40 Installation Guide
Configuring alarm levels
For hydrogen and moisture, the sensor supports two user-configurable alarm thresholds for level and
two more for rate-of-change (RoC). See Table 7 for default factory settings.
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Table 7 Default warning and alarm threshold settings
Alarm thresholds Warning value Alarm value
Hydrogen level 100 ppm 250 ppm
Hydrogen 24h rate-of-charge (RoC) +10 ppm +25 ppm
Hydrogen RoC trigger level 80 ppm
Moisture level 20 ppm 30 ppm
Moisture 24h rate-of-charge (RoC) +5 ppm +10 ppm
Moisture RoC trigger level 15 ppm
It is your responsibility to define warning and alarm thresholds suited to the condition and application
of your transformer. ABB Transformer Service will be glad to help.
NOTICE
Default warning and alarm level values can be modified using the web interface.
Rate-of-Change (RoC) trigger level
To avoid false alarms, a minimum level is configured for the rate-of-change alarm to be considered. Only
when the hydrogen level is above the hydrogen RoC trigger level will a rate-of-change warning or alarm
condition be raised.
Similarly, only when the moisture level is above the moisture RoC trigger level can a rate-of-change
warning or alarm condition be raised.
Latched alarms
Warnings and alarms raised by the CoreSense are “latching”, meaning that even if the level goes back
under the warning or alarm threshold, the warning or alarm will stay on until it is acknowledged in the
event log using the web interface.
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