Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J1
9.4 Troubleshooting Using Test Function Values
The Model 401 Photometric Calibrator provides the capability to display, on operator demand,
the values of Test Functions which allow the observation of key analyzer operating parameters.
These Test Functions can be accessed by depressing the TEST Button on the instrument's front
panel, with each depression of the button causing the next test function to be displayed. By
comparing the values of Test Functions to acceptable operating limits, it is possible to quickly
isolate and correct most problems.
Table 9-2 provides a list of available Test Functions along with their meaning, their range of
acceptable values, and the recommended corrective actions if the value is not in the acceptable
range. Additionally, Table 1-1 in this manual provides a list of the values of all Test Functions at
the time the analyzer left the factory.
Table 9-2: Test Function Values
Test
Function
Meaning
Acceptable Values
Corrective Action for
Unacceptable Values
RANGE
The Full Scale Range of the
analyzer's analog outputs in
PPB.
Any between 100 -
10000 PPB
None required.
O
3
MEAS
The most recent detector
reading taken in Measure
mode (i.e. with sample gas
bypassing the Ozone
Scrubber).
2500-4700 mV
Check and adj source lamp
and UV det as described in
Section 9.6.6.
O
3
REF
The most recent detector
reading taken in Reference
mode (i.e. with sample gas
passing through the Ozone
Scrubber).
2500-4700 mV
Check and adj source lamp
and UV det as described in
Section 9.6.6.
O
3
GEN
The reading from the O
3
GEN lamp reference
detector.
75-175 mV with O
3
gen off >75 mV with
O
3
gen on.
Check and adjust the IZS lamp
and reference detector as
described in Section 8.10.
PRES
The absolute pres of the
sample gas in the absorption
cell.
0"-1.0" Hg below
ambient pressure
Check for pneumatic system
problems. See Section 9.6.1.
Check for pressure transducer
problems. See Section 9.6.5.
(table continued)
9-5
