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Teledyne API – Model T700 Dynamic Dilution Calibrator Troubleshooting and Service
245
Table 9-2: Test Functions – Indicated Failures
TEST FUNCTION DIAGNOSTIC RELEVANCE AND CAUSES OF FAULT CONDITIONS.
O3GENREF
1
Particularly important in calibrators without the optional O
3
photometer since the reference
detector is the primary input for controlling O
3
concentration.
Possible causes of faults are the same as O3 GEN REFERENCE WARNING from Table 9-1.
O3FLOW
1
Gas flow problems directly affect the concentration accuracy of the T700’s calibration gas
mixtures.
- Check for Gas Flow problems.
O3GENDRV
1
Check the O
3
generator heater and temperature sensors.
Possible causes of faults are the same as O3 GEN LAMP TEMP WARNING
from Table 9-1.
O3LAMPTMP
1
Incorrect Lamp temperature can affect the efficiency and durability of the O
3
generators UV
lamp.
Possible causes of faults are the same as O3 GEN LAMP TEMP WARNING from Table 9-1.
CAL PRES
Affects proper flow rate of Cal gas MFCs.
Possible causes of faults are the same as MFC PRESSURE WARNING from Table 9-1.
DIL PRES
Affects proper flow rate of Diluent gas MFCs.
Possible causes of faults are the same as MFC PRESSURE WARNING from Table 9-1.
REG PRES
Same as REGULATOR PRESSURE WARNING from Table 9-1.
BOX TMP
If the Box Temperature is out of range, ensure that the:
Box Temperature typically runs ~7C warmer than ambient temperature.
- The Exhaust-Fan is running.
- Ensure there is sufficient ventilation area to the side and rear of instrument to allow
adequate ventilation.
PH MEAS
2
&
PH REF
2
If the value displayed is too high the UV Source has become brighter. Adjust the variable gain
potentiometer on the UV Preamp Board in the optical bench.
If the value displayed is too low:
- < 200mV – Bad UV lamp or UV lamp power supply.
- < 2500mV – Lamp output has dropped, adjust UV Preamp Board or replace lamp.
If the value displayed is constantly changing:
- Bad UV lamp.
- Defective UV lamp power supply.
- Failed I
2
C Bus.
If the PHOTO REFERENCE value changes by more than 10mV between zero and
span gas:
- Defective/leaking switching valve.
PH FLW
2
Gas flow problems directly affect the accuracy of the photometer measurements and therefore
the concentration accuracy of cal gas mixtures involving O
3
and GPT mixtures.
- Check for Gas Flow problems.
PH LTEMP
2
Poor photometer temp control can cause instrument noise, stability and drift. Temperatures
outside of the specified range or oscillating temperatures are cause for concern.
Possible causes of faults are the same as PHOTO LAMP TEMP WARNING
from Table 9-1.
PH PRES
2
The pressure of the gas in the photometer’s sample chamber is used to calculate the
concentration of O
3
in the gas stream. Incorrect sample pressure can cause inaccurate
readings.
- Check for Gas Flow problems. See Section Table 9-1.
06873B DCN6388