Connecting an External Pt 100
Figure 10. Pt Sensor Connection
24 VDC
CJ+ (0:1)
CJ– (0:1)
REM-11120
+
–
x4
a1
a2
b1
b2
Pt100
•
Each spring-terminal block has a connection for an external Pt 100 cold junction sensor.
•
Connect the external Pt 100 cold junction sensor using the Pt 100 input of spring-terminal
1 or 2.
•
Do not use cabling that exceeds 10 m (30 ft.).
Connection Guidelines
Note
For information about fuse ratings for the REM-11120, refer to the device
.
•
Make sure that devices you connect to the REM-11120 are compatible with the module
specifications.
•
Push the wire into the terminal when using a solid wire or a stranded wire with a ferrule.
•
Open the terminal by pressing a screwdriver into the spring lever when using a stranded
wire without a ferrule.
•
Use encapsulated thermocouples.
•
Always connect the thermocouples using twisted pair equalizing conductors.
•
Use shielded twisted pair equalizing conductors for a cables longer than 10 m (32 ft.).
•
For mV sensors in environments prone to interference or sensor cables longer than 10 m
(32 ft), use shielded twisted connecting cables.
•
For thermocouple sensors, use shielded thermocouple connecting cables.
•
NI recommends using the NI Remote I/O Shield Set for optimal shield connection.
•
For installation in a cabinet, connect the cable shield to functional earth ground
immediately after the cables enter the cabinet.
REM-11120 Getting Started Guide
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© National Instruments
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