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Troubleshooting and Service
8.4. OTHER PERFORMANCE PROBLEMS
8.4.1. Temperature Problems
8.4.1.1. BOX OR SAMPLE TEMPERATURE
Box Temperature
Sample Temperature
8.4.1.2. BENCH TEMPERATURE
244
Dynamic problems (i.e. problems which only manifest themselves when the
analyzer is monitoring sample gas) can be the most difficult and time consuming
to isolate and resolve. The following provides an itemized list of the most
common dynamic problems with recommended troubleshooting checks and
corrective actions.
Individual control loops are used to maintain the set point of the absorption
bench, filter wheel, and IR photo-detector temperatures.
temperatures are out of range or are poorly controlled, the T360 will perform
poorly.
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 I/O function under the DIAG Menu (See Section 8.1.3). This
parameter will vary with ambient temperature, but at ~30
temperature) the signal should be ~1450 mV.
The Sample Temperature should closely track the bench temperature. If it does
not, locate the sensor, which is located at the midpoint of the optical bench in a
brass fitting. Unplug the connector labeled "Sample", and measure the resistance
of the thermistor; at room temperature (25°C) it should be ~30K Ohms, at
operating temperature, 48°C, it should be ~ 12K Ohms
There are three possible failures that could cause the Bench temperature to be
incorrect.
HAZARDOUS VOLTAGES ARE PRESENT DURING THIS TEST
1. The heater mounted to the bottom of the Absorption bench is electrically
shorted or open. Check the resistance of the two heater elements by
measuring between pin 2 and 4 (~76 Ohms), and pin 3 and 4 (~330 Ohms),
of the white five-pin connector just below the sample temperature sensor on
the Bench (pin 1 is the pointed end).
2. Assuming that the I
the relay board, the solid-state relay (K2) on the relay board may have failed.
Teledyne API Model T360/T360M Operation Manual
WARNING:
2
C bus is working and that there is no other failure with
If any of these
o
C (6-7° above room
07272B DCN6552
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