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1.0 General Description
The Model d-RTTI Digital, Room-Temperature, Transmitter-
Indicator is designed to accurately sense and display ambient
room temperature and provide a 4 to 20 mA output signal that is
proportional to the measured temperature to within ±0 1 ºF
The d-RTTI displays ambient room temperature across an
operating range of -40ºF to 180ºF or -40ºC to 82ºC The standard
factory configuration scales the 4 to 20 mA output signal to
represent a temperature span of 0 to 100ºF The user can easily
reconfigure the unit in the field by using the three push button
switches located on the backside of the device
A precision 1000 ohm RTD sensor is used to detect the ambient
temperature An option is also available that will accept its input
from an external 1000 ohm platinum RTD sensor
The d-RTTI operates on a supply voltage of 10 to 28 Volts DC
This is a true two wire device with signal and power being
provided over a single pair of wires
2.0 Physical Description
The d-RTTI enclosure consists of a beige 4 7” high by 2 8” wide by
3/8” thick plastic plate Captivated mounting screws and a gasket
seal are provided to attach the unit to a single-gang electrical
outlet box The sealed front faceplate provides a measure of
splash resistance for applications where wash down is required
The internal RTD temperature sensor is mounted on the backside
of the black anodized aluminum heatsink that protrudes from the
front of the unit The heatsink ensures temperature compliance
with the ambient environment The temperature is indicated on a
seven-segment, 0 4-inch high, red LED display, with a
temperature resolution of one tenth of a degree The three buttons
labeled FUNC, INCR, and NEXT are located on the backside of
the d-RTTI and allow the user to set the operating parameters
Compression screw-terminals on the rear provide connection
points for the 4 to 20mA output wires and the optional remote
sensor Refer to figures 1 and 2.
