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7.4 Tape protection
The tape protection tube is a mechanical safety device which
prevents the valve from being closed as long as the sensing
probe is inside the tank. When the sensing probe is lowered
the protection tube will follow the sensing probe by gravity
until the tube is retained by a ring located inside the coupler.
In that position the protection tube prevents closing the
valve. When the tape is wound up the protection tube will
stay in position until it is pushed up by the sensing probe.
Before instrument is used check that the protection tube is
moving freely. For cleaning purposes the protection tube is
slotted.
TAPE PROTECTION TUBE
STORAGE TUBE
SENSOR
RETAINER
QUICK CONNECT
COUPLER
BALL VALVE
VALVE CLOSED
VALVE OPEN
Figure 7-8
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