Standard 173 defines a practical method for verifying how a leak detector can properly detect small and very small leak flow rates of chlorofluorocarbon (CFC), hydrochlorofluorocarbon (HCFC), hydrofluorocarbon (HFC), and perfluorocarbon (PFC) halogenated gases. Leak detection is necessary for all types of refrigerants and is part of the quality management of air-conditioning and refrigeration systems.<\/p>\n
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| 1<\/td>\n | ANSI\/ASHRAE Standard 173-2012 \n <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | FOREWORD 1. PURPOSE 2. SCOPE 3. DEFINITIONS 4. APPARATUS 4.1 Calibrated Leak Standard. The calibrated leak standard can be either adjustable or fixed flow rate. Testing will require calibrated leak flow rates of 1\u00b10.15 g\/yr, 50\u00b17.5 g\/ yr, and any number of calibrated leaks with flow rates between the nom… 4.2 Test Stand. The test stand will have a mobile platform to which the leak detector can be attached. The test stand will have a means for moving this platform laterally \u00b1200 mm at a controlled, constant speed over at least \u00b1180 mm of the travel (… <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | 5. AMBIENT CONDITIONS 6. TEST PROCEDURES 6.1 Test Number 1\u2014Sensitivity Threshold when the Leak Detector is Stationary. The stationary test involves a series of 10 repeat trials, starting with the 1 g\/yr leak, followed by another series of 10 repeat trials with an increase in the leak rate… Figure 1 Calibrated leak outlet with shroud and detector probe. <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | 6.2 Test Number 2\u2014Sensitivity Threshold When the Leak Detector is Moving. The moving test involves a series of repeat trials, starting with the 1 g\/yr calibrated leak, followed by another series of repeat trials with an increase in the leak rate (i… <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 6.3 Test Number 3\u2014Recovery Time Test. When a leak detector is exposed to a large leak, the sensor can become saturated by the refrigerant. After removing the leak detector from the leak site, the signal will return to zero after a period of time. T… Figure 2 Test apparatus, top view. Figure 3 Test apparatus, side view. <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 6.4 Test Number 4\u2014Sensitivity Threshold after Exposure to a Large Leak. When a leak detector is exposed to a large leak, the sensor can lose sensitivity after the recovery time even though the indication might lead the operator to believe otherwise… Figure 4 Test apparatus configured for Test Number 4. <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 6.5 Test Number 5\u2014Sensitivity Threshold in an Elevated Background. When a leak detector is being used in the vicinity of a large leak, it can lose sensitivity due to the elevated background. This test will determine if the leak detector sensitivity… Figure 5 Test apparatus configured for Test Number 5, top view. Figure 6 Test apparatus configured for Test Number 5, side view. <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 7. PRESENTATION OF TEST RESULTS <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INFORMATIVE ANNEX: TEST REPORT FORMS\u2014DETERMINATION OF THE PERFORMANCE OFHALOCARBON REFRIGERANT LEAK DETECTORSIN ACCORDANCE WITH ASHRAE STANDARDPROJECT COMMITTEE 173 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" ANSI\/ASHRAE Standard 173-2012 Method of Test to Determine the Performance of Halocarbon Refrigerant Leak Detectors<\/b><\/p>\n |