SKC 224-PCXR4, Operating Instructions Manual

Page: 8 / 14

Form 37712 Rev 1702
Page 8 of 14
www.skcinc.com
Figure 4. Quad Adjustable Tube Holder
Rubber sleeve
Top view of fl ow
adjust screws
Connect tube holder to pump inlet
and tube inlet to calibrator outlet.
Low Flow Applications (5 to 500 ml/min)
Using Multiple-tube Adjustable Low Flow Tube Holder (Figure 4)
Activate the Regulator for Low Flow
1. Start the pump using the on/o ff switch (Figure 1) . Press Start/Hold and then press Flow and Ba tt ery Check. Adjust
the fl ow rate by turning the fl ow adjustment screw (Figure 1) until the built-in rotameter reads approximately
1.5 L/min. The LCD should show BATT OK in the upper left corner. If it does not, charge the ba tt ery. Press Flow
and Ba tt ery Check to place the pump in Hold.
2. Remove the cap screw covering the regulator valve (Figure 1) and turn the exposed screw four to fi ve turns
counterclockwise. See right.
3. Replace the cap screw. The pump is now set for low fl ow.
Set/Calibrate Flow Rate for Multiple Tubes
• Allow pump to equilibrate after moving it from one temperature extreme to another.
• Charge pump battery completely before calibration and sampling.
• Calibrate/verify pump fl ow rate before and after each sampling operation using the tube holder and pump to be used for sampling.
Follow these important steps before proceeding:
1. Ensure that the ba tt ery is fully charged and that the pump has run for fi ve minutes before calibrating. Leave pump running.
2. Ensure that the regulator has been activated for low fl ow and the pump fl ow rate is set at 1.5 L/min.
3. Calculate the sum of all tube fl ow rates. The maximum fl ow rate through any one tube is 500 ml/min.*
a. If the sum is ≤ 1000 ml/min, set the pump fl ow rate to 1.5 L/min.
b. If the sum is > 1000 ml/min, multiply that number by 0.15 and total the two numbers. Set the pump fl ow rate for the resulting
new sum. ( Example: Sampling with three sorbent tubes, each with a fl ow rate of 500 ml/min.* The sum of the tube fl ow rates is
calculated as 3 x 500 = 1500. Determining a 15% higher fl ow rate is calculated as 1500 x 0.15 = 225. Calculating the fi nal pump
fl ow se tt ing would be 1500 + 225 = 1725 ml/min.)
* Back pressure across some sample tubes can be higher than average. In these instances, the maximum fl ow rate of 500 ml/min may not be achieved.
4. Connect the tube holder (Figure 4) to the pump inlet (Figure 1) using the a tt ached 1/4-inch
Tygon tubing. See right .
5. Insert an opened sorbent tube into each rubber sleeve of the tube holder (Figure 4) . Ensure
that the arrow on each tube points toward the tube holder.
If sampling with fewer tubes than number of ports, insert unopened sorbent tubes in the
empty ports to seal them.
For low fl ow, turn regulator
valve screw counterclockwise.
Flow adjust screws
Protective cover
Anti-tamper cover
Sorbent sample tube
Tube holder outlet