Form 37711 Rev 1809
Page 9 of 14
Low Flow Applications, Multiple Tubes (Cont)
6. Prepare the calibrator.
See calibrator instructions
.
7. Using flexible tubing, connect the exposed end of the first sorbent tube to the calibrator outlet (suction port). Loosen and turn the brass
flow adjust screw
(Figure 4)
on the port of the appropriate tube holder (
counterclockwise to increase, clockwise to decrease
) until
the desired flow rate is achieved.
Note:
For tri and quad models, first rotate each anti-tamper cover (Figures 4 and 5) to expose the flow adjust
screws, then adjust the appropriate one until the calibrator indicates the desired flow.
Do not adjust the flow on the pump. Adjust the flow only by using the flow adjust screw on the
tube holder.
Do not exceed 500 ml/min flow rate per tube.
8. Disconnect the calibrator from the tube and connect it to the next sorbent tube. Repeat the flow adjustment
process until all tubes are flow-calibrated. Changing the flow on one tube will not affect the flow rate
through the remaining tubes.
9. When the flow rate is set for each tube, turn off the pump and disconnect the calibrator.
Set Up/Sample
• Allow pump to equilibrate after moving it from one temperature extreme to another.
• Protect sample pump from weather when in use outdoors.
• Powering the pump with any device other than the approved battery pack voids the UL Listing for intrinsic safety.
• Do not use the pump with the Battery Eliminator in hazardous locations. UL Listing for intrinsic safety is not in effect
during pump operation with Battery Eliminator.
• Use of any device other than the approved battery pack or Battery Eliminator to power the pump voids any warranty.
• Charge pump battery completely before calibration and sampling.
• Calibrate/verify pump flow rate before and after each sampling operation using the tube holder and pump to be used
for sampling.
1. Replace the sampling media used for calibration with unexposed media for sample collection. Use protective
tube covers to prevent tube breakage.
2. Place the sampling medium where appropriate for sampling. For personal sampling, clip the tube holder to the worker in the breathing
zone.
3. Start the sampling by turning on the pump using the on/off switch
(Figure 1)
. Record the start time.
4. At the end of the sampling period, turn off the pump and record the stop time.
5. Seal the sample(s) and send with blanks and pertinent sampling information to a laboratory for analysis.
6. Verify the flow.
a. Turn on the pump and reinstate the calibration train and sampling media.
b. Take three readings and record the average value as the post-sample flow rate.
Do not adjust the pump flow rate during this step.
c. Compare the pre and post-sample flow rates. Note in sampling documentation if the values differ by more than ± 5%.
7. To return to high flow, remove the tube holder and deactivate the regulator.
See Deactivate the Regulator for High Flow.
Clip holder to worker
and pump to belt.
Screw
Screw
Figure 5
Cut-away of Tri/Quad
Adjustable Tube Holder
