The Laureate 4-20 mA output, process signal input transmitter provides zero and span adjustment for use with a wide range of industrial transducers. Six DC voltage and four DC current input ranges are jumper selectable. The two most sensitive voltage ranges, 200.00 mV and 2.0000V, provide a high input impedance of 1 GΩ to minimize the load on the voltage signal.
The transmitter can be set to a ratio mode (or potentiometer follower mode) by making selections at the connector and in software. In this mode, the transmitter output tracks a ratio of the applied excitation voltage and is unaffected by changes in the excitation voltage. This capability is used for resistive bridge sensors and voltage dividers, such as potentiometers which track wiper position. Ratiometric measurements provide an exceptional accuracy of 0.01% of reading ± 2 counts.
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. The internal digital readings and analog output can be individually selected to be either unfiltered or filtered.
Standard features of Laureate LTE transmitters include:
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 from this website at no charge.
|Analog Input||Range||Resolution||Reading Accuracy||Input Ohms|
|DC Voltage||±200.00 mV||10 µV||0.01% FS ± 2 cts||1 GΩ|
|±2.0000 V||100 µV||0.01% FS ± 2 cts||1 GΩ|
|±20.000 V||1 mV||0.01% FS ± 2 cts||10 MΩ|
|±200.00 V||10 mV||0.01% FS ± 2 cts||10 MΩ|
|±600.0 V*||100 mV||± 0.4 V||10 MΩ|
|DC Current||±2.0000 mA||0.1 µA||0.01% FS ± 2 cts||100 Ω|
|±20.000 mA||1 µA||0.01% FS ± 2 cts||10 Ω|
|±200.00 mA||10 µA||0.01% FS ± 2 cts||1 Ω|
|±5.000 A||1 mA||±10 mA||0.01 Ω|
|* Range not ETL certified.|
|Reading Resolution||16 bits (65,536 steps)|
|Reading Accuracy||0.01% of full scale ± 2 counts (except 5A range) for absolute measurements.
0.01% of reading ± 2 counts for ratiometric measurements.
|Update Rate, Max||50/sec at 50 Hz, 60/sec at 60 Hz|
|Max applied voltage||600 Vac for 20, 200 & 600 V ranges, 125 Vac other ranges|
|Over-current protection||25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5 A|
|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 Protocols||Modbus TCP, Modbus RTU, Modbus ASCII, Laurel ASCII|
|Modbus Compliance||Modbus over Serial Line Specification V1.0 (2002)|
|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|
|Transducer Excitation Output (standard)|
|Output Levels||5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable)|
|Output Isolation||50V from signal ground|
|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||2W typical, 3W with max excitation output|
|Dimensions||129 x 104 x 22.5 mm case|
|Mounting||35 mm rail per DIN EN 50022|
|Connectors||Detachable screw-clamp connectors for signal and power RJ45 jack for Ethernet|
|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.|
A Laureate process meter or transmitter with the Extended main board option allows exceptionally accurate custom curve linearization. For setup, up to 180 data points can be entered into a spreadsheet. The system then creates multiple non-linear spline-fit segments, which provide much better accuracy than linear segments. One application, as illustrated, is the readout of volume of irregularly shaped tanks based on measured liquid level or pressure. Altimeters and thermistors are further applications.