7
Low Flow Applications (5 to 500 ml/min)
Using Multiple-tube Adjustable Low Flow Holder
When performing multiple-tube sampling using an adjustable low
fl
ow holder (dual,
tri, or quad), ensure the regulator has been activated and the pump
fl
ow rate is set
at 1.5 L/min. The maximum
fl
ow rate through any one tube is 500 ml/min
*
. Calculate
the sum of all tube
fl
ow rates. If the sum is
≤
1000 ml/min, proceed with calibration
and sampling without any further adjustment to pump
fl
ow rate. If the sum is > 1000
ml/min, set the pump
fl
ow rate 15% higher than the sum of tube
fl
ow rates.
* Back pressure across some sample tubes can be higher than average. In these instances, the maximum
fl
ow rate of
500 ml/min per tube may not be achieved.
Setup
Low
fl
ow applications require an adjustable low
fl
ow holder (Figure 2). Ensure pump
is
not
running. Fully charge the battery by connecting the charger plug to the sampler
charging jack (Figure 1, #18). Use only an SKC charger designated for this model.
CAUTION: DO NOT CHARGE OR OPERATE THE PUMP FROM CHARGER
IN HAZARDOUS LOCATIONS. Charge in fresh air only.
Ensure battery is fully
charged before calibrating and sampling.
After charging the battery pack, it is good practice to run the pump for approxi-
mately 5 minutes before calibrating. This ensures the battery is in more steady-state
conditions and improves the agreement in pre and post-sampling calibrations.
Use only an SKC-approved charger designated for this model to ensure reliable
performance. Failure to do so voids any warranty.
Ensure proper orientation of charging cable before plugging it into the
charging jack. Improper orientation/contact will short-circuit the battery and
voids any warranty.
Short-circuiting the battery pack will render it immediately inoperative.
Failure to follow warnings and cautions voids any warranty.
Remove tamper-resistant cover. Adjust the
fl
ow to 1.5 L/min using the FLOW ADJUST-
MENT SCREW (Figure 1, #4).
Remove the cap screw (Figure 1, #11) covering the regulator isolation valve. Turn the
exposed screw 4 to 5 turns counterclockwise. Replace the cap screw. The pump is now
set for low
fl
ow.
Setting the Flow Rate
Before use, allow pump to equilibrate after moving it from one
temperature extreme to another.
Ensure pump has run for 5 minutes before proceeding with calibration. Connect a
multiple-tube adjustable low
fl
ow holder (Figure 2) to the pump intake (Figure 1, #6) us-
ing 1/4-inch Tygon tubing.
