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LTE42R3 DIN Rail Ethernet and 4-20 mA Transmitter by Laurel Electronics

0-2.0000 kohms resistance measurement, Ethernet I/O plus 4-20 mA or 0-10V analog output and dual relays

Model LTE42R3 includes:

  • 0-2.0000 kohms resistance measurement
  • 4-20 mA or 0-10V isolated analog output
  • Modbus or ASCII serial data output
  • Power over Ethernet
  • Two 120 mA solid state relays

  • 35 mm DIN rail mounting

Model LTE42R3 by Laurel Electronics is a 0-2.0000 kohms resistance measurement, Ethernet I/O plus 4-20 mA or 0-10V analog output and dual relays. DIN rail transmitter. Model is configured for Extended main board and Power over Ethernet.

The Laureate Resistance Transmitter is factory calibrated for five jumper selectable resistance ranges from 20 ohms to 200 kohm. Accuracy is an exceptional +/- 0.01% of full scale +/- 2 counts. Resolution is one part in 20,000. In the 20-ohm range, resolution is 1 milliohm, making the transmitter suitable for contact resistance and conductance measurements.

Transmitter connections can be via 2, 3 or 4 wires. With 4-wire hookup, 2 wires are used for excitation and two separate wires are used to sense the voltage across the resistance to be measured, thereby eliminating any lead resistance effects. With 3-wire hookup, the transmitter senses the combined voltage drop across the RTD plus two excitation leads. It also senses the voltage drop across one excitation lead, and then subtracts twice this voltage from the combined total. This technique effectively subtracts the lead resistance if the excitation leads are the same.

All resistance ranges are digitally calibrated at the factory, with calibration factors stored in EEPROM on the signal conditioner board. This allows ranges and signal conditioner boards to be changed in the field without recalibrating the transmitter. If desired, the transmitter can easily be calibrated using external standards plus scale and offset in software.

Fast read rate at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle 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.

Visit 4-20 mA Current Output Transmitter for Resistance Input in Ohms for detailed transmitter information, specifications, dimensions and pricing.

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