Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Strain Gauge & Potentiometer Input - 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 Strain Gauge & Potentiometer Input
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
• 5V, 10V or 24V dc transducer excitation output, isolated
• 200 mV, 2V, 20V, 200V & 300V input ranges
• Resolution to 10 µV
• Digital span adjust from 0 to ±99,999, zero adjust from -99,999 to +99,999
• 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
• Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply
Description
The Laureate strain gauge transmitter is ideal for use with
strain gauges, load cells, bridge networks and potentiometer
follower circuits whose output requires zero and span adjust-
ment. An isolated 120 mA, 10V transducer excitation supply is
built in and can power up to four 350 ohm load cells in parallel.
The two most sensitive voltage ranges, 200 mV and 2V, provide
a high input impedance of 1 GΩ to minimize the load on the
voltage signal. Strain gauges with a 20 mV output can be
internally scaled to display up to 10,000 internal counts, while
outputs of 200 mV can be scaled to 99,999 internal counts. For
ten times higher sensitivity, use Laureate load cell transmitters,
which allow a 20 mV output to be scaled to the full 99,999
counts.
Fast read rates 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. The internal digital readings
and analog output can be individually selected to be either
unfiltered or filtered.
• An unfiltered selection updates after each conversion for
fastest response, up to 60/sec, while integrating the input
signal over a full power cycle. Fast read rate 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. Another choice is
Auto, which provides an automatic time constant selection
based on the signal noise characteristics.
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.
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.