Instruction manual

SM425 INSTRUCTION MANUAL 12.0 TROUBLESHOOTING
192 42500001 REV A
Table 12-2 Types of Alarms and Causes
Alarm Type of alarm Cause
Alarm 1 Oxygen concentration alarm Generated when measured oxygen
concentration is outside of the user
programmed range (refer to Section 8.3,
“Setting Oxygen Concentration Alarms”).
Alarm 6 Zero-point calibration
coefficient alarm
Generated when the zero correction factor is
out of the 100 ±30 % r omatic and
semiautomatic calibration (refer to Section
ange in aut
9.1.3, “Calibration Curves”).
Alarm 7 Span-po
coefficient alarm
orrection factor is
out of the 0 ±18 % range in automatic and
semiautomatic calibration (refer to Section
9.1.3, “Calibration Curves”).
int calibration Generated when the span c
Alarm 8 EMF stabilization time-up Generated when the cell (sensor) voltage did
not stabilize during the calibration time in
automatic and semiautomatic calibration.
Alarm 10 Cold junction temperature
alarm
Generated when temperature of the cold
junction located in the detector terminal box is
out of the -25 °C to 155 °C range.
Alarm 11 Thermocouple voltage alarm Generated when thermocouple voltage is out of
the -5 mV to 42.1 mV range, (about -170 °C to
1020 °C).
Alarm 13 Battery low alarm Internal battery needs replacement.
Normal operation of the analyzer can not resume until an alarm condition is corrected. An alarm is
cleared only by a corrective action. An Alarm 10 and/or Alarm 11 may be generated at the same time as
Error-2 (heater temperature error). The Error-2 corrective action has priority over the Alarm 10 and/or
Alarm 11 corrective actions.
If the converter power is turned off after an alarm is generated and restarted before the cause of the
alarm has been eliminated, the alarm will be generated again. However, Alarms 6, 7, and 8 (calibration
alarms) are not generated unless calibration is executed.
12.2.2 Alarm Corrective Actions
12.2.2.1 Alarm 1: Oxygen Concentration Alarm
This alarm is generated when a measured value is outside of a user programmed range. For details on
the oxygen concentration alarm, see Section 1.47, “Setting Oxygen Concentration Alarms,” in the section
on operation.
12.2.2.2 Alarm 6: Zero-point Calibration Coefficient Alarm
In automatic or semiautomatic calibration, this alarm is generated when the zero correction factor is out of
the of 100 ± 30% range (refer to Section 1.51.3, “Calibration Curves”). An Alarm 6 may be caused by any
of the following:
1. The zero-gas oxygen concentration does not agree with the value set during “Calibration Setup.”
2. The zero-gas flow is out of the specified flow (600 ± 60 mL/min).