Rockwell Automation 1414-ITExxxxx_CTExxxxx Strap-on Temperature Transmitter - Manual (Page 3)

Strap-on Temperature Transmitter 3
Publication 1414-IN013A-EN-P - October 2005
Install the Strap-on Temperature Probe
Mount the probe under any pipe insulation in direct contact with the pipe to
measure the temperature of the pipe using metal pipe straps or cable ties. For best
results, thermal compound should be used between the probe and pipe to improve
heat transfer and the installation should be wrapped with insulation to reduce the
effects of ambient air.
Wire/Connect the Strap-on Temperature Transmitter
Connect the transmitter to the controller using twisted 18 to 22 AWG wire. The
transmitter requires two wires for DC 4 to 20 mA loop-powered operation. The use
of shielded cable is optional but recommended for the highest noise immunity. Do
not route signal wires in the sam econduit with power cables as signal degradation
may occur. The controller Analog Input (AI) must be selected to match the
transmitter output before power is applied. The AI type must be a current input
with 250 or 500 ohm impedance. All transmitters have an operating range of 0 to
70°C (32 to 158°F). The transmitter board should not be mounted where
temperatures exceed these values. See the connection diagram for more details.
Typical wiring to a controller is shown in the connection diagram.
For 4 to 20 mA loop signal, only the PWR and OUT terminals are used.
Field Calibration
The unit can be calibrated in the field by using precision resistor values equal to the
zero and span of the transmitter temperature range.
1. Disconnect the sensor from the transmitter and connect the resistor that
represents the zero value to the EXC and NEG terminals.
NEG
EXC
SEN
PW
R
CO
M
OU
T
SPAN
ZERO
+ 24 VDC -
ANL IN 0 +
ANL IN 0 -
Analog Current Input
ANL COM
Loop power supply
2-wire RTD
Sensor
Temperature Transmitter