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[August 2001]
ABLE Introduce New Hazardous Area Liquid Level Switch
ABLE have designed a new rugged compact ultrasonic gap switch which is said to be a reliable and economical alternative to mechanical floats, tuning forks, conductivity and capacitance switches. A combination of analogue and PNP outputs provides flexibility when interfacing with analogue receiver packages or PLC, DCS and SCADA control systems. The ABLE GS Series use two piezo electric crystals located on either side of the sensor gap. The crystals are used to detect the absence or presence of a liquid. One crystal emits a high frequency sound wave, and the second crystal receives the signal. When air is present between the sensor gap, the emitted sound wave is attenuated and is not received by the crystal on the opposite side of the gap. When a liquid is present, the sound wave emitted by the first crystal is transmitted through the gap and received by the second crystal. The circuitry uses the information produced by the sensor to cause a change in the output current and the PNP output. Green and Red LEDs provide local status indication.
The GS Series has been designed to take the worry out of specifying level switches. A rugged 316 SS sensor and housing construction, an ability to satisfy most applications and a low purchase cost are said to make it an ideal unit to be held in stores. Installation is equally as simple with no calibration or switch point adjustment requirements; set-up can be achieved in fewer than five minutes. Unlike most level controls, adjustments due to process material changes are not necessary because the GS Series is unaffected by changes in dielectric, conductivity or density.
Also, no moving parts to wear ensures no maintenance and reliable long-term service. In addition ABLE have incorporated a magnet-activated solid state switch feature which initiates a loop confidence test ensuring the integrity of not just the GS Series level switch but the entire loop. The use of surface mount and solid state technology has allowed units to be of an extremely compact design making the GS Series ideal for applications that have limited clearance, space or weight limitations. As such the GS Series is claimed to be the ideal solution for numerous industries and applications including pharmaceuticals, oils, lubricants, ink trays, clean liquids, automotive, light slurries, acids, caustics, petroleum products, water and wastewater.
Web site: http://www.able.co.uk
ENDS