User`s manual

Install and Wire, Chapter 2

WATLOW Series 965 User's Manual

RTD, 2- or 3-wire

Input Wiring

DIP Switch

Orientation

4 - 20mA Process Input

DIP Switch

Orientation

Figure 11 -

4-20mA Process

Sensor Input Wiring

Figure 10 -

2- or 3-wire RTD

Sensor Input Wiring

Input impedance: 5

Ω

There could be a + 2°F input error for every 1Ω of lead length resistance when

using a 2-wire RTD. That resistance, when added to the RTD element resis-

tance, will result in erroneous input to the instrument. To overcome this prob-

lem, use a 3-wire RTD sensor, which compensates for lead length resistance.

When extension wire is used for a 3-wire RTD, all wires must have the same

electrical resistance (i.e. same gauge, copper stranded, same length).

CAUTION:

Process input does

not have sensor

break protection.

Outputs can remain

full on.

3-wire RTD

2-wire RTD

Jumper

Terminals

3 and 5.