Gas turbine flowmeter company | Difference between gas turbine flowmeter and gas waist wheel flowmeter

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1. I am looking for a gas mass flow meter. 2. Xuner Instrument | Connection problem of isolation barrier causes gas turbine flow meter failure. Case study sharing: A case analysis of gas turbine flow meter display failure caused by isolation barrier connection problem is as follows: A certain combustion equipment company encountered a problem of instrument current output not matching the upper system when measuring gas consumption using gas turbine flow meter, specifically manifested as a constant difference of 10 cubic meters in flow data. After investigation, the root cause of the fault was an incorrect wiring method of the isolation barrier, which resulted in a current attenuation of 0.4mA. The fault phenomenon and initial problem during the investigation process were: a three wire current transmission system was used on site, the instrument displayed normal current, and the touch screen upper limit was set consistently, but the flow data deviation was significant. After disconnecting the wire, the instrument output was measured directly and found to be normal. After wiring, the test circuit current decreased by 0.4mA. Isolation barrier verification: The measurement was normal when the isolation barrier was not connected, but the current decreased by 0.4mA after connection. It is preliminarily judged that there is a problem with the isolation barrier or wiring. After replacing the isolation barrier, the fault still persists, and the equipment itself has been ruled out. Confirm the function of the isolation barrier terminals: Terminal 1 is negative, Terminal 2 is signal, and Terminal 3 is 24V positive. The original wiring on site only connects terminals 1 and 2, without utilizing the power supply function of terminal 3. Wiring error and current attenuation mechanism error Wiring method: Only connect the 1st (negative) and 2nd (signal) terminals of the isolation barrier on site, without connecting the 3rd terminal (24V positive). This wiring caused an abnormal shunt path between the signal circuit and the internal circuit of the isolation gate, and the common negative terminal (No. 1) was mistakenly connected, resulting in current attenuation. Correct wiring scheme: Utilize the 24V power supply function of the isolation barrier to connect terminal 3 (24V positive) to the instrument power supply terminal, forming a complete power supply circuit. After the correction, the wiring method eliminated the shunt and the current returned to normal. Summary of fault causes and measurement errors: There were defects in the initial current testing method used by on-site personnel, which resulted in the failure to detect attenuation issues in a timely manner. Insufficient understanding of wiring: Insufficient comprehension of the coordination requirements between three wire current transmission and isolation gate feeding functions. The stove shed mistakenly connected the common negative terminal (No. 1) to the signal circuit, forming an abnormal diversion path. Neglecting equipment characteristics: The isolation barriers built-in 24V power supply function has not been utilized, resulting in an incomplete power supply circuit. Lessons learned and improvement suggestions for pre wiring verification: Confirm the functional definition of the isolation barrier terminal, distinguish between the signal terminal, power supply terminal, and common terminal. Three wire instruments need to ensure independent connection of signal and power lines to avoid s

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