Description

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 Icon Download ADU72 3D STEP files for FLANGE or DIN mounting types.

Key Features

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 32-bit or 64-bit
Mini-driver (DLL) provided. See Programming Page for details
Meets IEC61000-4-2 ESD protection for USB port.
2-wire and 3-wire power available is 24VDC @ 35mA MAX
Available in flange (standard) or DIN rail mount.

Typical Applications

4-20mA Transducer Interface
Industrial Instrumentation Systems
SCADA Systems
OEM Instruments Embedded Control

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
Data Format	HEX or DECIMAL or CURRENT
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