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Ultrasonic Gap Switches

 

Here's how they work...
LEVELMARK™ Ultrasonic Gap Switches use proven, reliable ultrasonic technology. The Levelmark control unit transmits an inaudible acoustic signal across the gap in the sensing element. When the gap is not filled with a liquid the signal strength decreases. When liquid fills the gap the across-gap signal increases. The signal crosses the gap which causes the state of the output device to be changed.

LEVELMARK™ Ultrasonic Gap Switches are specially suited for your difficult applications. The effect of ambient noise is eliminated by the use of frequency selective circuits. This rules out a major cause of false alarms. These circuits also allow a higher in-band signal to be generated with less power than is normally required. You get highly effective sensitivity without using expensive very high signal-to-noise (S/N) ratio sensing elements.

Output Flexibility
LEVELMARK™ Ultrasonic Gap Switches are available with a variety of output options to meet your process control needs. For optimum safety, and peace of mind, a 4-20 mA loop output, divided into current windows, allows for intrinsically safe connections. A second option is the optoisolated, open collector transistor, output. This option provides a "bounceless" solid state switch closure.  These switches can be used with Distributed Control Systems (DCS) or Programmable Logic Controllers (PLC) without costly "de-bouncers" or signal conditioners. A relay contact closure option is also available.

Features: Benefits of ownership:
FM and CSA explosion-proof approvals on all models; intrinsically safe models also available  Peace of mind
No external latching relay is required for pump control on dual point models Simplify installation
Manual self-test Simplifies unit testing
Factory pre-calibrated for most applications Fast, easy installation
All welded construction sensing elements Eliminates leaky seals-no maintenance 
No moving parts No routine maintenance
Accuracy to 1/16" Tighten your process controls cost effectively

If you require... Ask for...
Type Output Instrument
Single-point Optoisolator or Relay  Model 614
Dual-point Optoisolator or Relay  Model 616
Single-point 4-20mA loop Model 624
Dual-point 4-20mA loop Model 626

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