Form 37182 Rev 201019
Page 8 of 12
5. Using a small screwdriver, loosen and turn the brass flow adjust screw (
see above right
) directly
beneath the port holding the first active representative tube to be calibrated (
clockwise
to increase,
counterclockwise
to decrease) until the calibrator indicates the method-specified flow rate.
Do
not adjust the flow rate on the pump.
Note:
For tri and quad models, first rotate each anti-tamper
cover to expose the flow adjust screws, then adjust the appropriate one until the calibrator indicates the
desired flow (Figures 3 and 5).
6. Repeat Steps 4 and 5 for each active representative tube.
Note:
Changing the flow on one tube will
not
affect the flow rate through the remaining tubes.
7. Once flow is calibrated for each active representative tube, it is recommended practice to re-check
the flow rate through all representative tubes before removing them. Any adjustment should be
minimal.
Set Up/Sample with Multiple Tubes
Do not operate AirLite with Timer in hazardous or explosive locations. Pump is designed for applications that do not require intrinsic safety.
• Requires Constant Pressure Controller (CPC) and Adjustable Low Flow Tube Holder (see Accessories). The low flow tube holder used with CPC
allows up to four tube samples to be taken simultaneously, each at different flow rates if desired.
• Allow pump to equilibrate after moving it from one temperature extreme to another.
• Protect sample pump from weather when sampling outdoors.
•
For maximum run time,
insert new batteries before each sampling period. If using rechargeable AA 1.2-volt
batteries, expect approximately half the run time stated for disposable batteries.
• The two small inlet ports on the bottom of the CPC can become blocked. Inspect these ports periodically for
blockage that can occur when sampling in dusty environments. Such blockage may cause back pressure to
increase. Clean ports with a small pick and blow away any particles with a puff of air.
1. Replace the representative sorbent tubes used for calibration with new unexposed sorbent tubes for
sample collection.
2. Place a protective tube cover over each tube and thread into place on holder until secure.
3. Place the adjustable holder with tubes where appropriate for sampling.
For personal sampling,
clip the
low flow tube holder to the worker in the breathing zone and the pump to the worker’s belt.
See right.
4. Press the on/off button to turn on the pump and start sampling. Record the start time and other pertinent
information.
Possible Displays During Sampling
Flow or Battery Fault Shutdown -
If the pump is unable to compensate due to excessive back pressure or a low battery
condition exists, it will shut down and timing functions will pause. The LCD will display either a battery-shaped icon
or a flow fault icon (
) depending on the cause of the shutdown. Upon flow fault, the pump will attempt to restart up
to five times. To restart from flow fault, correct the blockage and press the on/off button twice.
The elapsed run time
display will reset to 0 when the pump is restarted.
If the battery icon is displayed, recharge the battery before sampling.
Displayed Elapsed Run Time -
Elapsed run time is displayed continuously on the LCD. For elapsed times after 999
minutes, the display will show the count start from 0 to 999 again.
Connect
CPC to
pump inlet,
tube holder
to CPC, and
tube inlet to
calibrator.
Figure 4.
Calibration Train with Quad Adjustable
Low Flow Tube Holder
Suction port
chek-mate Calibrator
Quad tube holder
Tube holder outlet
Pump
inlet
CPC inlet (marked
“To Sample”)
Screw
Screw
Figure 5.
Cut-away of Tri/
Quad Adjustable Low Flow
Tube Holder
Turn screw on tube holder to
adjust flow.
Flow adjust screws
Clip tube holder to
worker and pump
to belt.
