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Teledyne API - Model T200H/T200M Operation Manual
8.4.2. OPERATION WITHIN THE T200H/M ANALYZER
8.4.3. PNEUMATIC OPERATION OF THE O
07270D DCN7141
Figure 8-14:
Oxygen Sensor - Principle of Operation
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
NO
.
X
•
The O2 concentration is displayed in the upper right-hand corner, alternating with
NOX, NO and NO2 concentrations.
•
Test functions for O2 slope and offset are viewable from the front panel along with
the analyzer's other test functions.
•
O2 sensor calibration is performed via the front panel CAL function and is performed
in a nearly identical manner as the standard NOX/NO calibration. See Section 5 for
more details.
•
Stability of the O
sensor can be viewed (see 3.3.2.1)
2
The O
concentration range is 0-100% (user selectable) with 0.1% precision and accuracy
2
and is available to be output via one of the instrument's four user selectable analog
outputs (see Section 4.13.5).
The temperature of the O
loop and can be viewed on the front panel as test function O2 TEMP.
The O
sensor assembly itself does not have any serviceable parts and is enclosed in an
2
insulated canister.
Pneumatically, the O
sensor is connected after the particulate filter and draws a flow of
2
about 80 cm³/min in addition to the normal sample flow rate (See Table 8-3 for nominal
sample inlet gas flow rates) and is separately controlled with its own critical flow orifice
located inside the vacuum manifold.
sensor is maintained at a constant 50° C by means of a PID
2
SENSOR
2
Principles of Operation
287
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