M-system M3LU2 Operating Manual page 25

8.4.1.2 Thermocouple input
Connect a thermocouple or extension wires.
Thermocouple input
Extension
T/C Wire
Ground
(resistance
100 ohms or less)
CJC sensor (model: CJM)
• Wire the unit with the thermocouple using the extension wires with
the same characteristics as the thermocouple.
• The CJC sensor is calibrated to a particular unit and not inter-
changeable with another. Match the serial No. of the unit and the
sensor (figure on the right).
• Be careful not to change the temperature around the terminal block.
Take care that wind from a fan does not hit it directly.
• Be careful not to separate the CJC sensor from the terminal block.
Do not loosen the screw on the terminal 6. If you did, connect the
CJC sensor to the terminals 5 and 6.
8.4.1.3 RTD/resistance input
Connect a RTD or a resistance. Connect according to the RTD/resistance wires.
RTD/resistance input
2-wire
RTD or resistance
Ground
(resistance
100 ohms or less)
• The leadwire resistance including internal resistance such like a lightning surge protector and a barrier must be maxi-
mum 20 Ω per wire.
• The excitation is 0.3 mA. Use a RTD with excitation 0.3 mA or more.
3-wire
RTD or resistance
Ground
(resistance
100 ohms or less)
CJC sensor (model: CJM)
4-wire
RTD or resistance
(resistance
100 ohms or less)
M3LU2 OPERATING MANUAL EM-2653-B Rev.0
Serial No.
Ground
25