Issue Date: November 22, 1995
Revision Date: April 18, 1997
FDR Services, Inc.
GasPak Vapor Monitoring System
Out-of-Tank Product Detector (Vapor-Phase)
Detector
| Output Type | Quantitative |
|---|---|
| Sampling Frequency | Intermittent |
| Operating Principle | Product permeable detector |
*California regulations require vadose zone vapor monitoring to be continuous. This sensor does not meet the criteria.
Test Results (averages of multiple concentrations)
| Benzene | Heptane, 3-methy |
Hexane | Iso-octane | |
|---|---|---|---|---|
| Accuracy (%) | 103 | 102 | 107 | 103 |
| Bias (%) | -1 | 1 | 2 | 1 |
| Precision (%) | 2 | 2 | 4 | 3 |
| Lower detection limit (ppm) | 1 | 1 | 1 | 1 |
| Specificity (%) | 100 | 100 | 102 | 101 |
| Pentane, 2,4-dimethyl |
Pentane, 2,3,4-trimethyl |
Toluene | M-xylene | |
|---|---|---|---|---|
| Accuracy (%) | 105 | 104 | 104 | 99 |
| Bias (%) | 1 | 1 | 1 | -6 |
| Precision (%) | 3 | 3 | 3 | 4 |
| Lower detection limit (ppm) | 3 | 1 | 1 | 4 |
| Specificity (%) | 101 | 100 | 100 | 94 |
Specificity Results
See results above.
Comments
Detection times were not directly measured. However, evaluator states, "experiential evidence predicts that the detector response will reach 'alarm' conditions (30% of maximum fresh fuel response) at a distance of 5 meters in slightly over one day."
Each cartridge is used once, then replaced by another.
GasPak is produced and analyzed by Fayette Environmental Services, Inc., with exclusive marketing and implementation rights assigned to FDR Services, Inc.
- FDR Services, Inc.
219 North Main St., Suite 202
Bryan, TX 77803
Tel: (800) 337-5325 - Evaluator: David G. Bray, Ph.D.
University of Missouri - Columbia
Tel: (573) 882-2439
Date of Evaluation: 07/27/94
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