MR MESSKO MSAFE, Operating Instructions Manual

Page: 37 / 60

6 Commissioning
37 7232312/00 EN
2. Press the test button down and release.
ð
The upper and lower float gauges are pressed down and the dry-reed
magnetic switches of both float gauges issue a signal.
ð The upper float gauge returns to its starting position. The upper float
gauge signal stops. Check the position of the float gauge via the in-
spection window.
ð
The lower float gauge is blocked by the flap valve. The lower float
gauge continues issuing a signal until the flap valve is released manu-
ally.
3. Turn the test button counterclockwise to the stop.
ð The flap valve is released and returns to its starting position.
ð
The lower float gauge returns to its starting position. The lower float
gauge signal stops. Check the position of the float gauge via the in-
spection window.
4. Fasten the cover sleeve onto the test button (open-end wrench, wrench
size 24, torque 5 Nm).
ð
The test is complete.
6.3.2 Gas accumulation in the insulating fluid
This test simulates the accumulation of gas in the upper part of the Buchholz
relay.
ü The Buchholz relay is equipped with the connection for pneumatics test-
ing.
ü The pipes are filled with insulating fluid.
1. Unscrew the locking cap from the connection for pneumatics testing
(open-end wrench, wrench size 14).
2. Connect the air pump (available as an option) to the connection for pneu-
matics testing.
3. Introduce air into the Buchholz relay until the upper float gauge lowers
and the dry-reed magnetic switch issues a signal.
4. Release the air via the gas extraction valve.
ð The upper float gauge returns to its starting position. Check the posi-
tion of the float gauge via the inspection window.