{"id":569,"date":"2016-11-25T21:55:51","date_gmt":"2016-11-25T19:55:51","guid":{"rendered":"http:\/\/www.inst-sim.com\/1\/?p=569"},"modified":"2017-07-22T16:46:44","modified_gmt":"2017-07-22T14:46:44","slug":"press_thermal_gauge03","status":"publish","type":"post","link":"https:\/\/www.inst-sim.com\/1\/pressure\/press_thermal_gauge03\/","title":{"rendered":"\u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge"},"content":{"rendered":"\n\n\n
\u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge<\/span> \u0647\u0648 \u062c\u0647\u0627\u0632 \u064a\u0633\u062a\u062e\u062f\u0645 \u0644\u0642\u064a\u0627\u0633 \u0636\u063a\u0637 \u0641\u0631\u0627\u063a \u0645\u0646\u062e\u0641\u0636 Low Vacuum<\/span> \u0641\u064a \u0646\u0637\u0627\u0642 \u0627\u0644\u0636\u063a\u0637 \u0645\u0646 0.5 \u062a\u0648\u0631 \u0625\u0644\u0649 10-4 \u062a\u0648\u0631 Torr<\/span> .<\/td>\nPirani gauge is a device used to measure low vacuum in a pressure range from 0.5 Torr to 10\u22124 Torr.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"pirani-gauge2\"<\/p>\n

\u0634\u0643\u0644 \u0631\u0642\u0645 (1) : \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge<\/span><\/p>\n

 <\/p>\n

\u0645\u0643\u0648\u0646\u0627\u062a \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a \u0648\u0641\u0643\u0631\u0629 \u0639\u0645\u0644\u0647 Working Principle and Construction of Pirani Gauge<\/span><\/h3>\n

\"pirani-gauge2\"<\/p>\n

\u0634\u0643\u0644 \u0631\u0642\u0645 (2) : \u0642\u064a\u0627\u0633 \u0645\u0642\u0627\u0648\u0645\u0629 \u0641\u062a\u064a\u0644\u0629 \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge \u0628\u0642\u0646\u0637\u0631\u0629 \u0648\u064a\u062a\u0633\u062a\u0648\u0646<\/span><\/p>\n

*<\/p>\n\n\n\n
\n

\u064a\u062a\u0643\u0648\u0646 \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge<\/span> \u0645\u0646 \u0641\u062a\u064a\u0644\u062a\u064a \u062a\u0646\u062c\u0633\u062a\u0646 \u060c \u0648\u0645\u0635\u062f\u0631 \u062a\u063a\u0630\u064a\u0629 \u0643\u0647\u0631\u0628\u064a\u0629 \u0648\u0641\u0648\u0644\u062a\u0645\u064a\u062a\u0631 \u0623\u0648 \u0623\u0645\u064a\u062a\u0631 . \u062a\u0648\u0636\u0648\u0639 \u0625\u062d\u062f\u064a \u0627\u0644\u0641\u062a\u064a\u0644\u062a\u064a\u0646 \u062f\u0627\u062e\u0644 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u0645\u0642\u064a\u0627\u0633 Gauge Tube<\/span> \u0648\u062a\u062a\u0635\u0644 \u0628\u0627\u0644\u0648\u0639\u0627\u0621 \u0627\u0644\u0630\u064a \u0646\u0642\u0648\u0645 \u0628\u062a\u0641\u0631\u064a\u063a\u0647 \u060c \u0628\u064a\u0646\u0645\u0627 \u062a\u0648\u0636\u0639 \u0627\u0644\u062b\u0627\u0646\u064a\u0629 \u062f\u0627\u062e\u0644 \u0623\u0646\u0628\u0648\u0628 \u0645\u0631\u062c\u0639\u064a Reference Tube<\/span> \u0645\u062d\u0643\u0645 \u0627\u0644\u063a\u0644\u0642 \u0645\u0645\u0644\u0648\u0621 \u0628\u063a\u0627\u0632 \u0630\u0648 \u0636\u063a\u0637 \u062b\u0627\u0628\u062a . \u064a\u062a\u0645 \u062a\u0633\u062e\u064a\u0646 \u0627\u0644\u0641\u062a\u064a\u0644\u062a\u064a\u0646 \u0628\u062a\u064a\u0627\u0631 \u0643\u0647\u0631\u0628\u0627\u0626\u064a \u0636\u0639\u064a\u0641 \u064a\u0645\u0631 \u0645\u0646 \u062e\u0644\u0627\u0644\u0647\u0645 \u0644\u0627 \u064a\u0624\u062f\u064a \u0625\u0644\u0649 \u062a\u0648\u0647\u062c\u0647\u0645 . \u0627\u062d\u062a\u0643\u0627\u0643 \u062c\u0632\u064a\u0626\u0627\u062a \u0627\u0644\u0647\u0648\u0627\u0621 \u062d\u0648\u0644 \u0627\u0644\u0641\u062a\u064a\u0644\u0629 \u064a\u0634\u062a\u062a \u062d\u0631\u0627\u0631\u062a\u0647\u0627 , \u0648\u0643\u0644\u0645\u0627 \u0627\u0631\u062a\u0641\u0639 \u0627\u0644\u0636\u063a\u0637 \u0632\u0627\u062f \u0627\u062d\u062a\u0643\u0627\u0643 \u062c\u0632\u064a\u0626\u0627\u062a \u0627\u0644\u063a\u0627\u0632 \u0645\u0639 \u0627\u0644\u0641\u062a\u064a\u0644\u0629 \u0648\u0628\u0627\u0644\u062a\u0627\u0644\u064a \u064a\u0632\u062f\u0627\u062f \u0645\u0639\u062f\u0644 \u062a\u0634\u062a\u062a \u0627\u0644\u062d\u0631\u0627\u0631\u0629 \u0645\u0646 \u0627\u0644\u0641\u062a\u064a\u0644\u0629 . \u0648\u0643\u0644\u0645\u0627 \u0627\u0646\u062e\u0641\u0636 \u0627\u0644\u0636\u063a\u0637 \u0642\u0644 \u0639\u062f\u062f \u0647\u0630\u0647 \u0627\u0644\u062c\u0632\u064a\u0626\u0627\u062a \u0648\u0628\u0642\u064a \u0627\u0644\u0633\u0644\u0643 \u0633\u0627\u062e\u0646\u0627\u064b .<\/p>\n

\u062a\u062a\u0623\u062b\u0631 \u0627\u0644\u0637\u0627\u0642\u0629 \u0627\u0644\u062d\u0631\u0627\u0631\u064a\u0629 \u0627\u0644\u0645\u0634\u062a\u062a\u0629 \u0628\u0642\u064a\u0645\u0629 \u0627\u0644\u0636\u063a\u0637 \u0648\u0643\u0630\u0644\u0643 \u062e\u0627\u0635\u064a\u0629 \u0627\u0644\u062a\u0648\u0635\u064a\u0644\u064a\u0629 \u0627\u0644\u062d\u0631\u0627\u0631\u064a\u0629 \u0644\u0644\u063a\u0627\u0632 \u0627\u0644\u0645\u062a\u0628\u0642\u064a .<\/p>\n

\u0648\u062a\u0639\u062a\u0645\u062f \u0627\u0644\u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0643\u0647\u0631\u0628\u064a\u0629 Electrical Resistance<\/span> \u0644\u0644\u0641\u062a\u064a\u0644\u0629 \u0639\u0644\u064a \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u062a\u0647\u0627 \u060c \u0648\u0628\u0627\u0644\u062a\u0627\u0644\u064a \u062a\u0639\u062a\u0645\u062f \u0627\u0644\u0645\u0642\u0627\u0648\u0645\u0629 \u0639\u0644\u064a \u0642\u064a\u0645\u0629 \u0627\u0644\u0636\u063a\u0637 Pressure<\/span> .<\/p>\n

\u064a\u062a\u0645 \u0642\u064a\u0627\u0633 \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0641\u062a\u064a\u0644\u0629 \u0628\u0642\u0627\u0646\u0648\u0646 \u0623\u0648\u0645 Ohms Law<\/span>\u00a0 \u0627\u0644\u062a\u0627\u0644\u064a \u060c \u0648\u064a\u0645\u0643\u0646 \u0641\u0639\u0644 \u0630\u0644\u0643 \u0628\u0637\u0631\u064a\u0642\u062a\u064a\u0646 .<\/p>\n

    \n
  • \u0625\u0645\u0627 \u0646\u062b\u0628\u062a \u0642\u064a\u0645\u0629 \u0627\u0644\u062a\u064a\u0627\u0631 \u0648\u0646\u0642\u064a\u0633 \u0627\u0644\u062c\u0647\u062f .<\/li>\n
  • \u0623\u0648 \u0646\u062b\u0628\u062a \u0627\u0644\u062c\u0647\u062f \u0648\u0646\u0642\u064a\u0633 \u0627\u0644\u062a\u064a\u0627\u0631 .<\/li>\n<\/ul>\n

     <\/p>\n

    \u0642\u0627\u0646\u0648\u0646 \u0623\u0648\u0645 V=I\/R<\/span><\/td>\n

\n

Pirani gauge consist of two tungsten filaments, a power source and a volt meter or ammeter. One of the filaments is placed to gauge tube and is exposed to the environment where the pressure is measured. The other filament is placed in sealed reference tube filled with gas constant pressure. The filaments are heated up by passing current through them. As the gas molecules interact with the filament heat is carried away. The higher the pressure the more interaction with gas molecules and more heat is taken from the filament.<\/p>\n

Thermal energy dissipation is affected by the pressure and thermal conductivity characteristics of the residual gas.<\/p>\n

\u00a0The electrical resistance of the filament depends on the filaments temperature. Therefor the filaments electrical resistance depends on the pressure in the chamber.<\/p>\n

The electrical resistance is measured by following the ohms law. It can be done in two ways.<\/p>\n

Either keep the current constant and measure voltage or keep voltage constant and measure the current.<\/p>\n

V=I\/R – Ohms Law<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"pirani-gauge3\"<\/p>\n

\u0634\u0643\u0644 \u0631\u0642\u0645 (3) : \u0642\u0646\u0637\u0631\u0629 \u0648\u064a\u062a\u0633\u062a\u0648\u0646\u00a0Wheatstone Bridge Circuit \u0627\u0644\u0645\u0633\u062a\u062e\u062f\u0645\u0629<\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u0634\u0643\u0644 \u0631\u0642\u0645 (4) : \u0635\u0648\u0631\u0629 \u0645\u062a\u062d\u0631\u0643\u0629 \u062a\u0628\u064a\u0646 \u0641\u0643\u0631\u0629 \u0639\u0645\u0644 \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a<\/span><\/p>\n

\u0648\u0644\u0645\u0627 \u0643\u0627\u0646\u062a \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0633\u0644\u0643 \u062a\u062a\u0628\u0639 \u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u062a\u0647 \u0648\u062a\u0632\u062f\u0627\u062f \u0628\u0627\u0632\u062f\u064a\u0627\u062f\u0647\u0627 \u0641\u0625\u0646 \u0642\u064a\u0627\u0633 \u0645\u0642\u0627\u0648\u0645\u062a\u0647 \u0628\u0642\u0646\u0637\u0631\u0629 \u0643\u0647\u0631\u0628\u0627\u0626\u064a\u0629 \u0643\u0642\u0646\u0637\u0631\u0629 \u0648\u064a\u062a\u0633\u062a\u0648\u0646\u00a0Wheatstone Bridge Circuit<\/span> \u064a\u062f\u0644 \u0639\u0644\u0649 \u0645\u062f\u0649 \u062a\u0639\u0631\u0636 \u0627\u0644\u0633\u0644\u0643 \u0644\u0627\u0646\u062a\u0632\u0627\u0639 \u0627\u0644\u062d\u0631\u0627\u0631\u0629 \u0645\u0646\u0647 \u0623\u0648 \u0627\u0646\u0639\u062f\u0627\u0645 \u0630\u0644\u0643\u060c \u0648\u064a\u062a\u0645 \u0639\u0627\u062f\u0629 \u062a\u062f\u0631\u064a\u062c \u0647\u0630\u0627 \u0627\u0644\u0645\u0642\u064a\u0627\u0633 \u0628\u062f\u0644\u0627\u0644\u0629 \u0645\u0642\u064a\u0627\u0633 \u0622\u062e\u0631 \u0644\u0644\u0636\u063a\u0637\u060c \u0645\u062b\u0644 \u0645\u0642\u064a\u0627\u0633 \u0645\u0627\u0643\u0644\u0648\u064a\u062f \u0627\u0644\u0630\u064a \u064a\u0639\u062a\u0645\u062f \u0639\u0644\u0649 \u0627\u0631\u062a\u0641\u0627\u0639 \u0639\u0645\u0648\u062f \u0627\u0644\u0632\u0626\u0628\u0642 \u0645\u0642\u064a\u0633\u0627\u064b \u0628\u0627\u0644\u0645\u064a\u0644\u0645\u062a\u0631\u0627\u062a\u060c \u064a\u0628\u064a\u0646 \u0627\u0644\u0634\u0643\u0644 \u0642\u0646\u0637\u0631\u0629 \u0648\u064a\u062a\u0633\u062a\u0648\u0646\u00a0Wheatstone Bridg<\/span>e \u0648\u0642\u062f \u0631\u0643\u0628 \u0641\u064a \u0623\u062d\u062f \u0623\u0630\u0631\u0639\u0647 \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a \u0648\u0641\u064a \u0630\u0631\u0627\u0639 \u0622\u062e\u0631 \u0633\u0644\u0643 \u0645\u0643\u0627\u0641\u0626 \u0644\u0644\u0645\u0642\u0627\u0631\u0646\u0629.<\/p>\n

*<\/p>\n

\u062a\u0637\u0628\u064a\u0642\u0627\u062a \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Application of Pirani Gauge<\/span><\/h3>\n

\u0642\u064a\u0627\u0633 \u0636\u063a\u0637 \u0627\u0644\u062a\u0641\u0631\u064a\u063a \u0644\u0627\u0645\u0646\u062e\u0641\u0636 Low Vacuum Pressure measurement<\/span> .<\/p>\n

 <\/p>\n

\u0645\u0645\u064a\u0632\u0627\u062a \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Advantages of Pirani Gauge<\/span><\/h3>\n\n\n\n
\n

\u0639\u0627\u062f\u0629 \u0645\u0627 \u064a\u0641\u0636\u0644 \u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0645\u0642\u064a\u0627\u0633 \u0628\u064a\u0631\u0627\u0646\u064a Pirani Gauge<\/span> \u0639\u0646 \u0645\u0642\u064a\u0627\u0633 \u0627\u0644\u0645\u0632\u062f\u0648\u062c \u0627\u0644\u062d\u0631\u0627\u0631\u064a Thermocouple Gauge<\/span> \u0644\u0623\u0646\u0647 \u0623\u0633\u0631\u0639 \u0628\u0645\u0642\u062f\u0627\u0631 10 \u0645\u0631\u0627\u062a \u0648\u0645\u062f\u064a \u0627\u0644\u0642\u064a\u0627\u0633 Range<\/span> \u0644\u0644\u0636\u063a\u0637 \u0643\u0628\u064a\u0631 .<\/p>\n

    \n
  • \u0631\u062e\u064a\u0635 Inexpensive<\/span> .<\/li>\n
  • \u0645\u062a\u064a\u0646 Rugged<\/span> .<\/li>\n
  • \u0627\u0633\u062a\u062c\u0627\u0628\u0629 \u062c\u064a\u062f\u0629 Response<\/span> \u0644\u0644\u062a\u063a\u064a\u0631 \u0641\u064a \u0627\u0644\u0636\u063a\u0637 .<\/li>\n
  • \u0627\u0644\u0639\u0644\u0627\u0642\u0629 \u062e\u0637\u064a\u0629 \u0628\u064a\u0646 \u0627\u0644\u0645\u0642\u0627\u0648\u0645\u0629 \u0648\u0627\u0644\u0636\u063a\u0637 \u0641\u064a \u0627\u0644\u0645\u062f\u064a \u0627\u0644\u0645\u0633\u062a\u062e\u062f\u0645 .<\/li>\n
  • \u064a\u0645\u0643\u0646 \u0623\u062e\u0630 \u0627\u0644\u0642\u0631\u0627\u0621\u0629 \u0639\u0646 \u0628\u0639\u062f Remotely<\/span> .<\/li>\n<\/ul>\n<\/td>\n
\n

Pirani gauge is often preferred over thermocouple gauge because it is 10 times faster and wider range of pressure can be measured.<\/p>\n