一、Product Summary
Dear users, thank you for using our membrane gas meter. Please read this instruction manual carefully before using it, so that you can easily use our products.
The movement is integrated with mold and injection, and the structure is simple; The whole movement has only 27 kinds of 45 parts, thus reducing the number of parts, reducing accumulated errors and ensuring the accuracy and reliability of measurement;
The rotary distribution structure is adopted, which runs smoothly, overcomes the defects of reciprocating distribution structure and enhances the measurement reliability;
The rotation is stable and never leaks, thus ensuring the safety performance of the product; The rotation of the movement transmission mechanism is transmitted to the counter outside the shell through magnetic force, ensuring accurate measurement, stable performance and good consistency of repeated detection; The internal control indication error index is ± 1%, which can ensure that the detection in different regions can be qualified;
The surface of the shell is treated with plastic spraying, which has bright color, beautiful appearance and good corrosion resistance. It is designed with a variety of structures and devices to prevent external interference and damage.
GB/T 6968-2019 Membrane Gas Meter
Verification Regulation of JJG 577-2012 Membrane Gas Meter
二、Working Principle
When the flowing gas passes through the gas meter, As a result of pipe friction and mechanism obstruction, There will be a pressure difference between the inlet and outlet of the gas meter, This pressure difference mainly pushes the diaphragm of the diaphragm gas meter to move in the metering chamber, At the same time, it drives the coordinated gas distribution of the gas distribution mechanism, So that the motion of the diaphragm can be continuously reciprocated, Through crank-rocker mechanism, This linear reciprocating motion is transformed into a circular motion, The circular motion then pushes the counter to rotate through the motion transmission mechanism to record the number of reciprocating motions of the diaphragm. As the diaphragm reciprocates once, a certain amount of gas is discharged, and the counter finally displays the volume of the measured gas through the conversion of the transmission chain to achieve the purpose of measuring gas.
三、Function List
|
Serial Number |
Functions |
Comments |
|
1 |
Metering function |
1. Accumulated flow of real-time reed counter 2. Ultrasonic measurement |
|
2 |
Gas metering data history memory local |
1. For the latest 90 days, the measurement data is stored every hour 2. The latest 180 days, the measurement data is stored every day 3. Monthly storage of measurement data in the latest year |
|
3 |
Power supply |
The main battery is the normal power supply, and the other battery is the backup battery |
|
4 |
Main battery capacity level indication |
1. report that current battery capacity level suffix to the server in each metering data message uplink report 2. Low battery threshold: 20% and will trigger the uplink report of low battery capacity alarm message, which will be reported every 24 hours until the standby battery switch threshold. 3. Battery switch threshold: 10% capacity will trigger the backup battery switch. |
|
5 |
Backup the battery switch only in the following cases, otherwise use the main battery |
1. Pull out the main battery or the main battery does not exist 2. The power of the main battery meets the switching threshold (10%) 3. The backup battery switch is automatic, so it will never be powered off. |
|
6 |
Backup Battery Function |
1. Maintain local metering of water flow 2. measurement data history storage and maintenance proces 3. Spare battery life should exceed at least 7 days 4. When the power supply is switched to the backup battery, the backup battery switch alarm information will go up to the server to tell the switch that it has occurred. |
|
7 |
Backup battery protection during transportation |
Prior to field activation, the gas meter is only equipped with a spare battery, which is protected against consumption during storage or transportation at this stage |
|
8 |
Wireless/wired technology |
Lorawan/NBIOT/GPRS/RS485 |
|
9 |
Fixed time measurement data report |
1. Latest cumulative measurement data 2. Gas meter status: valve status/power supply 3. Battery capacity level 4. Downlink Signal Strength Indication RSSI/SNR |
|
10 |
Alarm Message Uplink Report |
1. Battery Capacity Low Level Alarm 2. Backup battery switch alarm 3. Valve fault alarm 4. Vibration alarm (the meter has a buzzer, which can realize sound alarm when vibrating and is generally used for earthquake protection) 5. High temperature alarm (alarm is not realized at present, only temperature is monitored, which is generally used for fire protection)
|
|
11 |
Downlink Configuration/Query |
1. Set/Query Periodicity of Periodic Measurement Data Report 2. On/Off/Setting/Query/Time of Fixed Time Measurement Data Report 3. Modify accumulated traffic data for calibration 4. Read the current accumulated traffic data 5. Read the battery capacity level 6. Valve Control Close/Open |
|
12 |
Screen digital display |
1. The screen displays four screens, and the screen can be cut 2. Display contents: current reading, electric quantity, balance, valve status, signal status, temperature, time and vibration reminder 3. Display mode: The button lights up and automatically closes after 5 seconds without operation, and the screen can be cut |
|
13 |
433 air leakage detection linkage valve closing |
1. Monitor methane in real time, and give an alarm if the concentration exceeds 5% LEL 2. Receive sensor data through 433 communication, and perform valve closing operation Communication distance 50m (recommended to be installed near gas meter) |
四、Performance characteristics
1. High measurement accuracy. The movement redesigns the rotating volume, and the difference between the diaphragm volume and the standard volume is less than 10% dry, so the change of the rotating volume will be very small within the size error range of each part, thus improving the accuracy of measurement;
2. high stability and good consistency of repeat detection. that unique diaphragm limit and forced diaphragm turnover device is adopt, The limit of each movement of the diaphragm is at the same position, so that each movement of the diaphragm is filled with the same amount of gas, even after multiple movements and detections, the error of multiple detections is greatly reduced, and the stability of the table and the consistency of repeated detections are improved;
3. good durability. The low-temperature diaphragm is adopted, and has very good softness, and will not deform after multiple operations, so that the rotation volume will not change too much, and the durability of the table is greatly improved;
五、Technical Parameters
|
Technical parameter name |
unit |
G1.6 |
G2.5 |
G4 |
|
Minimum flow |
m3/h |
0.016 |
0.025 |
0.04 |
|
Initial flow |
m3/h |
≤0.003 |
≤0.005 |
≤0.005 |
|
Maximum flow |
m3/h |
2.5 |
4 |
6 |
|
Gyratory volume（Vc） |
dm3 |
1.2 |
||
|
Maximum allowable error |
% |
(0.1qmax≤q≤qmax)±1.5 （qmin≤q≤0.1qmax）±3 |
||
|
Maximum working pressure |
kPa |
≤50 |
||
|
pressure loss |
Pa |
≤200 |
||
|
Airtightness |
kPa |
No leakage at 75kpa for 3 minutes |
||
|
Durability |
h |
It can run for 2000 hours and meet the above performance index |
||
|
Ambient temperature range |
°C |
-10°～40° |
||
|
Table joint center distance |
mm |
130 |
||
|
Table joint thread |
mm |
M30*2 |
||
|
External union thread |
DN |
DN15 |
||
|
Dimensions（L*B*H） |
mm |
203 x 130 x 225 |
||
|
weight |
kg |
2 |
||
|
Explosion proof grade |
\ |
Exib II B T3 Gb |
||
|
Protection level |
\ |
IP54 |
||
|
Communication support |
|
Lorawan/NBIOT/GPRS/RS485 |
||
六. Product Structure and Size
| Product size | G1.6，G2.5，G4，G6 |
| Gyratory volume（Vc） | 1.2dm3 |
| Maximum working pressure | ≤50kPa |
| pressure loss | ≤200 |
| Table joint center distance | 130mm |
| Protection level | IP54 |
| 通讯支持 | Lorawan/NBIOT/GPRS/RS485 |
