Question
Download Solution PDFThe working principle of Pirani gauge is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFPirani gauge:
- It is based on a hot metal wire suspended in a tube that is exposed to gas pressure media.
- The Pirani gauge measures the vaccum pressure dependent thermal conductivity from the heated wire to the surrounding gas.
- The heated Pirani sensor filament is typically made of a thin (< 20 μm) Tungsten, Nickel or Platinum wire
- As gas molecules collide with the Filament wire, heat is transported from the hot wire.
- The heat loss is a function of the gas pressure and at low pressure the low gas density and long mean free path between gas molecules provides low thermal conductivity.
- At high pressure the high gas density and short mean free path between molecules will result in high thermal conductivity.
Last updated on Jul 1, 2025
-> SSC JE Electrical 2025 Notification is released on June 30 for the post of Junior Engineer Electrical, Civil & Mechanical.
-> There are a total 1340 No of vacancies have been announced. Categtory wise vacancy distribution will be announced later.
-> Applicants can fill out the SSC JE application form 2025 for Electrical Engineering from June 30 to July 21.
-> SSC JE EE 2025 paper 1 exam will be conducted from October 27 to 31.
-> Candidates with a degree/diploma in engineering are eligible for this post.
-> The selection process includes Paper I and Paper II online exams, followed by document verification.
-> Prepare for the exam using SSC JE EE Previous Year Papers.