80-5212-322 Datasheet, PDF (6/28 Pages) Magnetrol International, Inc. – RF Point Level Switches

Figure 1
Recommended Horizontal Mounting
1" (25 mm) minimum
2.2.2 Tanks/Silos w/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.
NOTE: These comments also apply for glass-lined metal walled
tanks.
Caution: When an insulated probe is used in a hazardous and/or
abrasive medium, the probe should be inspected annually
for any nicks, cuts or abrasions which may ruin the integrity
of the insulation. In the event that wear is found, replace
the probe or consult the factory for further instructions.
This procedure is critical in vessels containing hazardous
media.
Probe Sheath
Figure 2
Recommended Mounting with Nozzle
Probe Sheath
Figure 3
Not Recommended
2.3 Horizontal Mounting
2.3.1 Narrow Differential Single Point Units Only
Horizontally mounted probes provide a high degree of
sensitivity for use with non-conductive liquids as only
approximately 0.625" of level change is required to com-
pletely cover (or uncover) the probe.
Horizontally mounted probe rods should be installed so
that the rod is parallel to and at the level at which control
point is desired. Refer to Figure 1.
Avoid any installation method in which the material may
become trapped in the mounting nozzle, thus preventing
probe from signaling when level recedes. Refer to Figure 2.
NOTE: If nozzle mounting is unavoidable, probe must be installed
with an inactive metal sheath having a length at least 1 inch
(25 mm) greater than length of nozzle. Sheath is required to
render length of probe within nozzle insensitive to capacitance
change. Refer to Figure 3.
On applications involving viscous liquids or materials which
tend to cling or buildup, horizontal mounting probes should be
installed at a slight downward angle to allow material to drain
from probe rod. With this type installation, packing gland face
of probe assembly should extend into the tank (or vessel).
Refer to Figure 4.
Figure 4
Alternate Horizontal Mounting
for Viscous Materials
3
50-605 Kotron RF Point Model 80/81 Level Switches