Phone:(705) 671-2652
    Fax:(705) 671-6127
Home Products Programming Applications Custom Designs Ordering News

  ce.jpg (2571 bytes)See ADU71 USB to Current Output ( 4-20mA, 0-20mA Transmitter )



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

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, and Visual C++ or .NET via standard HID drivers included with Windows 98,2000,XP,7,8,10. 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 ADU72 sample connection diagrams.

Click to view the ADU72 operating commands.

Download ADU72 User Manual ( 1400K )

* View AduHid.dll  on-line software develoment kit ( SDK ) on our Programming page.

Key Benefits, ADU72  USB to Current Input Interface ( 4-20mA, 0-20mA Receiver )

  • Reads loop current with 16-bit resolution and outstanding accuracy.
  • Conformal coating on  sensing circuity ensures reliable operation in humid environments.
  • Retrieved data available in DECIMAL, HEX or CURRENT format.
  • Connect two-wire process transmitters with no need for external power supply.
  • Reads and powers 2-wire, 3-wire* and 4-wire* transmitters.
  • Loop over-current protection ( 26mA)
  • 2500V Isolation from USB connection to loop.
  • Bus Powered
  • High retention USB Connector
  • CE Marked
  • Bi-colour LED status indicator.
  • High quality cage-clamp type terminal blocks.
  • Uses standard HID drivers included with Windows 98SE,2000,XP,7,8,10 32-bit or 64-bit
  • Mini-driver ( DLL ) provided for use with VB,VC, .NET, LabVIEW and TestPoint and others. See Programming Page
  • Meets IEC61000-4-2 ESD protection for USB port.
  • Available in flange ( standard ) or DIN rail mount.
  • * 2-wire and 3-wire power available is 24VDC @ 35mA MAX

Specifications, ADU72  USB to Current Input Interface ( 4-20mA, 0-20mA Receiver )

General ADU72
Supply Voltage NONE ( Bus Powered )

USB Supply Current ( using internal 24V supply )

180mA Typical        300mA Max

USB Supply Current ( using external loop supply ) 90mA Typical          100mA Max
Isolation 2500V
Operating Temperature -25C Min  to  60C Max
Current Loop Input
Resolution 16 Bits
Range 0-20mA
Total Unadjusted Error +/- 0.05% FSR MAX
Full Scale Error +/-  0.03% FSR MIN  
Temperature Stability +/- 50 ppm FSR/Degree C
Maximum 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

Pricing,  ADU72  USB to Current Input Interface ( 4-20mA, 0-20mA Receiver )

( Includes 10' USB cable )

Description $US
ADU72 $169.00
ADU72 QTY 5-9 $158.00
ADU72 QTY 10+ $149.00

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

For example: ADU72-FLANGE      ADU72-DIN 


ADU products do not ship with drivers on floppy or CD-ROM. Drivers, including complete SDK, can be downloaded or viewed on-line in the Programming Section.

Pricing indicated is for ADU72 USB interface with flange mount enclosure, printed user manual,  and a 10' USB cable.  

Back to Products Page

Contact Information
Address Telephone Electronic Mail
Ontrak Control Systems Inc.
764 Notre Dame Ave., Unit #1
Tel: (705) 671-2652 General Information Sales or Support
Sudbury,Ontario Fax:(705) 671-6127
CANADA P3A 2T2    
Next-Day shipping anywhere in Continental U.S. via Fed-Ex
Copyright 2012 ONTRAK CONTROL SYSTEMS 764 Notre Dame Ave, Unit #1 , Sudbury, Ontario, CANADA P3A 2T2  
"Quality serial Data Acquisition Interfaces"           PH. (705) 671-2652 FAX (705) 671-6127