Components
A level gauge is a sensor-based device that measures the height of a liquid in a closed or open system continuously or at points. The measurements are often used to control the start and stop of pumps, provide high or low level alarms, or log data for monitoring and documentation.
In many bypass pumpings and wastewater installations, the level gauge is the heart of the control system – it ensures that the pump only runs when needed and protects against dry running or flooding.
There are several technologies available for level measurement – the choice depends on the medium, environment and accuracy requirements:
Pressure sensors measure the liquid column using hydrostatic pressure
Ultrasonic meters send sound signals down towards the liquid surface and measure the reflection time
Radar works like ultrasound, but with higher precision and resistance to steam and condensation
Floats are used for simple level signal (on/off)
Data from the level gauge is typically sent to a controller or SRO system that controls the operation of the pump.
Automate pump control and operation
Prevents overflows and downtime
Allows for remote monitoring and alerting
Reduces energy consumption and pump wear
Adaptable to aggressive or impure media
Pumping stations and wells in the wastewater network
Bypass pumping during sewer renovation
Rainwater basins and sludge tanks
Industrial process plants
Groundwater monitoring and drain pumping
Level meters come in many versions depending on the application and environment:
Enclosures: Stainless steel, plastic, acid-proof steel (for aggressive liquids)
Mounting: Submerged sensors, top-mounted radar/ultrasound, wall mounting
Output: Analog (4-20 mA), digital (Modbus, relay), wireless transmission
Additional features: Built-in data logger, self-calibration, ATEX approval
