PRODUCTMANUALZHEJJIANG WEIDUINSTRUMENTCO.,LTD

Corporate mission:

Weidu, wisdom to maintain a

better life!

Corporate vision:

Strive to become a leading

technology enterprise that is

respected and continues to create

value. Management idea:

To high standards of products and

services, to customer satisfaction. With advanced technology and

Management, let the enterprise

sustainable development.

CONTENTSWT SERIES GAS TURBINE FLOWMETER 1-5WR SERIES GAS ROOTS FLOWMETER 6-11WU SERIES GAS ULTRASONIC FLOWMETER12-17VDQ SERIES INTELLIGENT IC CARD CONTROLLER18-21IC CARD SERIES GAS FLOWMETER 22-29GAS FILTER 30-33WEM VOLUME CORRECTION INSTRUMENT 34-36WEIDU CLOUD IOT 37-39CORPORATE PRESENCE 40-40

Qualifications

Qualifications

Integrity/Focus

Innovation/Win-win

WEIDU

ABOUTWEIDUZhejiang Weidu Instrument Co., Ltd. was established in 2017witharegistered capital of 50 million yuan. It is a high-tech enterprisespecializing in the production of gas metering instruments withprofessional skills, advanced technology, high-quality productsandhonest services. The company has gathered a group of richindustryexperience and professional technology, involving mechanical designandmanufacturing, electronic application technology, informationandcommunication engineering, electrical automation and computerapplication professional team core talents. With a large flowof sonicnozzle gas flow standard device, three coordinate precisiontestingequipment, intelligent instrument assembly line, high-precisionCNCmachining center and other advanced equipment, has been built researchand development, production, sales, service in one of the innovativecompany.

The company's main products are: WT series gas turbine flowmeter, WRseriesgas Roots flowmeter, IC card industry gas flowmeter, VDQseries intelligent ICcard flow controller, WEM type volume correction instrument and other products.A number of product technologies are at the advanced level of the domesticindustry, and it has a number of independent intellectual propertyrightstodevelop and implement new types of expertise. The enterprise has passedtheISO9001: Quality Management System Certification, ISO14001: EnvironmentalManagement System Certification, ISO145001: 2018 Occupational HealthandSafety Management System Certification. Products are widely used inurbangas,petroleum, petrochemical, light industry, metallurgy, electric power, coal andsoon Industry. In the digital era of the Internet of everything, we will uphold our long-termcommitment to customer demand-oriented technology innovation, productmanufacturing and customer satisfaction. We will followthe key directionofintelligent manufacturing in the future, and gradually evolve along the directionofdigitalization, automation, visualization, networking and intelligence. The future has come, wisdom leads. Weidu, wisdom to maintain a better life!

WT SERIES GAS TURBINE FLOWMETEROverview

WT series gas turbine flowmeter is a kind of precision measuring instrument with highprecisionand high reliability. It is suitable for the measurement of all kinds of single-phase gas, appliedtothe measurement of gas in urban gas, petroleum, chemical, electric power, metallurgyandotherindustries. WT series gas turbine flowmeters have excellent low and high pressure metering performance, suitable for the accurate measurement of large flow gas. According to the needs of users, wecanprovide different precision levels, different performance of turbine flowmeters. Main feature

● High precision, good repeatability, wide range ratio (up to 1:20). ● Using integrated rectifier, the front and rear straight pipe section requirementsarelower (front ≥ 2DN, rear ≥ 1DN). ● The volume correction instrument of the flowmeter can be freely rotated about 360°, which can be easily read in various installation modes. ● Low speed, high life, low pressure loss, high precision. ● High precision digital temperature sensor and digital pressure sensor, andthedigital pressure sensor with temperature compensation correction function, highpressure detection accuracy, good long-term stability, small temperature drift. ● It can automatically detect the temperature and pressure value of the medium, andmodify the temperature, pressure and compression factor, and convert the volumeflow and total volume flow under the working condition to the standard state. 01

● Using advanced micro-power high and new technology, low power consumption, longterm power supply with internal battery. ●Using large capacity data memory, with data tamper-proof function, automatically record key data modification and historical data. ●With real-time data storage function to prevent data loss during battery replacement

or power failure, internal parameters can be permanently saved in case of powerfailure. ● It can be embedded with wireless modules such as 4G or NB, and can be composedof various forms of wireless meter reading system, which is powered by the built-inbattery to achieve wireless transmission of limited times (once a day), noexternal

power supply, easy to use. Or by external power supply to achieve unlimitednumberof data transmission. Working principle

When the fluid passes the flowmeter, it is rectified and accelerated under the actionofthe leading fluid (or rectifier). As the flow direction of the blade and the fluidis at acertain Angle, the turbine generates rotational torque. After overcoming the frictiontorque and the fluid resistance moment, the turbine starts to rotate. In a certainflowrange, the angular velocity of turbine rotation is approximately proportional tothevolume flow of fluid. ★ Drive the mechanical counter through the mechanical structure. ★ According to the principle of electromagnetic induction, the magnetic sensor is usedto induce a pulse signal proportional to the volume flow rate of the fluid fromthesynchronous rotation of the signal plate, and the signal is sent to the volumecorrection instrument, and the temperature, pressure and other signals are processedtogether, respectively displayed on the display screen. Its structure is showninFIG.1. 1. Volume corrector

2. Meter housing

3. Oil pump

4. Turbine

5. Pilot fluid

FIG.1 Structure diagram of gas turbine flowmeter

02

Technical performance index

a. In its specified flow range and working conditions, the accuracy level of the flowmeteris 1.0 and 1.5:

Level 1.0: 0.2Qmax～Qmax

: ±1.0%; Qmin～0.2Qmax

: ±2.0%

Level 1.5: 0.2Qmax～Qmax

: ±1.5%; Qmin～0.2Qmax

: ±3.0%

b. Temperature indication error: ≤±0.5℃

c. Pressure indication error: ≤±0.2%

★ Mechanical performance index

★ Flowmeter model specifications and basic parameters are shown in Table 1.

① The flow range listed in the table is the flow range of the product when it is verifiedbythe factory (the medium is air at normal temperature and normal pressure). ② As the pressure increases, the flow range also expands.

Nominal

diameter

（DN）mm

Type

specification

Flow range

(m3

/h)

Impeller

material

Pressure

(Mpa) Remark50(2\")

WT50A 6～65

Aluminiu

m alloy

1.6

2.5

4.0

6.3

Housing material:

≤1.6MPa is die-cast

aluminumalloy>1.6MPa is carbonsteel or stainless steel

WT50B 10～100

WT50C 10～160

80(3\")

WT80A 8～160

WT80B 13～250

WT80C 20～400

100(4\")

WT100A 13～250

WT100B 20～400

WT100C 32～650

150(6\")

WT150A 32～650

WT150B 50～1000

WT150C 80～1600

200(8\")

WT200A 50～1000

WT200B 80～1600

WT200C 130～2500

250(10\")

WT250A 80～1600

Housing material:

carbon steel or

stainless steel

WT250B 130～2500

WT250C 200～4000

300(12\")

WT300A 130～2500

WT300B 200～4000

WT300C 320～6500

Table103

Overall dimensions and installation

The dimensions of the flowmeter are shown in the figure below, and the dimensions are listedinTable 2. The flowmeter adopts a flange connection mode, and the size of the flowmeter complieswith GB/T9119-2010.

Dimensions of WTM type

Dimensions of WTD type

Dimensions of WTE type

04

Diameter

A

Two

flange

distance

Width Height D

Flange

outside

diameter

K

Bolt

center

distance

Bolt hole

position

dSealingB B1 H H1 H2 n Lsurface50 150 215 225 317 230 380 165 125 4 18 10280 240 232 242 350 260 410 200 160 8 18 138100 300 252 262 370 280 430 220 180 8 18 158150 450 312 322 428 338 488 285 240 8 22 212200 600 381 397 496 407 557 340 295 12 22 268250 375 445 455 559 469 619 405 355 12 26 320300 450 490 500 605 515 665 460 410 12 26 378Order instructions

instructions

★ When ordering this product, the user should select the appropriate specificationsaccording to the nominal pressure of the pipeline, the maximumpressure of themedium, the temperature of the medium, the flow range, and the environmental

conditions, and select the appropriate electronic instrument head accordingtotheactual needs. ★ Please fill in the following form correctly when ordering.

Unit: mm Table205

WR SERIES GAS ROOTS FLOWMETEROverview

WR series gas Roots flowmeter is a kind of positive displacement measuring instrument withhigh precision, strong reliability and wide range, which is mainly used for accurate measurementof gas flow in closed pipelines. The flowmeter can automatically track and compensatethepressure and temperature of the measured gas, and directly display the total volume of thegasunder the standard state. It can be used to measure natural gas, city gas, propane, air, nitrogen, carbondioxide, industrial inert gas and other non-corrosive gases. Widely used in catering, hotelsandother industries of gas commercial settlement, transmission and distributionnetworkgas, gas pressure regulation, industrial and civil boiler gas metering. Key feature

● Wide flow range (>100:1), low starting flow, small pressure loss, suitable for largeflow load change occasions. ● High measurement accuracy, strong reliability, not affected by pressure andflowchanges. 06

● High precision machining and repeated positioning technology, so that thepartshave good versatility and interchangeability, so that the flowmeter has goodrepeatability, long working life. ● The flowmeter does not require a straight pipe section and can be installed ina narrowspace. ● High precision digital temperature sensor and digital pressure sensor, andthedigital pressure sensor with temperature compensation correction function, highpressure detection accuracy, good long-term stability, small temperature drift. ● It can automatically detect the temperature and pressure value of the medium, andmodify the temperature, pressure and compression factor, and convert the volumeflow and total volume flow under the working condition to the standard state. ● Using advanced micro-power high technology, low power consumption, long-termpower supply with internal battery. ● Using large capacity data memory, with data tamper-proof function, automaticallyrecord key data modification and historical data. ● With real-time data storage function to prevent data loss during battery replacement

or power failure, internal parameters can be permanently saved in case of powerfailure. ● It can be embedded with wireless modules such as 4G or NB, and can be composedofvarious forms of wireless meter reading system, which is powered by the built-inbattery to achieve wireless transmission of limited times (once a day), noexternal

power supply, easy to use. Or by external power supply to achieve unlimitednumberof data transmission. Working principle

Gas Roots flowmeter is a kind of high precision volumetric flowmeasuringinstrument. A fixed measuring chamber is mainly composed of a housing, twoRootswheels and a cover plate. When the gas enters the flowmeter, there is a pressuredifference between the inlet and outlet (Pin>Pout), acting on the Roots wheel, drivenby two high precision machining synchronous gears (connected to the Roots wheel), the Roots wheel always maintains a correct relative position to rotate. The constant

gap between the Roots wheel, between the Roots wheel and the housing, andbetweenthe Roots wheel and the cover plate is maintained to realize continuous contactlessrotation. For each revolution of the Roots wheel, four times the gas of the meteringchamber is discharged (a rotating volume), and the number of revolutions of theRoots wheel is proportional to the volume of gas passing through the flowmeter.

07

★ Drive the mechanical counter through the mechanical structure. ★ According to the principle of electromagnetic induction, the magnetic sensor is usedtoinducea pulse signal proportional to the volume flow rate of the fluid from the synchronous rotationof the signal plate. The signal is sent to the volume correction instrument, and the temperature, pressure and other signals are processed together, and are separately displayed on the displayscreen. The working principle of its measurement process is shown in FIG.2 (only a quarter periodisrepresented in the figure). The structure of Roots flowmeter is shown in FIG.3.

FIG.2 Working principle diagram1. Volume corrector

2. Bearing seat

3. Roots wheel

4. Synchronous gear

5. Signal plate

6. Housing7. Oil fillingport8. Oil window9. Oil drainportFIG.3 Structure diagram of gas Roots flowmeter

08

Technical performance index

a. The accuracy of the flowmeter is class 1.0 and class 1.5 within its specified flowrangeandunder operating conditions:

Level 1.0: 0.2Qmax～Qmax: ±1.0%; Qmin～0.2Qmax: ±2.0%

Level 1.5: 0.2Qmax～Qmax: ±1.5%; Qmin～0.2Qmax: ±3.0%

b. Temperature indication error: ≤±0.5℃

c. Pressure indication error: ≤±0.2%

★ Mechanical performance indicators: flowmeter model specifications, basic parameters seethefollowing table

Table3Nominal

diameter

Flow

specification

Flow range

(m3

/h)

Nominal

pressure

(MPa)

Accuracy

level

Starting

flow

(m3

/h)

Maximumpressure loss

(kPa)

Rangeability20(0.8\") G6 0.2～10

1.6 Level 1.0

or 1.5

0.04 0.15 50:125(1\") G10 0.4～16 0.06 0.20 40:1G16 0.4～25 0.06 0.25 65:140(1.5\")

G16 0.5～25 0.07 0.10 50:1G25 0.5～40 0.07 0.10 80:1G40 0.5～65 0.07 0.25 130:150(2\")

G16 0.5～25 0.07 0.10 50:1G25 0.5～40 0.07 0.10 80:1G40 0.5～65 0.07 0.25 130:1G65 0.5～100 0.07 0.35 200:180(3\") G100 0.8～160 0.10 0.35 200:1G160 1.6～250 0.15 0.40 160:1100(4\")

G160 1.6～250 0.15 0.35 160:1G250 2.0～400 0.30 0.40 200:1G400 4.0～650 0.60 0.70 160:1150(6\") G400 4.0～650 0.70 0.60 160:1G650 6.5～1000 0.70 0.80 160:1200(8\") G1000 10～1600 1.20 0.70 160:109

Overall dimensions and installation

The dimensions of the flowmeter are shown in the figure below. The dimensions are listedinTable 4. The flowmeter adopts a flange connection mode, and the size of the flowmeter complieswith GB/T9119-2010 standard.

Dimensions of WRZ

Dimensions of WRD

Dimensions of WRM

10

Table4Nominal

diameter

(DN)/mm

Flow

specification

L L1

H B

WRZ B1 K n-d Remark/WRD WRM WRZ WRM

/WRD

20(0.8\") G6 130 255 286 156 45 75 4×M12 M12×3525(1\") G10 130 254 305 137 198 247 55 85 4×M12 M12×35G16 130 254 305 137 198 247 55 85 4×M12 M12×3540(1.5\")

G16 172 246 344 172 246 288 79 110 4×M16 M16×50G25 172 246 344 172 246 288 79 110 4×M16 M16×50G40 172 246 344 172 246 288 79 110 4×M16 M16×5050(2\")

G16 172 246 344 172 246 288 79 125 4×M16 M16×50G25 172 246 344 172 246 288 79 125 4×M16 M16×50G40 172 246 344 172 246 288 79 125 4×M16 M16×50G65 172 246 344 172 246 288 79 125 4×M16 M16×5080(3\") G100 172 246 351 172 298 343 100 160 8×M16 M16×50G160 241 281 434 261 346 390 120 160 8×M16 M16×50100(4\")

G160 241 281 434 261 346 390 120 180 8×M16 M16×50G250 241 281 434 261 446 490 181 180 8×M16 M16×50G400 241 281 443 271 585 625 280 180 8×M16 M16×50150(6\") G400 241 281 443 271 585 625 280 240 8×M20 M20×60G650 241 281 443 271 685 725 330 240 8×M20 M20×60200(8\") G1000 460 450 570 450 998 998 400 295 12×M20 M20×60Order instructions

in★stBreufcotrieoonrsdering products, please read this manual carefully, should be basedonthepipeline nominal diameter, nominal pressure, flow range, mediummaximumpressure, medium temperature range and environmental conditions to select theappropriate specifications. ★ The front end of the flowmeter is strongly recommended to install a filter, theflowmeter and filter can be ordered. ★ Please fill in the code form correctly when ordering. WR series gas Rootsflowmeter code table is as follows:

11

WU SERIES GAS ULTRASONIC FLOWMETEROverview

WU series gas ultrasonic flowmeter is a new flowmeter based

on ultrasonic time difference method to measure the flow rate. It

adopts four-channel design, which can effectively reduce the

influence of eddy current and asymmetric flow, and improve the

measurement accuracy and reliability. The product integrates

flow measurement and volume correction, and can directly

measure the volume flow, temperature, pressure, volume flow

and total amount under gas measurement conditions (referred to

as \"working conditions\"). According to needs, it can also add

the Internet of Things communication and system platform

prepaid settlement function, which is an ideal instrument for

urban gas trade measurement and industrial gas measurement in

petrochemical, metallurgy, electric power and other industries. Key feature

● Two-to-three-section four-channel layout, with eddy current and asymmetricflowdetection and compensation functions. ● With a variety of self-diagnosis and self-correction functions. ● Independent metering core structure design, easy to maintain and improve product

reliability and service life. ● Wide range, ≥ 100:1 (DN25 ~ DN40) and 160:1 (DN50 ~ DN200). ● The starting flow rate is low, and the lower limit of the measurable flowrateisnot

more than 15mm/s. ● With zero self-tracking function, can effectively eliminate zero drift. ● Four-channel redundant design, part of the channel fault can ensure thebasicaccuracy of measurement, high reliability. ● Straight through measuring tube design, zero pressure loss. 12

● UART communication mode is adopted between the volume correction instrument

and the ultrasonic base instrument to ensure that the data of the base instrument

and the correction instrument are completely synchronized, and the mainstatediagnosis information of the base instrument can be collected and the alarmcanbe displayed. ● Volume correction instrument adopts full digital design, high conversion accuracy, and has perfect data management ability. ● The Internet of Things communication module and correction instrument adopt aunique structural design, and the Internet of Things module design is standardized, 2G, 4G, NB can be directly interchangeable upgrade. ● Adopt a variety of electromagnetic compatibility design technology, strongantiinterference ability. Structure and principle

The flowmeter is mainly composed of a housing, a metering core assembly, anultrasonic metering plate assembly, a support and a volume correction instrument, asshown in the structure diagram in FIG.4.

FIG.4 Structure diagram of DN50

The main functions of each part are as follows:

(1) Housing: bearing and installing metering core assembly. (2) Metering core component: install transducer, ensure sound channel size stability, provide measurement pipeline. (3) Ultrasonic measuring plate component: ultrasonic excitation and signal

processing, gas flow rate detection and flow calculation, informationandcorrection instrument exchange. (4) Bracket: the metering plate assembly is provided to mount the chamber andsupport the corrector. (5) Volume corrector: read the ultrasonic metering board detection data, convert

the working flow and volume to the standard flow and volume, and achieveother additional functions. 13

The four-channel design can detect eddy current and asymmetric flowand reduceitsinfluence. It has the characteristics of good anti-noise performance and accuratemeasurement. At the same time, part of the channel detection failure can still worknormally, which can improve the reliability of measurement. Mean velocity:

In the formula: vi and wi are the flow rate and weight coefficient of the i channel. i=1, 4.

FIG.5 Schematic diagram of channel structure

Type specification

Type

specification

Nominal

diameter (DN)

mm

Flow range

m³/h

Starting flow

m³/h

Mediummaximumpressure(MPa.a)

/Nominal pressure(MPa.g)WU-G25 25 0.4～40 0.10

1.6/1.6

WU-G40 32 0.6～65 0.12

WU-G65 40 1.0～100 0.14

WU-G100 50 1.0～160 0.20

WU-G250 80 2.5～400 0.40

WU-G400 100 4.0～650 0.65

WU-G1000 150 10～1600 1.60

WU-G1600 200 16～2500 2.0

WU-G2500 250 40～4000 5.0

Note: The minimum operating pressure of WU-G2500 shall not be less than or equal to0.5MPa.

Table514

Technical parameter

Serial

number

Designation Technical parameter

1 Conditions of

use

Ambient temperature : -25℃～+55℃. Medium temperature : -20℃～+60℃. Relative humidity : 5%～95%. Atmospheric pressure : 70 kPa～106 kPa. Mechanical vibration: there should be no strong mechanical vibrationoccasions. Electromagnetic and electronic interference:

there is no strong electromagnetic and electronic interference environment. Acoustic interference: ambient acoustic noise has no adverse effect onitsmeasurement performance. Pulsating flow: does not affect its metering performance. Measuring media: natural gas, compressed air, nitrogen and industrial inert

gases. 2 Accuracy class Level 1.0

3 Operating

power supply

Metering battery: a set of 3.6Vdc lithium battery pack. Internet of Things module communication battery: a set of 3.6Vdc lithiumbatteries. External power supply 1: 8～28Vdc, pulse output, RS485 output, 4～20mA current output, power consumption ≤1W. External power supply 2: 5Vdc dedicated safe power supply, power

consumption ≤1W, for Internet of Things communication (built-in securitygrid, can not be replaced with other external power supply). 4 Output signal

Working condition pulse signal. Equivalent pulse signal. RS485 output signal. Two-wire 4-20mA current output. 5

Self-diagnosis

and alarm

output

Self-diagnosis content:

Gain exceeds the upper limit [>67db (G25～G100), >72db (G250/G400), 75db (G1000 and above)], signal amplitude exceeds the limit, soundchannel detection failure, effective measurement percentage, measurement

parameter modification, temperature and pressure sensor failure, mainbattery undervoltage, correction instrument turned on, etc. 6 Data recording

and query

Historical data records: 4320 hourly records, 600 daily records, 1000interval records, 1000 start-stop records. The record contents include: date and time, temperature, pressure, workingcondition and standard condition flow, total working condition andstandard condition, conversion coefficient, status word and alarmword. Historical data records can be queried through external power supplyRS485 or Bluetooth communication. 7

Internet of

things

communication

The Internet of Things module adopts standardized design, 2G, 4G, NBoptional, and can be directly upgraded and exchanged. 8 Explosion- proof level Ex ib IIB T4 Gb

9 Protection level IP65

Table615

Dimensions, installation and verification precautions

FIG.6 Outline diagram

Size type D1 D2 n×M L HDN25 115 85 4×M12 150 300DN32 140 100 4×M16 150 300DN40 150 110 4×M16 150 310DN50 165 125 4×M16 150 310DN80 200 160 8×M16 240 330DN100 220 180 8×M16 300 360DN150 280 240 8×M20 450 380DN200 340 295 12×M20 600 400DN250 405 355 12×M24 375 435Note: 'L' length can be customized.

Outline and mounting dimensions table Table716

Order instructions

1. When ordering this product, the user should correctly provide the nominal diameter, nominalpressure, the maximum pressure of the medium;

2. When ordering, the correct functional configuration should be selected accordingtothefunctional requirements and filled in correctly in the following format.

17

VDQ SERIES INTELLIGENT IC CARDCONTROLLERVDQ-A intelligent IC card controller VDQ-B intelligent IC card controllerOverview

Internet of Things IC card controller (hereinafter referred to as \"controller\") is a newtypeof gasflowmeter suitable for supporting various types of Roots, turbine and other series, to achieveICcard gas sales management. This product is widely used in all kinds of gas flowmeasurement, isthe ideal measuring instrument for industrial and commercial users such as factories, organs, hotels, hospitals and large shopping malls to use gas, it has the advantages of accurate metering, reliable performance, and can display various relevant information. Open or close the valveintime to control the gas usage. Suitable for pipe pressure less than 400KPa environment. The product has passed the national explosion-proof product quality supervision departmentaccording to GB3836.1-2010 \"Explosive environment Part 1: equipment general requirements\", GB3836.4-2010 \"Explosive environment electrical equipment Part 4: intrinsic safety explosion-proof type 'i' standard inspection\".

18

Technical parameter

Working pressure: ≤0.4MPaOperating voltage: Lithiumbattery7.2VStatic current: ＜100uAThe maximum instantaneous current of valve opening: ＜400mAPipe joint: Flange connectionBattery life: ≤3yearsWorking environment: -20～+60℃Relative humidity: ≤93%Applicable air source: Liquefied petroleum gas, natural gas, biogasType specification

Table8Model number Diameter (mm)

Operating

pressure

(MPa)

Operating pressure differential MPa(Maximum operating pressure)

VDQ-B-20 DN20 ≤0.4 0～0.005

VDQ-B-25 DN25 ≤0.4 0～0.005

VDQ-B-40 DN40 ≤0.4 0～0.005

VDQ-B-50 DN50 ≤0.4 0～0.01

VDQ-B-80 DN80 ≤0.4 0～0.015

VDQ-B-100 DN100 ≤0.4 0～0.02

VDQ-A-40 DN40 ≤0.4 0～0.005

VDQ-A-50 DN50 ≤0.4 0～0.01

VDQ-A-80 DN80 ≤0.4 0～0.015

VDQ-A-100 DN100 ≤0.4 0～0.02

VDQ-A-150 DN150 ≤0.4 0～0.03

VDQ-A-200 DN200 ≤0.4 0～0.036

19

Overall dimensions and installation

VDQ-A type dimensions VDQ-B type dimensionsSpecification Length Height

(H1)

Height

(H2) Width Nominal

pressure

Flange

connecting

hole

n×Φd

Flange

hole

center

circle KFlangeoutsidediameterDN40 230 365 400 170 1.6MPa 4×Φ18 Φ110 Φ150DN50 230 365 400 175 1.6MPa 4×Φ18 Φ125 Φ165DN80 310 400 440 210 1.6MPa 8×Φ18 Φ160 Φ200DN100 350 430 470 246 1.6MPa 8×Φ18 Φ180 Φ220DN150 480 500 540 336 1.6MPa 8×Φ22 Φ240 Φ285DN200 520 550 590 390 1.6MPa 12×Φ22 Φ295 Φ340DN250 490 640 680 400 1.6MPa 12×Φ26 Φ355 Φ405DN300 590 690 730 450 1.6MPa 12×Φ26 Φ410 Φ460Specification Length Height

(H1)

Height

(H2)

Nominal

pressure

Flange

connecting hole

n×Φd

Flange

hole center

circle KFlangeoutsidediameterDN20 140 240 280 1.6MPa 4×Φ14 Φ75 Φ105DN25 140 245 285 1.6MPa 4×Φ14 Φ85 Φ115DN40 165 272 312 1.6MPa 4×Φ18 Φ110 Φ150DN50 178 286 326 1.6MPa 4×Φ18 Φ125 Φ165DN80 203 320 360 1.6MPa 8×Φ18 Φ160 Φ200DN100 229 340 400 1.6MPa 8×Φ18 Φ180 Φ220Table10Table920

★ The controller should be installed in a well-ventilated location, away fromfire, rain, moisture, and avoid direct sunlight for a long time. Safety height shall complywithrelevant local regulations, as shown in FIG.7:

FIG.7 Controller installation diagram★ Before the controller is connected, the debris in the pipeline should be removed, andthepipeline should have no leakage. ★ The VDQ-A controller must be installed horizontally and properly connected to the air inletand outlet in accordance with the arrow directions indicated. ★ The connection between the pipeline and the gas controller shall not leak, and the gas pressureentering the flow controller shall not exceed 0.4MPa. ★ After installation, apply soapy water to the inlet (outlet) air outlet, check for air leakage, andconfirm that there is no air leakage before normal use. It is strictly forbidden to detect leakswith open flame to avoid accidents. ★ When installing, pay attention to the gas flow arrow at the bottomof the valve, whichindicates the gas flow direction and cannot be reversed. Order instructions

When ordering this product, the user should select the appropriate specifications accordingtothenominal diameter of the pipeline, the flow range, the maximum pressure of the medium, andthepower supply requirements of the connected flowmeter.

21

IC CARD SERIES GAS FLOWMETEROverview

IC card gas flowmeter is a new type of intelligent instrument designed and producedbyourcompany for gas flow measurement. The flowmeter can realize temperature, pressure, compression factor correction. It can detect and display the temperature, pressure, thetotalvolume of the working condition, the total volume of the standard condition, the instantaneousflow of the working condition, the instantaneous flow of the standard condition, the remaininggas (amount) and other information, and supports the functions of IC card charging, dataremotetransmission (optional), valve control (optional), and has a variety of signal output interfaces. The flowmeter can also be embedded in the Internet of Things communication module andvalvecontroller electronic module and IC card function, can form a variety of forms of wirelesscommunication network, and real-time on-demand software upgrade, real-time price adjustment, online payment, valve control and other operations. This is a more suitable for urbangas, petroleum, chemical industry measurement, trade settlement, comprehensive management of theideal integrated intelligent gas flowmeter.

IC card gas Roots flowmeter IC card gas turbine flowmeter

22

Key feature

● Using advanced micro-power high technology, low power consumption, long-termpowersupply with internal battery. ● Can be embedded 4G or NB wireless modules, can form a variety of forms of wireless meterreading system, by the built-in battery power supply is limited number of wireless transmission(once a day), no external power supply, easy to use or external power supply toachieveunlimited number of wireless transmission. ● Integrates gas metering, prepayment and valve control. With fault self-diagnosis andalarmfunction, high reliability, using LCD display, clear and intuitive, easy to read. ● Can choose the amount or gas volume for settlement, support the ladder gas price. ● With real-time data storage function to prevent data loss during battery replacement or powerfailure, internal parameters can be permanently saved in case of power failure. ● Using large capacity data memory, with data tamper-proof function, automatically recordkeydata modification and historical data. ● It has the function of preventing gas theft, and can detect, record and alarmwhen relatedgastheft occurs. Technical performance index

★ Basic parameters of IC card gas turbine flowmeter

Nominal

diameter

(DN)/mm

Flow

specification

Flow range

(m3

/h)

Starting flow

(m3

/h)

Maximumpressureloss(kPa)

50(2\")

50A 6～65 1.1 0.650B 10～100 1.8 1.050C 10～160 1.8 2.180(3\")

80A 8～160 1.7 0.780B 13～250 2.6 1.280C 20～400 2.6 2.3100(4\")

100A 13～250 2.9 0.8100B 20～400 4 1.0100C 32～650 5 2.5150(6\")

150A 32～650 8 0.8150B 50～1000 10 1.0150C 80～1600 10 2.3200(8\")

200A 50～1000 13 0.8200B 80～1600 23 1.5200C 130～2500 23 2.3Table1123

★ Basic parameters of IC card gas Roots flowmeter

a. The accuracy of the flowmeter is class 1.0 and class 1.5 within its specified flowrangeandunder operating conditions

Level 1.0: 0.2Qmax～Qmax: 1.0% ; Qmin～0.2Qmax: ±2.0%

Level 1.5: 0.2Qmax～Qmax: ±1.5% ; Qmin～0.2Qmax: ±3.0%

b. Temperature indication error: ≤±0.5℃

c. Pressure indication error: ≤±0.2%

Nominal

diameter

(DN)/mm

Flow

specification

Flow range

(m3

/h)

Starting flow

(m3

/h)

Maximumpressureloss(kPa)

20(0.8\") G6 0.2～10 0.04 0.1525(1\") G10 0.4～16 0.06 0.20G16 0.4～25 0.06 0.2540(1.5\")

G16 0.5～25 0.07 0.10G25 0.5～40 0.07 0.10G40 0.5～65 0.07 0.2550(2\")

G16 0.5～25 0.07 0.10G25 0.5～40 0.07 0.10G40 0.5～65 0.07 0.25G65 0.5～100 0.07 0.3580(3\") G100 0.8～160 0.10 0.35G160 1.6～250 0.15 0.40100(4\")

G160 1.6～250 0.15 0.35G250 2.0～400 0.30 0.40G400 3.0～650 0.60 0.70150(6\") G400 6.5～650 0.70 0.60G650 6.5～1000 0.70 0.80200(8\") G1000 10～1600 1.20 0.70Table1224

Overall dimensions and installation

The horizontal dimensions of the IC card gas Roots flowmeter are shown in the followingfigure, and the dimensions are listed in Table 13. The flowmeter adopts the flange connection mode, andthe flange size complies with the GB/T9119-2010 standard.

Table13Nominal

diameter

(DN)/mm

Flow

specification

L L1 L2

H B

B1 K n-d RemarkWRZ

/WRD WRM WRZ WRM

/WRD

20(0.8\") G6 130 368 140 305 198 55 75 4×M12 M12×3525(1\")

G10 130 368 140 305 137 198 247 55 85 4×M12 M12×35G16 130 368 140 305 137 198 247 55 85 4 ×M12 M12×3540(1.5\")

G16 172 411 165 344 172 246 289 79 110 4×M16 M16×50G25 172 411 165 344 172 246 289 79 110 4×M16 M16×50G40 172 411 165 344 172 246 289 79 110 4×M16 M16×5050(2\")

G16 172 427 178 344 172 246 289 79 125 4×M16 M16×50G25 172 427 178 344 172 246 289 79 125 4×M16 M16×50G40 172 427 178 344 172 246 289 79 125 4×M16 M16×50G65 172 427 178 344 172 246 289 79 125 4×M16 M16×5080(3\")

G100 172 452 203 351 172 298 343 100 160 8×M16 M16×50G160 241 487 203 434 261 346 390 122 160 8×M16 M16×50100(4\")

G160 241 513 229 434 261 346 390 122 180 8×M16 M16×50G250 241 513 229 434 261 446 490 181 180 8×M16 M16×50G400 241 513 229 434 261 446 490 181 180 8×M16 M16×5025

The vertical installation dimensions of the IC card gas Roots flowmeter are showninthefollowing figure, and the dimensions are listed in Table 14. The flowmeter adopts theflangeconnection mode, and the flange size complies with the GB/T9119-2010 standard.

Table14Nominal

diameter

(DN)/mm

Flow

specification

L L1 L2

H B

B1 K n-d RemarkWRZ

/WRD WRM WRZ WRM

/WRD

20(0.8\") G6 130 368 140 305 198 55 75 4×M12M12×3525(1\")

G10 130 368 140 305 137 198 247 55 85 4×M12M12×35G16 130 368 140 305 137 198 247 55 85 4×M12M12×3540(1.5\")

G16 172 411 165 344 172 246 289 79 110 4×M16M16×50G25 172 411 165 344 172 246 289 79 110 4×M16M16×50G40 172 411 165 344 172 246 289 79 110 4×M16M16×5050(2\")

G16 172 427 178 344 172 246 289 79 125 4×M16M16×50G25 172 427 178 344 172 246 289 79 125 4×M16M16×50G40 172 427 178 344 172 246 289 79 125 4×M16M16×50G65 172 427 178 344 172 246 289 79 125 4×M16M16×5080(3\")

G100 172 452 203 351 172 298 343 100 160 8×M16M16×50G160 241 487 203 434 261 346 390 122 160 8×M16M16×50100(4\")

G160 241 513 229 434 261 346 390 122 180 8×M16M16×50G250 241 513 229 434 261 446 490 181 180 8×M16M16×50G400 241 513 229 434 261 446 490 181 180 8×M16M16×5026

The horizontal installation dimensions of the IC card gas Roots flowmeter are showninthefollowing figure, and the dimensions are listed in Table 15. The flowmeter adopts theflangeconnection mode, and the flange size complies with the GB/T9119-2010 standard.

Table15Nominal

diameter

(DN)/mm

Flow

specification

L L1 L2 H

B

B1 K n-d RemarkWRZ WRM

/WRD

50(2\")

G16 172 479 230 360 246 289 79 125 4×M16 M16×50G25 172 479 230 360 246 289 79 125 4×M16 M16×50G40 172 479 230 360 246 289 79 125 4×M16 M16×50G65 172 479 230 360 246 289 79 125 4×M16 M16×5080(3\")

G100 172 559 310 398 298 343 100 160 8×M16 M16×50G160 241 628 310 398 346 390 122 160 8×M16 M16×50100(4\")

G160 241 628 350 427 346 390 122 180 8×M16 M16×50G250 241 628 350 427 446 490 181 180 8×M16 M16×50G400 241 628 350 427 446 490 181 180 8×M16 M16×50150(6\")

G400 241 798 480 497 646 690 301 240 8×M20 M20×60G650 241 798 480 497 646 690 301 240 8×M20 M20×60200(8\") G1000 460 983 520 549 855 899 400 295 12×M20 M20×6027

The vertical installation dimensions of the IC card gas Roots flowmeter are showninthefollowing figure, and the dimensions are listed in Table 16. The flowmeter adopts theflangeconnection mode, and the flange size complies with the GB/T9119-2010 standard.

Table16Nominal

diameter

(DN)/mm

Flow

specification L L1 L2 L3

H B

B1 K n-d RemarkWRZ

/WRD WRM WRZ WRM

/WRD

50(2\")

G16 172 230 365 363 344 172 246 289 79 125 4×M16 M16×50G25 172 230 365 363 344 172 246 289 79 125 4×M16 M16×50G40 172 230 365 363 344 172 246 289 79 125 4×M16 M16×50G65 172 230 365 363 344 172 246 289 79 125 4×M16 M16×5080(3\")

G100 172 310 418 465 351 172 298 343 100 160 8×M16 M16×50G160 241 310 487 465 434 261 346 390 122 160 8×M16 M16×50100(4\")

G160 241 350 487 505 434 261 346 390 122 180 8×M16 M16×50G250 241 350 487 505 434 261 446 490 181 180 8×M16 M16×50G400 241 350 487 505 434 261 446 490 181 180 8×M16 M16×50150(6\")

G400 241 480 572 720 434 261 646 690 301 240 8×M20 M20×60G650 241 480 572 720 434 261 646 690 301 240 8×M20 M20×60200(8\") G1000 460 520 776 968 540 450 855 899 400 295 12×M20 M20×6028

The horizontal installation dimensions of the IC card gas turbine flowmeter are showninthefollowing figure, and the dimensions are listed in Table 17. The flowmeter adopts theflangeconnection mode, and the flange size complies with the GB/T 9119-2010 standard.

Table17Order instructions

★ Before ordering products, please read this manual carefully, should be based on thenominaldiameter of the pipeline, nominal pressure, flow range, medium maximumpressure, mediumtemperature range, wireless communication mode, valve type and meter head readingtypetoselect the appropriate specifications. ★ The code table of the gas turbine flowmeter ordered by the user is shown as follows.

Nominal diameter A B H D K n L50 332 225 360 165 125 4 1880 447 237 398 200 160 8 18100 533 260 427 220 180 8 18150 934 325 498 285 240 8 22200 1124 385 548 340 295 12 2229

GAS FILTER

GYQ GDQ type gas filter

Overview

Gas filter is an important equipment in gas transmission and distribution system. In the processof gas transmission, in order to ensure the normal work of gas transmission and distributionequipment and instruments such as regulators, valves, flowmeters, pressure gauges andotherinstruments and protect it from being destroyed, it is necessary to remove solid impurities inthegas, in front of the filter must be installed in line with the filter accuracy requirements, gas filteris suitable for natural gas, liquefied petroleum gas, city gas and other gases. Key feature

● Easy to install and operate, simple to use and maintain. ● Filter accuracy is optional, can be equipped with a differential pressure gauge toshowthedegree of filth of the filter element. ● Large filtration area, small fluid flow resistance. ● Stainless steel filter element durable, easy to clean, reusable. ● American standard filter, outlet flange for American standard flange, can be usedwithimported gas Roots flow.

30

Technical parameter

★ GYQ's technical parameter

★ GDQ's technical parameter

Type Specification

Technical Parameter

GDQ

-40A

GDQ

-50A

GDQ

-80A

GDQ

-100A

GDQ

-150A

GDQ

-200A

GDQ-250AGDQ-300AMaximum flow(m³/h) 70 160 400 650 1600 2500 4000 6500Pressure loss(KPa) 0.4 1.5

Nominal pressure PN16, PN25, PN40

Filtration accuracy 20μm(500 items) 40μm(300 items) 50μm(200 items) 130μm(120 items)

Housing material Q235R\\20 16MnR，Q345BScreen material Stainless steel wire mesh

Operating temperature -30℃～+80℃

Overall dimension

Type Specification Technical Parameter GYQ

-20

GYQ

-25

GYQ

-32

GYQ

-40

GYQ

-50

GYQ

-80

GYQ

-100

GYQ

-150

GYQ

-200

GYQ-250

GYQ-300Maximum flow(m³/h) 60 80 100 120 150 400 650 1600 2500 4000 6500Pressure loss(KPa) 0.2 0.3 0.35

Nominal pressure 1.6MPa~4.0MPa 1.6MPa Filtration accuracy 20μm(500 items) 40μm(300 items) 50μm(200 items) 130μm(120 items)

Housing material Carbon steel Q235B Cast steel WCB

Screen material Stainless steel wire mesh

Operating temperature -30℃～+80℃

Table18Table191. Upper cover

2. Plug screw

3. Filter element component

4. Housing

5. Pressure tap

1. Upper cover

2. Plug screw component

3. Housing

4. Differential pressure gauge5. Drain socket

6. Small ball valve

31

★ GYQ's overall dimension

Type

specification

D h h1 L1 L

Flange connectionsizeKn×ΦGYQ-20A 105 142 195 Φ72 ∗ 177 270 Φ75 4×Φ14GYQ-25A 115 142 195 Φ72 ∗ 177 270 Φ85 4×Φ14GYQ-32A 140 142 195 Φ72 ∗ 177 270 Φ100 4×Φ18GYQ-40A 150 142 195 Φ72 ∗ 177 270 Φ110 4×Φ18GYQ-50A 165 142 195 Φ72 ∗ 177 270 Φ125 4×Φ18GYQ-80A 200 168 235 Φ104 ∗ 206 325 Φ160 8×Φ18GYQ-100A 220 210 185 Φ124 ∗ 258 395 Φ180 8×Φ18GYQ-150A 285 252 345 Φ174 ∗ 308 500 Φ240 8×Φ22GYQ-200A 340 300 415 Φ224 ∗ 357 580 Φ295 12×Φ22GYQ-250A 405 291 427 Φ262 ∗ 340 605 Φ355 12×Φ26GYQ-300A 460 338 498 Φ312 ∗ 405 695 Φ410 12×Φ26★ GDQ's overall dimension

Type

specification

Nominal pressure A D L H E

FlangeconnectionsizeKn×ΦGDQ-25

PN16～PN40

Φ183 Φ115 240 260 98 Φ85 4×Φ14GDQ-32 Φ183 Φ140 240 260 98 Φ100 4×Φ14GDQ-40 Φ183 Φ150 240 260 98 Φ110 4×Φ18GDQ-50 Φ240 Φ165 300 388 225 Φ125 4×Φ18GDQ-80 Φ285 Φ200 380 478 290 Φ160 8×Φ18GDQ-100 PN16 Φ340 Φ220 440 590 355 Φ180 8×Φ18PN25～PN40 Φ340 Φ235 440 590 355 Φ190 8×Φ22GDQ-150 PN16 Φ445 Φ285 560 820/980(H1) 555 Φ240 8×Φ22PN25～PN40 Φ445 Φ300 560 820/980(H1) 555 Φ250 8×Φ26GDQ-200

PN16 Φ565 Φ340 760 1050/1250(H1) 740 Φ295 12×Φ22PN25 Φ565 Φ360 760 1050/1250(H1) 740 Φ310 12×Φ26PN40 Φ580 Φ375 760 1050/1250(H1) 740 Φ320 12×Φ30GDQ-250

PN16 Φ680 Φ405 870 1380/1580(H1) 870 Φ355 12×Φ26PN25 Φ680 Φ425 870 1380/1580(H1) 870 Φ370 12×Φ30PN40 Φ680 Φ450 870 1380/1580(H1) 870 Φ385 12×Φ33Table20Table2132

Use and maintenance

● Determine the discharge cycle according to the use conditions and discharge impurities intime. ● When the blocking pressure of the filter element increases significantly, the filter shouldbedisassembled or replaced in time. Generally, the filter should be cleaned once for 1000-1500h, and the filter should be replaced about 8000h. When cleaning or replacing the filter element, the filter inlet and outlet valve should be cut off first, and the gas in the filter shouldbereplaced with nitrogen. After each cleaning, the leakage should be re-detected, andtheair inthe nitrogen gas replacement filter can be reused after confirming that there is no leakage. ● When the differential pressure gauge is configured, the inlet and outlet valves at bothendsofthe differential pressure gauge should be closed before ventilation, and the two inlet andoutletvalves should be slowly opened after the pressure is stable to avoid excessive pressureat theedge of the differential pressure table. Order instructions

If there is any special request, please specify it when ordering.

33

WEM VOLUME CORRECTION INSTRUMENTOverview

WEM type volume correction instrument isanintelligent secondary instrument for gas flowmeterswith pulse signal output such as gas turbine, Rootswheel, precession, turbine street, industrial leatherfilm instrument, etc. It adopts high precisiondigitalsensor, with local pressure and temperaturedetection display, and can be measured accordingto the temperature value and pressure valueof thedetected medium. The flowmeter workingcondition volume flow and total volume flowintothe standard state volume flowand total volume, and with a variety of signal output interface, can be convenient with other secondary instrumentsor computer system networking network management system, the main technologyis inthedomestic advanced level, is the city gas, petroleum, chemical, metallurgy and other industriesgas flowmeter ideal supporting instrument. Key feature

● Using advanced microcomputer technology and high-performance integrated chip, thewholemachine has powerful function and superior performance. ● The circuit adopts surface mounting technology, compact structure, strong anti-interferenceability and high reliability. ● Pressure sensor, temperature sensor, flow sensor all built-in, make the structure more compact. ● With fault self-diagnosis and alarm function, high reliability, using LCDdisplay, clear andintuitive, easy reading. ● The meter comes with a real-time database to prevent data loss during battery replacement orsudden power failure, and internal parameters can be permanently saved in the event of powerfailure. Save user parameters, manufacturer parameters and certain historical records. ● High contrast liquid crystal display, can display date, standard cumulative flow, standardinstantaneous flow, medium temperature, pressure value. ● It can detect the temperature, pressure and flow rate of the measured gas, andcanautomatically track the flow compensation and compression factor correction, and displaythegas volume cumulative flow rate under the standard state (Pn=101.325kPa,Tn=293.15K)(intelligent only). Supporting NX19, SGERG-88, AGA8-92 compression factor calculation. ● With the function of multi-stage instrument coefficient setting and automatic correction. ● The fault of the pressure and temperature sensor can be diagnosed by itself (only intelligenttype), and directly displayed on the LCD screen. When the pressure or temperaturesensorfails to blink, the flow integrator will automatically enter the pressure or temperaturecorrection calculation according to the agreed pressure value or temperature valuemode, ensuring that the interests of both parties are not damaged. ● Anti-magnetic interference design, with anti-demolition, anti-theft function. 34

Technical parameter

Table22Serial

number

designation Technical parameter

1 Conditions of use

Ambient temperature: -20℃～+60℃Medium temperature: -30℃～+80℃Relative humidity: 5%～95%

Atmospheric pressure: 86kPa～106kPa

2 Standard condition P=101.325kPa, T=293.15K(20℃)

3 Accuracy class Level 0.5

4 Explosion-proof class Ex ib IIB T4 Gb

5 Class of protection IP65

6 Electrical performance

index

Power supply mode

Main power 7.2VDC; Auxiliary power 3.6VDC; External

power supply (12V ～28V) DC. Input signal

Flow signal: frequency pulse (0 ～2000) Hz. Temperature signal: -35℃～+125℃(PT1000 platinumresistor or 12C digital sensor). Pressure signal: 0MPa ～ 4MPa, I2C digital sensor. Note: All input signals have been correctly connectedinside the flowmeter, please do not disconnect yourself. Output signal

Pulse signal. 4 ～ 20mA current ring standard current, three-wire

system or two-wire system, default three-wire system. Battery undervoltage alarm signal (BL/Vout). Upper andlower alarm signals (UP, LP). RS485 communication

Communication speed: 4800bps, 9600bps, 19200bps, 38400bps, 57600bps. Communication mode: half-duplex, 8-bit data bit, 1-bit

stop bit, no parity check. The MODBUS communication protocol is adoptedinRTUmode. Wireless remote transmission

Support NB, 4G full netcom.

35

Overall dimension

Order instructions

When ordering this product, the user should select the appropriate specifications accordingtothenominal diameter of the pipeline, nominal pressure, flow range, maximumpressureof themedium, temperature range of the medium and environmental conditions.

36

WEIDU CLOUD IOT

Overview

The Weidu Cloud IOT platform is based on the design concept of \"cloud service multi-terminal\"and adopts various IOT technologies to realize the intelligent connection of gas terminalequipment. Gas applications and various types of information are stored in the \"cloud\", sothatusers can achieve self-service and convenient consumption services through intelligent mobileterminals, business halls and various online payment tools, greatly improving the operationmanagement and service level of gas companies. The Internet of Things platformis composedofa web version on the computer side and a wechat mini program on the mobile side, whichcanrealize functions such as remote meter reading and fault alarm for gas meters. It canalsobespecially customized for customers to integrate IOT netsheets into their own platforms. Key feature

Based on the network automatic meter reading system of the Internet of Things technology, themanagement information service architecture design of \"cloud service multi-terminal\"isestablished, which is composed of wireless remote meter, Internet of Things data acquisitiongateway, system service request, cloud data acquisition software, and cloud systemplatform. Thewireless intelligent flowmeter transmits the data to the concentrator through the wireless sensornetwork, and then the concentrator transmits it to the cloud server platformthrough the GPRSorNB IOT network. The system supports daily reporting and remote centralized meter reading, andbased on the application and management strategy of big data and cloud computing, it canconduct detailed intelligent analysis of a large number of collected gas information to formvalue-added applications of gas big data. In a networked environment, the gas informationterminalcan actively upload all kinds of fault information to the cloud data center and business platformsystem in real time, and automatically report to the system. Implementation method: The volume correction instrument is embedded with wireless modulessuch as GPRS or NB IOT, and is powered by the built-in battery to achieve wireless transmissionsuch as timing, triggering, power-on, abnormal and interval reporting, without external powersupply, easy to use. Reporting success rate: In a specific environment (good network environment), set a 5-minuteupload cycle, through the test, the flowmeter data reporting success rate should be not lessthan99.6%. 37

Main function of system

● Equipment management: including equipment basic information and installationpositioninformation, it can be remote valve setting and recharge price adjustment. ● Customer management: display, add and modify information for customer groups. ● Data query: including data real-time monitoring and map query, historical data can be queried, basic remote control and other functions. ● Monitoring operation and maintenance: includes two modules: real-time monitoring andalarmcenter, which can make data monitoring more convenient, timely and effective. ● System management: includes system management and log management, in whichlogmanagement is divided into system log and control log. ● Basic configuration: edit and manage metering or billing prices.

38

Large screen real-time monitoring

The real-time monitoring system can provide a more intuitive and efficient monitoringmethodfor gas companies and customers. The monitoring platform contains the latest meter readingdata, total data comparison, meter installation position and abnormal status alerts. These aretheinformation that users need to grasp in real time, and they can take correspondingmeasuresimmediately in case of abnormal conditions.

Mobile phone applet

For the mobile end, the development of supporting the

Cloud IOT wechat mini program system can also

monitor and query the real-time and historical data of

the remote flowmeter on the mobile phone, and can

control its on-off valve and recharge function, which

greatly facilitates the use of users and gas companies. 39

CORPORATE PRESENCE

40

Integrity/Focus

Innovation/Win-winZHEJIANG WEIDU INSTRUMENTCO.,LTDAdd: No.17, Binhai 3 Road, Yongxing Street, LongwanDistrict,Wenzhou City, Zhejiang Province,China

We bsit : www.we idu-flowme t e r. comTel: 0577-56607389

Postcode: 325024

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