NZJ
page 4
NZJ K03/0522
5. Operating Principle
The Kobold Unirota NZJ model by-pass level indicator works on the basis of the
intercommunicating vessels principle. The NZJ type glass tube level indicator is
applicable for the indication of liquid level in small and middle-sized, standing or
lying round containers used in food, pharmaceutical and chemical industries. The
level of the liquid in the glass tube of the appliance is the same with the level in
the round containers. The level of the liquid can be seen through the sight glass.
The loads occurring at the installation is absorbed by the fixing device, thus the
glass tube is protected against breaking. The fixing device also protects the
glass tube against the mechanical impacts that may occur following the
installation. We recommend that the normal design level indicators be fitted on
vessels containing pure liquids, while the indicators mounted with cleaning
stubs (a low, or low-top stub) be fitted on containers filled with contaminated
liquid.
6. Mechanical Connection
Before installation:
•
Remove all transportation safety locks and ensure that no packing material
remains within the unit.
•
Be sure that the maximum allowable operating pressure and temperature is
not exceeded (see Technical data).
•
Install the by-pass level indicator at the side of the round containers, ensure
the instrument is under no mechanical stress/tension (install support bracing if
necessary).
•
Protect the measuring tube from external damage.
•
Avoid pressure peaks in the measuring tube, e.g. from sudden surges or
stoppage of flow.
•
If possible, immediately after making mechanical connections, check whether
the connections are properly sealed with no evidence of leakage.
•
Make sure that the connections are in plain.
