Operation
Calibration Menu
3-24 Model 42i Low Source Instruction Manual Thermo Electron Corporation
Calibrate NO and NO
x
Background
The Calibrate NO and NO
x
Background screens are used to adjust the
background, or perform a “zero calibration”. Be sure the analyzer samples
zero air until the readings stabilize. The display shows the current NO or
NO
x
reading.
It is important to note the averaging time when calibrating. The longer the
averaging time, the more precise the calibration will be. For the most precise
calibration, use the 300-second averaging time. For more information about
calibration, see Chapter 4, “Calibration”.
• In the Main Menu, choose Calibration > Calibrate NO or NO
x
Background.
•Press to set the new reading to zero.
CALIBRATION: CALIBRATION:
>CAL NO BACKGROUND >CAL NO BACKGROUND
CAL NOx BACKGROUND CAL NOx BACKGROUND
CAL NO COEFFICIENT CAL HI NO COEFFICIENT
CAL NO2 COEFFICIENT CAL HI NO2 COEFFICIENT
CAL NOx COEFFICIENT CAL HI NOx COEFFICIENT
CALIBRATE PRESSURE CAL LO NO COEFFICIENT
ZERO/SPAN CHECK
CAL LO NO2 COEFFICIENT
ª
RANGE AVG DIAGS ALARM
RANGE AVG DIAGS ALARM
CAL LO NOx COEFFICIENT
CALIBRATE PRESSURE
NO BACKGROUND:
NO: 1.2
CURRENTLY: 0.0 ?
SET NO TO ZERO
RANGE AVG DIAGS ALARM
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