250T / 350T / 450T-DC

Key Features:

Designed to convert sensor inputs to proportional process current or voltage output signal with Excellent accuracy and stability in harsh industrial environments.

• 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.
• Compact, 1-inch wide housing uses less space for easier installation in control panels.
• Low power consumption. 350T units operate on currents as low as 9mA to help prevent expensive upgrades to larger power supplies.
• 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: -13 to 185°F (-25 to 85°C)

Product Details

Input Ranges

DC voltage,
±100mV to ±100.0V DC
DC current,
0 to 20mA (10 ohm input load)
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-power)
350T: DC voltage source (see table below)
Output range Power
– 4 to 20mA 10 to 36V DC @ 30m
– 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 60
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).
– ±0.1% of calibrated span or ±0.25 mV, whichever is greater. Includes repeatability, 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: 120dB at 60Hz, 100 ohm unbalance.
– Normal Mode: 30dB at 60Hz, 100 ohm source.
Response Time
– Output reaches 98% of output span in 300mS.
-3dB at 3 Hz, typical.
Output Compliance
– 250T: RLOAD(max.) = (VSUPPLY- 12V) / 20mA.
– 350T: RLOAD(max.) = (VSUPPLY- 2.5V) / 20mA.
– 450T: RLOAD= 600 ohms