Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 218)

IM 11M12D01-01E 12-8
12.2.2 Alarm Displays
By touching the alarm icon when an alarm is generated, detailed alarm descriptions can
be displayed. Use the Next key to move to the next page if the alarm descriptions are
displayed in multiple pages. On the detailed alarm description display, touch the Update
key to update the alarm occurrence condition. When an error and an alarm occur at a
time, an error icon takes precedence.
Table12.2 Alarm Types and Occurrence/Cancellation Conditions
T12.2E.eps
Alarm Code Alarm Type Occurrence/Cancellation Conditions Unit to be
detected
Each channel
In auto or semi-auto calibration, cell voltage does not stabilize for
1 minute even after calibration time is up. Stabilization means that
margin of cell voltage fluctuation is within
Ϯ 0.1 mV and the state
continues for about 1 second. To stop alarm: Recalibrate. Stops
if the stabilization time falls within the normal range.
System
System
Measured oxygen concentration value exceeds or falls below
the preset alarm limits. For details, see sec 8.2, "Setting Oxygen
Concentration Alarms." Alarm 1 Oxygen
concentration
alarm
Each channel Alarm 2 Zero-point
calibration
coefficient alarm
In auto or semi-auto calibration, zero correction factor is outside
the range of 100
Ϯ 30%. See sec 9.1.3, "Compensation."
To stop alarm: Recalibrate. stops if the factor falls within the range.
Span correction factor is outside the range of 0 Ϯ 18%.
See sec.9.1.3, "Compensation"
To stop alarm: Recalibrate. stops if the factor falls within the range.
Alarm 3 Span-point
calibration
coefficient alarm
Alarm 4 EMF stabilization
time-up alarm
Each channel
Each channel
Alarm 5 Cold junction
temperature alarm Temperature of the cold junction placed in the detector terminal box
falls below -25
؇ C or exceeds 155 ؇ C.
To stop alarm: The cold junction temperature becomes a normal value.
Each channel
Alarm 6 Process gas alarm Averaging converter receives a signal of process gas alarm
at contact input.
To stop alarm: Contact input signal of process gas alarm is removed.
Alarm 7 Calibration gas
pressure low alarm Averaging converter receives a signal of calibration gas pressure low
alarm at contact input.
To stop alarm: Contact input signal of calibration gas pressure low
alarm is removed. System
Alarm 9 Inside temperature
alarm Internal temperature of the case exceeds limit. The limit is about 50 ؇ C
in terms of case ambient temperature. Occurrence/cancellation
time is recorded.
Alarm stops if: The internal temperature falls below the limit.
Calibration coefficient unstable. Alarm output if alarm enabled and
conditions in Sec. 12.2.3 7) are satisfied. Alarm 8 Asymmetry alarm Each channel