Teledyne 6400A Instruction Manual page 47

Sulfur dioxide analyzer
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TAI Model 6400A SO
Analyzer Operator Manual, 02164, Rev. G
2
DC Power Supply (DCPS)
The DCPS voltage is a composite of the 5 and ±15VDC 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 2500mV ± 200mV.
Reaction Cell Temperature
This is a measurement of the temperature of the reaction cell. It is controlled by the computer to
o
50±1
C. Temperatures outside this range will cause the 6400A output to drift.
Box Temperature
This TEST function measures the temperature inside the chassis of the 6400A. The temperature
o
sensor is located on the Status/Temp Board. Typically it runs 2 to 10
C higher than the ambient
o
temperature. The 6400A 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.
o
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 SO
permeation tubes. The oven temperature is nominally 50C.
2
o
The actual temperature is stable to ± 0.1
C although it is normal to see the temperature on the
o
front panel move ± 0.3
C due to the proximity of the temperature 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 SO
2
permeation tube can be adjusted to a desired value. See Section 9.3.4 for information on
adjusting the IZS temperature.
Time
This is an output of the 6400A's internal time of day clock.
5-9

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