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『Methane gas flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
Is the gas mass flow meter user-friendly?
2. How to calibrate the sensitivity of gas alarm probes
The core method for calibrating the sensitivity of gas alarm probes is to use standard concentration gas for calibration, adjust the potentiometer on the circuit board or set parameters through dedicated software.. 1. Calibration preparation • Standard gas: Methane (CH ₄) is configured at 1-50% LEL (lower explosive limit), and it is recommended to use a 25% LEL concentration (if the lower explosive limit of methane is 5%, the standard gas concentration is 1.25% by volume) • Equipment requirements: A flow meter (0.5-2L/min), pressure reducing valve, and airtight connecting pipe are required. 2 Hardware calibration steps: ① Disassemble the probe housing in power-off state and find the potentiometer marked with "SENS" or "GAIN". ② Preheat for 10 minutes and introduce standard gas for 90 seconds. ③ Observe the alarm indicator light and signal output: - Analog signal type (4-20mA): Adjust to 12mA corresponding to 25% LEL. - Digital signal type: Measure the TXD terminal with a multimeter, and the output frequency should be within ± 5% of the calibration value Software calibration (smart model) - connect RS485 interface or Bluetooth, use manufacturer specific software (such as Honeywells GasAlertSuite) - input calibration gas concentration value, the system automatically completes ADC reference voltage adjustment 4 Verification Standards | Project | Industrial Grade Requirements (GB 15322.1-2019) | Civil Grade Requirements (GB 15322.2-2019) | | ----------------------------------------------------------------------------------------------------------------------------------------------. After calibration, fa
3. Technical parameters of gas flowmeter
Technical parameters of gas flowmeter are as follows
1. Measurement range: Under standard conditions (20 ℃, 101.33KPa), the measurable gas flow range is (0.05-80) Nm/s
2. Applicable medium: Suitable for measuring most clean gases except acetylene gas
3. Temperature adaptability: The ambient temperature is between -40 ℃ and+60 ℃, and the medium temperature can withstand -10 ℃ to+200 ℃
4. Accuracy and repeatability: The reading accuracy reaches ± 1%, and the repeatability at full range is ± 0.5%
5. Output signal: Provides instantaneous flow 4-20mA DC signal, maximum load of 600 Ω, supports RS232 and RS485 communication differential mode, response speed less than 1 second
6. Power supply requirement: 24VDC power supply, voltage fluctuation range of ± 10%
7. Mechanical connection: adopts 3/4 NPT Stainless steel fasteners, standard probe length is 800mm, can be customized for special requirements
8. Straight pipe section requirements: There are no strict regulations on the length of straight pipe sections, which can be selected according to actual installation needs. 9. Pressure loss: The pressure loss generated by the flowmeter during operation can be ignored. 10. Working pressure
1.6MPa is the maximum working pressure that the flowmeter can withstand. 11. Display function: The on-site display adopts LED, with the upper row displaying instantaneous flow rate with 4 characters per line, and the lower row displaying cumulative flow rate, supporting switching between imperial or metric units. 12. Data prote