50.0%Vol.

0~1.00%Vol.

0~50.0%Vol.

0~99.9%Vol.

0~1.000%Vol.

0~40.0%Vol.

0~99.9%Vol.

0~1.00%Vol.

0~10.00%Vol.

0~5.0%Vol.

0~10.0%Vol.

选型代码

Gas Measurement

lower limit Measuring range Selection

code

No need to focus;

Reduce installation costs and facilitate commissioning;

Innovative filter design, no purge gas required;

Stable measurement is achieved even in high dust

environments.

Installation Example

Laser Source And Detector Combined

Into One

Dimensions

Product Cases

Sampling type CI-PC68-1 dimension drawing

Diffusion type CI-PC68-1 dimension drawing

Inline CI-PC68-1 dimension drawing

The parts in the figure are numbered as follows:

① - Weld the inline kit on the inline device;

② - Insert the measuring probe into the inline kit;

③ - Fix the flanges with clamps, and seal rings must be

placed between the flanges.

In the figure: ①- is the valve;

②- is an inline kit;

③- is the valve on the main pipe of the

process pipeline.

Note: The flange used for inline installation is Chang

Ai's special flange;

The diffusion installation method needs to be customized by the user, so please contact our technical engineers when ordering.

Inline install

Bypass installation

①

CI-PC68-1

Gas to be measured

②

Bypass

③

detection point inner

diameter ≥ 50mm

Process piping

Hydrogenation reactor

process

Chemical process Chemical caustic

soda process

Hydrogenation reaction

process

Chemical hydrofluoric

acid process

Gas

Applications of laser analyzers

07 Application

Coal injection process application Induced fan

Bag dust

collector

Blast furnace

Conveyor Coal pulverized machine

Fine powder separator

Coarse

powder

separator

Pulverized

coal bunker

Raw coal bunker

Heated dry gas

Typical Application Typical Application

Industry Industry

process

Application

fields

Gas

measurement

Chlor-alkali/

PVC

Hydrogen

peroxide

(H2O2)

Sulfur acid

production

TDI

Trace water in CL2

Trace water in EDC

Recycle syngas

Oxychlorination

process

VCM exhaust

gas recovery

Oxidation

process

Oxidation

process

Water gas

H2O

O2、CO2、

C2H4, etc.

O2、CO2、

C2H4, etc.

Smoke

emission

Waste incineration

flue gas analysis

HCL、HF、

CO、CO2、O2

Flue gas

denitrification

process control

NH3、NO、NO2

Combustion

process control

O2、CO、

CO2

Cement

production

Combustion process

control of Rotary kiln

inlet and outlet

O2、CO、

CO2

Safety monitoring of

coal injection (mill,

pulverized coal

chamber)

O2、CO

Combustion control

of preheater and

cyclone heater

O2、CO、

CO2

Cement

Power

Coal-fired

power

generation

Combustion

control O2、CO

O2、CO

Coal injection (mill,

pulverized coal

chamber) safety

monitoring

Industry Industry

process

Application

fields

Gas

measurement

Metallurgy

Blast furnace

ironmaking

Converter

furnace

steelmaking

Coking

production

Other

Petroluem

refinery

Ethylene

cracking

EO/EG

Ethylbenzene/

styrene

monomer/PS

PTA

Coal gas

production

Methanol/

synthetic

ammonia/

urea

Blast furnace

gas analysis

Safety management

for pulverized coal

injection of blast

furnace

Flue gas analysis

of hot blast stove

Converter gas

recovery

Converter gas

safety control

Converter flue

gas carbon

determination

Electric detarring

precipitator safety

control

Coke dry

quenching (CDQ)

cycle gas analysis

Coke oven gas

analysis

Calorific value

analysis of gas

Boiler flue gas

analysis

Fluid catalytic

cracking (FCC)

regeneration flue

gas analysis

Hydrogen

production

from alkanes

Sulfur

recovery

Reactor outlet, etc.

Process gas

Process

components

Oxidation

reactor control

Ammonia-to-carbon

ratio of urea

synthesis

benzene in

trace water

CO、CO2、

O2、CH4

O2、CO

CO、CO2、

H2S、NH3

CO、CH4

CO、O2

CO、CO2、

CH4

CO、CO2, etc.

O2、C2H4, etc.

CO、CO2、O2

O2、CO、

CO2、NH3, etc.

NH3、CO2

O2,CO/CO2,

Petrochemical

Environmental

Protection

Application Application

Converter process application

Chlor-alkali process application

First-stage Venturi dust collector

Secondary Venturi

dust collector

Converter furnace

Induced draft fan

Diffusion tower

Three-way valve

Water seal

valve

Gas holder

Electrostatic

precipitator

Net gas

Blast furnace process application

Energy recovery

of blast furnace

off-gas

Baghouse

filter

dedusting

Gravitational

dust

collecting

Bellless stove

top

Mixed

gas

Hot air

Humidity control

system

Cold air

Hot-blast stove

Exhaust

Chimney

Blower

Batching room

Main conveyor belt

Tuyere

Taphole

Blast furnace

Torpedo car

Crude salt

Salt Primary

brine

Secondary

brine

Saline

deoxygenation

Hydrogen

treatment

Chlorine

treatment

Liquid

chlorine

packaging

Caustic

soda

Mixing

dehydration

Preheating

Acetylene

gas

holder

Acetylene

occurs

Acetylene

cleaning

Dehydration Stripping

VCM gas holder

exhaust

PVC

polymerization Distillation Vinyl chloride

conversion

Hydrogen

chloride

synthesis

Electrolysis

Serial

number Monitoring

points

Gas composition

measurement

Monitoring

purpose

Coal mill

entrance CO、O2

Safety monitoring,

explosion prevention 1

Coal mill

exit

Pulverized

coal bunker

Outlet of bag

house filter

CO、O2

Safety monitoring,

explosion prevention

Safety monitoring,

explosion prevention

Safety monitoring,

explosion prevention

Serial

number

Monitoring

points

Gas composition

measurement

Monitoring

purpose

Outlet of bag

house filter

Hot air

main

Exhaust gas

from hot

blast stove

Discharge

chimney

CO、CO2、O2、 H2、CH4

CO、O2

NOx、SO2

Safety monitoring,

combustion control 1

Combustion

conditions monitoring, regulating of

devices, production

optimization

Combustion

efficiency control

On-line monitoring

of exhaust

emissions

Before the

gas holder

After the

gas holder

CO、O2

Steelmaking

controls, regulating

of devices, production optimization

Safely control

After the

second stage

Venturi

dedusting

Serial

number

Monitoring

points

Gas composition

measurement

Monitoring

purpose

Before/after

the induced

draft fan

CO、O2

Safety monitoring,

gas recovery

Serial

number

Monitoring

points

Gas composition

measurement

Monitoring

purpose

HCl

main line

Exit of VCM

synthesis

furnace

VCM

main pipe

HCl、Cl2

HCl、C2H2

H2O

1 Safely control

Process control to

improve production

efficiency

Process control to

improve production

efficiency

Process control to

protect the chlorine

press

Safely control

Entrance of

VCM

synthesis

furnace

After

chlorine

press

Shanghai Chang Ai Technology & Development Co.,Ltd(headquarters)

Address: No. 97, Building 11, Vanke Qibao International Center, Lane 1333, XinIong Road, Minhang

District,Shanghai, P.R. China

Tel: +86 021 51692285

E-mail: info@ci-ele.com

For more information, please visit www.ci-ele.com

The edition of this volume is CI.1.23.The information is for reference only.It is subject to change without notice

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