Issue Date: April 18, 1997
Revision Date: May 23, 2011

Tidel Engineering, Inc.

Tidel Environmental Monitoring System, EMS 4000
(Ultrasonic Probe #312-9001)


Tidel Engineering, Inc. no longer manufactures or supports the use of this method.

Certification Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.1%. 
Leak Threshold 0.1 gph for leak rate of 0.2 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. 
Tank must be between 50 and 95% full.
Waiting Time Minimum of 2 hours, 23 minutes between delivery and testing. 
Minimum of 15 minutes between dispensing and testing. 
There must be no delivery during waiting time.
Test Period Minimum of 2 hours for leak rate of 0.2 gph. 
Test data are acquired and recorded by the microprocessor contained within the EMS console. 
Leak rate is calculated from data determined to be valid by statistical analysis. 
There must be no dispensing or delivery during test.
Temperature Average for product is determined from the measurement of the change in the speed of sound.
Water Sensor Must be used to detect water ingress. 
Minimum detectable water level in the tank is 1.045 inches. 
Minimum detectable water level change is 0.053 inch.
Calibration Gain adjustment on probe must be checked annually 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 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 system which routinely contains product. 
This is a shorter version of model #312-9000.


Tidel Engineering, Inc.

Evaluator:  Ken Wilcox Associates

2025 West Beltline Road, #114

Tel:  (816) 443-2494

Carrollton, TX  75006

Date of Evaluation:  03/16/95

Tel:  (800) 678-7577



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