RKI Instruments Gas Tracer - Manual (Page 224)

216 • Calibrating and Bump Testing the PPM Combustible Sensor Gas Tracer Op-
6. Hold down the AIR▲ button. The unit will prompt you to continue
holding the AIR▲ button.
7. When the unit prompts you to release the AIR▲ button, release it.
The instrument will perform a fresh air adjustment on the ppm
sensor and return you to the AIR CAL menu item.
8. Disconnect the tubing from the probe.
Performing an Auto Calibration
This section describes how to calibrate the PPM combustible gas
sensor using auto calibration.
1. To calibrate the ppm sensor using auto calibration, use the AIR▲
button to scroll to AUTO CAL and press and release the POWER
ENTER button.
2. Fill the gas bag with ppm calibration gas as described in “Filling
the Gas Bag” on page 195.
3. You will be prompted to choose between WET and DRY. Use the
WET setting.
NOTE: The DRY setting in AUTO CAL is for factory use only. Do not
perform a calibration in AUTO CAL using the DRY setting.
4. Use the AIR▲ or (SHIFT)▼ buttons to display the WET setting and
press and release the POWER ENTER button. The calibration
value screen will be displayed.
5. The gas concentration displayed in the calibration value screen
must match the gas concentration listed on the calibration cylinder.
AIr
CAL
MAINTENANCE
HOLD AIR
1000
ppm
MAINTENANCE
CH
4
AUTO CAL