Understanding The Optional Remote Gas-Density Indicator - S&C Mark VI Instructions For Installation Manual

INDICATORS
Understanding the Optional
Remote Gas-Density Indicator
If furnished, the remote gas-density indicator
provides contacts for each interrupter that allow
remote monitoring of two low-gas-pressure
alarms:
Level 1 Alarm:
When a Level 1 Alarm is issued, the interrupter
can be opened and closed as usual. However, the
interrupter has lost gas and should be replaced
as soon as possible.
The remote gas-density Level 1 alarm contact
opens at 93% of normal density, or 70 PSIG at
68°F (20°C). Contacts are normally closed at
normal operating gas pressure.
Level 2 Alarm:
When a Level 2 Alarm is issued, the gas density
in the interrupter has dropped below the
minimum functional level. The interrupter
will not maintain full interrupting or dielectric
ratings. The interrupter should be removed
from service and replaced promptly. DO NOT
operate this Mark VI Circuit-Switcher.
The remote gas-density Level 2 alarm contact
opens at 88% of normal density, or 65 PSIG at 68°
(20°C). Contacts are normally closed at normal
operating gas pressure.
NOTICE
At temperatures below -31°F (-35°C), a
Level 2 Alarm may be issued due to the cold
temperature. At such low temperatures, gas
density is below the interrupter's minimum
functional level, so the interrupter will not
have full interrupting or dielectric ratings.
At these temperatures, a Level 2 Alarm
does not accurately indicate whether an
interrupter is losing SF
712-502
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