Laurel Electronics
Call (714) 434 6131 for Product Assistance
Panel Meters - Counters - Timers - Transmitters, 4-20 mA & Modbus - Ethernet - USB - RS485 - RS232

Ethernet & 4-20 mA Transmitter for AC RMS Voltage or Current

Responds in 1 power line cycle response with 0.1% accuracy. DIN Rail mounted, digitally programmable.

Ethernet transmitter


  • Ethernet data I/O, Modbus TCP protocol.
  • 4-20 mA, 0-20 mA or 0-10V transmitter output, 16 bits, jumper selectable, isolated.
  • Dual 120 mA solid state relays for alarm or control, isolated.
  • True AC RMS measurement in one 50/60 Hz AC line cycle.
  • 0.2, 2, 20, 200, 300V and 600V AC voltage ranges.
  • 2, 20, 200 mA and 5A AC current ranges.
  • All input ranges user-selectable and factory calibrated.
  • AC or DC coupling for signals from DC to 10 kHz.
  • 0.03% accuracy of full scale, 0% to 100% of full scale, 3.0 crest factor.
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power.
  • -X extended operating temperature option from -40°C to 70°C

The Laureate AC RMS input transmitter and signal conditioner provides six voltage input ranges and four current input ranges, all factory calibrated and jumper selectable. A special 5.000A range utilizes a built-in 0.01 ohm shunt to accept the output of 5A current transformers, with no need for a stepdown transformer. The current readings can easily be scaled digitally as needed. High common mode rejection allows stable readings with current shunts located on the high side of the line. Digital filtering is selectable for noisy signals.

LTE transmitter AC

True RMS precision circuitry is used to determine the root-mean-square of complex waveforms from DC to 10 kHz. Spikes up to 3.0 times the maximum of each range are accurately measured.

Accuracy is 0.03% of full scale for the transmitters with 1 Megohm input resistance, signals from DC to 10 kHz, and signal amplitude down to 0. The crest factor (Vp / Vrms) is 3.0 at full scale, increasing to 300 for a signal amplitude of 1% of full scale. A version with 10 Megohm input resistance is available as a factory special, but decreases the maximum frequency from 10 kHz to 1 kHz for three of the voltage ranges.

True RMS readings in as little as one 50/60 Hz AC line cycle are unmatched in the industry. Such a high read rate allows anomalies to be detected and alarmed before they become expensive problems. On/off control and alarm can be achieved dual solid state relays, which are standard. Transmitter can also capture peak and valley for times as short as one 50/60 Hz AC power line cycle.

Standard features of Laureate LTE transmitters and signal conditioners include:

  • Ethernet I/O, isolated. The supported protocols are Modbus RTU and ASCII, which are tunneled via Modbus TCP. Note that RS232 or RS485 data I/O is provided by Laurel's 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 0 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.
  • AC or DC coupling is jumper selectable. AC coupling is suitable for applications such as measuring the ripple on a DC power supply. Multiple integral cycles are averaged for signals above 50/60 Hz. A single cycle is captured for signals from 3 Hz to 50/60 Hz. Below 3 Hz and at DC, the capture rate is every 333 ms.

Node discovery and configuration of Laureate Ethernet transmitters are easily achieved with Laurel's Windows based Instrument Setup Software. Additional features are provided by Laurel's Windows based Node Manager Software, such as the ability to send emails or test messages either periodically or in the event of an alarm. Both softwares run on a PC under MS Windows, are at no charge, and can be downloaded from this website.

Laureate Ethernet network by Laurel Electronics
Laureate Ethernet & 4-20 mA Transmitter for AC RMS Voltage or Current Input
Analog Input Range Resolution Input Ohms
Error at 25°C
Voltage Ranges
0-100% of FS
10 Hz - 10 kHz (AC coupling)
DC - 10 kHz (DC coupling)
200.00 mV 10 µV 1 MΩ 0.03% FS ± 2 cts
2.0000 V 100 µV 1 MΩ 0.03% FS ± 2 cts
20.000 V 1 mV 1 MΩ 0.03% FS ± 2 cts
200.00 V 10 mV 1 MΩ 0.03% FS ± 2 cts
600.0 V* 100 mV 1 MΩ ± 0.8 V
300.0 V 100 mV 1 MΩ ± 0.8 V
Current Ranges
0-100% of FS
10 Hz - 10 kHz (AC coupling)
DC - 10 kHz (DC coupling)
2.0000 mA 0.1 µA 100 Ω 0.03% FS ± 2cts
20.000 mA 1 µA 10 Ω 0.03% FS ± 2cts
200.00 mA 10 µA 1 Ω 0.03% FS ± 2cts
5.000 A 1 mA 0.01 Ω ± 20 mA
* Range not ETL certified
Analog Output (standard)
Output Levels 0-20 mA or 0-10 Vdc (selectable)
Compliance, 4-20 mA 10V (0-500Ω load)
Compliance, 0-10V 2 mA (5 kΩ load)
Output Resolution 16 bits (65,536 steps)
Output Accuracy 0.02% of output span plus conversion accuracy
Output Isolation 250V rms working, 2.3 kV rms per 1 minute test
Ethernet Data I/O (standard)
Type 10/100 Base-T Ethernet per IEEE 802.3
Data Rates 300, 600, 1200, 2400, 4800, 9600, 19200 baud
Output Isolation 250V rms working, 2.3 kV rms per 1 min test
Serial Protocol Modbus TCP
Modbus Compliance Modbus over Serial Line Specification V1.0 (2002)
Digital Addresses 247
Dual Relay Output (standard)
Relay Type Two solid state relays, SPST, normally open, Form A
Load Rating 120 mA at 140 Vac or 180 Vdc
Power Input
Standard Power 85-264 Vac or 90-300 Vdc
Low Power Option 10-48 Vdc or 12-32 Vac
Power Frequency DC or 47-63 Hz
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Power Consumption 2.5W typical at 24V
Dimensions 129 x 104 x 22.5 mm case
Mounting 35 mm rail per DIN EN 50022
Signal & Power Detachable screw-clamp connectors
Operating Temperature 0°C to 55°C standard, -40°C to 70°C with -X option
Storage Temperature -40°C to 85°C
Relative Humidity 95% at 40°C, non-condensing
Cooling Required Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan.
*   For purposes of accuracy calculation, the 600V range is 2000V (20,000 counts), and the 5A range is 20A (20,000 counts).
Laureate Ethernet & 4-20 mA Transmitter for AC RMS Voltage or Current Input
LTE Ethernet transmitter pinout, analog input
For applications assistance, phone 714-434-6131 ext. 104, or email
Ordering Guide
Laureate Ethernet & 4-20 mA Transmitter for AC RMS Voltage or Current Input
Click on the radio buttons to build a model number with pricing as shown below. Prices are in US dollars and do not include shipping or duty charges (export sales). Please see our explanations and limitations applicable to pricing and online orders. Prices shown are in US Dollars and are Laurel's manufacturer's suggested retail price (MSRP) in the USA. Orders are processed manually, not directly by our shopping cart system. You don't have to supply credit card information when placing an online order.

North American Orders. Laurel does not sell factory-direct in the USA or Canada. Online sales orders are filled through distribution. During the ordering process, you will have the chance to select an authorized Laurel distributor, or you can ask Laurel to refer you to a distributor. The distributor will then contact you to quote shipping, tax and duty (where applicable), and arrange for payment.

International Orders. If your ship-to address indicates that you are outside of the USA or Canada and Laurel has a distributor in your country, we will forward your order to that distributor for follow-up. If Laurel does not have a distributor in your country, we will email you an order acknowledgment and a pro forma invoice which states the product price, shipping charges, and wire transfer information, which includes a $25 bank wire transfer fee.

Questions about your order? Please email your distributor or
Transmitter Type LTE  4-20 mA & Ethernet outputs transmitter $388
LT  4-20 mA & RS232/RS485 outputs transmitter $164
Main Board 2  Standard analog input. $0
4  Extended analog input. $33
Note:Extended allows custom curve linearization and rate from successive readings. Not applicable to temperature.  
Power 0  Isolated 85-264 Vac or 90-300 Vdc $89
1  Isolated 12-32 Vac or 10-48 Vdc $89
Signal Input True AC RMS Volts  
RMV1  200.00 mV $135
RMV2  2.0000 V $135
RMV3  20.000 V $135
RMV4  200.00 V $135
RMV5  600.0 V (range not ETL certified) $135
RMV6  300.0 V (range ETL certified) $135
True AC RMS Amps  
RMA1  2.0000 mA $135
RMA2  20.000 mA $135
RMA3  200.00 mA $135
RMA4  5.000 A $135
Note:  The same AC RMS signal conditioner can be user configured for AC Volts or AC Amps, and is precalibrated in EEPROM for all AC Volt and AC Amp ranges listed.  
Add-on Options -X  Extended operating temperature option from -40°C to 70°C $33
Configured model number LTE20RMV1
Configured price per model $612
Quantity 1
Extended price $612
Legal Information
facebook   G+   twitter   linkedin
© 1990-2024 Laurel Electronics