Maintenance
Control of contact densimeter thresholds
P51--1001EN/03
5/8
07--2012
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GRID
Checking densimeter thresholds, continued
Check
The following table defines the steps for checking the densimeter :
Step Action Remark
1 Connect a test lamp to the
densimeter’s ”Alarm
pressure for isolation”
contact p
ae
.
Connection to the operating
mechanism terminal block,
according to the electric diagram.
2 Calculate the relative
pressure for switchover of
the ”Alarm pressure for
isolation” contact p
ae
,
corrected according to local
atmospheric pressure and
temperature.
Value p
ae
: see technical
characteristics.
See ”Calculating the SF
6
gas
filling pressure for use of the
pressure gauge (tools)”
module.
3 D Create a leak by unscre-
wing
the pressure gauge’s
(20) ”REGULATION” screw
(11), and check the contact
switches over at the
previously calculated value.
D Proceed in the same way
to check the ”Minimum
pressure for isolation”
contact p
me
.
11
20
In a case where one of the
thresholds does not comply with
the specified value, replace the
densimeter.
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