Power Transmitter 250T-RB 350T-RB 450T-RB

The 250T-RB 350T-RB 450T-RB convert Platinum or Copper RTD Inputs into proportional process current or voltage output signals.

250T: Loop-powered transmitter series

350T: DC-powered transmitter series

450T: AC-powered transmitter series

The Acromag 250T-RB 350T-RB 450T-RB are a Loop, DC or AC Power Transmitter.

Firstly, they accept 100 ohm Pt RTD (2, 3 or 4 wire) and 10 ohm Cu RTD (2,3 or 4 Wire). They output 4 to 20mA DC Current or 0 to 5V or 0 to 10V DC Voltage. Power requirements differentiate depending on the model used.

Power Requirements:

250T: 12 to 50V DC @ 20mA (loop-powered)


350T: DC Voltage Source

Output Range             Power

4 to 20mA 10 to 36V DC @ 30mA

0 to 5V 10 to 36V DC @ 9mA

0 to 10V 12.5 to 36V DC @ 9mA


450T: 115V or 230V AC, ±10%, 50 to 60Hz

Output Range            Power

4 to 20mA 115V AC @ 0.050A

4 to 20mA 230V AC @ 0.025A

0 to 5V, 0 to 10V 115V AC @ 0.020A

0 to 5V, 0 to 10V 230V AC @ 0.010A


Other features of the Loop, DC or AC Power Transmitter 250T-RB 350T-RB 450T-RB include:

  • Excellent accuracy and stability ensure reliable measurements in harsh industrial environments
  • RTD signal linearisation improves accuracy and reduces drift
  • Break RTD detection indicates open
  • Failures RTD with upscale operation
  • RTD lead wire compensation eliminates the effect of the wire’s resistance
  • RFI and EMI resistance minimise the effects of environmental noise
  • 75% span adjustment enables precise application calibration
  • Low power consumption (350T as low as 9mA)
  • 1500V AC peak isolation (250V AC or 354V DC continuous) prevents ground loops

o 250T models: Input isolated from output/power

o 350T models: Input isolated from output and power. Output and power share a common

o 450T models: 3-way isolation. Input, output, and power circuits are isolated from each other

  • Operating temperature range: -25 to 85°C
  • DIN rail G or T mount
  • No certification/approval required


Finally, for more information, contact us.


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250T- RB _350T_450T-RTD-Input-Isolated-Transmitters