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47DT OPERATING MANUAL EM-9508-B Rev.7
1.7.4 WIRING INPUT SIGNAL
Connect a thermocouple or extension wires.
IMPORTANT
• Be sure to confirm the polarity of the thermocouple and compensation leadwires in wiring.
• Wire the unit with the thermocouple using the extension wires with the same characteristics as the thermocouple.
• Be careful not to change the temperature around the terminal block. Take care that wind from a fan does not hit it
directly.
• Attach the CJC sensor regardless of setting for cold junction compensation. If the CJC sensor is removed out of neces-
sity, be sure to short between the terminal 2 and 3.
• Take measures to reduce noise as much as possible, e.g. by using shielded twisted pair wires for the input signal.
Ground the input shield to the most stable earth to prevent noise troubles.
• Do not connect anything to unused terminals.
Thermocouple input
T/C
Ground
(resistance
100 ohms or less)
CJC sensor (model: CJM)
Extension
Wire
+
–
1
2
3
+
–
NOTE
■
HOW TO SCREW COLD JUNCTION COMPENSATION (CJC) SENSOR
• Mount the CJC sensor to the terminals 2 and 3 as shown in the following figure.
CJC sensor
• Screw the CJC sensor together with the compensation leadwire to the terminal 2.
• Confirm the front/rear of the CJC sensor.
Rear side of CJC sensor
Temperature sensor
A temperature sensor is on the rear
side of the CJC sensor. Screw the
CJC sensor to the terminal 2 with the
temperature sensor facing downward.
Wrong installation may destroy the
temperature sensor.