Teledyne T200 Operation Manual page 260

Troubleshooting & Service
ATTENTION
If the thermocouple is broken, do NOT replace the thermocouple without first
consulting the factory; using the wrong Type could cause permanent damage to
the instrument. The Type K thermocouple has a red and a yellow wire. If in doubt,
consult the factory.
12.7.10.2. NO CONVERSION EFFICIENCY
2
258
Teledyne API – T200 NO/NO2/NOx Analyzer Operation Manual
That 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.

Temperature reports zero or overload (near 500° C).

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.

To test the thermocouple at room temperature, heat up the converter can (e.g., with
a heat gun) and see if the voltage across the thermocouple leads changes.

If the thermocouple is working properly, the electronic circuit is broken.
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
The efficiency at which the NO
the accuracy of the T200‟s NO
includes a Converter Efficiency (CE) gain factor that is multiplied by the NO
measurements to calculate the final concentrations for each. This gain factor is stored in
the analyzer‟s memory.
The default setting for the NO
molybdenum in the NO
converting NO into NO.
2
To ensure accurate operation of the T200, it is important to check the NO
efficiency periodically and to update this value as necessary.

For the analyzer to function correctly, the converter efficiency must be greater than
0.9600 (96% conversion efficiency) as per US-EPA requirements.

If the converter's efficiency is below this limit, the NO

The current converter efficiency level is also recorded along with the calibration data
in the DAS for documentation and performance analysis (Section 7).
 NO converter changes NO
2
, NO and NO
x
converter efficiency is 1.0000.
2
 NO converter oxidizes and it becomes less efficient at
2
into NO directly effects
2
measurements. The T200 firmware
2
Over time, the
converter should be replaced.
2
06858E DCN7057
and NO
2 X
conversion
2