4-20 mA Current Output Transmitter for Process Signal Input

(Scalable for process signals requiring zero and span adjustment. Ideal for pressure & flow. DIN Rail mounted, digitally programmable.)
Standard Main Board
  • 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
  • Digital zero adjust from -99,999 to +99,999
  • 4-20 mA, 0-20 mA or 0-10V transmitter output, jumper selectable, isolated
  • Output resolution: 0.0015% of span (16 bits)
  • Output accuracy: ±0.02% of span
  • Output update rate to 60/sec
  • Switching supply for 85-264 Vac
  • Detachable screw-clamp connectors
  • Easy setup with PC-based Instrument Setup Software
  • DIN rail mount housing only 22.5 mm wide
  • 5V, 10V or 24V dc transducer excitation output, isolated
  • Dual solid state relays for alarm or control, isolated
  • RS232 or RS485 serial communications, isolated
  • Universal AC power, 85-264 Vac
  • Priced at only $270 (basic AC transmitter)
  • Extended main board for custom curve linearization & rate from successive readings
  • Low voltage power, 10-48 Vdc or 12-32 Vac
The Laureate 4-20 mA output, process signal input transmitter provides six DC voltage input ranges and four DC current input ranges for use with a wide range of transducers whose output requires zero and span adjustment. All ranges are factory calibrated and jumper selectable. The two most sensitive voltage ranges, 200 mV and 2V, provide a high input impedance of 1 Gohm to minimize the load on the voltage signal.

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.

Three analog transmitter settings are jumper selectable: 4-20 mA, 0-20 mA or 0-10V. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy. The output tracks the reading from -99,999 to +99,999 counts that would be transmitted digitally. For DC signals, this reading has a rated accuracy of ±0.01% of full scale input and can be scaled in software. 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.

Standard features of Laureate transmitters include:

  • Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA, 0-20 mA or 0-10V levels.
  • Serial communications, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or Laurel ASCII protocol.
  • Dual solid state relays for control or alarm, isolated. Rated 120 mA at 130 Vac or 170 Vdc.
  • Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50 mA.
  • Universal AC power supply for 85-264 Vac.

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).


Analog Input Range Input Ohms
DC Voltage 200.00 mV 1 Gohm
DC Voltage 2.0000 V 1 Gohm
DC Voltage 20.000 V 10 Mohm
DC Voltage 200.00 V 10 Mohm
DC Voltage 600.0 V 10 Mohm
DC Current 2.0000 mA 100 ohms
DC Current 20.000 mA 10 ohms
DC Current 200.00 mA 1 ohm
DC Current 5.000 A 0.01 ohm
Input Resolution 16 bits (65,536 steps)
Input Accuracy ±0.01% of full scale ± 2 counts
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 (jumper selectable)
Compliance, 4-20 mA 10V ( 0-500 ohm load )
Compliance, 0-10V 2 mA ( 5 kOhm load or higher)
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
Transducer Excitation Output (standard)
Output Levels 5V@100 mA, 10 @120 mA, 24V@50 mA (jumper selectable)
Output Isolation 50V from signal ground
Dual Relay Output (standard)
Relay Type Two solid state relays, SPST, normally open, Form A
Load Rating 130 mA at 140 Vac or 180 Vdc
Serial Communications (standard)
Signal Types RS232 or RS485 (half or full duplex)
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 Modes RTU or ASCII
Modbus Compliance Modbus over Serial Line Specification V1.0 (2002)
Digital Addressing 247 Modbus addresses.
  Up to 32 devices on an RS485 line w/o a repeater.
Power Input
Standard Power 85-264 Vac or 90-300 Vdc (DC operation not UL approved)
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 2Watts
Dimensions 129 x 104 x 22.5 mm case
Mounting 35 mm rail per DIN EN 50022
Electrical Connections Plug-in screw-clamp connectors
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.
Pinout Laureate 4-20 mA Transmitters Analog Input Rate Transmitter & Totalizer Generators
Custom curve linearization
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.
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5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001