User manual

2110 Temperature Controller
Chromalox 2110
Three-Wire RTD Inputs
IMPORTANT: When making the three-wire RTD input connection,
make the resistance of all three extension leadwires equal by us-
ing the same gauge and same length of wire for optimum accu-
racy. A three-wire RTD will generally have two wires of the same
color. Connect the same colored wires to the RTDL connections.
Connect the alternate colored wire to the RTDH connection.
Make three-wire RTD connections to terminals as shown in Figure 3.7.
Two-Wire RTD Inputs
If using a two-wire RTD input, use heavier gauge leadwires to
reduce leadwire resistance. Any leadwire resistance adds directly
to sensor resistance, thus adding error to the process tempera-
ture measurement. It is also necessary to jumper the two RTDL
terminals on the instrument to complete a two-wire hookup.
9
Section 3–Installation and Wiring
Sensor Input Wiring
continued
Figure 3.7
Three-Wire RTD Connections with Shield
RTDL
RTDH
RTDL
NC
NO
COM
Shield Ground
Figure 3.8
Two-Wire RTD Connections
NC
NO
COM
RTDL
RTDH
RTDL