Troubleshooting Using Test Function Values; Table 9-2: Test Function - Teledyne 401 Instruction Manual

Teledyne API Model 401 O

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
Meaning
Function
RANGE The Full Scale Range of the
analyzer's analog outputs in
PPB.
O MEAS The most recent detector
3
reading taken in Measure
mode (i.e. with sample gas
bypassing the Ozone
Scrubber).
O REF The most recent detector
3
reading taken in Reference
mode (i.e. with sample gas
passing through the Ozone
Scrubber).
O GEN The reading from the O
3
GEN lamp reference
detector.
PRES The absolute pres of the
sample gas in the absorption
cell.
(table continued)
Photometric Calibrator Instruction Manual, 01124, Rev. J1
3
Acceptable Values
Any between 100 -
10000 PPB
2500-4700 mV
2500-4700 mV
75-175 mV with O
3
gen off >75 mV with
O
3
0"-1.0" Hg below
ambient pressure
9-5
Corrective Action for
Unacceptable Values
None required.
Check and adj source lamp
and UV det as described in
Section 9.6.6.
Check and adj source lamp
and UV det as described in
Section 9.6.6.
Check and adjust the IZS lamp
3
and reference detector as
gen on. described in Section 8.10.
Check for pneumatic system
problems. See Section 9.6.1.
Check for pressure transducer
problems. See Section 9.6.5.