PAS Systems International PAS V Calibration Manual
Also see for PAS V: Instruction manual
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4Readying the PAS V1. Be sure the battery is installed and fully charged, with the flashlight ON. Thereshould be no blinking red battery light.2. Inspect the inlet/outlet ports of the PAS V to make sure that they are not clogged.3. Conduct an air blank:a. Turn on the flashlight and take an air sample by pressing the Sensor ControlButton; the green indicator light comes onb. Observe the light bar for 15-20 seconds. If only the small green samplingindicator light comes on, the air blank check is OK.4. Clear a fuel cell overload (if one or more of the bar-graph indicatorlights comes on during air blank):a. Turn the flashlight on to activate fuel cell heater (check that the HTR light is on).This speeds the cell’s response, clearance and recovery time.b. Turn off the PAS V. This also speeds the recovery of the fuel cell.c. After 5 minutes, repeat the air blank making sure that the flashlight is on. If noneof the bar-graph indicator lights come on (after observing for 15-20 seconds), theair blank check is OK.d. If however, one or more of the indicator lights come on again, this clearanceprocess should be repeated. If after two attempts to clear the unit, the indicatorlights are still coming on when the air blank is performed, there are twopossibilities:1. The unit requires an internal zero adjustment. To have this adjustmentmade, the unit has to be returned to the manufacturer.2. The air in the test room contains a significant amount of alcohol. Todetermine if this is the case, air blanks should be made away from the testroom to see whether the unit gives a zero reading when removed from thetest area.5. Once the air blank has been performed with a satisfactory result, the PASV unitis ready for sensitivity testing.NOTE: Be sure the room air is free from alcohol and that the ambient temperatureis above 50°F. Do not have jars of stock solution or other alcohol open in the roomduring testing.NOTE: Throughout the procedure, the test conductor should check for a flashingbattery light to ensure that the battery is not running down during the testingprocedure. |
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