Liquid Level Transmitter: How Hydrostatic Level Measurement Works

Liquid Level Transmitter is an industrial sensor used to measure liquid level continuously and in real time. On Fortuna Argatech’s official website, it is described as a hydrostatic liquid level transmitter with 4-20mA and RS485 output, plus IP68 submersible design.

This type of sensor is useful when you need stable level readings for water, tanks, wells, reservoirs, or rivers.

What is a Liquid Level Transmitter?

A Liquid Level Transmitter measures the pressure created by a liquid column and converts it into a level value.

Because it works on hydrostatic pressure, it is a good fit for continuous level monitoring where stable readings matter.

How a Liquid Level Transmitter works

The sensor measures liquid pressure

The pressure element reads the static pressure from the liquid.

Pressure is converted into level

Because pressure increases with depth, the system can calculate the water level from that pressure value.

Data goes to the control system

The measurement is sent as a standard signal that PLC, SCADA, or DCS can read.

Monitoring becomes easier

The data can support dashboards, alarms, and historical recording.

Key specs published by Argatech

Argatech’s product page, published on March 2, 2026, lists hydrostatic pressure as the measurement principle, 4-20mA DC and RS485 Modbus output, 12-36VDC power supply, IP68 submersible protection, and use in tanks, rivers, wells, sumps, and reservoirs. (Fortuna Argatech, Liquid Level Transmitter, March 2, 2026, https://argatech.com/sensor/liquid-level-transmitter/)

Main details include:

• measurement principle: hydrostatic pressure
• output: 4-20mA DC, RS485 Modbus
• power supply: typically 12-36VDC
• accuracy: +/-0.1% / +/-0.25% / +/-0.5%
• protective rating: IP68 submersible
• cable length: up to 75 m
• operating temperature: -20 to +80 C
• medium compatibility: water, compatible liquids
• output interfaces: PLC, SCADA, DCS compatible

When should you choose it?

This sensor is a good choice when you need stable readings and do not want to rely on a non-contact sensor.

Typical use cases:

• water storage tanks
• wells and reservoirs
• rivers and channels
• sumps or collecting pits
• environmental and industrial monitoring systems

Liquid Level Transmitter vs Radar Level Meter

Compared with radar, a hydrostatic transmitter measures level from liquid pressure rather than wave reflection.

Radar is better for non-contact measurement. A Liquid Level Transmitter is a better fit when submersible installation and pressure-based measurement are more practical.

For comparison, Argatech also offers Radar Level Meter for non-contact level measurement.

Main benefits

• continuous real-time readings
• suitable for submersible applications
• easy industrial integration
• multiple accuracy options
• useful across many water monitoring points

Conclusion

A Liquid Level Transmitter is a practical choice for hydrostatic liquid level measurement. For tanks, rivers, and reservoirs, it provides stable data that can be connected to control systems.

FAQ

Sources

• Fortuna Argatech. (March 2, 2026). Liquid Level Transmitter – Fortuna Argatech. https://argatech.com/sensor/liquid-level-transmitter/
• Fortuna Argatech. (no date). Radar Level Meter – Fortuna Argatech. https://argatech.com/sensor/radar-level-meter/