Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter & Totalizer for 0-1 mA, 4-20 mA or 0-10V Signals - 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 &
Totalizer for 0-1 mA, 4-20 mA or 0-10V Signals
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
• 5V, 10V or 24V dc transducer excitation output, isolated
• 0-1 mA, 4-20 mA or 0-10V process signal input, isolated
• Converts signal input to a scaled rate or totalized rate
• Selectable square root for differential flow
• Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
• Digital span adjust from 0 to ±99,999, zero adjust from -99,999 to +99,999
• Output accuracy maintained for narrow or wide spans
• 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 process signal input transmitter and totalizer
accepts 0-1 mA, 4-20 mA or 0-10V signals from flow meters and
other transducers, such as watt meters, to track rate or totalized
rate.
• With a Standard Main Board, the transmitter output can track
rate (such as gallons per minute or watts) or totalized rate
(such as gallons or kilowatt hours) whether the transducer
output is linear or requires square root extraction (differential
pressure flow transducers).
• With an Extended Main Board, the transmitter can also
perform custom curve linearization (provided by a curvilinear
spline fit with up to 180 data points), display 1/ rate (such as
the time it takes a conveyor to pass through an oven), and
perform batch control for repetitive fill operations. Such
applications typically make use of optional dual solid state
relays, which are available as options. External reset of totals
is provided by a special connector.
The signal conditioner board of the transmitter converts the
full-scale 0-1 mA, 4-20 mA or 0-10 V analog signal to a frequency
of 10 kHz to 110 kHz. This frequency is determined by measuring
period over a selected gate time (from 10 ms to 200 s) and taking
the inverse of period. At the lowest frequency of 10 kHz and the
minimum gate time of 10 ms, the transmitter is capable of 25
updates per second. Scaling is done mathematically. Totals are
stored in nonvolatile memory in case of power loss
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.
• Transducer excitation output, isolated. User selectable
5V@100 mA, 10V@120 mA or 24V@50 mA.
• 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.