TROUBLESHOOTING
REV6 /REV2 OI 248 (EN) 63
8.3 Replacing the Density Monitor
The density monitor (1) is connected to the filler block (3) by the
threaded bushing (2). The O-ring (4) seals the connection.
The internal thread (female thread) of the threaded bushing is a
right-hand thread, whereas the external thread (male thread) is a
left-hand thread.
If no density monitor is attached, the check valve (5) closes the ho-
le in the filler block. This makes it possible to replace the density
monitor without disconnecting the gas couplings from the pole co-
lumns.
• Hold the density monitor firmly and unscrew and remove the
threaded bushing from the filler block (left-hand thread).
Because of the left-hand and right-hand thread combination, the
density monitor will move out of the threaded bushing
simultaneously.
• Remove the threaded bushing (2) from the old density monitor.
• Replace the O-ring (4). Lubricate the O-ring and sealing surfaces
as per L5.
• Lubricate both threads of the threaded bushing as per L4.
• Screw the threaded bushing two full turns onto the new density
monitor.
• Place the threaded bushing and density monitor on the filler
block. Align the density monitor and screw the threaded bushing
into the filler block (left-hand thread). Because of the left-hand
and right-hand thread combination, the density monitor will move
into the threaded bushing simultaneously.
• Tighten the threaded bushing to a torque of 30Nm.
• After installation, there must be a gap (2 to 4mm) between the
collar of the threaded bushing and the filler block. The gap
ensures that the density monitor will rest securely on the filler
block.
• Fill the vent hole (2a) in the threaded bushing with grease as per
L4.
In one equipment version, the switchgear is available with a den-
sity monitor unit of type EasyCheck.
The EasyCheck technology makes it particularly easy to perform
the emission-free density monitor test in correspondence with
the "F-gases regulation EU 517/2014" quickly and safely. (see
Chapter “12.1” on page 97)
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