SKC 110-100 AirLite - Manual (Page 10)

8
Setting or Verifying the Flow Rate
For Low Flow Sampling (5 to 500 ml/min)
(Requires optional Constant Pressure Controller (CPC) and Adjustable Low Flow
Tube Holders - see Low Flow Adapter Kit in Optional Accessories.) See Figure 2.
Ensure pump has run for 5 minutes before calibrating.
The Constant Pressure Controller (CPC) accessory, Cat. No. 224-
26CPC-10, is used as a pressure regulator to maintain a constant
10 inches water back pressure for low fl ow sampling. The CPC is
used in conjunction with an Adjustable Low Flow Tube Holder
(Cat. Nos. 224-26-01, -02, -03, or -04) for single or multiple-tube
sampling.
Set the fl ow rate at ap-
proximately 1.5 L/min.
(See Sett ing Flow Rate
for High Flow Sampling,
page 7.) For multiple-
tube sampling, the
fl ow rate must be
greater than the sum
of the required fl ow
rates through all the
tubes.
With a short length
of Tygon
® tubing,
connect the pump
inlet to the CPC outlet
(the side of the CPC
without a label),
(Figure 2). Connect the
inlet side of the CPC
(marked “to sample”)
to the Adjustable Low
Flow Tube Holder
(Figure 2).
Label all tubes and ports. Insert opened representative tubes into
the rubber sleeves of each port on the Adjustable Low Flow Tube
Holder. If any port remains unused, place an unopened tube in it; it
is important to “seal” unused ports.
Use tubing to connect the exposed end of one tube to a primary
standard fl owmeter. Loosen the screw on the low fl ow holder port.
Turn on the pump using the On/Off butt on (Figure 1, #8), and calibrate
fl ow. Turn the brass screw (needle valve) on the Adjustable Low Flow
Tube Holder (Figure 2) until the fl owmeter matches the desired fl ow
rate. For multiple-tube sampling, repeat this procedure for each port
to calibrate the fl ow rate for each tube. Seal unused ports.
Do not adjust the fl ow on the pump. Adjust fl ow by using the brass
screw on the Adjustable Low Flow Tube Holder.
2
cont’d
continued on page 9
Collar Clip
Protective
Cover for
Sample Tube
Flow Adjustment
Screw (needle valve)
Adjustable Low
Flow Tube Holder
Tygon Tubing
Figure 2
Confi guration for Low Flow Sampling
Constant
Pressure
Controller
(CPC)