SOR RF Continuous Level Transmitter - Manual (Page 3)

Form 837 (05.13) ©SOR Inc. 3/16
This product must be installed with an explosion proof breather vent per
agency requirements and the Nationsl Electric Code - Article 501, Section F,
paragraph 3.
Use 18 - 22 AWG shielded twisted pair wire to make all signal and power connections.
Ensure that wiring conforms to all applicable local and national electrical codes and install
unit(s) according to relevant national and local safety codes.
Current Meter or Resistive
Load (optional)
-
Terminal
+
Terminal
TB1 Loop Power
Terminal Block
DC Power
Supply
-
+
Control
Board
- +

Make sure the power source is
turned off.

Remove the housing cover.

Pull power and signal wire through
the conduit connection and into
the control housing.

Locate TB1 on the control board.
(See ) Terminals are labeled
“+” and “-”. Connect power leads
to the proper terminals.

Do not exceed the maximum loop resistance for the circuit. (See )
Use the following formula to determine the maximum loop resistance of your circuit:
R (ohms) = (input voltage - 12) ÷ 20.0 mA
2200
2100
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
Power Supply Voltage (Volts)
0 10 15 20 25 30 35 40 45 55
Maximum Loop Resistance (Ohms)
Loop Resistance vs. Power Supply Voltage
600 Ohms
at 24 VDC
1 Ohm
at 12 VDC
2150 Ohms
at 55 VDC
900 Ohms
at 30 VDC
1400 Ohms
at 40 VDC
NOTE: Refer to the
individual device
specifi cations of
user-supplied
equipment to
determine the
resistive load
(in ohms) and the
power requirements.