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PRESYS
| Instruments
2.3.2 - RTD Connection
A RTD accepts a 2-, 3-, or 4-wire connection. All connection types are shown in
figure 5.
In the event of a 2-wire RTD, connect the RTD between I/O terminals 1 and 3 to
use input 1 or to terminals 4 and 6 to use input 2 as illustrated in figure 5.
For a 3-wire RTD, connect the RTD in the same way as for the previously
described 2-wire connection, except that a third wire for RTD compensation should be
connected to terminal 2 in the case of input 1 and to terminal 5 in the case of input 2, see
figure 5.
A 4-wire RTD should be connected to the controllers in the same manner as for a
3-wire connection, except that the fourth RTD wire is disregarded and left disconnected,
see figure 5.
The use of a 3-wire RTD provides a higher accuracy than a 2-wire connection.
The RTD wiring should be of the same material, length and gauge to ensure
proper resistance compensation on all terminal connections. The maximum connecting
wire resistance is 10Ω per wire. The minimum wire gauge should be 18AWG for
distances of up to 50 meters and 16 AWG for distances in excess of 50m.
RTD
Note 1
6 5
4
3
Channel 2
Channel 1
2-WIRE
RTD
Note 1
6 5
4
3
Channel 2
2-WIRE
Note 1: Let the shield wire disconnected at this end.
GROUNDED
Note 1
2
1
6 5
Channel 2
UNGROUNDED
Note 1
2
1
6 5
Channel 1
Channel 2
Fig. 5 - RTD Connection
RTD
Note 1
4
3
2
1
Channel 1
3-WIRE
RTD
Note 1
4
3
2
1
Channel 1
3-WIRE
DCY-2050 and DCY-2051
RTD
NC
NC
Note 1
6 5
4
3
2
1
Channel 2
Channel 1
4-WIRE
RTD
NC
NC
Note 1
6 5
4
3
2
1
Channel 2
Channel 1
4-WIRE
Installation
Page 10
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