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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 269
12.2. USING THE ANALOG OUTPUT TEST CHANNEL
The signals available for output over the 9110T’s analog output channel can also be used as diagnostic
tools. See Section 5.9.2 for instruction on activating the analog output and selecting a function.
Table 12-3: Test Channel Outputs as Diagnostic Tools
TEST
CHANNEL
DESCRIPTION ZERO
FULL
SCALE
CAUSES OF EXTREMELY
HIGH / LOW READINGS
PMT
DETECTOR
The output of the PMT
detector converted to a 0
to 5 VDC scale.
0 mV 5000 mV
Failed PMT
PMT Temperature too High/Low
Bad PMT Preamp PCA
Failed HVPS
Misadjusted HVPS drive Voltage
Light Leak in reaction cell
OZONE
FLOW
The flow rate of O
3
through the analyzer as
measured by the O
3
flow
sensor
0
cm
3
/min
1000
cm
3
/min
Check for Gas Flow problems in the O
3
gas lines.
SAMPLE
FLOW
The calculated flow rate
for sample gas through
the analyzer.
0
cm
3
/min
1000
cm
3
/min
Check for Gas Flow problems in the sample gas lines.
SAMPLE
PRESSURE
The pressure of the
sample gas measured
upstream of the Auto
Zero Valve
0 In-Hg-A 40 In-Hg-A
Check for Gas Flow problems in the sample gas lines.
RCELL
PRESSURE
The pressure of gas
inside the reaction cell of
the sensor module
0 In-Hg-A 40 In-Hg-A
Check for Gas Flow problems in all gas lines.
RCELL TEMP
The temperature of gas
inside the reaction cell of
the sensor module
0 C 70 C
Same as RCELL TEMP WARNING in Table 12-1.
IZS TEMP
The temperature of the
permeation tube oven of
the optional internal span
gas generator.
0 C 70 C
Same as IZS TEMP WARNING in Table 12-1.
CONV TEMP
The temperature NO
2
NO converter
0 mV 5000 mV
Same as CONV TEMP WARNING in Table 12-1.
PMT TEMP
The temperature inside
PMT
0 C 50 C
Same as PMT TEMP WARNING in Table 12-1.
BOX TEMP
The temperature inside
the 9110T’s chassis
0 C 70 C
Same as BOX TEMP WARNING in Table 12-1.
HVPS
VOLTAGE
Represents the output
voltage of the PMT's high
voltage power supply
0 mV 5000 mV
Same as HVPSWARNING in Table 12-1.