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Presys Instruments
An RTD input device may be a 2-wire, 3-wire or 4-wire RTD.
A 2-wire RTD is connected, for example, to terminals 1 and 3 when using input
1 as shown in Figure 5.
A 3-wire RTD is connected in the same way as explained for a 2-wire RTD,
adding the connection of the compensation wire to terminal 2 for input 1.
Connect a 4-wire RTD as indicated for a 3-wire RTD and keep its forth wire
disconnected. See figure 5.
With a 3-wire RTD one gets a better precision than with a 2-wire RTD.
Use wires of same material, gauge and length on all 3 terminals of each
channel for compensating resistance. The maximum resistance of each connection
wire must be 10 . Use 18 AWG wire (minimum) for distances up to 50 m and 16
AWG for distances greater than 50 m.
2.3.3 - Milliampere Input
Apply 4 to 20mA current signal to the terminals listed below in table 4 for each
channel:
Installation
Página 10
Channel
1
2
3
4
5
6
11(+) and 12(-)
7
13(+) and 14(-)
8
15(+) and 16(-)
9
17(+) and 18(-)
10
19(+) and 20(-)
11
21(+) and 22(-)
12
23(+) and 24(-)
Table 4 - Current input terminals
Terminals
1(+) and 2(-)
3(+) and 4(-)
5(+) and 6(-)
7(+) and 8(-)
9(+) and 10(-)
DMY - 2015
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