Siemens SITRANS F C MASSFLO, Operating Instruction, Page: 15 / 36

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SFIDK.PS.028.S2.02
4.7 Process pipe connection
The process pipes can be mounted directly onto the process connections on the sensor. To
obtain a proper scaling, use a wrench on the base of the process connections as counter lock
to secure with the optimum torque.
4.8 Pressure guard
When working with operating pressures/media which may cause pipe fractures and possible
injuries to people, equipment, or anything else, we recommend that special precautions are
taken when building in the sensor. Use special placement, shielding, pressure guard, or similar
precautions.
The sensor enclosure is supplied with a 1/8" nipple. In liquid applications a pressure guard can
be connected to automatically shut off the flow to the sensor in case of a leakage. For mounting
instructions, refer to section
„Mounting of pressure guard“. In gas applications a thorough safety
evaluation must be made.
Mounting of pressure guard
Before removing the nipple from the sensor enclosure, please note the following:
Penetration of humidity, liquids, or particles into the sensor must be avoided as it may influence
the measurement and, in worst case, affect the measuring function. Influence, however, can be
avoided using the following:
1. Place the sensor in a dry, clean place and leave it to acclimatize until it reaches ambient
temperature, preferred 20 °C (68 °F).
2. Carefully disconnect the nipple and mount the pressure guard. Use the enclosed spare
sealing ring for proper sealing.
3. Check that the pressure guard has been correctly mounted and thoroughly tightened so
that the sealing ring fits tightly. After each dismantling, the sealing ring must always be
replaced by a new one.