RTD Input Two-Wire Transmitter TT231

This space saving two wire transmitter converts a 100 ohm Platinum RTD sensor input to a proportional 4-20mA signal.

The transmitter provides sensor excitation plus performs linearisation, lead wire compensation and lead break detection.

The Acromag TT231 is a RTD Input Two-Wire Transmitter.

Firstly, it accepts 100 ohm PT RTD or 0-900 ohm inputs. Producing a 4-20mA sink/source output where power is received from the output loop current or a DC supply when using a three wire connection.

Secondly, to prevent group loop error between a grounded PC and a grounded input signal, Acromag recommends use of a USB isolator. Setup and calibration are easy. It has a convenient USB connection to your PC and Acromag’s Windows configuration software.

Finally, with advanced signal processing capabilities, variable input range and USB programming make this instrument a versatile temperature measurement device. Therefore, it can withstand harsh industrial environments and operate across a wide temperature range with very low drift. It features RFI, EMI, ESD, EFT and surge protection as well as low radiated emissions.

Other features of the RTD Input Two-Wire Transmitter TT231 include:

  • Easy setup and digital calibration via USB with Windows configuration software
  • Flexible RTD or linear resistance input ranges (any 100 ohm Pt RTD with 375-393 alpha)
  • Space-saving 12.5mm unit with pluggable terminals for convenient wiring
  • As well as high accuracy, linearity, stability, and reliability
  • Advanced analog signal conditioning
  • ASIC eliminates digitisation errors
  • Low temperature drift (<80ppm/°C)
  • Also supports sink or source output wiring
  • Programmable over/under-range limits
  • Selectable upscale or downscale operation for sensor errors and lead-break detection
  • NAMUR-compliant output loop current
  • Shock (50g) and vibration (5g) resistant
  • Mounts on Type T DIN-rail
  • Wide ambient operation (-40 to 80°C)
  • CE compliant. UL/cUL Class I Div 2, ATEX / IECEx Zone 2 approvals


Finally, for more information, contact us. or check out the video below to learn more.


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