Form 40017 Rev 1906
Page 15 of 26
a.
Touch Run bu
tt
on. It is good practice to run the pump for 5 minutes before calibrating the
fl
ow
rate.
b. Use a small
fl
at-head screwdriver to turn the brass
fl
ow adjust screw beneath the port of the
tube to be calibrated
counterclockwise to increase
fl
ow or clockwise to decrease
fl
ow
until
the calibrator consistently displays the required
fl
ow rate for the
fi
rst port sorbent tube.
Note:
The
fl
ow rate displayed on the calibrator will change as a result of adjusting the brass
fl
ow adjust screw on the holder; this is the
fl
ow
rate through the sorbent tube. The
fl
ow rate displayed on the pump will
not
change.
c.
Touch the Stop bu
tt
on
to stop the pump. Touch the Back bu
tt
on
to return
to the Flow Menu.
9.
Repeat Steps 6 through 8 for each active sorbent tube in the holder.
10. Disconnect representative sorbent tube from the calibrator. Replace representative sorbent tubes with newly opened unexposed method-
speci
fi
ed sorbent tubes to complete the sampling train.
Important!
Ensure all unused ports remain plugged with unopened sorbent tubes
to keep ports clean during sampling.
See To sample on page 18.
To set up a multiple sorbent tube train and calibrate – Constant Pressure Mode
(For Advanced Users Only)
* Charge pump battery completely before calibration and sampling.
* Requires Multiple-tube Low Flow Holder accessory
* See Adjustable Low Flow Holder Operating Instructions for details on holder operation.
* It is good practice to run the pump for 5 minutes before calibrating the
fl
ow rate.
* Calibrate/verify pump
fl
ow rate before and after each sampling operation using the tube holder and pump to be used for sampling.
1. Determine back pressure to be set in Constant Pressure Mode:
a. Connect tubing from holder outlet to pump inlet.
(Figure 5)
.
b. Break tips o
ff
a representative sorbent tube and insert (arrow printed on
tube pointing toward the pump) into the rubber sleeve of a 224 Series
Multiple-tube Low Flow Holder.
c. Use a small
fl
at-head screwdriver to turn counterclockwise (open) the
brass
fl
ow adjust screw on the Multiple-tube holder port containing
the tube.
d. Label sorbent tube and port.
Plug all unused ports with unopened
tubes to keep ports clean during sampling.
e. Set method-speci
fi
ed
fl
ow rate for the tube on the pump
(see To set
pump
fl
ow rate on page 13).
Important! Ensure all unused ports remain
plugged with unopened sorbent tubes.
i. Touch the Run bu
tt
on
to start the pump.
ii. Read and record back pressure shown on pump display (inH
2
O part
of scrolling display when pump is running – use up/down arrow
bu
tt
ons to speed scrolling display).
f. Repeat Steps 1.b through 1.e for remaining representative sorbent tubes.
Note:
The combined
fl
ow rate through all tubes cannot exceed 500 ml/
min. Touch the Stop bu
tt
on
to stop the pump. Touch the Back
bu
tt
on
to return to the Flow Menu.
g. Review the recorded back pressures and determine the highest back
pressure. Add 2 or 3 inches to this value, round up to the integral
(whole) number, and add 1.
This will be the back pressure se
tt
ing for
Constant Pressure Mode in Step 2.
