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Optional Hardware and Software Model GFC7001E Carbon Dioxide Analyzer
Teledyne Analytical Instruments 76
5.8.1.2. Operation within the GFC 7001E/EM Analyzer
The oxygen sensor option is transparently integrated into the core analyzer operation. All functions can be
viewed or accessed through the front panel, just like the functions for CO.
The O
2
concentration is displayed in the upper right-hand corner, alternating with CO concentration.
Test functions for O
2
slope and offset are viewable from the front panel along with the analyzer’s other test
functions.
O
2
sensor calibration is performed via the front panel CAL function and is performed in a nearly identical
manner as the standard CO calibration. See Section 9.7.1 for more details.
Stability of the O
2
sensor can be viewed via the front panel (see Section 9.7.1.3).
The O
2
concentration range is 0-100% (user selectable) with 0.1% precision and accuracy.
The temperature of the O
2
sensor is maintained at a constant 50° C by means of a PID loop and can be viewed
on the front panel as test function O
2
TEMP.
The O
2
sensor assembly itself does not have any serviceable parts and is enclosed in an insulated canister.
5.8.1.3. Pneumatic Operation of the O
2
Sensor
Pneumatically, the O
2
sensor draws a flow of 80 cm³/min in addition to the normal sample flow rate. It is
separately controlled with its own critical flow orifice.
Figure 5-15: GFC 7001E/EM – Internal Pneumatics with O
2
Sensor Option 65A