VV-L-825C APPENDIX
50.2 The sealed tube shall be placed in the tube-opening apparatus and connected to the gas handling system, leaving the connecting valve open. Each
valve in the gas handling system, except the vacuum pump valve, shall be closed. Then the system shall be evacuated to the limit of the vacuum pump (approximately 1 millimeter mercury). The pump shall be isolated from the rest of the system.
50.3 The valve on the tube-opening apparatus shall be closed. Then the tip of the sealed tube shall be broken off by a sideways motion of the tube. The sample tube shall then be submerged in a beaker of hot water to thaw the contents.
50.4 The valve on the tube-opening apparatus shall be opened slowly to allow approximately 1 atmosphere of gas to escape into the gas handling system. The valve shall then be closed. The gas sample valve shall then be opened, and a 5 mL gas sample shall be injected into the gas chromatograph.
50.5 Using an electronic integrator or planimeter, the peak areas for R-22 and R-
12 refrigerants shall be determined on the gas chromatogram. (Other peaks on the chromatogram should be ignored.)
60. CALCULATIONS
60.1 The percent of R-22 in the gas sample shall be calculated using the following formula:
R-22, volume percent = AR-22 x 100 AR-12 + AR-22
Where:
AR-22 = R-22 peak area
AR-12 = R-12 peak area
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