The Yokogawa mass flow meter shows a negative value
Thread Content
The Yokogawa mass flow meter is used for denitration purposes to measure liquid ammonia. It has been in use for some time now, but the meter is showing negative values – what could be the reason?
Try changing the processor; in many cases, it’s this one that’s broken
That means it worked fine before, but suddenly it doesn’t work anymore and shows a negative value? Well, can this negative value correspond to your actual traffic volume? If it matches, then it’s likely that someone reversed the flow direction in the flow meter configuration; you just need to correct it. It’s best to confirm with the process team whether the pipeline flow is bidirectional, and then address the instrumentation issues. Don’t end up working for nothing! If it’s incorrect to say that negative values in reality are simply nonsense, then it must be a problem with the instrument; further investigation is needed to find the cause.