Data acquisition and Control Unit

• It manages pressure/volume controller, load frames, cell and back pressures, solenoid valves and transducers
• Transmits data and information between the software and all the active components
• Calibration data of connected transducers are saved in the fi rmware of the units
• Four different versions are available to offer maximum flexibility
• Can be stacked vertically reducing the footprint on the work bench
• The modular design concept allows easy extension of the system

• Analogue/digital converter: 16-bit
• Additional transducer gain ranges: +/- 20 mV and +/-10 V
• Ethernet connection to PC: 100 Mb
• Dimensions: WFD1A2 or WFD0A3: W 330 x D 240 x H 144 mm, WFD0A1 or WFD0A1/UNS W 330 x D 240 x H 70mm
• Weight: 6 kg (29-WFD1A2/29-WFD0A3) 4 kg (29-WFD1A1/29-WFD0A1/UNS)
• Power supply: 110-240 V 50/60 Hz, 1ph

A Master unit is always required, whatever combination of systems you want to put together. It has four active control channels for connecting the transducers that are needed for feedback to the software (for controlling vertical load or displacement and cell and back pressure) and eight passive channels for connecting a pore pressure transducer plus any other additional transducers, including local strain measuring devices. The Tritech compression frame, Hydromatic 2 pressure/ volume controllers and solenoid valves (for opening and closing the pressure lines) also connect to the unit. One Master unit is all that is needed for a single standard effective stress system.
Connections:

• 2 Hydromatic pressure/volume controllers
• 1 Tritech compression frame
• 12 transducers
• 2 solenoid valves

Used in addition to a Master unit, this extension unit provides control for one extra pressure system, with connections for a pressure transducer, solenoid valve and Hydromatic 2 pressure/volume controller, plus three spare passive transducer channels. It could be used, for example, in a system running permeability tests where three controlled pressures are required.
Connections:

• 1 Hydromatic pressure/volume controller
• 4 transducers
• 1 solenoid valve

• 3 Hydromatic pressure/volume controllers
• 12 transducers
• 3 solenoid valves

Used in addition to a Master unit, this extension unit provides control for one air pressure system, with connections for a pressure transducer, solenoid valve and Servoflow Air pressure controller. There is also a connection for an Automatic Volume Change device to measure the change in cell volume, plus two spare passive transducer channels.
Connections:

• 1 Servoflow
• 4 transducers
• 1 solenoid valve
• 1 Automatic Volume Change device