8
S&C Instruction Sheet 712-501
Understanding the
Gas-Pressure Gauge
A temperature-compensated gas-pressure gauge
is located on the underside of each interrupter .
It shows whether SF
6
gas density is sufficient
for a trip operation . The gas-pres sure gauge
shows three zones:
OK TO OPERATE:
This is the white zone . If the gauge needle is in
this zone, the pole-unit is at normal gas density
and can be opened and closed . See Figure 5 .
OK TO OPERATE (BUT REPLACE):
This is the yellow zone . If the gauge needle is
in this zone, the interrupter can be opened and
closed with full ratings . However, the inter-
rupter has lost gas and should be replaced as
soon as possible . See Figure 6 .
“OK TO OPERATE
(BUT REPLACE)” zone
Figure 5. Gauge needle in white “OK TO OPERATE” zone.
Figure 6. Gauge needle in yellow “OK TO OPERATE (BUT REPLACE)”
zone.
“OK TO OPERATE” zone
Indicators
Summary of Contents for Mark VI
Page 28: ...Printed in U S A ...
