SKC 210-5000 AirChek XR5000 - Manual (Page 16)

13
Calibration
Calibration (Low Flow: 5 to 500 ml/min)
Requires Constant Pressure Controller (CPC) and Adjustable Low Flow Tube Holder -
see Accessories, Low Flow Adapter Kit on page 18. The low fl ow tube holder (low fl ow adapter
kit, Cat. No. 210-500) used with CPC allows up to four tube samples to be taken simultaneously,
each at different fl ow rates if desired.
Before use, allow pump to equilibrate after moving it from one
temperature extreme to another.
Charge pump battery completely before calibration and sampling.
1. Run pump for 5 minutes before performing calibration.
2. a. For single-tube applications, set the fl ow rate to 1500
ml/min (see Setting Flow Rate).
b. For
multiple-tube applications, the pump fl ow rate
must be set at ≥ 15% higher than the sum of the fl ow
rates through all tubes.
Do not exceed 500 ml/min fl ow rate
per tube for multiple-tube sampling.
3. Use tubing on the CPC to connect the pump
inlet to the CPC outlet (the side of the CPC
without a label). Connect the inlet side of the
CPC (marked “to sample”) to the Adjustable
Low Flow Tube Holder.
4. Label all tubes and ports if performing
multiple-tube sampling.
5. Insert opened representative tubes into the
rubber sleeve(s) of each port on the Adjustable
Low Flow Tube Holder. If any ports remain unused, place unopened tubes in
them; it is important to “seal” unused ports.
6. Loosen the brass fl ow adjust screw on the low fl ow holder. Use tubing to connect the
exposed end of one tube to a primary standard calibrator.
7. Turn on pump. Turn the fl ow adjust screw (needle valve) on the tube holder until the
calibrator indicates the desired fl ow rate (do not adjust the fl ow rate of the pump).
For multiple-tube sampling, repeat this procedure for each port to calibrate the fl ow
rate for each tube. Seal unused ports during calibration with unopened tubes.
8. Disconnect the calibrator and tubing. Replace representative tubes with new
unexposed tubes for sampling.
The CPC has two small inlet ports on the bottom of the unit. These ports should
be inspected periodically for blockage, which can occur when sampling in dusty
environments. Blocked ports will cause back pressure to increase. Clean ports
with a small pick and use air to blow away particles.
Adjust fl ow with fl ow adjust
screw on tube holder.
Note