Alarms
| 5-3
Level 1 Alarms
Alarm Timer Stopped
The analyzer has an internal 1 second clock to time the state
machine periods. This timer can be disabled via the service
menu. The alarm will persist until the timer is enabled.
Cell Temperature Alarm
The cell temperature is below its lower limit. Low cell tem-
perature may cause Sulfur mist to condense onto the optical
surfaces.
Demister Temperature
Alarm
The demister temperature is outside of its upper or lower lim-
its. The demister target temperature is 129 °C. Sulfur mist will
coalesce inside the demister and return to the process.
High Cell Pressure
Alarm
The cell pressure has exceeded its maximum value. A high
cell pressure indicates a possible blockage in the sample
path.
Cell RTD Failure
Demister RTD Failure
Flange RTD Failure
Heater RTD Failure
Heater OT Failure
These alarms indicate that an RTD temperature sensor has
failed.
Manifold Pressure
Alarm
The instrument air pressure is below the required pressure to
operate system pneumatic valves.
Flange Temperature
Alarm
The temperature at the input ange is low. This is a possible
plug condition as Sulfur may build up inside the ange.
Low Light Alarm
The light level at the four detectors has dropped below 50%
of the limit. The alarm usually indicates that the optical sur-
faces have been seriously fouled and require cleaning.
Level 2 Alarms
Zero Error Alarm
The light levels measured during a zero calibration are out-
side the upper or lower limits. This error will automatically be
cleared on a successful zero. The analyzer will use the zero
values from the previous successful zero until the next suc-
cessful zero calibration.
Span Calibration Error
The calculated span value is outside its upper or lower limits.
This error will automatically be cleared on a successful zero.
The analyzer will use the span values from the previous suc-
cessful span until the next successful span calibration.
Cell Flow Alarm
This error indicates that the automatic ow control is unable
to regulate cell ow. This occurs when the proportional valve
is at its maximum or minimum limit.
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