Thermo 42i - Calibration Menu

Operation
Calibration Menu
Thermo Electron Corporation Model 42i Low Source Instruction Manual 3-23
Calibration Menu The Calibration menu is used to calibrate the analyzer, including zero
backgrounds, the NO, NO
2
, and NO
x
coefficients, and the calibration
pressure. The screens below show the calibration menu in single mode and
dual/auto range modes.
The calibration procedure is the same in dual, auto, or single range,
however, there are two sets of gas coefficients in dual or auto range (i.e. low
and high coefficients). This enables each range to be calibrated separately.
When calibrating the instrument in dual or auto range, be sure to use a low
span gas to calibrate the low range and a high span gas to calibrate the high
range.
Whether dual or single range, the first step in calibrating the instrument is
to assign the calibration pressure. The calibration pressure is used to
account for slight pressure fluctuation brought on by changing weather. The
calibration pressure is set equal to the reactor pressure at the time of
calibration. For more information about calibration, see Chapter 4,
“Calibration”.
• In the Main Menu, choose Calibration.
RESTORE DEFAULT CAL: RESTORE DEFAULT CAL:
 RESTORE  RESTORE
ARE YOU SURE YOU WANT TO?x
PRESS ¨ TO CONFIRM RESTORE
RANGE AVG DIAGS ALARM
RANGE AVG DIAGS ALARM