Form 37182 Rev 201019
Page 5 of 12
Low Flow Applications (5 to 500 ml/min)
• Single-tube sampling requires the All-in-One Adjustable Tube Holder; see the operating instructions for the All-in-One for details on its operation.
• Multiple-tube sampling requires a Constant Pressure Controller (CPC) and a Dual, Tri, or Quad Adjustable Low Flow Tube Holder accessory;
see the operating instructions for the CPC and Adjustable Low Flow Tube Holder for details on their operation.
Using the All-in-One Adjustable Tube Holder
Set/Calibrate Flow Rate for Single Tube
Do not operate AirLite with Timer in hazardous or explosive locations. Pump is designed for applications that do not require intrinsic
safety.
• Allow pump to equilibrate after moving it from one temperature extreme to another.
• Calibrate/verify pump flow rate before and after each sampling operation using the tube holder and pump to be used for sampling.
• Set the flow rate through the pump first and then calibrate the flow rate through the representative sorbent tube.
• Two small inlet holes on the bottom of the built-in CPC of the All-in-One can become blocked. Periodically inspect and, if needed, clean with a
small pick and blow particles away with a puff of air.
Pump Flow Rate
1. Turn on the pump using the on/off button
(Figure 1)
and run for 5 minutes
before calibrating. Leave the pump running.
2. Prepare the calibrator
(see calibrator instructions)
. Using flexible tubing,
connect the calibrator outlet (suction port) to the pump inlet.
3. Set the pump flow rate to 1.5 L/min. Using a small screwdriver, turn the
flow adjustment screw on top of the pump
(Figure 1)
,
clockwise
to increase
flow or
counterclockwise
to decrease flow, until the calibrator indicates
1.5 L/min.
4. Remove tubing from the pump inlet.
Flow Rate Through Sorbent Tube
1. Attach the Tygon tubing of the All-in-One to the pump inlet.
See calibration
train at right.
Note:
If the pump flow faults shortly after the holder is attached,
check that the needle valve is open by using a small flat-head screwdriver to
turn the flow adjust screw on the holder
slightly
counterclockwise. If flow fault
continues, check that the two small holes on the bottom of the built-in CPC are
not blocked. If needed, clean holes with a small pick and blow any particles away with a puff of air.
2. Break tips off the representative sorbent tube and insert it into the rubber sleeve on the All-in-One
(arrow on the tube points toward
the holder).
Ensure that the sorbent tube fits snugly in the rubber sleeve prior to sampling to avoid air leakage. Two sleeves, each a
different inner diameter, are supplied with the All-in-One.
3. Using flexible tubing, connect the calibrator outlet to the inlet of the representative sorbent tube in the holder.
In the next step, do not shut off flow completely with flow adjust screw or use an oversize screwdriver to adjust
flow — valve or thread seat damage may result.
4.
Do not adjust the flow on the pump.
Adjust the flow rate through the representative sorbent tube using a
small flat-head screwdriver to turn the flow adjust screw on the All-in-One
(counterclockwise to increase,
clockwise to decrease)
until the calibrator displays the method-specified flow rate. Take a minimum of three
readings and record the average flow rate, as per OSHA/NIOSH instructions.
5. When calibration is complete, turn off the pump by pressing the on/off button. Disconnect the calibrator and tubing from the representative
sorbent tube inlet.
Flow adjust screw
(needle valve)
All-in-One
adjustable
tube holder
Tygon tubing
Pump
inlet
Turn screw on holder
to adjust flow.
Flow
adjust
screw
Calibration train with All-in-One
connected to pump
Suction
port
