8
c. After 5 minutes, repeat the air blank making sure that the flashlight is on. If none
of the bar-graph indicator lights come on (after observing for 15-20 seconds), the
air blank check is OK.
d. If however, one or more of the indicator lights come on again, this clearance
process should be repeated. If after two attempts to clear the unit, the indicator
lights are still coming on when the air blank is performed, there are two
possibilities:
i. The unit requires an internal zero adjustment. To have this
adjustment made, the unit has to be returned to the manufacturer.
ii. The air in the test room contains a significant amount of alcohol. To
determine if this is the case, air blanks should be made away from
the test room to see whether the unit gives a zero reading when
removed from the test area.
5. Once the air blank has been performed with a satisfactory result, the PASV unit
is ready for sensitivity testing.
PAS V Sensitivity Checking
NOTE
:
If the low battery lamp starts flashing at any point in the procedure,
recharge the battery before proceeding.
1. Turn on the flashlight to activate the fuel cell heater. Leave it on for 5 minutes so
that the fuel cell comes up to design temperature before starting the test.
2. Check that the inlet and outlet ports of the PAS V are free of obstruction.
3.
Attach the Calibration Connector Tube to the outlet on the dry gas regulator.
NOTE: Throughout the procedure, the test conductor should check for a flashing
battery light to ensure that the battery is not running down during the testing
procedure.
