No 2 À No Converter - Teledyne T200 User Manual

NO à NO CONVERTER
2
Provided that oxygen was present in the Sample stream during operation for the NO
converter to function properly, the NO
• An electrical failure of the band heater and/or the thermocouple control circuit and;
A performance failure of the converter itself.
•
NO à NO C
2
NO converter heater failures can be divided into two possible categories:
2
• Temperature is reported properly but heater does not heat to full temperature.
o
• Temperature reports zero or overload (near 500° C).
o
o
083730200A DCN7962
E
ONVERTER LECTRICAL
In this case, the heater is either disconnected or broken or the power relay is
broken.
Disconnect the heater cable coming from the relay board and measure the
•
resistance between any two of the three heater leads with a multi-meter.
The resistance between A and B should be about 1000 Ω.
•
The resistance between A and C should be the same as between B and C,
•
about 500 Ω each.
If any of these resistances is near zero or without continuity, the heater is
•
broken.
This indicates a disconnected or failing thermocouple or a failure of the
thermocouple circuit.
• Check that the thermocouple is connected properly and the wire does not show
signs of a broken or kinked pathway.
If it appears to be properly connected, disconnect the yellow thermocouple plug
•
(marked K) from the relay board and measure the voltage (not resistance)
between the two leads with a multi-meter capable of measuring in the low mV
range.
The voltage should be about 12 mV (ignore the sign) at 315° C and about 0 mV
•
at room temperature.
Measure the continuity with an Ohm-meter.
It should read close to zero Ω. If the thermo-couple does not have continuity, it
•
is broken.
If it reads zero voltage at elevated temperatures, it is broken.
•
Teledyne API T200 NO/NO
converter assembly can fail in two ways:
2
F
AILURE
/NO Analyzer with NumaView™ Software
2 x
2
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