How to adjust a double-flange differential pressure level gauge when its measurements are inaccurate
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This post was last edited by FightingNow on 2015-6-13 20:46. 1. When the reading of the double-flange level gauge does not match that of the on-site magnetic flip gauge (which is accurate), how should the instrument be adjusted and calibrated? Could you explain it in more detail, please? 2. What about a differential pressure level gauge? How should it be adjusted? I’m quite slow to understand things; please provide detailed explanations, as detailed as possible. Once you understand it, it will be easier from then on. Right! Otherwise, I keep getting stuck on trivial details and can’t figure things out. I seek advice, please! Masters, come quickly!
1. Select the reference points for both. 2. Calculate the height corresponding to the differential pressure value based on the density of the medium
For the owner’s level gauge & transmitter, is the height at the bottom of the equipment the same? What about the height of the opening?
Since the magnetic flip plate is accurate, just match this parameter with that of the magnetic flip plate. There are many reasons for inaccurate readings with double-flange level gauges, such as damaged diaphragms, incorrect parameter settings, and clogged pressure transfer pipes
Measure the height of the liquid level as detected by the transmitter; for accuracy, also measure the temperature of the medium. Then use the formula hρg to calculate the accurate range. Calibrate the transmitter using standard instruments based on this range, selecting 5 points (0%, 25%, 50%, 75%, 100%). Once that is done, simply install it – it’s that simple. Be sure to rinse the pressure tube before installation...
The differential pressure transmitter is used to measure liquid level and density; large temperature changes, or errors in the density data used in calculations, can all lead to deviations in the liquid level reading
Close the valve, loosen the flange screws, expose the diaphragm to the atmosphere, and use a manual operator to perform a 0-point adjustment (the pressure at this point serves as the zero point, which is also the lower limit of the measurement range). Then reattach the flange, open the valve, and adjust the upper limit of the measurement range using the magnetic flip-level gauge until the two values match.