Liquid Level Sensors in an Integrated Controller Environment

Sept. 1, 2004
Conductive level sensing probes represent the latest in liquid level sensing technology, offering significant advantages over more traditional systems.

Conductive level sensing probes represent the latest in liquid level sensing technology, offering significant advantages over more traditional systems. Integrating the probe with a package lift station controller gives operators a standardized, reliable system that is reproducible and easy to specify.

The MultiTrode control system, used exclusively by Romtec Utilities as a component of its pre-engineered package submersible lift station, offers the advantages of a multi-sensor probe operating in an integrated controller environment.

The liquid level sensing system measures levels in the wet well basin in order to start and stop pumps and to initiate high level-low level alarms.

MultiTrode's patented conductive level sensing probe consists of a PVC tube assembly containing stainless steel sensors connected by wire to a pump controller. The probe, available with up to 25 sensors, is simply lowered into the wet well and suspended by its own cable using a supplied mounting kit. The probe measures liquid levels by monitoring resistance to ground. The extra-low sensing voltage, when combined with intrinsically safe barriers, meet explosion-proof standards set for wet wells.

The conductive level sensing probe is a completely electronic system that is unaffected by the build-up of fat, grease, debris and foam. The signal is sent from the sensors, through the cable to a pump controller located in the control panel. Other than output contacts, there are no mechanical aspects or calibration required. It's either wet or it's dry; it's either on or it's off.

Turbulence does not affect the probe's operation, and in fact, has a beneficial cleaning effect. The probe also ensures a positive pump cut-out: Pumps are turned off at the same level every single time, avoiding damage from pump over-run and the cost of additional control equipment.

Romtec Utilities offers a pre-engineered package submersible lift station.
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The conductive level sensing probe is connected to a standard interface that is easily manipulated by operators at any level of experience. At the electrical panel level, operators are able to choose their preferred level of sophistication across the entire lift station network, ranging from basic pump and alarm functions to full SCADA, with the ability to operate an entire network of lift stations from one desk.

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