
1/03 UDC 6300 Process Controller Product Manual 227
6.7 Input #5 - Low Level Inputs Set Up Wiring, Continued
Thermocouple inputs
using a precision
resistor
Refer to Figure 6-5 and wire the controller according to the procedure
given in Table 6-6.
Table 6-6 Set Up Wiring Procedure for Thermocouple Inputs Using
a Precision Resistor
Step Action
1
Connect the copper leads to the calibrator.
2
Disconnect the cold junction resistor.
3
Install a 500 Ohm precision resistor across terminal 1(R) and
terminal 3(—). See figure 6-5.
4
Subtract the millivolt value for 77°F (25°C) from the zero and span
value for your range (see Table 6-1 for zero and span values) and
use the adjusted value when calibrating.
Figure 6-5 Wiring Connections for Thermocouple Inputs Using a
Precision Resistor
1
2
3
4
5
6
7
8
9
10
11
12
13
L1
L2/N
22
23
14
15
16
17
18
19
20
21
22067
R
+
-
Precision
Resistor
1
Millivolt
Source
1
ATENTION
The accuracy of the controller is directly affected
by the accuracy of this resistor. At a minimum,
use a 0.1% 25 PPM resistor.
Continued on next page
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