Optional Equipment
Internal Oxygen (O2) Sensor
Thermo Fisher Scientific
Model 48
i
Instruction Manual
9-3
2.
From the Main Menu choose Calibration >
Calibrate O
2
Background
and press
to set the O
2
background to zero.
3.
Supply the O
2
Span gas to the SAMPLE port on the rear of the
analyzer and wait for the O
2
reading to stabilize.
4.
From the Main Menu choose Calibration >
Calibrate O
2
Coefficient
,
enter the span concentration, and press
to set the O
2
coefficient.
Note
If you were unable to calibrate the oxygen sensor effectively using
this procedure, recalibrate using the “Alternate Sensor Calibration”
procedure that follows.
▲
Use the following procedure if the standard calibration procedure described
previously fails to calibrate properly or for high altitude (5000m/15400 ft)
calibration.
1.
Supply the nitrogen zero gas to the SAMPLE port on the rear of the
analyzer.
2.
From the Main Menu choose Calibration Factors >
O
2
Background
,
set the O
2
background to zero, and press
to set the O
2
background.
3.
Use the screwdriver to adjust zero potentiometer RV1 such that the O
2
value reads 0.00% O
2
.
4.
Use the screwdriver to adjust the span potentiometer RV2 fully
clockwise.
5.
Supply the O
2
span gas to the SAMPLE port on the rear of the
analyzer.
6.
From the Main Menu choose Calibration Factors >
O
2
Coefficient
, set
the O
2
coefficient to 1.000, and press
to set the O
2
coefficient.
7.
Use the screwdriver to adjust the coarse span potentiometer RV3 such
that the O
2
reading is 20% greater than the calibration gas value. For
example, 25% O
2
span gas should be set to produce an output of
30.00% O
2
.
Alternate Sensor
Calibration
