CB Watch 3 User Manual v6.3 - May 2019 Page 47 of 100
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 user’s manual
or from the CB’s name plate:
Figure 67 – Gas level 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
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