Issue Date: March 11, 2011

Preferred Utilities Manufacturing corporation

TG-EL-D4A Fuel Sentry Control Unit, HD-A2-C Optical Discriminating Sensor



Output type:


Sampling frequency:


Operating principle:

optical sensor


Test Results:

unleaded gasoline  



Detection time (sec)




Fall time (sec)




Lower detection limit (in)





Control panel
  Six intrinsically safe sensor inputs can be used for level indication and/or leak detection.

Provides audible and visual alarms.

Sensor:  Primarily designed for use with diesel fuel and other distillates but can be used with other fluids - see manufacturer for specific limitations.

*This evaluation determined the sensors' responses to the liquids shown above.  Biodiesel blends B6-B20 meeting ASTM D7467 and biodiesel B100 meeting ASTM D6751 would also produce an alarm if the sensor threshold is exceeded.  Responses to these fuels were not determined, but would be expected to be very similar to the diesel responses.

Used to detect the presence of liquids in fiberglass and steel tank annular spaces or the presence of liquids in tank vault spaces.

Can also be used for detection of leaks into sumps or other containment vessels used to collect liquids.


Preferred Utilities Manufacturing Corporation

Evaluator:  Ken Wilcox Associates

31-35 South Street

Tel:  (816) 443-2494

Danbury, CT  06810

Dates of Evaluation:  06/17/10

Tel:  (203) 743-6741



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