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Assuming that the I
Power distribution board, the FET Driver on the Power distribution board may
have failed.
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If the FET Driver Q2 checks out OK, the thermistor temperature sensor in the
lamp assembly may have failed.
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Ozone Generator Temperature
There are three possible causes for the Ozone Generator temperature to have failed.
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T
8.5.
ROUBLESHOOTING THE
D
YNAMIC
Dynamic problems only manifest when the photometer is measuring O
mixtures. These can be the most difficult and time-consuming to isolate and resolve.
Since many photometer behaviors that appear to be a dynamic in nature are often a
symptom of a seemingly unrelated static problems, it is recommended that dynamic
problems not be addressed until all static problems, warning conditions and subsystems
have been checked and any problems found are resolved.
Once this has been accomplished, the following most common dynamic problems should
be checked.
083730750B DCN8606
2
C bus is working and that there is no other failure with the
Using the PHOTO_LAMP HEATER parameter in the Utilities>Diagnostics
menu, as described above, turn on and off the UV Lamp Heater (D15 on the
power distribution board should illuminate as the heater is turned on).
Check the DC voltage present between pin 1 and 2 on J13 of the Power
distribution board.
If the FET Driver has failed, there will be no change in the voltage across
pins 1 and 2.
Unplug the connector to the UV Lamp Heater/Thermistor PCB, and measure
the resistance of the thermistor between pins 5 and 6 of the 6-pin connector.
The resistance near the 58
The O
generator heater has failed. Check the resistance between pins 5
3
and 6 on the 6-pin connector adjacent to the UV Lamp on the O
It should be approximately 5 Ohms.
Assuming that the I
2
C bus is working and that there is no other failure with
the Power distribution board, the FET Driver on the Power distribution board
may have failed. Using the O3_GEN_HEATER parameter in the
Utilities>Diagnostics menu, as described above, turn on and off the UV
Lamp Heater. Check the DC voltage present between pin 1 and 2 on J14 of
the Power distribution board.
If the FET Driver has failed, there should be no change in the voltage across
pins 1 and 2.
If the FET Driver checks out OK, the thermistor temperature sensor in the
lamp assembly may have failed. Unplug the connector to the Ozone
Generator Heater/Thermistor PCB, and measure the resistance of the
thermistor between pins 5 and 6 of the 6-pin connector.
O
P
HOTOMETER
3
P
O
ROBLEMS WITH THE
o
C set point is ~8.1k ohms.
P
HOTOMETER
3
Generator.
3
concentration gas
3
149
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Table of Contents
Troubleshooting
