UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: March 10, 2000

PermAlert

PAL-AT Models AT20C, AT50C, AT40K with AGW Sensor Cable, TFH Hydrocarbon Sensor Cable

OUT-OF-TANK PRODUCT DETECTOR (LIQUID-PHASE)

Detector:

Output type	qualitative
Sampling frequency	continuous
Operating principle	impedance change

Test Results:

	unleaded gasoline
AGW Sensor Cable	1/3 MER* 1348 ft.	2/3 MER 2644 ft.	MER 3982 ft.
Response time (min)	9.92	6.25	21.28
Recovery time (min)	1.0	1.0	1.0
Product activation height (cm)	2.03	1.13	5.00
Detection length (cm)	116.3	64.8	286.1
Lower detection limits (cm)
Product activation height	N/D*	N/D	5.1
Detection length	N/D	N/D	295.6
TFH Hydrocarbon Sensor Cable **	1/3 MER 1368 ft.	2/3 MER 2685 ft.	MER 4046 ft.
Response time (min)	3.40	7.48	16.21
Product activation height (cm)	0.65	1.33	3.53
Detection length (cm)	27.7	56.8	150.4
Lower detection limits (cm)
Product activation height	N/D	N/D	3.
Detection length	N/D	N/D	152.9

* See glossary.

Specificity Results (in addition to above):
Activated: synthetic gasoline, diesel, heating oil #2, water (AGW Sensor Cable only).

Comments:
System can monitor interstitial spaces.
Evaluations also covered quantitative leak location.
AGW Sensor Cable is reusable.
TFH Hydrocarbon Sensor Cable is not reusable.
Lower detection limit is calculated at MER only. Cable is assumed to be equally or more sensitive at shorter lengths.

** California regulations require sensors to be tested annually to verify proper operation. The detector is not reusable and must be replaced after contact with hydrocarbons.

PermAlert	Evaluator: Carnegie Mellon Research Institute
7720 N. Lehigh Ave.	Tel: (412) 268-3495
Niles, IL 60714-3491	Date of Evaluation: 01/17/92, 02/11/92
Tel: (847) 966-2235

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