2.4 Align the red dots on the stopper and shaft and pull the pump handle to the 50 cc or 100 cc mark.
2.5 Keep the end of the tube in the sample gas source while the gas is being drawn through the tube
for the allotted sampling time (approximately 1- 3 minutes) as indicated on the tube sheet. The
sampling is considered to be completed when the white disc in
‘Vac. Test’ indicator returns to its original position.(see Fig.3)
