Yokogawa vortex flow meter
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The Yokogawa vortex flowmeter DY series is of the split-type type; the on-site transmitter shows the correct flow rate, but the value displayed in the DCS is always at full scale. It seems to be a fault with the output module – can it be repaired? Or replace the entire transmitter gauge head?
It’s better to buy a new one instead of having Yokogawa do the repair; they’re not willing to take on repair work either.
How long has it been in use? I’ve never seen this kind of issue with Yokogawa products. What wiring system does yours use?
How many-wire Yokogawa vortex flowmeters have you used?
What makes you say it’s a fault in the output module? First, you should measure whether the A/I terminal of the DCS is showing a normal current value, or check the output signal of the flow meter to ensure that it has the correct output settings. Yokogawa’s vortex flowmeters can generate different signals depending on the wiring used. The default output signal is an analog current value, but pulse or contact signals can also be produced through specific wiring methods; it is necessary to carefully read the operation manual for this information.
Replacing the display module will do, but it is necessary to determine whether the issue lies with a faulty module, a setting problem, or a DCS channel problem
Do you mean that Yokogawa’s vortex flow meters only come in two-wire versions? :o
I repaired a flow meter from a certain factory; it had 3 circuit boards: a signal processing board, an output board, and a power supply board. Yokogawa’s version hasn’t been tried; let’s see if it’s also made up of several boards as well – replacing the output board should do the trick.
First, measure the current at the transmitter’s output terminal. If the current is correct, then check the range of the DCS at the receiving end or the issues with the AI module; if the current is incorrect, then examine whether the transmitter’s settings and wiring are proper.