To use the heat radiation of the sun efficiently and to reach high temperatures eventually (e.g. to heat houses or run turbines), an insulation is needed that is IR radiation transparent, efficient and long-term stable (does not degrade over time at high temperatures and under UV radiation). Glass in combination with insulation vacuum is a perfect fit that fulfils these needs. The same issue as with Insulation vacuum for cryo applications, once the pumps are disconnected you have no direct measurement of insulation vacuum inside the tube any longer, whether the getter material gets quickly saturated (or not). e.g.  in case of outgassing or leakages.

As the SRG Technology works perfectly through glass, a glass tube with the ball can be welded to the glass vacuum chamber, thus one can measure the quality of the vacuum over time during the manufacturing process. It´s optional whether the tube stays connected for the lifetime of the collector, can be used for service, OR will be removed after manufacturing and initial tests to simplify the system. As the sensor is simple and cost effective, it does not drive costs up; in this application the “no change, constant value over time” is the only parameter that may count…

No need to open the sealed vacuum chamberIdeal for monitoring sealed vacuum systems
Easy to connect to port
No electrical feedthroughsChamber remains sealed
Electromagnetic/Mechanical measurementDoes not affect pressure or gas composition
Insensitive to vacuum process and temperature conditions
All-metal Sensor (in metal or glass tube)Contactless measurement provides long-term stability
High accuracy direct vacuum measurement
No component to fail or replace
Cost effective Sensor concept
Glass sensor tube maybe removed and be disposed of before shipment
Removeable Sensor head/readoutElectronics remain protected
Measurement and mounting on demand
One head for multiple sensors
Heads are universal, fit all sensors
High intrinsic accuracy/reproducibilityNo adjustments: Sufficient accuracy for most applications
Long term stability for years
No electronics remain after measurementCorrosion and “outdoor” weather resistant
One-button operationNo special training or specialist needed
Protection cap and magnet for storageNo breakage risk or damage of the ball's surface
Remote PC controlUser friendly
Serviceable sensorQuick and easy to clean and reassemble
Single connection to multiple units via RS-485 interfaceSimultaneously monitors multiple vacuum chambers