LED 1
LED 2
S1
C1
NC1
NO1
C2
NC2
NO2
S2
RS85
24VDC
120VAC
240VAC
L N
+
-
LED 1
LED 2
S1
C1
NC1
NO1
C2
NC2
NO2
S2
RS85
24VDC
120VAC
240VAC
L N
+
-
8
RS85
VIBR ATING FORK LEVEL SWITCH | OI/RS85-EN REV. K
The Model RS80/RS85 unit may not work properly if:
• there is a conductive bridge between the paddles of the
fork.
• the fork tines are not in vertical position.
• there is a high turbulence level
• probe is located near a material fill line.
• probe is mounted improperly.
The model RS80/RS85 unit may be damaged if:
• temperature in the housing exceeds appropriate limits.
• the process temperature exceeds probe’s operating
limits.
• the electronic module is subjected to excessive vibration
or shock.
• vessel pressure exceeds process operating pressure
rating of probe.
• probe is located near a material fill line.
If any of the above statements apply to your application, do
not install the switch until you contact your local
representative or the ABB factory for further instructions.
Integral and remote units
Integral units
• Install the switch into the vessel coupling and connect
conduit between the switch and the power supply source
as required.
• Be sure the conduit is suitable for the environment in
which the units are to be used.
Remote units
• Install the remote sensor probe into the vessel coupling.
Select a suitable location for the instrument housing that
allows convenient access for calibration and meets
environmental conditions of the unit.
• Connect conduit between the remote sensor housing and
the instrument housing.
• Connect the RG62 type coaxial cable assembly supplied
with the unit from the remote probe to the instrument
input.
• Connect conduit between the switch and the supply.
source as required (figure 17 and 19). Be sure the conduit
is suitable for the environment in which the units are to
be used.
Caution
Be sure that all wiring and conduit conforms to the
requirements of the National Electrical Code and any
enforcing authorities or agencies having jurisdiction over the
installation. Be sure that any special conditions, such as
hazardous area locations, are given full consideration.
• After installation and wiring, it is necessary to set–up the
unit to the particular vessel and material that will be
measured, using the standard calibration procedure.
• The Resonator Vibrating Switch is designed to monitor
levels of liquid products with a viscosity not greater than
1000 cp.
NOTE
A) All field wiring connected to the RS85 switch must
comply with applicable National Electric Code or
applicable guidelines.
B) Do not use the switch on vessels with operating
temperatures above 200 °F without having the high
temperature option (all Teflon insulation).
C) Any conduit or fittings in close proximity to a
magnetically activated switch should be aluminum or
some other non–magnetic material. This is necessary
to avoid interference with the operation of the
magnetically activated reed switches.
D) Unit is designed for installation in an overvoltage
category 1, pollution degree 2, as outlined by section 6
of the IEC 1010 standard.
E) The maximum altitude of operation is 6560 ft
(2000 m).
F) Protective grounding: The level switch is equipped
with grounding screw locations, both internal and
external of the housing.
Figure 17
2 . . .Installation
CAUTION
When making the opening in the vessel, observe all
safety requirements of the area in which the work is
being done. Be especially careful when working with
pressure vessels.
CAUTION
Due to the extremely wide range of control and/or
alarm applications in which the unit may be used, it
is not possible to show all conceivable wiring
diagrams. Consult your representative or factory if
further assistance is needed.
