Mcasuring of the Vacuity of Full Cans by the Elastic Deflexion of their Upper and Lower End Plates
III. Pneumatic Vacuum Tester
1936 Volume 5 Issue 4 Pages 255-261
Details
1936 Volume 5 Issue 4 Pages 255-261
In his previous report, the author has described the “Dial Vacuum Indicator” showing that the measurements by the instrument are fairly accurate and average deviations from those obtained by the Bourdon tube type vacuum tester ordinary used to-day are below 2.0 inches in vacuum.
Usage of the “Dial Vacuum Indicator” is very simple and accordingly the measuring is conducted very speedily, but it must be taken into consideration that with inceasing of occa-sions of using the wear of the mechanical gears of the indicator will become considerably large. In industrial usage it is desired that the accuracy of the measurement is to be higher and besides the wearing will be limited as small as possible.
The author has devised a new vacuum testing apparatus utilizing the pnenmatic micro-meter which is operated with no direct contact and releases us free from the care of wearing of mechanical gears.
Using this pneumatic apparatus the vacuity of pink-salmon 1 lb. cans circulated in market were measured and desirable results have been obtained.
The mean value of errors of the measured vacuities of all 48 cans tested by this apparatus was 31•1 mm (12•2 in) in vacuum and the consumption of air comparatively small as about 0•28m3/min (10ft3/min) at atmospheric pressure and as the apparatus was assured that it would be utilized industrially in general.
