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Using a screw in or waterproof pressure transmitter to measure liquid level
8th November 2007
The first step in selecting a pressure transmitter for liquid level measurement is too determine whether to measure it by immersing the pressure transmitter or by mounting it externally to an outlet pipe or the wall of a storage tank.
Mounting a liquid level pressure transmitter externally is nearly always preferable because a screw in pressure transmitter is relatively cheaper than one that is immersed and it is also easier to service. If you are mounting a liquid level pressure transmitter externally, care should be taken not to install it onto pipes where there is likely to be a high flow of liquid or pump pressures since these may interfere with the hydrostatic pressure reading. Water proof pressure transmitters are used when it is not possible to provide access from the outside at the point you would like to measure the liquid level. For example there is no way to fit a pressure transmitter to the outside of a buried water storage tank without excavating the ground around it, so a waterproof pressure transmitter is the most economical solution.
Normally a manufacturer will clearly describe in the specification whether a pressure transmitter has an immersion option. In Europe there is a system for rating the level of water tightness which is Ingress Protection Rating or IP Rating. For immersion the pressure transmitter should be sealed to a rating of IP68 to at least the maximum depth that the instrument is capable of measuring.
Pressure Measurement Resource Links Convert a pressure unit Convert an altitude in feet or meters to a pressure unit Convert temperature units to and from degrees celsius, fahrenheit or kelvin Explain an IP rating for ingress protection Explanations for pressure measurement terms Create a pressure sensor specification
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