1 GPa Liquid Pressure Regulators

The 1 GPa Liquid Pressure Regulators supply continuously loaded high-pressure cells with a mixture of Glycerol/H2O up to 1 GPa (10 kbar). The pressure transmitting media is chosen according to the situation (Glycerol-D8/D20 or FC-770 Fluorinert for example). Each system, built by SITEC, consists of a primary pump used for pre-filling the system up to a maximum pressure of about 70 MPa and for driving the pressure intensifier. The control loops and the different modes of control operation are performed by a Schneider M251 PLC. The graphical user interface is programmed on a touched screen Exor HMI.

The pressure generation system is designed for controlled pressurisation and depressurisation. The pressure intensifier piston position is measured and indicated. If the piston has reached the upper end position, the automatic re-filling procedure is activated. In standard operation, NOMAD communicates via an Ethernet interface (Modbus TCP/IP) with the PLC. A list of the relevant PLC registers is provided below.

The compressor, pressure intensifier, valves, controller and related electronics are packed in a crate that is easily moved to the instruments. It also features two rollers of cables (230V and compressed air). The Glycerol/H2O level in the tank is measured and indicated.

At start, NOMAD writes the instrument name into a register and reads the maximum allowed pressure and ramp limits entered by the operator when connecting the ressure cell (limits imposed by the cell or lower limits wished by the user). When an optional temperature or pressure sensor is placed near the regulator, the reading can be read by NOMAD. When the regulator raises alarms or encounters defaults, NOMAD is informed with the register 50 046 and details are displayed on the HMI.