Low-cost level switch

August 2005 Operator Interfaces, Switches & Relays

Kab is offering Tilt Switch, which is a simple level switch designed for use in high level detection. It contains a robust mercury tilt switch in a 2 mm thick steel tube. The tilt switch is fully potted to stop moisture from entering the device.

The angle of the device is set at 15° and it will tilt in any direction. It is designed for installation in silos to detect a high level. The instrument normally hangs down in the silo using its own weight to stop the device from switching. It is in a normally closed state when hanging down because the two contacts are covered with the mercury. When the material rises, it causes the mercury in the switch to move away from one of the contacts creating an open circuit.

The switch can be connected to a PLC, directly to a motor or connected to the Tilt Master, a microprocessor-based control unit. Its relay contact has a rating of 250 V a.c. up to 8 A. The design incorporates a delay and a hold circuit to eliminate spurious switching and a set of LEDs indicate the power, tilt and the relay response. The Delay and Hold timers are adjusted by means of two potentiometers. There is also a link to provide a high or low failsafe condition.

For more information contact KAB Instruments, 011 435 5380, [email protected], www.kabinstruments.com

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