Operating Instructions - Snap-on Equipment

Pocket PC MaintenanceIf the gas calibration fails, the Gas Calibration Failed screen displays.Figure 2G-9: Gas Calibration Failed Screen1. Verify that the gas bottle was open.2. Make sure pressure is present at the calibration gas hose outlet. (Gasmust be coming out the end of the hose.)3. Verify that the gas bottle was properly plugged into the gas bench.4. Verify that the gauge on the calibration gas regulator read at least 30 psi.5. Verify the proper calibration gas bottle values.6. Rerun the calibration.Resetting NO x Cell Output Voltage: From time to time during normal use andcalibration, the NO x cell output voltage, used to determine NO x values, must bereset. If after a gas calibration the NO x Warning screen shown in Figure 2G-10appears, perform the gas calibration again. However, DO NOT use the Calibrationfunction. Instead select and perform the New NO x Sensor sequence (Maintenance> Setup > New NO x ); this procedure resets the NO x cell output voltage. (See NewNOx Sensor, page 2G-18.)Figure 2G-10: NO x Warning Screen2G-6