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250 Alarm log
Section 6: Meter operation Reference, Installation, and Operations Manual
June 2013 3-9000-743 Rev S
6.6.4 Alarm log
The Mark III meter monitors several data points with respect to each point’s alarm limit(s). Non-
boolean data points can have low and high alarm limits. Boolean data points only have a single
alarm limit (i.e., either TRUE or FALSE). There are two statuses associated with alarms: set and
cleared. An alarm is set when the data point is at or exceeds its alarm limit. An alarm is cleared
when the data point is within its alarm limit(s).
The Mark III meter stores an alarm log record whenever any monitored data point’s alarm status
(cleared or set) changes. The alarm log record indicates the data point, date and time, alarm
status, corresponding alarm limit, and data point value.
The meter can store up to 3000 alarm records. The user can select whether old, unread records
can be overwritten by new records when the log becomes full via the data point
DoOverwriteUnreadAlarmLog. This point can be modified using the Daniel MeterLink Tools -
Edit/Compare Configuration screen. The default is to overwrite old, unread records. Refer to
Section 6.6.6 for information on reading records and marking records as read. The data point
IsAlarmLogFull indicates whether or not the alarm log is full and cannot overwrite old, unread
records.
The user-settable data points AlarmTurnOffHysterisisCount and AlarmTurnOffHysterisis-
TimeSpan are used to prevent very repetitive alarms from filling up the alarm log. When an
alarm is set AlarmTurnOffHysterisisCount times within AlarmTurnOffHysteresisTimeSpan
seconds, then the alarm is suppressed until the alarm frequency drops below the specified rate
(counts per time span) at which point the next alarm clearing “unsuppresses” the alarm. The
alarm log records indicate when an alarm suppression is started and ended. The default values
are 8 occurrences in 240 seconds.
The data points monitored for the alarm log are as shown in Tab le 6- 21 and Tab le 6- 22 below.
Note that the alarm limits are themselves data points. The user-settable alarm limits are listed
by data point name. Non-settable alarm limits are listed by data point value.
Table 6-21 Alarm log non-boolean data points monitored
Data Point Low Alarm Limit High Alarm Limit
GainAUp, GainADn,
GainBUp, GainBDn,
GainCUp, GainCDn,
GainDUp, GainDDn
GainLowLmt
GainHighLmt
AvgSndVel
AvgSoundVelLoLmt
AvgSoundVelHiLmt
AGA8BaseCalcStatus
1
AGA8FlowCalcStatus
1
SpecFlowPressure LowPressureAlarm HighPressureAlarm
SpecFlowTemperature LowTemperatureAlarm HighTemperatureAlarm
LiveFlowPressure LowPressureAlarm HighPressureAlarm
LiveFlowTemperature LowTemperatureAlarm HighTemperatureAlarm