Issue Date:  August 10, 2001

Preferred Utilities Manufacturing Corporation

TG-EL-D3 Controller with HD-A1 Sensor



Output type:

qualitative, discriminating

Sampling frequency:


Operating principle:

optical sensor, electrical conductivity

Test Results:

unleaded gasoline




Detection time (sec)




Fall time (sec)




Lower detection limit (in)




Specificity Results:
Manufacturer claims the sensor responds to any liquid after the sensor’s threshold is exceeded.  The sensor display on the controller indicates whether product is oil or water.  No additional liquids tested.

Manufacturer’s Specifications:
Manufacturer states that the HD-A1 leak sensor used with the TG-EL-D3 controller and a tank level sensor (TG-EL-LF, TG-EL-VF, or TG-EL-WF) is a system that is generally applied to oil tanks for boilers and emergency generators. 

This system is NOT sold for retail gasoline station applications.
Manufacturer recommends a periodic test for the system by the user.  The test entails placing a magnet near the HD-A1 transmitter/sensor.  When the magnetic “Test Switch” is activated, it simulates an oil leak.  This completely tests the wiring to the sensor, the optical detector, the HD-A1 transmitter electronics, and the controller.


Preferred Utilities Manufacturing Corporation

Evaluator:  Ken Wilcox Associates

31-35 South Street

Tel:  (816) 443-2494

Danbury, CT 06810

Date of Evaluation:  10/12/00

Tel:  (203) 743-6741



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