The first step in selecting a pressure transmitter for liquid level measurement is to determine whether to submerge or mount the sensor externally.
Mounting a liquid level pressure transmitter externally is nearly always preferable because a screw in pressure transmitter is normally cheaper than one that is immersed, and is 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.
Featured screw-in liquid level pressure transmitter products
Measuring fuel and water tank levels on ferries with a hydrostatic transmitter - Marine certified level sensors for ferry onboard fuel, water, and sewage tanks up to 2.4 meters
Canola oil tank hygienic level sensor & indicator with high temperature protection - Instrument for measuring the level of a used Canola oil tank, and tolerate temperatures of up to 190 degrees Celsius.
Waterproof 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 the Ingress Protection Rating or more commonly known as the IP Rating. For immersion the pressure transmitter should be sealed to a rating of IP68. If it is not clearly marked in the literature you should clarify with the manufacturer for what depth and duration it can be submerged.
Featured waterproof liquid level pressure transmitter products
LMK807 Plastic Submersible Level Transmitter - IP68 mid range pressure transmitter for measuring the level of highly contaminated and aggressive liquid media with a body made from PP-HT.
Wash water break tank submersible level transducer with 1.6 m range and 4-20mA output - Monitor wash water levels in break tanks with this submersible 4-20mA transducer. Features high accuracy, 5m vented cable, and robust design.
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