Dear users, thank you for using our ultrasonic gas meter. Please read this instruction manual carefully before using it, so that you can easily use our products.
Ultrasonic gas meter is a new type of all-electronic metering gas that uses the time difference of ultrasonic transmission in the medium to measure
Gas meter has endogenous functions such as high reliability, high precision, temperature and pressure compensation, etc.
It can communicate with other equipment through wired or wireless interface to form a remote meter reading management system. The prepayment mode is flexible, which can not only support the prepayment of local IC cards, but also carry out remote prepayment on the system platform, which greatly facilitates the statistics and management of users' gas consumption behavior by managers
Implementation standard: JB/T 12958-2016 Verification Regulation of Domestic Ultrasonic Gas Meter
二、Working Principle
Ultrasonic measurement adopts the time difference measurement technology. Its working principle is to use a pair of ultrasonic transducers to send and receive ultrasonic waves alternately (or simultaneously), and indirectly measure the fluid by observing the time difference between the downstream and countercurrent propagation of ultrasonic waves in the medium
An indirect measurement method that calculates the flow rate through the flow rate.
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. The product structure is highly upgraded and optimized through the combination of international advanced technologies, with wide applicable flow range, high sensitivity and accurate and reliable measurement;
2. After structural optimization, the metering chamber body is small in size and light in weight, and the stability and sealing performance of the movement group are greatly improved;
3. The movement transmission structure is transmitted to the counter outside the shell through magnetic transmission to ensure stable transmission of the counter and no leakage;
4. The shell is integrally stretched and formed with high-quality deep-stretched steel plate, and the surface is treated with galvanizing and anti-corrosion treatment and plastic spraying treatment, so that the color is uniform and bright, and the corrosion resistance is strong;
5. The connecting nut of the outer pipe joint of the gas meter adopts an anti-disassembly and anti-theft device;
6; The air outlet pipe is integrally formed by aluminum alloy die casting, which has good corrosion resistance and anti-damage and gas theft function;
5. Technical Parameters
|
Minimum flow |
M3/h |
0.06 |
|
Initial flow rate |
M3/h |
≤ 0. 008 |
|
Maximum flow |
M3/h |
10 |
|
Cyclotron volume (Vc) |
Dm3 |
3.5 |
|
Maximum allowable error |
% |
(0.1 qmax ≤ q ≤ qmax) ± 1. 5 (qmin ≤ q ≤ 0. 1qmax) ± 3 |
|
Maximum working pressure |
KPa |
≤ 30 |
|
Pressure loss |
Pa |
≤ 200 |
|
Sealability |
KPa |
No leakage at 75KPa for 3 minutes |
|
Durability |
H |
Run for 2000 hours to meet the above performance indicators |
|
Ambient Temperature Range |
° C |
-10 ° ~ 40 ° |
|
Outline Dimensions (L*B*H) |
Mm |
345x 198 x 299 |
|
Center distance of meter joint |
Mm |
250 |
|
Weight |
Kg |
5 |
|
Explosion-proof grade |
\ "You know,\" |
Exib II B T3 Gb |
|
Level of protection |
\ "You know,\" |
IP54 |
|
Communication Support |
\ "You know,\" |
Lorawan/NBIOT/GPRS/RS485 |
| work pressure | 0-50Kpa |
| Operating temperature | -10~40℃ |
