Acromag 651T-0600 Two-Wire, Single Channel Process Current Transmitter/Isolator

The Acromag 651T-0600 is a single-channel, two-wire process current transmitter and isolator that converts 4–20 mA DC input signals into isolated 4–20 mA DC outputs. It eliminates ground loops and attenuates electrical noise across industrial automation systems through galvanic isolation rated at 500 Vrms. The device incorporates protection against RFI, EMI, ESD, EFT, and surge transients, making it suitable for harsh factory environments.

Technical Specifications

• Input/Output Range: 4–20 mA DC per channel


• Output Current Limiting: <36 mA typical


• Output Ripple: <±0.1% of maximum output span


• Response Time: 98% settling to final value in <15 ms typical (500 Ω load; varies with load resistance)


• Accuracy: Better than ±0.1% of output span (±16 µA) typical, encompassing isolator repeatability, hysteresis, linearity, and adjustment resolution


• Temperature Drift: Better than ±0.006% of input span per °F (±0.01% per °C) over ambient range


• Input Forward Voltage Drop: <1.5 V typical


• Isolation Voltage: 500 Vrms


• Power Supply: 12–36 VDC external loop supply; maximum 60 VDC


• Power Supply Effect: <±0.001% of output span per volt DC change


• Load Resistance Effect: <±0.01% of output span for ±100 Ω variation


• Common Mode Rejection: 100 dB at 60 Hz typical


• Normal Mode Rejection: −5 dB at 60 Hz (100 Ω source) typical


• Input Bandwidth: −3 dB at 45 Hz typical (500 Ω load)


• Output Load Range: 0–600 Ω at 24 VDC; Rload(max) = (Vsupply − 12 V)/0.020 A


• Output Current Sense Resistor: 10 Ω precision ±0.1% (±25 ppm/°C) for non-invasive loop monitoring via SNS and OUT− terminals

Key Features

• DIN rail mountable plastic enclosure (EN50022 35 mm T-rail)


• Compact form factor: 1.05" W × 4.68" H × 4.35" D


• Precision output compliance calculation: Psupply = 12 V + (0.02 × Rload)


• Built-in sense resistor for non-intrusive current measurement

Typical Applications Industrial process control, sensor signal conditioning, PLC analog input conditioning, and distributed I/O systems requiring galvanic isolation and ground loop elimination.