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CN 2110
Omega
8
Section 3–Installation and Wiring
Sensor Input Wiring
Sensor Wiring Notes
For safety and best controller performance,
•
Sensor leads (thermocouple and RTD) should not be run in the same
conduit as power wiring.
•
Twisted pair, shielded wire is recommended for sensor connections.
•
False temperature readings can occur if the sensor wire is exposed
to electrical noise.
•
Ungrounded thermocouples are recommended.
•
Thermocouple extension wire, if required, must be the same type
as the thermocouple (i.e. if a Type K thermocouple is used, then Type
K extension wire must be used.)
• Shielded thermocouple wire, if used, must have the shield
grounded at one end only, preferably at the shield ground terminal on
the controller as shown in Figure 3.6.
•
Three-wire RTDs are recommended for greatest accuracy.
•
Standard shielded copper wire
is recommended for RTD extensions.
Thermocouple Inputs
It is important to observe polarity (+,-) when connecting thermocouple
leadwires. ANSI color coding for the thermocouples used with this
instrument are
Thermocouple
Type Material Polarity (+) Polarity (-)
J iron/constantan white red
K chromel/alumel yellow red
Make thermocouple wiring connections to terminals as shown in Figure
3.6.
Figure 3.6
Thermocouple Connections with Shield
TC -
NC
NO
COM
TC +
Shield Ground