V O L U M E 2 4, N O . 2, F E B R U A R Y 1 9 5 2
New
35 A
Glass Model... it remembers your vacuum setting even after shutting down system
Here is truly an amaz ing instrument. So un canny in its operation, this new glass Cartesian Manostat #7 performs with human-like sensitivity. Formerly, new settings had to be made every time the sys tem was shut down. But now Cartesian Manostat #7 elimi nates that time-consuming operation. Now, once a vacuum has been set in the instrument, the system may be shut down without disturbing the setting. This new feature pro vides simple and fool-proof operation. This glass model is especially suitable for laboratory applications because of its corrosion resistance. HOW IT WORKS* The operation is based on sealing off a given amount of gas inside the diver at the control pressure. The sensitive diver responds to the slightest increase in pressure in the system which causes the diver to drop and open the upper orifice which is connected to a source of pressure lower than the control pressure. This allows the excess gas to leave the system and restore it to the control point. A small bleed into the system from a source of higher pressure insures that the pressure in the system will never go below the control pressure. When operated under vacuum, the quantity of gas main taining the control pressure is sealed inside the diver even when the system is restored to atmospheric pressure, since the excess pressure forces the inside seat of the diver down upon the orifice of the internal central tube and prevents breaking of the mercury seal. *For Theory of Operation See Following Article: Gilmont, R., Ind. Eng. Chem. Anal. Ed. IS. 633, (1946) ; 23, 1B7 (1951).
PRICE LIST: 615071 Cartesian Manostat #7, all glass model ready for use with rubber con nections. Clamps for pressure operation and mercury not included, ea. $39.50
The EMILGREINERCo. 2 0 - 2 6 Ν . M O O R E STREET
NEW YORK 13, Ν.Υ.
