AB Quality 1414-ITT02SBRAA Installation Instructions Manual - Page 3

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Space Temperature Transmitter
3

About Space Temperature Transmitter

The unit is designed to convert a 1000 ohm RTD signal and provide a 4 to 20 mA
analog output with ±0.15°C Class A, ±0.30°C Class B and 0.1% FSO accuracy for the
board.
Designed for temperature measurement of occupied spaces. Featuring several
enclosure styles to accommodate various job requirements.

Install Space Temperature Transmitter

Transmitters are mounted directly on a wall or to a wall box. For the most accurate
results, units should be mounted on an inside wall to a wall box, approximately 3
to 5 feet from the floor, away from any supply air exhausts and other sources of
heat or cold. The enclosure cover is held in place with a locking tab located to the
left of center at the bottom of the enclosure. Remove the setpoint knob before
removing the cover. Use a set screw (1/16" or 1.5 mm) to lock the cover at the
bottom of the enclosure after installation.
Wire and Connect Space Temperature Transmitter
Connect the transmitter to the controller using 18 to 22 AWG twisted pair wiring.
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 same conduit 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.
Options, if included on your unit, are wired at the Setpoint and Override terminals.
The Return terminal is used as the common for both of these options. The LCD
display is powered by the same supply as the transmitter.
Wire to a Programmable Controller
This section indicates typical wiring connections to a programmable controller.
When you use this connection scheme, the nominal setpoint is wired to a 0 to 20
mA analog input. The setpoint current signal is reverse acting with respect to the
position of the setpoint slider. The setpoint current varies from 1.2 mA at the
minimum position to 0.8 mA at the maximum position. An analog input with 14-bit
resolution provides a resolution of 0.06°F over a range of 60 to 80°F. Analog
Publication 1414-IN012A-EN-P - October 2005