Laurel Electronics LTE: Ethernet & 4-20 mA Output RTD Transmitter for Pt100, Cu10 and Ni120 RTD Input User Manual


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ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • 1



Ethernet & 4-20 mA Output RTD Transmitter

for Pt100, Cu10 and Ni120 RTD Input

Standard Features

Ethernet Serial Data I/O, Modbus TCP or Laurel ASCII protocol

4-20 mA or 0-10V transmitter output, 16 bits, jumper selectable, isolated

Dual 120 mA solid state relays for alarm or control, isolated

Factory calibrated for 100Ω platinum, 10Ω copper and 120Ω nickel RTDs

2, 3 or 4-wire RTD connection for lead resistance compensation

User selectable input span from entire RTD range down to 15.0°

Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span

Fast update rate to 50 or 60 per second

Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power

DIN rail mount housing only 22.5 mm wide, detachable screw-clamp connectors

Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply


The Laureate RTD temperature transmitter provides a linear-
ized, highly accurate, stable and repeatable transmitter output for
100 ohm platinum, 10 ohm copper and 120 ohm nickel RTDs.
Pt 100 platinum RTDs can have a DIN alpha of 0.00385 or ANSI
alpha of 0.00392. The RTD type and temperature range, speci-
fied in °C or °F, are user-selectable. The temperature range can
be as wide as the entire span of the RTD type or as narrow as
150 counts (such as 15.0°), limited only by considerations of
electrical noise and digital filtering time constants.

Digital calibration of all RTD ranges is performed the factory,
with calibration data stored in EEPROM on the signal conditioner
board. This allows signal conditioner boards and ranges to be
changed in the field with no need for recalibration.

RTD connections can be via 2, 3 or 4wires. With 3- and 4-wire
connections, the transmitter automatically compensates for lead
resistance of the sensor.

Fast read rate at up to 50 or 60 conversions per second while
integrating the signal over a full power line cycle is provided by
Concurrent Slope (Pat 5,262,780) analog-to-digital conversion.
High read rate is ideal for peak or valley capture and for real-time
computer interface and control.

Open sensor indication is standard and may be set up to indi-
cate either upscale or downscale. RTD excitation is provided by
the transmitter.

Standard features of Laureate LT transmitters include:

Ethernet I/O, isolated. Supported protocols are Modbus
RTU and ASCII (tunneled via Modbus TCP) and Laurel ASCII.
The latter is simpler than the Modbus protocol and is recom-
mended when all devices are Laureates. Note that RS232 or
RS485 data I/O in lieu of Ethernet is provided by our LT Series

4-20 mA, 0-20 mA or 0-10V analog transmitter output,
isolated, jumper-selectable and user scalable. All selections
provide 16-bit (0.0015%) resolution of output span and 0.02%
output accuracy of a reading from -99,999 to +99,999 counts
that is also transmitted digitally. Output isolation from signal
and power grounds eliminates potential ground loop problems.
The supply can drive 20 mA into a 500 ohm (or lower) load for
10V compliance, or 10V into a 5K ohm (or higher) load for
2 mA compliance.

Dual solid state relays, isolated. Available for local alarm
or control. Rated 120 mA at 130 Vac or 180 Vdc.

Universal 85-264 Vac power. Low-voltage 10-48 Vdc or
12-32 Vac power is optional.

Discovery and configuration of Laureate Ethernet Nodes is
easily achieved with Laurel's Node Manager Software, and the
discovered transmitters can then be programmed using Laurel's
Instrument Setup Software. Both softwares run on a PC under
MS Windows and can be downloaded at no charge.