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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
High Voltage Power Supply (HVPS)
The HVPS reading is a measure of the scaled-up HVPS programming voltage. The voltage used
to set the HVPS output is generated on the Preamp board. Its value is between 0 and 1 volt,
corresponding to a voltage of 0 to 1000 volts out of the HVPS. The HVPS front panel TEST
measurement should be greater than 450 volts and will typically be around 600-800V.
DC Power Supply (DCPS)
The DCPS voltage is a composite of the 5 and ± 15 VDC voltages in the Power Supply Module.
This is meant to be a quick indicator to show if the PSM is working correctly. The nominal value
is 2500 mV ± 200 mV.
Reaction Cell Temperature
This is a measurement of the temperature of the reaction cell. It is controlled by the computer to
50 ± 1 C. Temperatures outside this range will cause the M200A output to drift.
Box Temperature
This TEST function shows the temperature inside the chassis of the M200A. The temperature
sensor is located on the Status/Temp Board. Typically it runs 2 to 10 C higher than the ambient
temperature. The M200A has been engineered to maintain stable output over 5 to 40 C ambient
temperature range.
PMT Temperature
The temperature of the PMT is closely controlled by a dedicated proportional temperature
controller. The nominal set-point is 7 ± 1 C. Readings outside this range will cause instrument
drift due to gain changes in the PMT detector.
IZS Temperature
The IZS option has an oven for NO
2
permeation tubes. The oven temperature is nominally 50 C.
The permeation tube temperature is stable to ± 0.1 C, although it is normal to see the
temperature on the front panel move ± 0.4 C due to the proximity of the temp sensor to the
heater. It can be adjusted from the front panel by pressing SETUP-MORE-VARS and selecting
the IZS_SET item and entering the desired temperature. Using this adjustment, the permeation
rate of the NO
2
permeation tube can be adjusted to a desired value. See Section 6.3 for
information on adjusting the IZS temperature.
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