Gauge Spinning rotor

The spinning rotor gauge (SRG) technique [51], which is based on the measurement of the deceleration rate caused by gas friction on a freely spinning spherical metallic ball, is particularly well suited to monitor the pressure in sealed-off devices and has been proposed in the recent years also for vacuum panel applications [5, 40, 52, 53]. 

Figure 4.21 Diagram of the VIP mounting the spinning rotor gauge. Vacuum tightness is ensured by a high vacuum epoxy resin.

After the preparation, the panel was put in a oven and kept at the indicated temperature for 15 to 20 minutes. The panel was then removed and the total pressure measured as a function of time. To allow the continuous monitoring of the pressure, a SpiroTorr spinning rotor gauge was mounted in the panel as shown in Figure 4.21. 

Viscosity measurement (i.e. molecular drag) - e.g. spinning rotor gauge (SRG). 

Summary of literature data Spinning rotor fraction gauge Torsion mass loss effusion Static method ... 

Van Ekeren, P.J., Jacobs, M.H.G., Offringa, J.C.A., De Kruif, C.G. (1983) Vapour-pressure measurements on rnms-diphenylethenc and naphthalene using a spinning-rotor friction gauge. J. Chem. Thermodyn. 15, 409—417. 

Spinning rotor viscosity gauge a transfer standard for the laboratory or an accurate gauge for vacuum process control J. Vac. Sci. Technol., 20 (4), 1982,1148-1152... 

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