Issue Date: November 14, 1997
Revision Date: October 18, 2002
OPW Fuel Management Systems
(originally listed as Emco Electronics, Tuthill Transfer Systems)
EECO 1500, 2000, 3000 Systems Q0003-001 Discriminating Dispenser Pan Sensor, Q0003-002 Discriminating STP Sump Sensor, Q0003-003 Discriminating Interstitial Sensor, Q0003-006 Liquid Only Interstitial Sensor, Q0003-009 Liquid Float Sensor
Interstitial Detector (Liquid-Phase)
Detector
| Output Type | Qualitative |
|---|---|
| Sampling Frequency | Continuous |
| Operating Principle | Float switch and polymer strip (Q0003-001, Q0003-002), optical prism and conductivity (Q0003-003), optical prism (Q0003-006), float switch (Q0003-009) |
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 Q0003-001 and Q0003-002: Currently the SWRCB UST Program staff discourages the use of polymer strip discriminating sensors at new installations in California. This is due to concerns about the impact that repeated/prolonged exposure to hydrocarbons may have on the sensor's ability to alarm and recover from alarm reliably. Since current evaluation protocols do not address this issue, no new polymer strip sensors should be installed until new evaluation protocols are in place.
Model Q0003-003: 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 | ||||
|---|---|---|---|---|---|---|
| High* | Low* | High | Low | High | Low | |
| Q0003-001 Discriminating Dispenser Pan Sensor (float switch, polymer strip) | ||||||
| Lower detection limit (cm) | 19.91 | 3.38 | 19.86 | 3.30 | 19.66 | 3.20 |
| Detection time (sec) | 1-24hr | 1-24hr | <1 | <1 | <1 | <1 |
| Fall time (sec) | clean | clean | clean | clean | <1 | <1 | Q0003-002 Discriminating STP Sump Sensor (float switch, polymer strip) |
| Lower detection limit (cm) | 28.37 | 3.12 | 28.24 | 3.07 | 28.04 | 3.00 |
| Detection time (sec) | 1-24hr | 1-24hr | <1 | <1 | <1 | <1 |
| Fall time (sec) | clean | clean | clean | clean | <1 | <1 | Q0003-003 Discriminating Interstitial Sensor (optical prism, conductivity) |
| Lower detection limit (cm) | 1.68 | 1.68 | 1.85 | |||
| Detection time (hr) | <1 | <1 | <1 | |||
| Fall time (sec) | <1 | <1 | <1 | Q0003-006 Liquid Only Interstitial Sensor (optical prism) | ||
| Lower detection limit (cm) | 1.35 | 1.55 | 1.78 | |||
| Detection time (hr) | <1 | <1 | <1 | |||
| Fall time (sec) | <1 | <1 | <1 | Q0003-009 Liquid Float Sensor (float switch) | ||
| Lower detection limit (cm) | 2.54 | 2.49 | 2.21 | |||
| Detection time (hr) | <1 | <1 | <1 | |||
| Fall time (sec) | <1 | <1 | <1 | |||
*The "high" and "low" refer to high and low level alarm points of hydrostatic sensors.
Specificity Results
Evaluator claims sensors will respond to any liquid.
Comments
Q0003-001 and Q0003-002 sensors must be cleaned with rubbing alcohol, or dish soap and water after exposure to product.
Sensors are reusable if not completely saturated with product.
- OPW Fuel Management Systems
6900 Santa Fe Dr.
Hodgkins, IL 60525
Tel: (708) 485-4200
URL: www.opwglobal.com/opw-fms - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Dates of Evaluation: 10/18/96
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