Thermo Electron 48C, Instruction Manual

Page: 44 / 204

Chapter 3 Operation
3-20
CO Span Coefficient
The CO span coefficient is calculated during calibration. The span coefficient is used to
correct the CO readings and normally has a value near 1.000.
The CO Span Coefficient screen enables the CO span coefficient to be manually changed
while sampling span gas of known concentration. The first line of the display shows the
current CO concentration reading. The second line of the display shows the CO span
coefficient that is stored in memory and is being used to correct the CO concentration.
Notice that as the span coefficient value is changed using the
↑ and ↓ pushbuttons, the
current CO concentration reading on the first line also changes.
To display the CO Span Coefficient screen:
From the Main Menu choose Calibration Factors
From the Calibration Factors menu choose CO Coef
To use the CO Span Coefficient screen:
Use the ↑ and ↓ pushbuttons to increment/decrement the span coefficient
Press
ENTER
to accept a change
Press
MENU
to return to the Calibration Factors menu
Press
RUN
to return to the Run screen
Single and Dual/Auto range CO Span Coefficient Screen
CO PPM 51.4
CO COEF 1.000?
78 INC/DEC
HI CO -0.100
HI CO COEF 1.000
78 INC/DEC