The cold-valve controller regulates the helium flow at the output of the variable temperature insert of our cryostats It is built from industrial components. The automatic regulation, manual operation and PID parameters  are easily managed with a process controller (Eurotherm model 3504).

Intuitive interface

The unit displays permanently the helium pressure in mbar and the output power in %. Bar graphs are permanently displayed to facilitate the operation.

Easy settings

The controller is programmed in a very few steps:

• enter the Settings mode
  
• enter the two boundaries delimiting the 3 PID zones
  
• enter the PID parameters for each of the 3 zones
  
• quit the Settings mode

Full remote control

Computer control via RS-485 and Ethernet is available. All parameters can be read and set, even the different sets of PID parameters. The communications are based on the Modbus communications protocol which has become a de facto standard in industry. We provide a Modbus XOP and a Procedure for controlling the level monitor with Igor Pro.