5
Low Flow Applications (5 to 500 ml/min)
Using Single Adjustable Low Flow Holder
Setup
Low flow applications require an adjustable low flow holder (Figure 2). Ensure pump is not
running. Fully charge the battery by connecting the charger plug to the sampler charging
jack (Figure 1, #15). Use only an SKC charger designated for this model. CAUTION:
DO NOT CHARGE OR OPERATE 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.
Start the pump using the ON/OFF switch (Figure 1, #1) and adjust the flow rate to
approximately 1.5 L/min (Figure 1, #4).
Remove the cap screw covering the regulator isolation valve (Figure 1, #11). Turn the
exposed screw 4 to 5 turns counterclockwise. Replace the cap screw. The pump is now set
for low flow.
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 single
adjustable low flow holder (Figure 2) to the pump intake (Figure 1, #6) using flexible tubing.
Insert an opened sorbent tube into the rubber sleeve of the low flow holder so the arrow on
the tube points toward the holder.
Connect a calibrator to the exposed end of the sorbent tube. Loosen the brass flow adjust
screw on the low flow holder. Using the ON/OFF switch, turn on the pump. Adjust the flow
rate by turning the flow adjust screw on the adjustable low flow holder 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 (Figure 2, #2) on the low flow holder.
When the flow rate is set, turn off the pump. Disconnect the calibrator. Replace the sorbent tube
used for setting the flow with a new sorbent tube for sample collection. Place the appropriate
size tube cover (Figure 2, #5) over the tube, and screw it in place on the low flow holder.
