250T-FQ, 350T-FQ, 450T-FQ: Frequency Input Loop, DC, or AC-Power Transmitter

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

Models

250T: Loop-powered transmitter series
350T: DC-powered transmitter series
450T: AC-powered transmitter series

Performance Specifications

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.
Ambient Temperature Effect:
Less than ±0.01% of output span per °F (±0.018% per °C)
(Specification includes the combined effects of zero and span over temperature)
Noise Resistance:
RFI: Less than ±0.5% ,of output span effect
EMI: Less than ±0.25% of output span effect
Noise Rejection:
Common Mode: 115dB at 60Hz, 100 ohm unbalance
Normal Mode: Not Applicable
Response Time:
Time for output to reach 98% of output span depends on jumper-selectable frequency range.
Range 1: 8.0 sec response time (98%)
Range 2: 5.0 sec response time (98%)
Range 3: 0.4 sec response time (98%)
Bandwidth: -3dB at 25,600Hz, typical
Output Compliance:
250T: RLOAD (max.) = (VSUPPLY – 12V) / 20mA
350T: RLOAD (max.) = (VSUPPLY – 2.5V) / 20mA
450T: RLOAD = 600 ohms