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
Hydrostatic level sensor for 7m high tanks with 4-20mA plus HART coms - HART-enabled hydrostatic level sensor for accurate and reliable level measurement in tanks and vessels. Features ATEX Intrinsic Safety, 0 to 7 mH2O range, and remote calibration via HART communication.
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
Submersible rainwater tank level sensor for measuring 3.5m depth - Low budget price rainwater level sensor with 3.5 metres maximum water depth (0.35 bar), 4-20mA output, 15 volt supply, and typical 0.5% accuracy
18.605 G Low Cost Submersible Diesel Fuel and Water Tank Level Sensor - Low cost OEM diesel fuel or water level sensor for installing inside or outside a storage tank.
Related Help Guides
- Determining the hydrostatic pressure range for a tank level sensor
- Measuring liquid level in a sealed tank with a hydrostatic pressure sensor
- Difference between vented and non-vented water level measurement
- Determining water tank volume using hydrostatic pressure
- Measuring the volume of liquid in a horizontal cylinder tank
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