Shenyang Turbine Flow Meter | Turbine Flow Meter

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1. Reasons for non zero display of turbine flowmeter

The main reasons for non zero display of turbine flowmeter are external interference, mechanical vibration, valve leakage or internal faults of the instrument. The specific analysis is as follows: poor grounding of transmission line shielding. When the transmission line shielding layer is not effectively grounded or the grounding resistance is too high, external electromagnetic interference (such as electromagnetic fields generated by motors, frequency converters, high-voltage cables, etc.) may invade the input end of the display instrument through signal lines, causing zero drift or abnormal fluctuations in flow display. At this point, it is necessary to check the grounding status between the shielding layer and the display terminal to ensure that the grounding resistance meets the requirements (usually ≤ 4 Ω). If necessary, re weld the grounding wire or replace the shielding cable. Pipeline vibration causes impeller vibration. During fluid transportation, mechanical vibration is generated by equipment such as pumps and compressors, or resonance is caused by fluid pulsation (such as reciprocating pumps and quick opening and closing valves), which can cause periodic vibration of the impeller of the turbine flowmeter. This abnormal rotation will be misjudged by sensors as fluid flow, resulting in erroneous signals. The solution includes: installing rigid brackets before and after the sensor to reduce the transmission of pipeline vibration; Perform shock absorption treatment on the vibration source (such as installing shock absorbers and elastic joints); Adjust fluid conditions to avoid pulsating flow (such as adding buffer tanks). If the shut-off valve is not

tightly closed, it may cause leakage. If there is internal leakage in the shut-off valve in the pipeline (such as valve seat wear or scratched sealing surface), even if the valve is in the closed state, a small amount of fluid still passes through the turbine flowmeter, causing the display instrument to continuously record the flow value. At this point, it is necessary to inspect or replace the valve to ensure that its sealing performance meets the requirements (leakage ≤ allowable value). Internal faults of the display instrument: The electronic components of the internal circuit board of the display instrument may age, deteriorate or be damaged due to long-term use or environmental factors (such as humidity, high temperature), which may cause the following problems: signal interference: self-excited oscillation or noise caused by changes in component parameters (such as capacitor leakage, resistance drift), which may be superimposed on the normal flow signal; Zero drift: The performance of key chips such as operational amplifiers and analog-to-digital converters decreases, causing the displayed value to deviate from the true zero point; Short circuit or open circuit: virtual soldering of circuit board solder joints, short circuit or open circuit of components, damaging the signal transmission path. For this type of fault, the "short circuit method" can be used to troubleshoot by disconnecting the sensor from the display instrument and observing whether the displayed value returns to zero. If zeroed, the fault lies in the sensor or pipeline; If it still does not return to zero, the fault lies in the display instrument; Inspect the internal circuit board of the display device item by item, focusing on the power circuit,

Shenyang Turbine Flow Meter | Turbine Flow Meter

1. Reasons for non zero display of turbine flowmeter

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