Hawker Electronics FLEXICAP variable capacitance systems

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Where liquids are non-conducting or where there are free-flowing powders, Hawker Electronics can offer a capacitance detection system that detects the presence of the media to be monitored; this can be a point level for on/off control, alarms or a continuous level measurement. The company’s FLEXICAP variable capacitance systems with Flexilevel wall-mounted unit and cable probe lengths with length over 3 m and up to 13 m are available.

A capacitance probe works in two ways: with conducting liquids and non-conducting liquids. The capacitance principle uses two detector plates and one insulator. By changing one of the factors, the user can measure its change and give a continuous output signal.

For conducting liquids, an insulated cable with a stainless steel conductor is used. As the conducting liquid rises and falls in the tank, the change is detected and an output signal is produced.

For non-conducting liquids, two concentric or parallel rods are used and the non-conducting liquid rises and falls within the orifice or gap. The change is detected and an output signal produced.

The system enables the user to measure to the top of the tank and it is unaffected by foam or turbulence. Probe length must be decided in advance for accurate measurement.

The probe will give a signal over its length and it will be detected by the controller. The controller will give digital indication, four programmable trip points and a diagnostic trip point to detect cable break and short circuit between the controller and the probe.