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| NB-IoT Diaphragm Gas Meter |
GPRS/NB IoT gas meter is a smart gas metering product based on ZENNER mechanical diaphragm gas meter, combined with a built-in shut-off valve basement and a smart controller with GPRS/NB-IoT communication module. 
Features Internet of Things technology: Using low-power wide area network LPWAN narrowband Internet of Things communication technology NB-IoT for data transmission, with wide coverage, large connection, low power consumption and other characteristics Stable and reliable communication: using NB-IoT communication module, patch SIM card, using the operator's public network transmission and communication, safe and reliable Data upload: Provides the functions of reporting data periodically, triggering keys, and reporting data on power-on Automatic alarm: When magnetic interference, valve, abnormally large flow, low power and other anomalies occur, the valve is automatically closed and the fault information is reported to the management system Remote valve control: can remotely control the valve, for emergencies or malicious customers, can remotely close the valve Automatic closing valve: if the gas closing valve is not used for a long time, the function of the two-stage gas closing valve can be set for n days to ensure the safe use of gas Optional functions: Temperature or temperature compensation, step charging function can be added as required Double reed tube pulse, photoelectric direct reading counter Low-power design: Lithium batteries with a service life of more than 10 years
Parameters
| Nominal flow rate(m³/h) | 1.6 | 2.5 | 4 | | Maximum flow(m³/h) | 2.5 | 4 | 6 | | Minimum flow(m³/h) | 0.016 | 0.025 | 0.04 | | Pressure loss(Pa) | ≤250 | | Working pressure range(kPa) | 0.5~50 | Indication error | 0.1Qmax≤Q≤Qmax | ±1.5% | | Qmin≤0.1Qmax | ±3% | | Accuracy class | Level 1.5 | | Working voltage | External DC6V(4 5# alkaline batteries), built-in 3.6V lithium battery | | Battery life | According to the data reporting cycle, once a day can reach more than 1 year | | Data acquisition mode | Dual pulse or photoelectric direct reading | | Static working current | <30μA | | Support band | NB-IoT public network authorized frequency band | | Communication distance | NB-IoT network coverage | | Communication cycle | Customize the hour, day, and month | | Enviromental parameter | Working temperature :-10℃ ~ +40℃, storage temperature :-20℃ ~ +60℃ Working humidity: 5% ~ 95% no condensation | | Sample mode | Double reed tube pulse, photoelectric direct reading counter | Can be accurately measured | | Anti-reverse function | Anti-reverse flow device is optional for steel and aluminum shell watches | Gas meter backloading | | Measurement form | Gas measurement, amount measurement can be switched | The amount of measurement can be adjusted |
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