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1. Doppler ultrasonic flowmeter
2. Volume correction instrument Gas meter usage tips
1. Converting natural gas operating condition volume to standard condition volume A flowmeter gas volume correction instrument is being developed. The formula for converting natural gas standard condition volume is different from that of ordinary gas and must comply with the standard SY/T6143-1996 published by China National Petroleum Corporation. The gas equation Qn=Zn/Kg • (Pg+Pa)/Pn • Tn/Tg • Qg. In the formula: Qn - volume flow rate under standard conditions (Nm3/h) Zn - compression coefficient under standard conditions Zg - compression coefficient under working conditions Pg - gauge pressure (KPa) Pa - local pressure. Pressure (KPa) Pn - Standard atmospheric pressure (101.325KPa) Tn - Absolute temperature under standard conditions (293.15K) Tg - Absolute temperature of the medium (273.15+t) Kt - Celsius temperature of the measured medium (℃) Qg - uncorrected volumetric flow rate (m3/h) Note: For natural gas, Zn/Zg=Fz2, where Fz is called the over compression factor, calculated according to the formula in the standard SY/T6143-1996 of China National Petroleum Corporation If users need to adjust the compression factor of natural gas flow, they should provide the following data: the true relative density of natural gas (0.550 ≤ Gr ≤ 0.750), the mole fraction of carbon dioxide in natural gas (Mc ≤ 0.15), the mole fraction of nitrogen in natural gas (Mn ≤ 0.15), and the determination of the true relative density Gr of natural gas. The true relative density Gr of natural gas is defined as the ratio of natural gas density to dry air density under the same state, and Gr is the true relative density under standard conditio
（1） In the formula: Gi - the ideal relative density of natural gas, calculated according to formula
(2); Za - the compression factor of dry air under standard conditions, with a value of 0; Zn - compressibility factor of natural gas under standard conditions, calculated according to formula
(3) Gi=∑J=1nXjGij…………………………………………………
（2） In the formula: Xj - the mole fraction of component j in natural gas, given by gas analysis; Gij - the ideal relative density of natural gas component j, obtained from the appendix; N - Total number of natural gas components, determined by gas analysis Zn=1–（∑J=1nXj√bj）2+0.0005(2XH–XH2)……………………
（3） In the formula: √ bj - the summation factor of the j component content in natural gas, which can be found in the appendix; XH - the molar coefficient of hydrogen content in natural gas, given by gas analysis This formula is also suitable for volume conversion of differential pressure flow meters and gas ultrasonic flow meters under standard conditions For more information, please contact Shanghai Hongke Automation Instrument Co., Ltd. 2. Tips for troubleshooting gas meters:
1. No response after powering on the gas meter: Reason for the fault: Check that the battery polarity is reversed and the battery has poor contact with the spring. Early measures: Reinstall the battery once. Remove the oxide layer on the spring of the battery box to ensure good contact between the battery and it.
2、 No response after inserting IC card: Fault cause: Incorrect insertion of card, dirty and poor contact of IC card socket contacts. Measure: Insert the IC card into the card slot in
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