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Pirani probe, opened. The Pirani gauge is a robust thermal conductivity gauge used for the measurement of the pressures in vacuum systems. [1] It was invented in 1906 by Marcello Pirani. [2] Marcello Stefano Pirani was a German physicist working for Siemens & Halske which was involved in the vacuum lamp industry.
1906 — Marcello Pirani – Pirani gauge (to measure pressures in vacuum systems) 1915 — J.C. Stevens — Chart recorder (first chart recorder for environmental monitoring) 1924 — Irving Langmuir — Langmuir probe (to measure plasma parameters) 1930 — Samuel Ruben invented the thermistor
Marcello Stefano Pirani (July 1, 1880 – January 11, 1968) was a German physicist known for his invention of the Pirani vacuum gauge, a vacuum gauge based on the principle of heat loss measurement. Throughout his career, he worked on advancing lighting technology and pioneered work on the physics of gas discharge.
A common variant is the Pirani gauge, which uses a single platinum filament as both the heated element and RTD. These gauges are accurate from 10 −3 Torr to 10 Torr, but their calibration is sensitive to the chemical composition of the gases being measured.
Taran Killam, Ana Gasteyer, John Mulaney, Kristen Wiig, Kenan Thompson, Paul Davidson, Maya Rudolph, Will Forte, and Jason Sudeikis perform during the "SNL50" live special.
A McLeod gauge is a scientific instrument used to measure very low pressures, down to 10 −6 Torr (0.133 mPa). It was invented in 1874 by Herbert McLeod (1841–1923). [ 1 ] McLeod gauges were once commonly found attached to equipment that operates under vacuum , such as a lyophilizer .
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