20
6.4.4 Installation in plastic tanks
150 mm
R
To enable sufficient transfer of the measured signal, note in case of installation in
plastic tanks or metal tanks with plastic lid:
►
The plastic lid must be provided with a drill hole with a minimum diameter of
150 mm�
►
For installation of the unit, a metal flange plate (= launching plate R) must be
used which sufficiently covers the drill hole�
►
Ensure the minimum distance (= 80 mm) between rod and tank wall, higher for
probe lengths > 700 mm and in case of heavy soiling (→ 6.1.1).
When installed in plastic tanks, there may be deterioration caused by
electromagnetic interference� Corrective measures:
• Apply a metal foil to the outside of the tank�
• Apply a shielding screen between the level sensor and other electronic
units�
• Operation with coaxial probe efficiently protects the unit from
electromagnetic interference� Please note the restrictions regarding the
application area (→ 4.3).
6.5 Installation of the unit with coaxial probe in the tank
►
Seal the process connection:
-For pipes with G¾ process connection: slide the supplied seal onto the thread
of the coaxial pipe�
-For pipes with ¾" NPT process connection: apply a suitable sealing material
(e�g� Teflon tape)�
►
Screw the unit with the coaxial pipe into the tank and tighten it�
