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<br />Instruction #: I2.5 <br />Rev 4/3/19 Page 2 <br />Note: The initial vacuum should be greater than 25 “Hg. <br />Gauges fitted with Quick Connect fittings will hold residual vacuum after disconnecting from the <br />canister. If you are using the same vacuum gauge to check vacuum levels of multiple canisters, <br />you may want to release this vacuum between readings. Using a 9/16” wrench, loosen the brass <br />nut located on the gauge. This will return the gauge to zero. Retighten the brass cap and the <br />gauge will be ready for the next vacuum check. <br />a. Confirm that valve is closed (knob should already be tightened clockwise). <br />b. Open and close valve quickly. <br />c. Record initial vacuum level (“Hg) on the Chain of Custody (COC). <br />d. If a shut-in test is required, monitor the vacuum reading per project requirements prior <br />to removal of brass cap <br />6) To begin sampling, remove the brass nut on the vacuum gauge using a 1/2” wrench to stabilize and <br />9/16” wrench to turn cap, as pictured below. <br /> <br />7) Open the canister valve counter clockwise no more than 1/2 turn to begin sampling. Attempts to <br />open the valve further can lead to valve damage and sample loss. <br />8) When sampling is complete, close the valve by hand-tightening clockwise, then record the final <br />vacuum (in “Hg) on the COC. Do not use tools to tighten valve. <br />Note: Aim for a final vacuum of 5”Hg. <br />9) Detach the gauge by pulling back the sleeve of the female QT fitting and lifting it upwards off of the <br />canister. <br />10) Finish filling out the COC. Write the serial # or barcode circled below from the base of the canister. <br />This number must be entered exactly as shown onto the COC to ensure no canister discrepancies <br />upon receipt by the lab.