The on-site gauge of the Yokogawa Worm Gear Flow Meter shows a reading, but there is no signal output
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This post was last edited by Clouds in the mist/love on 2018-8-21 at 17:13. The on-site display of the Yokogawa DY040 vortex flowmeter shows a value of 8 cubic meters per hour; its range is 0–30 cubic meters. However, there is no signal output – the measured current is only 1.7 mA, and the voltage is 23.6 VDC. What could be the problem?
This circuit should be a 4-wire system; if you measure 23V, it’s likely that the output current wires are connected incorrectly. Or a surge; a damaged safety barrier causes an open circuit.
The last edit to this post was made by 955559 on 2018-8-22 at 13:39. 1. Fault symptoms: The vortex flowmeter shows no display when powered on, and it emits no signal. Possible faults: 1) Insufficient power supply to the instrument’s sensor； 2) The flow rate inside the pipeline is too low or there is no fluid flow ； Solution: 1) Check whether the wiring of the instrument sensor is normal ； 2) Locate the valve and open it slowly ； 2. Fault phenomenon: No flow exists in the pipeline of the vortex flow meter, yet the sensor outputs a signal ； Possible faults: 1) Poor grounding of the vortex flow meter results in 50Hz frequency interference ； 2) Excessive vibration in the pipeline where the vortex flow meter is installed ； 3) The sensor gain of the instrument is high ； Solution: 1) Re-ground the instrument ； 2) Strengthen the pipeline in a triangular pattern, and then reinforce it at a 2D distance upstream of the vortex flow meter ； 3) Adjust the sensor’s gain to an appropriate value ； 3. Fault symptoms: Large fluctuations in the flow meter reading. Possible faults: 1) Excessive vibration in the pipeline where the vortex flow meter is installed ； 2) The sensitivity of the vortex flow meter is set too high ； 3) Damaged circuit board ； 4) Large pressure fluctuations ； 5) The vortex sound generator has attachments ； Treatment method: 1) Strengthen the pipeline in a triangular pattern, and then reinforce it at a 2D distance upstream of the vortex flow meter ； 2) Reduce the sensitivity of the instrument ； 3) ) Replace ； 4) Measure the pressure and adjust it to the normal value ； 5) Clean the vortex generator of the vortex flow meter ； 4. Fault symptoms: Large error in vortex flowmeter readings. Possible faults: 1) The distance between the straight sections upstream and downstream of the vortex flowmeter does not meet the required standards ； 2) The instrument constant of the vortex flow meter is set incorrectly ； 3) Attachments upstream of the vortex sound generator ； Solution 1): Change the installation location and select a new installation site as required by the instructions ； 2) Recalibrate the instrument constants of the vortex flow meter ； 3) Clean the vortex generator of the vortex flow meter ；
Is it because the transmission distance is too long and the voltage is insufficient?
OP, was this issue resolved later? What’s the reason?
Yokogawa’s vortex flowmeters are all two-wire type; where did you learn that they are four-wire type?
It is very likely that there is a poor connection somewhere in the circuit, resulting in too high an impedance. Or there is a leakage in the circuit of the instrument.
Has it been solved? If it’s resolved, please let me know the cause of the fault