Issue Date: November 22, 1995
Revision Date: May 19, 2009

OPW Fuel Management Systems
(originally listed as Emco Electronics, Tuthill Transfer Systems)

EECO System 1000, 1500, 2000, 3000 and Galaxy 0.2 gph Precision Test and Quick Test
(Q0400-4xx Magnetostrictive Probe or OPW 924/B TLM-B Magnetostrictive Probe)



Leak rate of 0.2 gph with PD = 99.1% and PFA = 0.9% for Precision Test using Q0400-4xxx probe.
Leak rate of 0.2 gph with PD = 95.4% and PFA = 4.6% for Quick Test using Q0400-4xxx probe.

Leak rate of 0.2 gph w/PD = 98.4% and PFA = 1.6% using 924/B TLM-B probe.

Leak Threshold 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, diesel, aviation fuel, fuel oil #4.
Tank Capacity Maximum of 15,000 gallons. Tanks less than 95% full may be tested. Minimum product level required based on tank diameter as follows:
48" dia/min 8.5"; 
64" dia/min 10.5"; 
72" dia/min 11.5"; 
96" dia/min 14";
126" dia/min 18". 
For other tank diameters, see evaluation report.
Waiting Time

From 1 to 6 hours between delivery and testing depending on tank conditions with Q0400-4xxx probe.

6 hours between delivery and testing with 924/B TLM-B probe.
None between dispensing and testing. 
There must be no delivery during waiting time.

Test Period

Average of 2 hours, 46 minutes using Q0400-4xxx probe during Precision Test evaluation. 
Average of 1 hour, 9 minutes using Q0400-4xxx probe during Quick Test evaluation. 

Test period of 4 hours using 924/B TLM-B probe.
Test data are acquired and recorded by a microprocessor which automatically determines test time based on tank size and product level. 
There must be no dispensing or delivery during test.

Temperature Probe contains 5 resistance temperature detectors (RTDs) (5 thermistors for 924B/TLM-B probe) to monitor average product temperature. 
At least one RTD must be submerged in product during test.
Water Sensor

Must be used to detect water ingress. 
Minimum detectable water level in the tank is 0.66 inches using Q0400-4xxx probe.. 
Minimum detectable change in water level is 0.039 inches using Q0400-4xxx probe.

Minimum detectable water level in the tank is 0.75 inches using 924/B TLM-B probe.

Minimum detectable change in water level is 0.08 inches using 924/B TLM-B probe.

Calibration RTDs (or thermistors) and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing. 
Tests only the portion of tank containing product. 
As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). 
Consistent testing at low levels could allow a leak to remain undetected. 
EPA leak detection regulations require testing of the portion of the tank which routinely contains product.


OPW Fuel Management Systems       

Evaluator:  Ken Wilcox Associates

6900 Santa Fe Dr.

Tel:  (816) 443-2494

Hodgkins, IL 60525

Dates of Evaluation:  12/23/93, 06/20/94

Tel: (708) 485-4200

08/17/95, 07/28/97, 11/17/99


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