DAB
page 4 DAB K02/0422
5. Operating Principle
Flow-through sight glasses with sight glass cylinders and flanges are designed for
monitoring fluid in pipelines. It also can be equipped with a swimming ball, e.g.
made of polypropylene (PP).
6. Mechanical Connection
Before installation:
• Remove all transport protections and make sure that there are no
packaging parts in the device.
• Handling flow-through sight glasses with sight glass cylinders and flanges
requires special care.
• Make sure that the permitted max. operating pressures and operating
temperatures of the device must not be exceeded (see technical data).
• The materials of the flow-through sight glasses and flanges must
be compatible with the media in contact with them.
• Install the flowmeter in the pipeline without tension.
• Protect the measuring tube from damage from the outside.
• Avoid pressure surges in the measuring tube e.g. by quickly shutting off the
flow.
• After the mechanical installation it should already be checked, whether the
connection fitting / pipe is tight (see chapter Commissioning), if possible.
• If fire occurs, sealing is not guaranteed.
The installation must be carried out in a pressureless state. Dangerous liquids,
gases or vapors should be drained. The installation should be tension-free. The
pressure and temperature limits must be observed.
When installing in pipelines, please note:
1. Connections must be parallel to each other, so that a distortion of the housing
is avoided.
2. Before installation, the pipes must be thoroughly cleaned
3. Rinse and dry the instrument
During commissioning, pay attention to leaks and eliminate the leaks by
retightening the fastening elements. The system should be tested with a maximum
of 1.1 times the nominal pressure.
