NS 5.14 Firmware
2
–
42
4900002262 rev. B 3-23-21
Warnings
Warnings messages appear on the front panel LCD and are transmitted via RS-
232. Warnings may include one or more of the following:
•
Fitting Out of Range
: This warning occurs when the system is
unable to adequately fit a curve to the measured signal typically as a
result of too much noise in the signal or an unexpected gas mixture
in the measurement cell.
•
Peak Tracking
: This warning indicates when a peak tracking
correction has occurred.
Alarms
The analyzer is equipped with three dry contact relays that indicate a system
fault or alarm state, the
General Fault Alarm
relay, the user
Assignable
Alarm
relay and the
Validation Fail Alarm
relay. Refer to the system
drawings for this analyzer for relay assignments. In addition, alarm and fault
messages appear on the front panel LCD and are transmitted via RS-232.
System faults
The
General Fault Alarm
is triggered by system faults, which cause the
General Fault Alarm
relay to be activated and the current loop to respond
according to the
4-20mA Alarm Option
setting. Once activated, the
General
Fault Alarm
can be reset via the
General Alarm DO
parameter (see
“Changing Measurement and Control Parameters”
System faults include one or more of the following:
•
Fitting Restart Alarm
: This fault occurs when the number of
consecutive system restarts caused by the system’s inability to
adequately fit a curve to the measured signal exceeds a pre-set limit.
•
Flow Switch Alarm
: This fault occurs on systems with a digital input
flow switch enabled and the digital input triggers the alarm state.
•
Laser Curnt High Alrm
: This fault occurs when the laser current
goes above the maximum allowable indicating a potential problem
with the laser.
•
Laser Curnt Low Alrm
: This fault occurs when the laser current
goes below the minimum allowable indicating a potential problem
with the laser.
•
Laser Power High Alrm
: This fault occurs when the DC signal is
saturated typically as a result of the absence of absorbing gas in the
sample cell.
•
Laser Power Low Alrm
: This fault occurs when the DC signal
becomes too weak for a reliable measurement typically as a result of
mirror contamination.
•
Laser Zero High Alarm
: This fault occurs if the detector signal value
is above the set normal range when the laser is turned off.
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