Figure 9-1. Flow Diagram, Internal O 2 Sensor - Thermo Scientific 410i Instruction Manual

Optional Equipment
Internal Oxygen (O2) Sensor
Internal O
Calibration
9-2 Model 410i Instruction Manual
Figure 9–1. Flow Diagram, Internal O
Sensor
This section describes how to calibrate the optional internal O
2
Be sure to power the analyzer for half an hour at normal operating
conditions (with the cover on) before calibration. The internal O
should be calibrated at the zero and span points, as described in the
following procedure.
Note The total airflow of the calibration gases must exceed the total
demand of the analyzer. The Model 410i requires approximately 1000
cc/min of sample flow, so a total airflow of at least 1100 cc/min is
recommended.
Use the following procedure to calibrate the oxygen sensor under normal
conditions. If you are unable to calibrate the oxygen sensor effectively using
the following procedure, use the Alternate Calibration Procedure.
Calibration Equipment:
Test gas: Nitrogen zero gas - span gas approximately 20% oxygen
concentration.
1. Supply the nitrogen zero gas to the SAMPLE port on the rear of the
analyzer and wait for the O
Sensor
2
▲
reading to stabilize.
2
sensor.
2
sensor
2
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