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

The Laureate 4-20 mA and RS232/RS485 output, AC RMS input transmitter 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 resistor to accept the output of 5A current transformers, with no need for a stepdown transformer. The current readings can 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.

True RMS precision circuitry is used to determine the root-mean-square of complex waveforms from DC to 15 kHz. Spikes up to 3.0 times the maximum of each range are accurately measured.

Accuracy is an exceptional 0.03% of full scale for signals from DC to 15 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.

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 are provided by dual solid state relays, which are standard. The transmitter can also capture peak and valley for times as short as one 50/60 Hz AC power line cycle.

AC or DC coupling is jumper selectable. AC coupling accommodates signals from 10 Hz to 15 kHz and is suitable for applications such as measuring the ripple on a DC power supply. DC coupling accommodates signals from 0 Hz to 15 kHz. 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.

Standard features of Laureate LT transmitters include:

4-20 mA, 0-10V or -10V to +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.
Serial communications output, RS232 or RS485 (half or full duplex), jumper selectable. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Laurel ASCII protocol is simpler than the Modbus protocol and is recommended when all devices are Laureates.
Dual solid state relays, isolated, for 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.

Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04).

Standard Features

4-20 mA, 0-20 mA, 0-10V or -10V to +10V transmitter output, 16 bits, isolated
RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, 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 15 kHz
Measurements from 0% to 100% of full scale
0.03% accuracy of full scale at crest factor to 3.0
Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power

Specifications

Laureate 4-20 mA and RS232/RS485 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 to 15 kHz (AC coupling) or DC to 15 kHz (DC coupling)	200.00 mV	10 µV	22 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 to 15 kHz (AC coupling) or DC to 15 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 ETL certified to 300.0 V
Analog Output (standard)
Output Levels	4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10 Vdc (user selectable)
Compliance, 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
Serial Data Output (standard)
Type	RS232 or RS485 (half or full duplex), jumper selectable
Data Rates	300, 600, 1200, 2400, 4800, 9600, 19200 baud
Output Isolation	250V rms working, 2.3 kV rms per 1 min test
Serial Protocols	Modbus RTU, Modbus ASCII, Laurel ASCII
Modbus Compliance	Modbus over Serial Line Specification V1.0 (2002)
Ethernet Connector	RJ45 jack for 10/100 Base-T Ethernet cable
RS232/RS485 Connector	Screw terminals for easy daisy chaining
Digital Addresses	247 for Modbus, 31 for Laurel ASCII
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 Watts
Mechanical
Dimensions	129 x 104 x 22.5 mm case
Mounting	35 mm rail per DIN EN 50022
Electrical Connections	Plug-in screw-clamp connectors
Environmental
Operating Temperature	0°C to 55°C
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 full scale range for the 600V scale is 2000V (20,000 counts), and the full scale range for the 5A scale is 20A (20,000 counts).

Pinout

Datasheet, Manual, Mechanical and Serial I/O info.
Manufacturer site:	https://www.laurels.com/transmitter-ac.php

Standard Features