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1 GPa Liquid Pressure Regulators

The 1 GPa Liquid Pressure Regulators supply continuously loaded high-pressure cells with FC-770 Fluorinert up to 1 GPa (10 kbar). Each system, built by SITEC, consists of a primary pump used for pre-filling of 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 realised on a Eurotherm Mini8 PLC. The graphical user interface is programmed with LabView on a panel PC with touch screen.

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 instruments. It also features two rollers of cables (230V and compressed air). The Florinert level in the tank is measured and indicated. On the GUI, the mode of operation can be changed to manual mode. In this mode, a simple pressure ramp up or down can be started. That allows to test a pressure profile step by step.

DescriptionReadWriteAddress
Actual value PT1 (intensifier outlet)X 4228
Actual value PT2 (sample)X 4229
Actual value PT3 (intensifier inlet)X 4230
Actual pressure compressed airX 4231
Piston position (intensifier)X 4232
Filling level B1 (FC-770 Fluorinert level)X 4233
Mini8 readyX 4251
Output signal control valve compressed airX 4252
Output signal control valve (intensifier pressure relief)X 4253
Output signal control valve (sample pressure relief)X 4254
Emergency switchX 4869
Actual control phaseX 4962
Target set point (remote control)XX4963
Intensifier checkX 4964
Maximum pressureX 4965
Working set pointX 4966
Target set point (LabView)X 4968
Remote control activeX 4969
Set point ramp rateXX4970
Firmware version (Mini8)X 4971
Offset PT1 (intensifier outlet)X 4972
Offset PT2 (sample)X 4973
Offset PT3 (intensifier inlet)X 4974