Cygnus 3 - Changing the Probe Membrane

Cygnus 3 Operating Manual
M4-CYG3-M-ENG_Iss2.doc
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Changing the Membrane
1.
Unscrew the Knurled Ring from
the end of the Probe
2.
Use the Locking Ring Key to
unscrew the Locking Ring from
inside the Knurled Ring. The old
membrane can then be removed
and discarded.
3.
Place a new membrane into the
end of the Knurled Ring ensuring
it locates in the groove.
4.
Screw the Locking Ring back
inside the Knurled Ring and
tighten with the Locking Ring
Key.
5.
Place a few drops of Membrane
Couplant on to the probe face.
6.
Screw the Knurled Ring back
onto the probe. Use your thumb
to squeeze the couplant from
under the membrane as you
tighten the Knurled Ring down
7.
The membrane should have a
very thin film of couplant
between itself and the probe
face with no air bubbles.