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Teledyne API – Model T400 O
3
Analyzer
083730400A DCN8130
5.7.8.1 BOX TEMPERATURE
The box temperature sensor is mounted to the motherboard and cannot be disconnected to
check its resistance. Rather check the
BOX TEMP
signal using the signal voltage in the
Utilities>Diagnostics>Analog Inputs menu (Section 5.7.3). This parameter will vary
with ambient temperature, but at ~30
o
C (6-7° above room temperature) the signal should
be ~1450 mV.
5.7.8.2 SAMPLE TEMPERATURE
Sample Temperature should read approximately 5.0
°
C higher than the box temperature.
5.7.8.3 UV LAMP TEMPERATURE
There are three possible causes for the UV Lamp temperature to have failed.
•
The UV Lamp heater has failed.
•
Check the resistance between pins 5 and 6 on the six-pin connector adjacent to the
UV Lamp on the Optical Bench.
•
It should be approximately 30 Ohms.
•
Assuming that the I
2
C bus is working and that there is no other failure with the Relay
Board, the FET Driver on the Relay Board may have failed.
•
Using the
PHOTO_LAMP_HEATER
parameter under the
SIGNAL I/O
function of
the
DIAG
menu, as described above, turn on and off the UV Lamp Heater (D15 on
the relay board should illuminate as the heater is turned on).
•
Check the DC voltage present between pins 1 and 2 on J13 of the Relay Board.
•
If the FET Driver has failed, there will be no change in the voltage across pins 1 and
2.
•
If the FET Driver Q2 checks out OK, the thermistor temperature sensor in the lamp
assembly may have failed.
•
Unplug the connector to the UV Lamp Heater/Thermistor PCB, and measure the
resistance of the thermistor between pins 5 and 6 of the six-pin connector.
The resistance near the 58
o
C set point is ~8.1k ohms.
5.7.8.4 IZS OZONE GENERATOR TEMPERATURE (OPTIONAL)
There are three possible causes for the Ozone Generator temperature to have failed.
•
The O
3
Gen heater has failed.
•
Check the resistance between pins 5 and 6 on the six-pin connector adjacent to the
UV Lamp on the O
3
Generator.
•
It should be approximately 5 Ohms.
Содержание T400
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