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Teledyne API - Model T200H/T200M Operation Manual Principles of Operation
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Figure 8-14: Oxygen Sensor - Principle of Operation
8.4.2. OPERATION WITHIN THE T200H/M 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
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
2
sensor can be viewed (see 3.3.2.1)
The O
2
concentration range is 0-100% (user selectable) with 0.1% precision and accuracy
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
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 O2 TEMP .
The O
2
sensor assembly itself does not have any serviceable parts and is enclosed in an
insulated canister.
8.4.3. PNEUMATIC OPERATION OF THE O
2
SENSOR
Pneumatically, the O
2
sensor is connected after the particulate filter and draws a flow of
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.
07270D DCN7141