Sample Setup Guide Sampling Train — Multiple Sorbent Tubes Publication 1451 PDF
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Sample Setup Guide Sampling Train — Multiple Sorbent Tubes Multiple-tube sampling provides many benefits when collecting hazardous gases and vapors from air. This method reduces time in the field and uses fewer sample pumps because multiple contaminants requiring different sample tubes can be sampled with one pump. Multiple-tube sampling also allows collection of Time-Weighted Averages (TWAs) and Short-Term Exposure Limits (STELs) and side-by-side simultaneous sampling at different flow rates. This Sample Setup Guide demonstrates how to set up a Sampling Train Using Multiple Sorbent Tubes. Required Equipment 1. An air sampling pump capable of sampling at the recommended flow rate with the sampling medium in line, such as: • SKC Pocket Pump® TOUCH with Constant Pressure Controller Cat. No. 224-26CPC-10 (for use in constant flow mode only) • SKC AirChek® Series with Constant Pressure Controller Cat. No. 224-26-CPC and Adjustable Multiple Tube Holder Cat. No. 224-26 Series 2. An airflow calibrator such as: • SKC chek-mate Calibrator Cat. No. 375-07550N • TSI 4146 Calibrator Cat. No. 740-4146 3. An Adjustable Multiple-tube Low Flow Holder: • Dual (for 2 tubes) Cat. No. 224-26-02 • Tri (for 3 tubes) Cat. No. 224-26-03 • Quad (for 4 tubes) Cat. No. 224-26-04 4. The sorbent sample tubes specified in the method 5. The appropriate size protective covers for the Adjustable Low Flow Holder: • • • • Introduction To determine the correct flow rate for the chemical of interest, refer to the appropriate analytical method. See the operating instructions for the pump to ensure that it can sample at the correct flow rate. 1. Preparing the Sorbent Tubes Using a tube breaker, break off both ends of each sorbent tube to provide an opening of at least one-half the internal diameter. These tubes will be used for calibrating the flow and not for collecting the sample. 2. Setting Up the Calibration Train with Adjustable Multiple-tube Low Flow Holder — Figure 1 If using a Pocket Pump TOUCH in constant flow mode or any of the AirChek Series pumps, use flexible tubing to connect the CPC to the pump inlet. Using flexible tubing, connect the adjustable low flow holder to the CPC (or to the pump inlet if using a Pocket Pump TOUCH in constant pressure mode). Place the sorbent tubes into the black rubber sleeves of the adjustable low flow holder. The printed arrow on the sorbent tube shows the direction of the airflow and should point toward the holder. If there is no arrow printed on the tube, insert the end of the tube with the smallest sorbent section (backup section) into the holder. for 6-mm OD x 70-mm L tubes Cat. No. 224-29A for 8-mm OD x 110-mm L tubes Cat. No. 224-29B for 10-mm OD x 150-mm L tubes Cat. No. 224-29C for 10-mm OD x 220-mm L tubes Cat. No. 224-29D Quad Adjustable Low Flow Holder CPC Tygon Tubing Pump Inlet Optional Equipment 1. SKC Tube Breaker: • Cat. No. 226-03-055 Sample Tubes with Covers Figure 1. Multiple-tube sampling train with AirChek TOUCH Publication 1451 Rev 1707 SKC Inc. 724-941-9701 SKC South 434-352-7149 SKC Gulf Coast 281-859-8050 www.skcinc.com SKC-West 714-992-2780 Sampling Train — Multiple Sorbent Tubes 3. Calibrating the Flow Rate — Figure 2 Allow the pump to equilibrate from one temperature extreme to another and to run for 5 minutes before calibrating. Note the flow rates specified by each sampling method and add them together. Set the pump to a flow rate at greater than or equal to 15% higher than that sum. Calibrate the flow rate through each tube. The flow rate through any one tube cannot exceed 500 ml/min. To calibrate the flow rate, connect the open end of one sorbent tube to an external calibrator. Dual Adjustable Low Flow Holder Sample Tubes Tygon Tubing Tygon Tubing Flow Adjust Screws 5. After Sampling At the end of the sampling period, turn off the pump and note the ending time. Remove the sorbent tubes, seal the ends of each tube with the caps provided, and record pertinent sample information. CPC Pump Inlet chek-mate Sample Pump 4. Sampling — Figure 4 When ready to start sampling, break off both ends of new sorbent tubes in the same manner used for calibrating the flow. Insert the sorbent tubes into the rubber sleeves of the adjustable low flow holder. Ensure unused ports contain unopened tubes to "seal" each port. Place a protective cover over each sorbent tube. Attach the clips to a worker’s collar and the pump to the worker’s belt. The sorbent tubes should be placed in a vertical position during sampling. Turn on the pump and note the start time and any other sampling information. If one tube is removed from a multiple tube holder during sampling, immediately replace it with an unopened tube for the remainder of the sampling period. Figure 2. Multiple-tube calibration train with Pocket Pump TOUCH (constant flow mode) Adjust the flow adjust screw on the corresponding port on the tube holder until the desired flow rate is achieved. Turn the screw clockwise to decrease the flow. For tri and quad models, first rotate each anti-tamper cover to expose the flow adjust screw (Figure 3). Disconnect the tube from the calibrator and calibrate the next tube. Changing the flow on one tube will not affect the flow through tubes already set. When using a multiple tube holder, ensure that all ports contain sorbent tubes. If sampling with fewer tubes than the number of ports, insert unopened sorbent tubes in the empty ports to seal them. Calibrate the flow rate for each tube as specified in the analytical method for the chemical of interest. When the flow rate has been calibrated, remove the calibrator and set aside the sorbent tubes used to calibrate the flow. These tubes will be used after sampling to verify the flow rate. Record the pre-sample flow rate. Using a calibrator, calibrate the flow rate with representative sorbent tubes in line (the sorbent tubes originally used to calibrate the flow) to verify that the flow has not changed by more than 5%. Submit field blanks from the same lot number as the sample tubes. Field blanks should be subjected to exactly the same handling as the samples (open, seal, and transport) except that no air is drawn through them. Pack the sample sorbent tubes, field blanks, and all pertinent information securely for shipment to a laboratory for analysis. Protective Covers with Clips Dual Adjustable Low Flow Tube Holder Tygon Tubing CPC Inlet Flow Adjust Screws Sample Pump Figure 4. Dual-tube sampling train on worker Anti-tamper Cover Copyright 1998 - 2017 Figure 3. Top view of a quad adjustable low flow holder Notice: This publication is intended for general information only and should not be used as a substitute for reviewing applicable government regulations, equipment operating instructions, or legal standards. The information contained in this document should not be construed as legal advice or opinion nor as a final authority on legal or regulatory procedures. Publication 1451 Rev 1707 SKC Inc. 724-941-9701 SKC South 434-352-7149 SKC Gulf Coast 281-859-8050 www.skcinc.com SKC-West 714-992-2780
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