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Appendix C
Land Surveyor Calibration (Auto)
Calibration is as described earlier in this manual, with one exception: the %
GAS [%HI] sensor is calibrated separately from the Catalytic (PPM/%LEL
or PPM/%LO) sensor. Therefore a multi-step calibration process has been
programmed into the Auto Calibration routine. First, the standard sensors are
calibrated using a multi-gas mixture. Then TC sensor is calibrated using a
multi-gas cylinder, containing 50% CH
4
(Methane), CO
2
(Carbon Dioxide),
and N
2
(Nitrogen).
1. A separate air adjust is required for the % LEL and % GAS ranges.
Perform an air adjust in the % LEL and % GAS ranges before
calibration.
2. Begin the calibration process by performing an Auto Calibration. The
TC sensor will be ignored during the multi-gas calibration.
3. When the multi-gas Auto Calibration is complete, a double beep
prompts the user to begin the TC sensor calibration. The default gas
concentration is displayed with the ADJ icon to indicate you may
change the concentration. If the concentration on the gas cylinder
does not match the concentration displayed.
4. Press to begin the calibration.
5. Apply the calibration gas and follow the prompt to complete the
calibration process.
Land Surveyor Calibration (Manual)
Manual calibrations are performed as described in Chapter 5, Calibration.
Once in the manual calibration screen, the location of the sensor(s) are as
illustrated below (CH
4
/O
2
version shown).
1. Press
→
to accept or
↓
to advance to the next gas depending on what
sensor you want to calibrate.
TC
CH4 O2
