Teledyne API Model 200A NOX Analyzer Instruction Manual, 02246, Rev. G, DCN 5247 Test Function Factory Set-Up Comment
AZERO Check value in
Final Test Values
Table 2-2-6
AZERO is the current value of the AutoZero circuit reading.
Values are typically 0 mV -20/+150. For values outside this range,
check the AutoZero and NO/NOx valve for cross port leaks. Use
Diagnostic mode to manually check the AutoZero valve for
correct operation.
HVPS 450-900 VDC This represents the scaled-up HVPS programming voltage to the
HVPS. The design of the HVPS precludes taking a single reading
that indicates the health of the supply. Refer to the HVPS
Troubleshooting Section 9.3.8.5 for a procedure for testing the
HVPS. This TEST function is used primarily to set the HVPS
voltage value. A value not in the 450 to 900 volt range indicates
problems with the HVPS supply.
DCPS 2500 ± 200 mV DCPS is a composite of the +5 and ± 15 VDC supplies. It has
been arbitrarily set at 2500 ± 200 mV. If it is not in this range one
of the voltages in the supply is not working. Check the procedures
for diagnosing the Power Supply Module in Section 9.3.5.
RCELL TEMP 50 ± 1 C The reaction cell temperature is controlled to 50 C ± 1 C by the
computer. It should only read other values when the instrument is
warming up. If the value is outside the acceptable range, go to the
procedure for diagnosing the Reaction cell temp supply in Section
9.3.8.2. The alarm limits are less than 45 C and greater than
55 C.
BOX TEMP 8-48 C The Box Temp is read from a thermistor on the Status/Temp board
(01086). It should usually read about 5 C above room temp. The
M200A is designed to operate from 5 to 40 C ambient. Therefore
the box temperature should be in the range of about 10 to 50 C.
Temperatures outside this range will cause premature failures of
components, and poor data quality. Warning limits are < 8 C and
> 48 C.
PMT TEMP 7 ± 1 C The PMT detector is very temperature sensitive. The PMT
temperature should always be 7 C, except at power-up.
Temperatures more than ±1 C from the set point indicate
problems with the cooler circuit. See Section 9.3.8.4 for PMT
cooler diagnostic and troubleshooting. Warning limits are < 5 C
and > 15 C.
MOLY TEMP 315 ± 5 C Moly temp is controlled by the CPU to 315 C. After cold start it
requires about 30 min to come to temperature. After temperature is
reached temperature should not vary more than ± 5 C. See
Section 9.3.4 for troubleshooting. Warning limits are < 290 C and
> 320 C.
(table continued)
9-6 PRINTED DOCUMENTS ARE UNCONTROLLED