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Submersible level sensors and transmitters make it very easy to measure the depth of water such as the level of the water tank, depth of a river or level of water in a borehole. The sensor is simply suspended by its strain-relieved cable to the bottom of the tank, borehole or river and it will measure the hydrostatic pressure created by the liquid above the sensor.
As a rough guide approximately 1m of water = 100mbar of pressure. This is then converted into an electrical signal used to calibrate an accurate level measurement in the water tank/river/reservoir/borehole.
Submersible level sensors and level transmitters are designed to make it simple to measure liquid depth in applications such as water tanks, rivers, reservoirs, and boreholes. Installation is straightforward: the sensor is suspended on its strain relieved cable to the required measuring point and it measures the hydrostatic pressure created by the liquid above it. As a practical guide, around 1 m of water is approximately 100 mbar of pressure, which is then converted into an electrical signal so you can calibrate an accurate level reading for your site.
These products sit within the wider level measurement range and are often chosen when you need reliable, continuous monitoring in environments where access is limited or where a fixed threaded installation is not practical.
Hydrostatic level measurement uses pressure at the sensor to determine the height of liquid above it. As the level rises or falls, the hydrostatic pressure changes proportionally and the transmitter converts that into a stable signal for logging, control, or telemetry. This approach is widely used because it offers consistent results even when vessel shapes vary, as long as the sensor position and calibration are correct.
Where a fixed mounting point suits the vessel design better, a threaded solution such as a screw in level transmitter can provide the same hydrostatic principle with a different installation method.
Choosing the right submersible level transmitter typically depends on:
RS485, HART, or i2cThe Stork range includes stainless steel probes for clean or lightly contaminated fluids, separable designs for maintainability, and plastic probes for more aggressive media. If you are deploying probes into remote monitoring systems, digital connectivity can be important for reliable telemetry integration, especially where long cable runs and stable communication protocols are needed.
Submersible level sensors are commonly used for:
For deployments focused on environmental monitoring and remote sites, the SLS-A submersible level transmitter is an example of a product positioned for applications such as rivers, reservoirs, and boreholes.
Submersible probes are one of several ways to measure level. For river monitoring installations that use mechanical level movement and low power telemetry, rotary encoder based level sensors can be a strong alternative. For projects where the installation point is best fixed into the side or base of a vessel, the screw in level transmitters range can offer a cleaner mechanical integration while still using the hydrostatic measurement principle.
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