Teledyne API Model 200AH NOX Analyzer Instruction Manual, 06492, Rev. G2 9-9 Table 9-2: Front Panel Warning Messages Message Description
SYSTEM RESET Analyzer was reset/powered on. This warning occurs every
time the instrument is powered up, as in a power failure. It also
occurs if the RAM or EEPROM is reset.
RAM INITIALIZED RAM was erased. The RAM contains the DAS averages, which
get erased when the RAM is initialized. It also contains
temporary data used by the M200AH to calculate
concentrations. No setup variables are stored in the RAM.
SAMPLE FLOW WARN The calculated sample flow is outside the hi/low limits. Since
the flow is calculated, it probably means the pressure has gotten
too low. This warning can be caused by a plugged sample inlet.
AZERO WRN XXX.X MV AutoZero reading out of specification, XXX.X is actual
reading.
OZONE FLOW WARNING Ozone flow out of spec, warnings occur most often due to loss
of vacuum, which causes the ozone flow to go to zero. They
also can occur due to a flow sensor failure.
VACUUM WARNING Vacuum out of spec. warnings are caused by leaks, pump
failure or disconnected pump.
BOX TEMP WARNING Box temp out of spec. Instrument fan failure, enclosure
temperature failure. Operation of the M200AH in a too warm or
cold environment will cause degradation of data quality and
shorten the life of the instrument.
RCELL TEMP WARNING Reaction cell temp. out of spec. The warning message is most
often present during initial warm-up or if the connector to the
heaters is not plugged in after dis-assembly. It can also occur if
the thermistor is not in position in the reaction cell.
PMT TEMP WARNING PMT temp out of spec. The PMT temp has its own proportional
controller on the preamp board. Warnings sometimes occur
during initial operation. The warning can occur if the 7 pin
connector to the interior of the sensor is not plugged in. The test
points on the TEC control board should be checked for proper
voltage (+15 VDC 0.5).
CONV TEMP WARNING Converter temp. out of spec. The Converter temp is controlled
by the CPU. It has a thermocouple with amplifier on the
Status/Temp board. Because of the high temperature of the
converter (700°C) the temp warning will tend to be the last
warning to clear as the instrument is powered on.
(table continued)