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Instruction Manual

For more than 30 years, we develop electronics that optimize and simplify the use of our equipment. We present the most advanced instruments to monitor liquid cryogens and control cold-valves, furnaces, pressure cells...

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High Pressures

Instruction Manual

Procedure for starting the controller:

  1. Put the crate on a flat floor, the nearest to the high-pressure cell or press.
  2. Unroll entirely the electric extension available at the back and plug it to 380V. Check that the "Plugged In" light is on.
  3. Unroll the pipe of compressed-air and plug it to the line available on the instrument. Check that the pressure is above 6 bar (required to ensure a smooth operation of the crate). If necessary, open the valve on the compressed air line.
  4. Close the manual valves "Buffer Relief Valve", "Helium Relief Valve", "Compressed Air Relief Valve" and "Sample Cell".
  5. Switch on the crate by actuating the "Power" button and wait until the controller is ready.
  6. Open the bottle of helium located at the back of the crate and tune the pressure reducer to about 50 bar.
  7. Check that the limits of the pressure gauges (red arrows) are set to 5.5 bar (compressed air), 100 bar (helium) and 2100 bar (sample cell). It is absolutely forbidden to change that settings.
  8. The pressure gauges indicate the actual pressures: about 6 bar for the compressed air line and 100 bar for the helium line.
  9. With the pressure reducer of the bottle of helium, tune the pressure gauge of the control panel (synoptic) to 150 bar.
  10. Press the "Fault Acknowledgment" button twice for switching off the "Helium Fault" and "Compressor Fault" lights.
  11. If there is no default, the red lights are switched off and the pressure controller is ready.
  12. If necessary, to flush the helium line, open the "Sample Cell" valve, enter a setpoint of about 2 bar on the Eurotherm and wait until helium flows out of the capillary, enter a setpoint of 0 and close the valve.
  13. Plug the capillary to the high-pressure cell or press, open the "Sample Cell" valve.

Procedure for using the controller:

With the arrow keys of the Eurotherm controller, enter the requested pressure. Once the "Sample Setpoint" is indicated on the display, the compressor starts. After a few minutes, if there is no leak, the pressure is regulated around the setpoint value. Here is the time expected to get to pressure:

  • about 3 minutes to reach 500 bar (50 MPa)
  • about 5 minutes to reach 1000 bar (100 MPa)
  • about 20 minutes to precisely stabilize the pressure at 2000 bar (200 MPa)

For increasing or decreasing the pressure on the sample, modify the "Sample Setpoint" value with the arrow keys on the Eurotherm.

Procedure for changing the helium bottle

For exchanging the helium bottle while the controller is in operation:

  1. Close the helium bottle.
  2. Open and close the pressure reducer of the bottle to purge the gas, until 0 bar.
  3. Dismount the pressure reducer and extract the bottle from the platform of the crate.
  4. Mount and attach the new bottle on the platform of the crate.
  5. Screw the pressure reducer by hand (without tool).
  6. Open the bottle and tune the pressure regulator so that 150 bar is indicated on the control panel (synoptic).

Procedure for stopping the controller and disconnecting the cell or press:

For releasing the pressure, enter a "Sample Setpoint" of 0.00 with the arrow keys on the Eurotherm and wait. It takes about 35 minutes when starting from 100 MPa (1000 bar) when the temperature is high enough to truly release the pressure in the cell. If the temperature is too low, one must warm up the cell so as to follow the solidification curve of He.

Once the pressure at about 0:

  1. Close the helium bottle.
  2. Open slowly the "Buffer Relief Valve".
  3. Check that the pressure decreases to zero on the "Sample Cell" mechanical gauge before disconnecting the capillary.
  4. A big noise can be produced when the rack is switched off (relief of the compressed air line and helium buffer).

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