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Principles of Operation Teledyne API - T100 UV Fluorescence SO2 Analyzer
310
This measurement is stored in the analyzer. Memory as the test function PMT TEMP
and is viewable as a test function (refer to Section 4.1.1) through the analyzer’s front
panel.
SAMPLE GAS PRESSURE SENS
OR: This sensor m
easures the gas pressure at the
exit of the sample chamber.
SAMPLE FLOW SENSOR: This sensor measure the flow rate of the sample gas as it
exits the sample chamber.
13.5.8.3. THERMISTOR INTERFACE
This circuit provides excitation, termination and signal selection for several negative-
coefficient, thermistor temperature sensors located inside the analyzer. They are as
follows:
SAMPLE CHAMBER TEMPERATURE SENSOR: The source of this signal is a
thermistor imbedded in the of the sample chamber block. It measures the temperature of
the sample gas in the chamber. The data are used by the CPU to control sample chamber
the heating circuit and as part of the SO
2
, calculations when the instrument’s
Temperature/Pressure Compensation feature is enabled.
This measurement is stored in the analyzer. Memory as the Test Function RCEL TEMP
and is viewable as a test function (refer to Section 4.1.1) in the analyzer’s front panel
display.
IZS OP
TION PERMEATION TUBE TEMPERATURE SENSOR: This thermistor,
attached to the permeation tube in the IZS option, reports the current temperature of that
tube to the CPU as part of control loop that keeps the tube at a constant temperature.
BOX TEMPERATURE SENSOR: A thermistor is attached to the motherboard. It
measures the analyzer’s internal temperature. This information is stored by the CPU and
can be viewed by the user for troubleshooting purposes through the front panel display.
This measurement is stored in the analyzer‘s memory as the test function BOX TEMP
and is viewable as a test function (refer to Section 4.1.1) in the analyzer’s front panel
display.
13.5.9. ANALOG OUTPUTS
The analyzer comes equipped with four Analog Outputs: A1, A2, A3 and a fourth that is
a spare.
A1 and A2 Outputs: The first two, A1 and A2 are normally set up to operate in parallel
so that the same data can be sent to two different recording devices. While the names
imply that one should be used for sending data to a chart recorder and the other for
interfacing with a data logger, either can be used for both applications.
Both of these channels output a signal that is proportional to the SO
2
concentration of
the sample gas. The A1 and A2 outputs can be slaved together or set up to operated
independently. A variety of scaling factors are available; refer to Section 5.4 for
information on setting t
he range type and Section 5.9.3 for adjusting the electronic
scaling factors of these output channels
Test Output
: The third analog output, labeled A3 is special. It can be set by the user
(refer to Section 5.9.9) to carry the signal level of any one of the parameters accessible
throug
h the TE
ST menu of the unit’s software.
06807C DCN6650