16
► Screw the rod to the unit again and tighten it� Recommended tightening torque:
4 Nm�
► Precisely measure the probe length L, note the value� It must be entered during
parameter setting of the unit (→ 10.2).
6.4 Installation of the unit
For correct function the unit needs a large enough metal launching plate� It
is necessary for transferring the microwave pulse to the tank with optimum
transmission power� The flange plates that are available as accessories are
not sufficient as launching plates�
For installation in closed metal tanks, the tank lid serves as a launching plate (R in
fig� 6-5 and 6-9)� 2 ways of installation are possible:
• Screw in a ¾" NPT process connection in the tank lid (→ 6.4.1).
• Installation in the tank lid using a flange plate, e.g. for tanks with thin walls (→
6�4�2)�
Furthermore, installation in open tanks (→ 6.4.3) and plastic tanks is possible (→
6�4�4)�
6.4.1 Installation in closed metal tanks (without flange plage)
fig. 6-5
fig. 6-6
32
R
► The lower edge of the process connection should be flush with the installation
environment (fig� 6-5)�
► Avoid non-flush installation (fig� 6-6)� The height can be slightly corrected by
means of appropriate sealing material (e�g� Teflon tape)�
► In the case of thick walls arrange for sufficiently deep recesses to ensure flush
installation�