MA-037 - CB Watch 3 Operating Manual
v7.0 - May 2020
Page 57 of 118
Setting Alarms
Notice: It is the customer’s responsibility to decide whether to set alarms or not and
to
decide what thresholds to set alarms at, as this will depend on the customer’s operational
priorities and risk philosophy. However, here are some guidelines that may prove helpful in
deciding what threshold values to use:
Alarm Summary
This table summarises all the alarms that can be set in terms of SF6 gas monitoring.
Required data
The data required to set alarm thresholds is readily available from the CB operating manual
or from the CB’s name plate
:
Figure 85
–
Name plate data
Min Alarm Max Alarm
Digital
Relay
Gas pressure at 20°C
Yes, 2x
Yes
Yes
Yes
Gas liquefaction risk
Yes
No
Yes
Yes
Gas moisture level
No
Yes
Yes
Yes
Gas short-term extrapolated pressure at 20°C
Yes
No
Yes
Yes
Gas long-term extrapolated pressure at 20°C
Yes
No
Yes
Yes
Long term gas % leak rate
No
Yes, 2x
Yes
Yes
Data obtained from CBW3
Thresholds
Alarms available
