461
Temperature Sensor Units Section 7-5
Note Fahrenheit temperature uses the following equation to convert the tempera-
ture unit from Celsius, but the temperature input range is different between
Fahrenheit and Celsius.
Fahrenheit temperature (°F) = Celsius temperature (°C) x 1.8 + 32
Connecting Temperature
Sensors
Thermocouples
Either K or J thermocouples can be connected, but all four thermocouples
must be the same type and the same input range. Only last two channels can
be used as analog inputs.
Note When connecting a thermocouple input, observe the following precautions:
• Do not remove the cold junction compensator attached at the time of
delivery. If the cold junction compensator is removed, the Unit will not be
able to measure temperatures correctly.
SW Setting
1 Thermocouple type of
temperature sensor
ON J
OFF K
2 Temperature unit ON °F
OFF °C
3NC
4 Input type selection for
the third input (Input 2)
ON Analog input
OFF Thermocouple
5 Input type selection for
the fourth input (Input 3)
ON Analog input
OFF Thermocouple
6 Analog input signal
range
ON 1 to 5V/4 to 20mA
OFF 0 to 10V
Temperature input Analog input
Input type Range (°C) Range (°F) Input type Range
K −200.0 to 1300.0 −300.0 to 2300.0 Voltage 0 to 10V/1 to 5V
J −100.0 to 850.0 −100.0 to 1500.0 Current 4 to 20mA
SW 1 2 3 4 5 6
ON
OFF
Temperature input 0
LOOP0−
LOOP0+
NC
LOOP1−
LOOP1+
NC I IN2
I IN3
Temperature input 1
Temperature input 2
Temperature input 3
LOOP2+
V IN2
LOOP3+
V IN3
LOOP2−
COM2
LOOP3−
COM3
Cold junction
compensator
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