USB To Current Input Interface (4-20mA, 0-20mA)

With 24V Loop Power Supply

(Similar Product:ADU71 USB to Current Output Interface)

ADU72 USB to 0-20, 4-20mA Current Input Interface


The ADU72 USB to Current Input interface enables measurement of 4-20mA and 0-20mA signals from standard process transmitters via a single USB connection. The ADU72 internally generated 24VDC loop supply eliminates the need for an external loop power supply allowing direct connection of 2-wire process transmitters. This low-cost USB to Current Input Interface is easy to use with VB, VB.NET, Visual C++, C , MATLAB, LABView etc. via standard HID drivers included with Windows. A mini-driver (DLL)* is also provided, allowing control using standard ASCII commands using familiar readfile and writefile commands. The ADU72 includes a 10' USB cable and is available in a flange mount enclosure with a DIN rail mount option.

Click here to view sample connection diagrams.

Download the ADU72 Operating Commands

Download the ADU72 User Manual

ADU72 3D Model IconDownload ADU72 3D STEP files for FLANGE or DIN mounting types.

Key Features

Technical Specification

ADU72 Features
Supply Voltage NONE (Bus Powered)
USB Supply Current (internal 24V supply) 180mA Typical 300mA Max
USB Supply Current (external loop supply) 70mA Typical 100mA Max
Isolation 2500V
Operating Temperature -25C Min to 60C Max
Current Loop Input
Resolution 16 Bits
Range 0-20mA
Total Absolute Unadjusted Error +/- 0.05% FSR MAX
Full Scale Error +/- 0.03% FSR MIN
Temperature Stability +/- 50 ppm FSR/Degree C
Max Recommended Sample Rate 500 s/s
Operating Environment Humidity 0 to 90% RH (non condensing)
Loop Compliance Voltage 4V
Internal Loop Power Supply
Voltage 24V Nominal
Isolation 2500V
Maximum Supply Current Output 35mA
Special Functions
Internal Loop Power Supply Internal 24VDC supply eliminates the need for an external loop power supply.
Mounting Options Flange Mount (STANDARD), DIN Rail


ADU72 Qty 1-4


ADU72 Qty 5-9


ADU72 Qty 10+


IMPORTANT: Specify mounting option when ordering.-FLANGE(standard) or -DIN . See Mounting Options for details.

Mounting Options

ADU72 USB 4-20mA Module FLANGE Mount
Comes standard with ADU72.
ADU72 USB 4-20MA Module DIN Mount
A $5 surcharge applies to the DIN RAIL option.