Frequency Input Power Transmitter

These transmitters take periodic or pulse waveform signals. Such as those coming from tachometers, magnetic transducers or turbine flow meters and provide a proportional process current or voltage output signal.

250T: Loop-powered transmitter series

350T: DC-powered transmitter series

450T: AC-powered transmitter series

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

Firstly, the performance specifications consist of:

Input Ranges: Frequency: span ranges 0 to 25.6KHz, field-selectable, direct coupled inputs, ±25mV to 150V RMS


Output Ranges:

DC Current: 4 to 20mA

DC Voltage: 0 to 5V or 0 to 10V


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


Ambient Temperature Range:

Operating: -13 to 185°F (-25 to 85°C)

Storage: -40 to 185°F (-40 to 85°C)

Accuracy: ±0.1% of calibrated span. Includes repeat ability, hysteresis, terminal point linearity, and adjustment resolution.

Features of the Frequency Input Power Transmitter 250T-FQ, 350T-FQ, 450T-FQ includes:

  • Excellent accuracy and stability ensure reliable measurements in harsh industrial environments
  • RFI and EMI resistance minimize the effects of environmental noise 90% span adjustment enables precise application calibration
  • Quartz crystal time-base design improves temperature performance
  • Field-selectable time constants optimize output response time and ripple characteristics
  • Selectable threshold circuits accept uni-polar/bipolar inputs (0V bipolar, 1.5V unipolar)
  • Excitation/pull-up circuit adds flexibility
  • 1500V AC peak isolation (250V AC or 354V DC continuous) prevents ground loops
  • 250T models: Input isolated from output/power
  • 350T models: Input isolated from output and power. Output and power share a common
  • 450T models: 3-way isolation. Input, output, and power circuits are isolated from each other
  • Operating temperature range: -25 to 85°C


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