Table 6 Status LEDs
Color Meaning
Green DGA monitor operates normally and performs measurement cycles.
Green (flashing) DGA monitor is in standby mode, or running a service tool. Requires user
interaction to begin measurement.
Yellow DGA monitor requires user interaction. For example, a device warning is
active, a service tool requires user input, or the DGA monitor is being
initialized or uninstalled.
Yellow (flashing) Gas level alert is active, caution limit exceeded.
Red Device error is active. User interaction is required.
Red (flashing) Gas level alert is active, alarm limit exceeded.
2.11 Gas level alerts
DGA monitor has a comprehensive selection of individual gas level alerts:
• 4 possible alerts for each measured gas and the total dissolved combustible gases
(TDCG) parameter: latest measured value, ROC 1 day, ROC 7 days, and ROC 30 days.
• Total gas pressure (TGP) and moisture alerts (ppm and %RS) can be configured for the
latest measured value.
Each alert has two separate limits, caution and alarm. The limits are maximum limits, and the
alert is activated when the gas level is above the limit. As an exception, the TGP alert limits can
also be defined as a minimum limit, which activates the alert when total gas pressure is below
the limit value.
Active gas level alerts are seen in the user interface, status LEDs, and output protocols. They
also control relay activation.
In addition to alert limits, DGA monitor implements additional rules to prevent unnecessary
alerts:
• Only reliable measurement results can activate alerts. If the DGA monitor has been in the
standby state, it must complete 3 measurement cycles before alarms can be activated.
• Alerts will not be activated during the initial autocalibration after installation.
• A single large jump in the measured value that exceeds the alert limit will not activate an
alert. The previous measurement must be at least 75% of the latest measurement to
activate an alert. If the measured value remains over the limit when the next measurement
cycle is completed, the alert is activated.
Alerts are deactivated as follows:
• Alerts for gas concentration values are deactivated after 20 consecutive results have been
below the alert limit.
• Alerts for rate of change (ROC) values are deactivated after the latest result is below 90%
of the alert limit.
Gas level alerts can also be temporarily muted by the Admin user.
OPT100 User Guide M211858EN-U
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