RKI Instruments Gas Tracer - Manual (Page 143)

Gas Tracer Operator’s Manual Using Maintenance Mode • 135
Calibrating and Bump Testing the PPM Combustible
Sensor
The PPM sensor in the Gas Tracer needs to be calibrated and bump
tested separately. It cannot be calibrated using the AUTO CAL or
ONE CAL
menu items in the main menu or bump tested using the
BUMP menu item in the main menu. The PPM CAL menu item must
be used. In addition, a 6 inch humidifier tube must be used to connect
the zero air cylinder (if used for a WET fresh air adjustment) and the
ppm calibration cylinder to the instrument.
1. Use the AIR▲ or (SHIFT)▼ buttons to display the PPM CAL Mode
item.
2. Press and release the POWER ENTER button. The display will
indicate that the ppm sensor is warming up.
3. The recommended calibration sequence for a quarterly calibration
is WET fresh air adjustment, WET span adjustment. The
recommended calibration sequence for a biannual calibration
(every 6 months) is DRY fresh air adjustment, WET fresh air
adjustment, WET span adjustment.
Performing a Wet Fresh Air Adjustment
This section describes how to perform a fresh air adjustment on the
PPM combustible gas sensor using the WET setting. Using the WET
setting and fresh air or a zero air cylinder with a 6 inch humidifier
tube is appropriate for a quarterly calibration.
MAINTENANCE
PPM CAL
30
MAINTENANCE
sec
WARM UP