• Provides a Fully Isolated 4/20 mAdc Output Proportional to 4/20 mAdc Input
• Operating Power Derived from the Input Current
• Single or Dual Channel
• Plug-In Terminal Blocks
• Standard DIN-Rail Mount with Easy Snap-On Snap-Off
• User Write-On Label
• Connections Readily Accessible from the Front
• Permanent Warranty

The DM4391 is a loop powered isolator that provides an isolated 4/20mA output proportional to a 4/20 mA input.

All operating power for the circuit is derived from the 4/20 mA input current.

The product is useful for breaking ground loops and for creating a 4/20 mA output in locations where primary power is not available.

A unique feedback system allows the DM4391 to achieve the same linearity as powered isolators and to drive loads from 0 ohms to 1000 ohms without affecting linearity.

The product is available as a single channel or a dual channel unit. The dual channel unit has two totally separate circuits that are fully isolated from each other.

Connections are made via two 4-pin plug-in terminal blocks. These terminal blocks allow the product to be removed without unwiring the connections.

TYPICAL APPLICATIONS
Eliminates ground loops and common mode signals in 4/20 mA current loops for isolation, buffering, noise reduction,  especially where line power is NOT available.

INPUT 4/20 mA INPUT VOLTAGE DROP 5+(I(mA)*(Load+7.65)/850) Typical Drop Drop (V) 6.8 9.2 12.7 18.6 24.5 30.3 Load(ohms) at 20 mA 0 100 250 500 750 1000

OUTPUT CURRENT 4/20 mA DRIVE CAPABILITY 0 to 1000 ohms OUTPUT RIPPLE (Peak-to-Peak) <0.1% of span ISOLATION Breakdown, Output / Input > 1000 VAC rms sinewave Resistance > 500 megohms LINEARITY ± 0.02% of span COMMON MODE REJECTION >100 dB, DC to 60 Hz Voltage Rating >1000 VAC sinewave OPERATING TEMPERATURE 14 to 140 °F/-10 to +60 °C TEMPERATURE STABILITY + (0.02% of span)/°C

	DM4391-1	DM4391-2
Terminal 1 Terminal 2 Terminal 3 Terminal 4 Terminal 5 Terminal 6 Terminal 7 Terminal 8	Input + Input - No Connection No Connection Output + Output - No Connection No Connection	Input 1 + Input 1 - Input 2 + Input 2 - Output 1 + Output 1 - Output 2 + Output 2 -