1. The flow sensor has no signal output after china steam vortex flow meter For sale is powered on
Possible fault causes and treatment methods of china steam vortex flow meter For sale:
1) The process medium in the pipeline does not flow. Inform the process operator to open the valve.
2) The process medium in the pipeline flows but china steam vortex flow meter rate is low. The gauge can only be replaced because the diameter is too large due to the wrong instrument selection.
3) If the process status is normal, the instrument may have a fault, which can be checked and maintained level by level. Vortex frequency detection element, i.e. probe, is mainly piezoelectric at present. The insulation resistance of the probe is measured with a multimeter of 200Mf~, which should be 10~IOOM~at room temperature. Use a 2n multimeter to measure the capacitance of the probe. The capacitance shall be constant between 0.15 and 0.35nF at no load. The amplifying board circuit is equipped with signal detection points i and i, and the oscilloscope is used to detect the waveforms of each point one by one. Generally, at the detection point in front of Schmitt trigger, the signal waveform should be a sine wave with unequal amplitude, and the signal waveform after Schmitt trigger is a square wave.
4) The sensor power supply of china steam vortex flow meter For sale is incorrect. Check whether+12VDC or+24VDC sent by the flow totalizer to the sensor is normal.
5) If the primary instrument of china steam vortex flow meter For sale is normal after inspection, it indicates that the fault is in the secondary instrument, and the fault of the secondary instrument can be checked.
2. Possible fault causes and treatment methods of sensor signal output when china steam vortex flow meter For sale in the pipeline has no flow:
1) The pipe vibration makes the sensor output false signal. Find the vibration source, eliminate the pipeline vibration or conduct vibration reduction treatment for the process pipeline.
2) Poor grounding, introduction of interference and false signal. Check the grounding resistance, which should not be greater than 10Q, otherwise handle the grounding.
3) The sensor gain is too large. Adjust the gain potentiometer to the appropriate value.
4) There is power frequency interference. Check the signal frequency output by the sensor. If it is 50Hz, it indicates that there is a high-power motor or a relatively strong electric field near the flowmeter. Certain measures should be taken to reduce the interference or strengthen the shielding of the signal line.
3. The sensor output signal is unstable when china steam vortex flow meter For sale is under normal flow
1) The pipeline has irregular vibration. Find the vibration source, eliminate the pipeline vibration or conduct vibration reduction treatment for the process pipeline.
2) The amplifier board gain is incorrect. Use an oscilloscope to check the waveform of the output signal. If there are multiple waveforms and waveform loss, the amplifier board is not working properly. Multiple waveforms indicate that the gain is too large, and waveform loss indicates that the gain is too small. You can adjust the gain of the amplifier board appropriately.
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