Float operated liquid level switch

September 2003 Operator Interfaces, Switches & Relays

The Mobrey M-Switch, with small in-tank dimensions for simple liquid level alarm associated with traditional high reliability switching, is available in either weatherproof or flameproof models. Supplied in southern Africa by Dupleix Liquid Meters (DLM), the M-Switch comes in flanged or threaded mounting with a tough industrial build quality.

Manufactured in 316 stainless steel throughout, the M-Switch is available for side mounting with either a flange or 2" thread. Comprising of a small float on the wetside and a body containing a high current micro-switch on the dryside, the Mobrey M-Switch will reliably detect liquid level to give a voltage free contact operation for alarm signalling or as a pump control system.

One permanent magnet forms part of a float assembly that rises and falls with changing liquid level. A second permanent magnet is positioned within the switch so that the adjacent poles of the two magnets repel each other through the non-magnetic wall of the switch body. A change of liquid level which moves the float through its permissible travel will cause the float magnet to move and repel the switch magnet to give snap-action operation of the micro-switch contacts.

The M-Switch is designed for side mounting either direct into a vessel or in an external chamber. Choose a position where the effects of turbulence caused by agitators or inlets are minimised. The switch should be positioned so that the float may move freely over its full travel and not foul the sides, bottom or top of the tank. A flange or threaded boss is recommended for pressurised applications, designed such that the float is free to move over its full travel.

For more information contact Dave Rosser, DLM, 011 457 0500, [email protected], www.dlm.co.za

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