Teledyne T200 Operation Manual page 308

Principles of Operation
306
Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
HIGH VOLTAGE POWER SUPPLY LEVEL: The PMT high voltage is based on
the drive voltage from the preamplifier board. It is digitized and sent to the CPU where
it is used to calculate the voltage setting of the HVPS.

The value of this signal is viewable via the front panel test function HVPS and the
SIGNAL I/O function HVPS_VOLTAGE.

It is recorded by the DAS system as the parameter HVPS.
PMT TEMPERATURE: The PMT temperature is measured with a thermistor inside
the PMT cold block. Its signal is amplified by the PMT temperature feedback circuit on
the preamplifier board and is digitized and sent to the CPU where it is used to calculate
the current temperature of the PMT.

The value of this signal is viewable via the front panel test function PMT TEMP and
the SIGNAL I/O function PMT_TEMP.

It is recorded by the DAS system as the parameter PMTTMP.
SAMPLE GAS PRESSURE SENSOR: This sensor, located on the flow/pressure
sensor PCA, measures the gas pressure in the sample chamber upstream of the sample
gas stream flow control assembly. Its functions are described in Section 13.2.4.1.

The value of this signal is viewable via the front panel test function SAMP and the
SIGNAL I/O function SAMPLE_PRESSURE.

It is recorded by the DAS system as the parameter SMPPRS.
VACUUM PRESSURE SENSOR: This sensor, also located on the flow/pressure
sensor PCA, is pneumatically located downstream from the reaction cell and measures
the pressure of the gas mixture inside the reaction cell . Its functions are described in
Section 13.2.4.2.

The value of this signal is viewable via the front panel test function RCEL and the
SIGNAL I/O function RCEL_PRESSURE.

It is recorded by the DAS system as the parameter RCPRES.
O FLOW SENSOR: This sensor, located on the flow/pressure sensor PCA, measures
3
the flow rate of the O gas stream as it is supplied to the reaction cell. Its functions are
3
described in Section 13.2.4.4.

The value of this signal is viewable via the front panel test function OZONE FLOW
and the SIGNAL I/O function OZONE_FLOW.

It is recorded by the DAS system as the parameter O3FLOW.
06858E DCN7057