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07271B DCN6646 33
5.0 ALARMS AND CAUTIONS
Please refer to the T200 Operation Manual for a functional block diagram
of the analyzer.
5.1 ALARM
During initial warm up the internal Zero/Span factory option may exhibit a
“Block Temperature” warning. This can be cleared once the block
temperature stabilizes at 50 degrees Celsius. The block temperature is the
actual temperature of the IZS block manifold inside the M501 NH
3
converter. If the block temperature warning exhibits a negative number such
as (-37), then the umbilical cord is probably not attached or the Thermistor
has become disconnected.
5.2 CAUTION
Be aware that the
ammonia converter operates at 825 degrees Celsius. Do
not flow highly flammable gases through the T201 analyzer. When the
analyzer is not in use, it is advisable to turn off the M501 NH
3
. If the
converter hasn’t been powered for an extended period of time it is
recommend that the analyzer be operated overnight prior to use.
Before spanning the analyzer it is good practice to observe the NORM
PMT signal. Its value should be equal to twice the concentration of the
delivered span gas. A common error made during calibration is to span the
analyzer with either too low a gas concentration or an incorrect value
entered into the CONC menu for TNx and NOx. Commonly this will
cause a slope value much greater than one.
Note
As a basic rule, always zero first, then span.