SOR Multi Point RF Level Switch - Manual (Page 3)

Form 677 (05.13) ©SOR Inc. 3/36
Set up
Review Probe set up overview and considerations on page 6 to determine the best ap-
proach to set up. Two set up methods are possible. Actual Level set up begins in the right
column on page 8. Calculated Level set up begins in the left column on page 9.
Review both methods. Actual Level set up is preferred, but may not be practical for all
installations.
Probe Installation
All models
Probes are mounted vertically from the top of a vessel. The probe must be electrically
isolated from the vessel; make no connection between the probe and the vessel other than
the process connection and (if applicable) the threaded weight at the probe tip. Do not weld
any part of this instrument.
Make sure that the sensor can be fully inserted and tightened without interference from
obstructions inside the tank or vessel. (See
) The probe should be mounted away from
inlet fill paths. Spray from a fill path can cause false level indications.
 Insert coated probes carefully to prevent damage to the probe coating.
 For pressurized vessels, seal the flanged or threaded process connection to prevent leakage.
 Do not use the sensor base as a handle to tighten a threaded process connection.
 Use a suitable wrench on the flats to tighten a threaded probe into the process connection.
 Use suitable mounting bolts to mount a flanged probe on a flanged process connection.
Installation of Separate Electronics Housing
Explosion Proof Electronics Housing (Model 66
R)
The explosion proof electronics housing can be line mounted. Alternatives to line mounting
are surface mounting or pipe mounting if appropriate accessory hardware was specified.
Weathertight Electronics Housing (Model 66
W)
The weathertight electronics housing can be surface mounted using #10 or M6 bolts
through the mounting pads. Recommended mounting orientation is horizontal with cover
hinges at 12 o’clock. Allow headroom for cover swing.
Remote Cable Connection
Models 66
R, 66W
Install conduit between the remote probe housing and the separate electronics housing.
In order to maintain explosion proof ratings in hazardous areas, the conduit system must
meet or exceed any explosion proof requirements for the location.
Fish 22/2 shielded twisted pair signal cable through the conduit between the housings.
The terminal block on the set point adjustment board (in the electronics housing) must be
connected to the terminal block on the probe adjustment board (in the remote probe
housing). (See
)