Calibration Issues
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Differential Pressure Flow Meters Application Cautions for Differential Pressure Flow Meters Calibration Issues Be careful because the calibration of the differential pressure transmitter can be affected by the accumulation of liquid or gas in the impulse tubing. In addition, the accuracy of the flow measurement system can be degraded when varying amounts of liquid can accumulate during operation. Calibration issues can be important to the successful application of this technology. For example, differential pressure transmitter removal for calibration exposes the transmitter to multiple sources of potential problems that can affect the measurement, not the least of which is the extent to which the transmitter tubing is re-tightened after calibration. Calibration should generally be performed in-situ when possible and provisions to do so should be addressed during the design phase. For example, the differential pressure transmitter can be purchased with an integral valve manifold that allows easy calibration without disconnecting impulse tubing. |
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