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If you do not require a submersible level sensor or transmitter, you can simply screw these devices into the bottom or side of the tank/pipework by their threads and this will enable the sensor to measure the hydrostatic pressure created by the liquid above the sensor, approximately 1mWG is around 100mbar. We can use this pressure measurement to convert to a level reading.
For different density liquids, the specific gravity of the media can be considered for accurate level readings. Combining a screw-in level transmitter with a temperature sensor will allow you to dynamically adjust the specific gravity should the liquid have a specific profile that is followed when the temperature changes. We can take this temperature measurement and pressure measurement (level) into a dual-channel device such as the CMC-N16 and use the maths channels to create a true level measurement reading.
Please contact us for advice on your specific level measurement requirements.
A screw in level transmitter measures liquid level using the hydrostatic pressure created by the liquid column above the sensor. Instead of suspending a probe in the vessel, you install the device directly into the bottom or side of a tank or into pipework using its threaded process connection. As a practical guide, around 1 mWG is approximately 100 mbar, which can then be converted into a calibrated level reading based on your tank geometry and the liquid being measured.
Screw in devices are part of the broader level measurement range and are often selected when you want a clean, fixed installation point rather than a hanging sensor.
In a hydrostatic setup, the transmitter senses pressure at the installation point and translates that pressure into level. This approach works well for many liquids, but accuracy depends on matching the calibration to the liquid density. Where density varies, you can improve accuracy by compensating for specific gravity changes, especially in applications where temperature affects the liquid profile.
If your application suits a probe based approach rather than a fixed threaded connection, submersible level sensors and level transmitters can be a better fit for tanks, boreholes, reservoirs, and rivers.
For liquids with a density that differs from water, specific gravity needs to be considered for accurate conversion from pressure to level. In systems where the liquid density changes with temperature, pairing a screw in level transmitter with temperature measurement allows dynamic compensation, so the level reading remains representative of the true liquid height.
This is particularly relevant in process applications where fluids are heated, cooled, or subject to seasonal variation, and it is one of the key reasons hydrostatic systems are often engineered as part of a complete measurement chain rather than treated as a standalone sensor.
A good selection process typically starts with:
4-20 mA or digital communications depending on your system architectureFor example, the LMK 331 screw in level transmitter is designed for level and process measurement across liquids, oils, and gases, including use in more viscous or polluted media due to its semi flush sensor design. Where compact installations are important, the LMK 351 screw in level transmitter is positioned for precise pressure and level measurement in smaller container based systems.
Screw in level transmitters sit alongside other hydrostatic approaches within the Stork range. If you are comparing installation methods across different sites or vessel types, it is often useful to review the full level measurement portfolio, including rotary encoder level sensors for river level monitoring and probe based submersible level sensors and level transmitters for suspended installations.
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