50-660 Kotron
®
Model 805 Smart RF Level Transmitter
10
2.4
Mounting
The Model 805 transmitter can be mounted to a tank
using a variety of process connections. Generally, either a
threaded or flanged connection is used. For information
about the sizes and types of connections available, see
Brochure 50-125, KOTRON
®
RF Sensing Probes
.
Make sure all mounting connections are properly in place
on the tank before installing the probe. Make sure the
KOTRON probe is correct for the intended installation.
It is common practice to use the metal tank wall as the ref-
erence electrode. In such cases, it is required that the probe
housing makes a good electrical connection to the tank
wall. If there is any doubt about this connection or to the
use of PTFE thread tape gaskets, paint, rust, or any other
reason, a separate strap should be installed between the
probe housing and the tank.
Caution:
This unit contains CMOS electronics which may be dam-
aged by static electricity. Do not touch any semi-conduc-
tor devices unless you are properly grounded.
Metal Walled Tanks
On water-based liquids, there should be no problem with
sensitivity or linearity. With non-conductive, low dielectric
media, sensitivity can be enhanced by locating the probe
close to and parallel with the tank wall. If this is not prac-
tical, a concentric ground tube surrounding the probe
(sometimes called a stilling well), may be the solution.
NOTE: These comments are also true for glass-lined metal
walled tanks.
Tanks/Silos with Non-Conductive Materials of
Construction
With plastic, concrete, wood, or any other non-conductive
walled vessels, the reference electrode mentioned above
needs clarification. Most commonly, this electrode will be
in the form of a concentric ground tube (i.e. stilling well).
In questionable circumstances, consult the factory. In all
cases, a good electrical connection must be made between
the ground surface and the probe housing.
