SKC Limited Universal Pump Step By Step Guide - Manual (Page 12)

Page 10 224-G3 Issue C www.skcltd.com
Gas & Vapour Sampling using Sorbent Tubes
You will need :-
• Universal sample pump (fully charged)
• Low flow adaptor (tube holder)
• Tube cover of appropriate size for the sorbent tube
being used
• A length of flexible tubing
• Tube adaptor for small diameter sorbent tubes (SKC
part no. 717-511)
• Two sorbent tubes from the same box or batch
• Flow calibration device capable of measuring the
intended flow rate, typically between 5 and 500 ml/
min, such as the Defender primary calibrator
• Toolkit to adjust the flow rate
1. Connect the flow calibrator directly to the sample
pump inlet hosetail using the length of tubing. Turn on
the pump and adjust the flow rate to 1.5 litre/minute.
Note: The sample pump must be in the high flow
mode during this process. This is the required flow
rate for correct operation of the pump's built-in low
flow regulator. Switch off the pump and disconnect
the flow calibrator.
No further adjustment of the
pump flow rate should be made.
2. Unscrew the low flow mode screw cover from
the top of the pump as shown, to reveal the
low flow mode screw. Using the large bladed
screwdriver attachment of the toolkit, turn the
low flow mode screw three turns anti-clockwise
to put the pump into the low flow mode.
The combined low flow adaptor and tube holder is
now connected to the pump inlet hosetail using the
length of tubing.
3. Take one of the sorbent tubes and break off both
ends, ideally using a purpose designed tube tip