Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for DC Voltage or Current - 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 DC Voltage or Current
Standard Features
• ±0.2, ±2, ±20, ±200, ±300V and ±600V voltage input ranges
• ±2, ±20, ±200 mA and ±5A current input ranges
• All input ranges user selectable and factory calibrated
• 4-20 mA or 0-10V transmitter output, jumper selectable, isolated
• Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
• RS232 or RS485 serial data output, half or full duplex, isolated
• Modbus RTU, Modbus ASCII or Laurel ASCII protocol
• 5V, 10V or 24V dc transducer excitation output, isolated
• Dual solid state relays for alarm or control, isolated
• Universal AC power, 85-264 Vac, or low voltage power, 10-48 Vdc or 12-32 Vac
• Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply
• Custom curve linearization and rate from successive readings (optional)
Description
Laureate DC input transmitters provides six voltage input
ranges and four current input ranges, all factory calibrated and
jumper selectable. The 200.00 mV and 2.0000 V ranges provide
a high input impedance of 1 GΩ to minimize the load on the
voltage signal. A 5.000A range measures the IR drop across a
built-in 10 mΩ current shunt. The transmitters can also easily be
scaled in software for use with external shunts.
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.
Digital signal filtering modes are selectable for stable readings
in electrically noisy environments.
• An unfiltered selection provides true peak and valley
readings and aids in control applications.
• A batch average filter selection averages each 16
conversions for an update every 1/4 sec.
• An adaptive moving average filter selection provides a
choice of 8 time constants from 80 ms to 9.6 s. When a
significant change in signal level occurs, the filter adapts by
briefly switching to the shortest time to follow the change, then
reverts back to its selected time constant. An Auto setting
selects the time constant selection based on signal noise.
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 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.
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.