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-2- <br /> 4.2 Introduction of gaseous nitrogen into the system at flow rates exceeding 4 <br /> CFM (240 CFH) may bias the results of the test toward non-compliance. Only <br /> gaseous nitrogen shall be used to conduct this test. <br /> 4.3 Pressurizing the Clean Air Separator bladder greater than 14.00" we could <br /> damage the bladder, biasing the test toward non-compliance. <br /> 4.4 Thermal Bias for Electronic Manometers <br /> Electronic manometers shall have a warm-up period of at least 15 minutes <br /> followed by a drift check of 5 minutes. If the drift exceeds 0.01" wc, the <br /> instrument should not be used. <br /> 5 APPARATUS <br /> 5.1 Nitrogen <br /> Use commercial grade gaseous nitrogen in a high pressure cylinder, equipped <br /> with a two-stage pressure regulator. <br /> 5.2 Pressure Measurement Device <br /> Use an electronic pressure measurement device to monitor the pressure decay in <br /> the Clean Air Separator. The pressure measurement device shall, at a minimum, <br /> be readable to the nearest 0.01" wc. <br /> 5.3 Test Port Assembly <br /> Use a test port assembly constructed similar to the one in Figure A. The <br /> assembly should have an 8 oz. Pressure Relief valve, to ensure that the Clean <br /> Air Separator is not over pressurized. The Model 9968 Clean Air Separator Test <br /> Port Assembly can be purchased from Healy Systems, Inc. <br /> Healy Clean Air Separator Test Procedure, Exhibit 4—Executive Orders VR-201-D and VR-202-0 <br />