SOR 510IM Immersible Transmitter - Manual (Page 3)

Form 1003 (03.13) ©SOR Inc. 3/4
Wiring Details
Ensure that wiring conforms to all applicable local and national electrical codes and install
unit(s) according to relevant national and local safety codes.
The 510IM transmitter is designed to operate in a 2-wire, 4-20 mA system. A system of this
type requires that the measuring instrument alter the current consump tion of an electrical
circuit in proportion to pressure changes. The changes in current may be measured using
suitable instruments. Due to the design of the transmitter, it is unable to produce currents
less than approximately 3.3 mA. Should the transmitter output be “locked” at a figure of
this order, it is indicative of a fault and the system should be checked immediately.
Schematic diagrams for incorporation of the transmitter into a control or display loop are
shown below. The sup ply voltage at the transmitter terminals must be between 10 and
32 Vdc (IS option 28 VDC max). Polarity of the transmitter wiring is essential for proper
operation.
Power
Supply
Red Wire
Blue Wire
White Wire
Transmitter
Millimeter
4 - 20 mA
Case Ground
Power
Supply
Red Wire
Blue Wire
White Wire Transmitter
Case Ground
Resistive
load
To Display or other
Process Instruments
The transmitter will drive into a resistive
load, which is a function of the supply
voltage. This may be derived from the
following formula:
As noted earlier, the minimum current
the transmitter can supply is in the order
of 3.3 mA. If a reading of this nature is
obtained, it is usually indicative of a fault
condi tion, possibly due to damage to the
transmitter caused by over pressurization
or negative pressure being applied to the
transmitter.
R
L
(Max) =
V
Supply
- 10V
The red wire is the positive power supply input, the blue wire is the negative power supply
input and white is case ground. Reverse connection will prevent the transmitter operating
due to its internal reverse polarity protection.