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Section 3 continued Section 3 continued <br /> LOW FLOW SAMPLING (5 to 800 cc/min.) Bubbler and Impingers Sampling <br /> CALM fAf Q <br /> o. ..o - .. <br /> SETUP: <br /> Using the setup as shown above, flows of 5 to 800 cc/min. may be Wm <br /> collected in adsorbent tubes(charcoal,silica gel,etc.).Caution:first set up O e O a <br /> sorbent tube in Tube Holder with proper tubing before turning pump on. <br /> Low Flow Sampling Procedure: CAUTION: FIRST SET THE FLOW WITHOUT SOLUTION l <br /> 1. The pump must be tum on with a flow rate setting close to the same as BUBBLER. The default flow rate at 2000ce/min.or previously selected <br /> when sampling at 2.0 LPM with a 37 mm 0.8u cassette. flow may be too fast and draw bubbler solution into the pump. <br /> 2. Using the mini-BUCK Calibrator Ml (0.1 to 300 cc/min.) or M5 Generally,1,000 cc/min.is the flow of choice. <br /> (1 to 6000 cc/min.),measure the flow through the adsorbent tube as 1. Connect a standard 37mm three piece filter cassette (with a <br /> shown above. 0.8 micron filter in place)close to the inlet of the pump.This serves <br /> 3. Use a screw driver to adjust the flow to the desired rate. If the desired as a protective trap to prevent any fluids from being drawn into the <br /> flow cannot be obtained by adjusting the needle valve in the low pump. <br /> flow holder, on the pump use the "SET' button and the arrows to 2. Attach a bubbler using desired length of hose to the input of the <br /> increase the flow through the tube. Lower pump flows give longer cassette,so the order of the sampling train from right to left(traveling <br /> sample run times. Some new higher flow thermal desorption,higher upstream of the flow)is pump,cassette and then bubbler as shown in <br /> backpressure tubes may be used with the non-adjustable tube holder drawing. Set flow at 1,000 cc/min. <br /> (P.N.APB-109032)for flow above 800 cc/min. I m um 3. Tuoff, and next add solution to bubbler and reinstall flow <br /> 4. Once the sample flow rate has been set:an accuracy of flow of t 5% pump <br /> tube to holder. <br /> can be maintained throughout the sampling day. <br /> 4. Press ON begin sampling. Even though different brands of bubblers/ <br /> impingers have varying amounts of flow resistance,the BUCK-Libra <br /> Series Pumps will operate at the pre-selected flow. <br /> 10 11 <br />