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<br />Instruction #: I2.5 <br />Rev 4/3/19 Page 5 <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 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) Attach all tubing, fittings, and/or purge cans to flow controller, if necessary. <br />7) To begin sampling, remove the brass nut on the flow controller using a 1/2” wrench to stabilize <br />and 9/16” wrench to turn cap, as pictured below. <br /> <br />8) 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. Each flow controller has been <br />set to a predetermined flow rate. <br />9) When sampling is complete, record the final vacuum (in “Hg) on the COC and then close valve by <br />hand tightening clockwise. Do not use tools to tighten valve. <br />Note: Aim for a final vacuum of 5”Hg. <br />10) Detach flow controller by pulling back the sleeve of the female QT fitting to release the seal. <br />Uncoupled QT fittings act as a closed valve and will not allow air flow. Lift the flow controller off of <br />the canister. <br />11) 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.