Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Thermocouple Types J, K, T, E, N, R, S - Manual

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Ethernet & 4-20 mA Output Transmitter
for Thermocouple Types J, K, T, E, N, R, S
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 thermocouple types J, K, T, E, N, R, S each in one range
• User selectable input span from entire thermocouple 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
• DIN rail mount housing only 22.5 mm wide, detachable screw-clamp connectors
• Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
• Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply
Description
The Laureate thermocouple transmitter provides a linearized,
highly accurate, stable and repeatable transmitter output for
thermocouple types J, K, T, E, N, R or S. The thermocouple type
and temperature range, specified in °C or °F, are user-selectable.
The temperature range can be as wide as the entire span of the
thermocouple 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 thermocouple ranges is performed at
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.
Cold junction compensation automatically corrects for tempera-
ture variations at the thermocouple reference junction at the
transmitter. Open sensor indication is standard and may be set
up to indicate either upscale or downscale.
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.
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.
Standard features of Laureate LTE 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
transmitters.
• 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.