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

LT DIN Rail Transmitters, 4-20 mA & RS232/RS485 Serial Data Outputs

Same high performance, signal conditioning and programmable features as Laureate digital panel meters, counters & timers.

Laureate transmitter, 4-20 mA and Modbus serial outputs


  • 4-20 mA, 0-20 mA, 0-10V or -10V to +10V transmitter output, 16 bits, isolated
  • RS232 or RS485 serial data output, isolated, Modbus or Laurel ASCII protocol
  • Dual 120 mA solid state relays for alarm or control, isolated
  • Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
  • 5V, 10V or 24V dc transducer excitation output, isolated (most models)
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
  • DIN rail housing with detachable screw-clamp connectors
  • Easy transmitter setup using PC-based Instrument Setup Software
  • Avalaible with signal conditioning for most industrial analog or pulse transducer signals

LT Series Transmitter Selector Guide

  LT Transmitter Signal Input & Function Model
& RS485
1 Quad 4-20 mA Loop Splitter QLS    
2 DC Voltage or Current LT-DC
3 AC RMS Voltage or Current LT-RM
4 Process Voltage or Current LT-P
5 Strain Gauge or Potentiometer Follower LT-SG
6 Load Cell & Microvolt Signals LT-WM
7 Thermocouple (Types J, K, T, E, N, R, S) LT-TC
8 RTD Temperature LT-RTD
9 Resistance in Ohms LT-R
10 Frequency, Rate, Speed LT-FR
11 Pulse Input Totalizer LT-FR
12 Process Signal Totalizer LT-VF
13 Sum, Difference, Ratio, Product of 2 Inputs LT-FR
14 On/Off Duty Cycle LT-FR
15 Stopwatch Timing for Single Events LT-FR
16 Average Time of Periodic Events LT-FR
17 AC Phase Angle and Power Factor LT-FR
18 Quadrature Position or Rate LT-QD

LT Series Transmitter Description

Removable screw terminal connections of Laurel transmitters

LT series DIN rail transmitters & signal conditioners can be interfaced to a wide range of sensors and transducers using one of seven available plug-in signal conditioner boards. The transmitters duplicate the high performance (high accuracy, high read rate) and extensive programmable features of Laureate 1/8 DIN digital panel meters, counters and timers. They utilize the same signal conditioners boards, much of the same firmware, and the same Windows-based free Instrument Setup Software. They come in a compact DIN rail mount package with detachable screw-clamp connectors for easy wiring.

The LT series transmitters accessible from this page include a 4-20 mA, 0-20 mA, 0-10V, or -10V to +10V analog output (isolated, user selectable), an RS232 or RS485 serial data interface (isolated, user selectable), and dual 120 mA solid state AC/DC relays (isolated). An isolated 5, 10 or 24 Vdc transducer excitation output is included with all models other than those with a temperature or AC RMS signal conditioner.

Laurel network with Ethernet-to-analog converter board

For use on a local area network (LAN), up to 30 LT series transmitters can be jumpered for RS485 and be daisy chained to a meter or counter with Laurel's Ethernet-to-RS485 converter board. As an alternative, Laurel's LTE series Ethernet transmitters can be connected directly to a LAN via an Ethernet cable. In both cases, setup is easily achieved using Instrument Setup Software for node discovery and setup of each transmitter.

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