Issue Date: February 13, 2015
Revision Date: January 22, 2022


8600 Series and 8601 Series Consoles Monitoring Systems with CSLD
(Model 8463 Magnetostrictive Probes)

(Continuous Automatic Tank Gauging)

Certification Leak rate of 0.2 gph with PD = 100% and PFA = 0%.
Leak Threshold

Leak Thresholds for Maximum tank capacity of 58,752 gallons and monthly maximum throughput of 1,538,015 gallons.

                                      Threshold      PD        PFA
 Single Tank Systems:           0.17          98.6%   <0.001%                                       
 Manifolded Tank Systems:    0.16          98.5%   <0.001%

A tank system should not be declared tight and a message printed for the operator, if the test results indicate a loss or gain that exceeds this threshold.


Gasoline, diesel, aviation fuel, fuel oil #4, solvents, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751, ethanol and ethanol-gasoline blends, and other liquids with known coefficients of thermal expansion and density maybe tested after consultation with the manufacturer.

Tank Capacity Maximum of 58,752 gallons for the leak thresholds shown above.
Maximum tank capacity listed is for single tanks and up to 3 tanks manifolded together.
The minimum product level required to a test is 15% full.
Throughput Monthly maximum of 1,538,015 gallons for leak thresholds shown above.
Waiting Time Less than 3 hours stabilization time is required between delivery and data collection.
Test Period Data collection time can range up to 28 days. The minimum requirement of qualified idle test time is 6 hours to make a leak rate estimate, with a maximum of 28 days in which to acquire it. The more qualified test time available the higher confidence the leak rate estimate.
Data sampling frequency is once per minute.
System collects data at naturally occurring product levels without interfering with normal tank operation, and discards data from unstable periods when system performs test.
Temperature Average for product is determined by a probe which contains 5 thermistors. At least two thermistors must be submerged in product during test.
Water Sensor

Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.75 inch.
Minimum detectable change in water level is 0.08 inch.

Calibration Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments System reports a leak rate and a "pass" or "fail" result.
System reports leak rates up to 5 gph as “fail” result. Leak rates from 7.5 – 10 gph as “no test”.
Evaluated using both single and manifolded tank systems with probes in each tank.
The maximum throughput evaluated for a tank system open 24 hours was 359,096 gallons.
The extreme climate factor setting has not been evaluated to determine the PD of a 0.2 gph leak rate.
For valid monthly testing, a conclusive test report must be produced for each tank every month.
System warns operator if there are no “ passing” tests completed during the month.
As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). 
Consistent testing or data collection at low levels could allow a leak to remain undetected.



Evaluator: Ken Wilcox Associates

125 Powder Forest Dr.

Tel:  (816) 443-2494

Simsbury, CT  06070-2003

Dates of Evaluation: 06/29/98 (Rev. 4/17/02) 10/26/07, 02/29/08(water sensor), 10/03/14, 04/07/2021

Tel:  (860) 651-2700






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