Issue Date: August 10, 2001
Preferred Utilities Manufacturing Corporation
TG-EL-D3 Controller with HD-A1 Sensor
Interstitial Detector (Liquid-Phase)
Detector
| Output Type | Qualitative, discriminating |
|---|---|
| Sampling Frequency | Continuous |
| Operating Principle | Optical sensor, electrical conductivity |
Test Results
California requires annual certification of all leak detection equipment. The certification of discriminating sensors should include functional testing of both water and product detection capabilities.
Model HD-A1: This sensor can only respond to liquid directly in contact with the detection element, and is unable to detect a product release floating on an existing pool of water whose height exceeds the level of the detection element.
| Unleaded Gasoline | Diesel | Water | |
|---|---|---|---|
| Detection time (sec) | <1 | <1 | <1 |
| Fall time (sec) | <1 | <1 | <1 |
| Lower detection limit (in) | 0.179 | 0.162 | 0.190 |
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.
Comments
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
31-35 South Street
Danbury, CT 06810
Tel: (203) 743-6741 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 10/12/00
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