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Transmitters, 4-20 mA & Modbus - Panel Meters - Counters - Timers - Ethernet - USB - RS485 - RS232

4-20 mA & Serial Data Output Transmitter for Process & Ratio Signals

Scalable for process signals requiring zero and span adjustment. Ideal for pressure & flow. DIN Rail mounted, digitally programmable.

Process Transmitter with 4-20 mA and Modbus Output

Features

  • 4-20 mA, 0-20 mA, 0-10V or -10V to +10V transmitter output, 16 bits, isolated
  • Ratiometric mode for bridges and potentiometers
  • RS232 or RS485 serial data output, Modbus or Laurel ASCII protocol, isolated
  • Dual 120 mA solid state relays for alarm or control, isolated
  • 200 mV, 2V, 20V, 200V, 300V & 600V DC voltage input ranges
  • 2, 20, 200 mA and 5A DC current input ranges
  • All ranges factory calibrated
  • 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
  • 5V, 10V or 24V dc transducer excitation output, isolated
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
Description

The Laureate 4-20 mA and RS232/RS485 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 rates at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle are 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 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 140 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.

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).

Specifications
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 4-20 mA, 0-20 mA, 0-10 Vdc, -10 to +10Vdc (user 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
Serial Data Output (standard)
Signal Types 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 TCP, 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 Screw terminal connector 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
Transducer Excitation Output (standard)
Output Levels 5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable)
Output Isolation 50V from signal ground
Ratiometric operation Selectable at connector and in software
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 2W typical, 3W with max excitation output
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 Temp. 0°C to 55°C
Storage Temp. -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.
Pinout

Laureate™ Ethernet & 4-20 mA Output Transmitter for Process & Ratio Signals

Laureate LT transmitter pinout

Custom curve linearization

Using a linearizing digital panel meter or transmitter

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.

Ordering Guide
Laureate 4-20 mA & RS232/RS485 Data Output Transmitter for Process & Ratio Signals
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 sales@laurels.com
Configured model number LT20P
Configured price per model $235
Quantity 1
Extended price $235
Quantity
Transmitter
Type
LT  4-20 mA & RS232/RS485 output transmitter $235
LTE  4-20 mA & Ethernet output transmitter $295
Main Board 2  Standard Main Board $0
4  Extended Main Board $40
Note:  Extended allows custom curve linearization and rate from successive readings.  
Power 0  85-264 Vac or 90-300 Vdc $0
1  12-32 Vac or 10-48 Vdc $30
Signal Input Process Signals(e.g., 4-20 mA, 0-5 V)  
P  Field scalable. Default scaling is 4-20 mA in = 4-20 mA out $0
P1  Custom Scaling. Specify min input, min output; max input, max output. $10
Note:  The same DC signal conditioner can be user configured for DC, process, bridge, and potentiometer signals.It is precalibrated in EEPROM for all DC Volt and DC Amp ranges listed for DC transmitters.  
Accessories CBL04  RS232 cable, 7ft. Connects RS232 screw terminals of LT transmitter to DB9 port of PC. $19
CBL02  USB to RS232 adapter cable. Combination of CBL02 and CBL04 connects transmitter RS232 terminals to PC USB port. $39
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