(under construction)

Description

The Wheatstone bridge resistance measurement node gives a simple solution to field measurements of common low-value resistive sensors in wheatstone bridge configurations. It can measure values of a resistive sensor in quarter-bridge, half-bridge or full-bridge configurations, particularly load-cell and strain-gauge sensors. Basicly, this is a strain-gauge amplifier with a CANopen interface.

Functionality

• Full-bridge: 2mV/V for 100%
• Excitation sense for cable loss compensation
• Sample rate 10Hz down to 1/60Hz
• Cable compensation using 3-wire measurements
• Various filtering options
• Capture min/max/avg at slow message rate
• Possibility for custom firmware with specific signal processing functions

Network functions (via a gateway)

• Stream data via JSON
• View data directly via HTML, no cloud needed
• Logging to micro-SD card
• Bus ID assigned via serial number
• Calibration, configuration & firmware update

Specifications

• Load-cell power 3.0V via 250Ω
• 24-Bit delta-sigma analog digital converter
• Measurement circuit galvanically isolated from CAN-bus using 500V functional isolation
• Grounded 5.2V/250Ω diode barriers for intrinsic safe sensor signals
• Operating voltage 9-38VDC, <1W
• 6-Way 3.5mm screw terminal connection for sensor
• 5-Pin spring-contact termination for CAN, power and shield
• Aluminium IP67 enclosure 64x58mm, height 35mm
• Integrated mounting flanges (94mm wide), optionally without flanges
• Two M16 brass cable gland entries in sides
• Optional with 5-pole industrial M12 plug connection
• ATEX (IEC 60079) 'ic', 'ec', 'mc' & 'tc'