Alarms
| Appendix E-1
ALARMS
Alarm Severity
Level 1 Alarms
This is the highest level or severity of alarm. A Level 1 alarm indicates
either a hardware failure or a system error that prevents the analyzer
from making a valid H
2
S or SO
2
concentration measurement. The analyzer
needs immediate attention to correct the cause of the alarm before normal
operation can resume.
A Level 1 alarm opens the System Alarm and Data Valid contacts. The
state machine jumps to the Not Ready state (Period 2) and the period
timer is stopped until the alarm condition is cleared.
Hardware Alarms
Hardware alarms indicate a component failure. A part may need to be
replaced in order to correct the problem. Hardware alarms include:
• Defective Sample Cell Temperature Sensor (RTD)
• Defective Demister Temperature Sensor (RTD)
• Defective Flange Temperature Sensor (RTD)
• Defective Oven Heater Temperature Sensor (RTD)
• Defective Oven Heater Over-temperature Sensor (RTD)
• Defective EEPROM
• Loss of communications between the sensor (883047901) and detector
(883048901) assemblies.
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