The current Rosemount gas flow meter range is 0-1.612 Kpa, with a capacity of 80,000
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The current Rosemount gas flow meter has a range of 0–1.612 Kpa, with a measurement capacity of 80,000. However, the display value usually exceeds 1.612, and the reading is also higher than 80,000; it reaches up to 84,000 before showing no further increase. Is this normal?
Why is the flow measurement range in pressure units?
Is it a differential pressure flow meter? If the differential pressure value is at its maximum, check whether there is a blockage or leakage in the pressure guiding tube; if not, it is likely a problem with the selection of the component.
Find the reason for the overload. Check the two aspects mentioned in 3#.
Do you always use it at full scale? Check whether the instrument’s zero point is not at zero; for example, is it at a value slightly above zero? Confirm the design
Agree with the third floor – in such cases, it is usually due to a clogged pressure guide tube, which causes pressure on one side or leakage on that side. Once problems with the pipelines and transmitters are ruled out, the issue lies in the selection of the appropriate model
I think the chances of blockage and leakage are relatively high; selecting the right model is a very important matter, and care is usually taken in this regard. The original poster might want to conduct a thorough check
84,000 corresponds to 20.8 mA, which is quite normal. It’s beyond the limit; if instrument faults are ruled out, it must be due to an inherent flaw in the selection process. Check if there is any blockage on the negative pressure side. Check whether the flow rate is 0 when the valve is closed. Check whether the instrument’s zero point and linearity are good.
If abnormal causes such as blockages and leaks are ruled out, the problem lies in the selection of the appropriate model, or changes in the process have led to an increase in flow rate that exceeds the range of the flow meter. It is recommended not to use throttling devices for measuring gas flow, as they are difficult to maintain and prone to frequent failures. Based on our experience, it is safer to choose a thermal gas mass flow meter.
We are manufacturers of thermal flowmeters. While thermal flowmeters are used for measuring gas flow, they have certain limitations: impurities tend to accumulate on the sensor elements, and regular maintenance is required. Another factor is the calibration capability of the manufacturer
Such a basic mistake should not occur when selecting a gas flow meter; the focus should be on checking the reasons for the over-limit condition. It is more likely due to blockage on the negative pressure side, or leakage.