Servoflow air pressure controller ( for unsaturated soil test)
The Servoflow is an electro-pneumatic pressure controller that generates air pressures of up to 1000 kPa for one pressure line. Managed under closed-loop control by the Data acquisition and control unit that it is connected to, it consists of a chassis housing an electronic pressure regulator. The regulator reduces the supply air pressure to a regulated output which is directly proportional to an electrical input signal received from the control unit. In the AUTOTRIAX 2, the Servoflow is used to provide air pressure to the sample for unsaturated soils testing systems, based on the axis translation method.
Automatic Volume Change (for unsaturated test module only)
The device is used for unsaturated soils testing with the double wall triaxial cell to measure the volume change of the soil sample.
The design is based on the standard volume change device with integral solenoid valves that allow the flow direction and bypass functions to be controlled by the pressure extension unit - unsaturated. The device has a physical capacity of 100 cc but due to the automatic switching, it can measure volume change continuously. It is powered directly by the pressure extension unit - unsaturated and has LEDs on the front panel to show the flow status.