WIRING INSTRUCTIONS
18
CN4421 (without alarm)
+
–
1
3
4
5
6
7
8
Current output, DC SSR driver output
Contact output
RTD
*Voltage/current
Thermocouple
input
Power supply
(viewing from the back
of instrument)
B
B
A
–
+
–
+
2
~
–
+
CN4421-A (with alarm)
1
2
3
4
5
6
7
8
9
10
11
~
+
–
B
B
A
–
+
Current output, DC SSR driver output
Contact output
*Voltage/
current
Alarm output
Thermocouple
input
Power supply
(viewing from the
back of instrument)
–
+
RTD
–
+
–
+
250
Ω
* For current input, install the 250
Ω
precision
resistor (accessory) before using the unit.
Warning
Be sure to use the rated power supply voltage and polarity.