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The LM80 Lasermeter level transmitter, supplied by Allison Engineering, can be used to measure the sewage level in ‘wet well’ applications.

Sewage pumping stations are used by waste water utility companies to transport raw sewage from residential and commercial areas to the central treatment works.

The waste is collected in a ‘wet well’, which can be up to 80m deep.

The measurement of the sewage level is critical in order to control the operation of the very large pumps, submerged at the bottom of the well and used to empty the well and transport the sewage to the next collection point.

Until now, the only options have been pressure transmitters, which are notoriously unreliable and become less accurate as the level drops, or ultrasonic transmitters.

Ultrasonic devices emit a beam that quickly increases in diameter, which inevitably results in ‘false echoes’ from the wall of the well and are unable to measure the level once it drops below the pumps themselves.

The LM80 level transmitter can provide a solution to these problems.

Its laser is a very high frequency, narrow wavelength, optical device with a beam width of no more than 5cm at a range of 30m.

This means the laser can be targeted at a specific area, avoiding the pumps and providing accurate and reliable level control.

The LM80 provides a 4-20mA analogue output together with two relay outputs to start and stop the pumps.

LM80 Lasermeter transmitters can be mounted in any orientation and operate effectively even if a glass or plastic shield is required for protection against aggressive or pressurised applications.

In addition to deep, wet well applications, the LM80 transmitters can be installed on tanks, silos, hoppers, bins and mixing basins as well as in other industrial applications involving media such as coal and plastic pellets.

Allison Engineering

Allison Engineering Ltd has been established for 30 years and specializes in the supply of high quality process instrumentation and safety related equipment. Markets served include Oil, Gas and Petrochem, Water & Waste, Environmental, Power, Pharmaceutical and Automotive.


We supply an extensive range of flow and level products, such as Thermal Gas Mass Flow Transmitters, Thermal Flow & Level Switches, Flow conditioners, Magnetostrictive Level, Guided Wave Radar, Laser level transmitters and Magnetic Level Gauges.


More recently our range has extended with the addition of specialised safety products, such as safety shields that prevent pipeline spray-outs, acid detection paint and Tuneable Laser Gas Detection products. We are proud of our reputation of being able to solve ‘difficult’ process problems by offering non-competing, alternative, state-of-the-art technologies. This means we can guarantee product knowledge, application knowledge as well as competition knowledge.

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