SAE J2791:2019 pdf free

SAE J2791:2019 pdf free.HFC-134a Refrigerant Electronic Leak Detectors, Minimum Performance Criteria
The chamber shall have an access door large enough to insert a calibrated leak standard, a cylindrical sleeve or round-hole access point for a gastight syringe, and a built-in mixing fan (120 V, approximately 40 cfm) to circulate an injection of refrigerant gas to produce uniform distribution of injected gas for a contaminated atmosphere test.The chamber should have a provision for attaching a vacuum source (such as a small household vacuum motor) to permit rapid clearing of the chamber following a contaminated atmosphere test. The cylindrical sleeve or round-hole access shall include a sealing plug or other provision for sealing following use of the gas-tight syringe.The four calibrated leak standards used for the tests shall be calibrated per methods and instruments per the
National Institute of Standards and Technology, Washington, DC 20234, and the standards shall be rated accurate to within +20%. The leak rates shall be in common units -14 g/yr (0.5 oz/yr), 7 g/yr (0.25 oz/yr), 4 g/yr (0.15 oz/yr) and 2.0 g/yr (0.0625 oz/yr). The leak standards shall contain 100% HFC-134a. The standards or their mounting locations in the chamber shall ensure the base of the standard is 75 mm (3 in) or more from the floor of the chamber. This is to provide a sufficient drop for refrigerant coming from the leak standard orifice, to minimize refrigerant puddling around the orifice and/or orifice shroud if used. To mitigate testing inconsistency from possible air turbulence caused by the moving probe, the leak standards may be equipped (as a certification test option) with a shroud around the orifice port. The shroud protrusion from the orifice port shall be no more than 6 mm +0/-0.2 mm (0.236 in +0/-.01 in). A view of a sample configuration, with dimensions within those ranges is shown in the Appendix, as Figure A3. If a shroud is used with any leak standard, this shroud also must be used with all other leak standards for certification of a detector.SAE J2791 pdf download.