Operating Instructions - Snap-on Equipment

Pocket PC MaintenanceLow Out FlowThis message displays when the bench/gas analyzer exhaust out hose isplugged or disconnected and the pump turns off. Correct the problem andturn on the pump.Low In FlowThe gas analyzer senses when the inlet sample hose is plugged. If thescreen indicates low flow, you must clear the hose to enable furthertesting. If low flow persists and the source of the low flow cannot be found,locate the quick disconnect on the hose leaving the water filter bowl (thisfitting has a red ring above the hose) and remove the connection. Pushupward on the red ring and pull the hose out. Wait ten seconds andreconnect.If excessive water accumulates in the bowl the analyzer indicates LOW INFLOW. The filter bowl has a float located inside to protect the analyzerbench. Empty the water from the filter bowl and change the filter. SeeWater Trap / Filter Maintenance Warnings, page 2G-26. Then, locate thequick disconnect on the hose leaving the water filter bowl (this fitting has ared ring above the hose) and remove the connection. Push upward on thered ring and pull the hose out. Wait ten seconds and reconnect.Low flow may occur when operating the analyzer upside down or when theanalyzer is sitting on a severe incline.NO x Cell Low VoltageThis message could appear at the end of a gas calibration and indicatesthe NO x cell may need to be replaced.✓ If this message appears, perform gas calibration again using theNew NO x Cell Calibrated procedure in place of the standard gascalibration. (Maintenance > Setup > New NO x )Pump OffThe FGA software provides the ability to toggle the gas bench pump Onand Off. From the Main menu select Meters / Graph and then Pump to turnthe pump on or off. Normally, the pump turns on automatically any timeyou enter TSI, Idle, Meters, Strip Chart or Bar Graph. If you see the PumpOff message, it means an error has caused the pump to turn off. Exit thescreen you are on and re-enter to turn the pump back on.Excess DilutionAn Excessive Dilution Error is caused when the software does not senseenough emissions from the analyzer bench. Normally this means theprobe is not in the vehicle’s exhaust pipe or there is a hole in the exhaustpipe.The level of dilution checked for by the software can be altered in theMinimum Dilution field of General Setup (Main menu > Maintenance >Setup > General Setup). Dilution value is measured by calculating CO +CO 2 . If CO + CO 2 is less than the setting in the Minimum Dilution field, thenFGA signals the error.2G-29