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Transcript of Refrigeration Gauges
• It is a tube closed at one end
• An internal cross section is elliptical
• With internal pressure variation the tube
bends or unbends
• An internal pressure increase causes
the cross section to become more
circular and the shape to straighten,
resulting in motion of the closed end of
the tube Δ
• A wide range of alloys can be used for
making Bourdon elements
• For measuring over-pressure as well as
• Measuring ranges:
– from (0 to 0,5) MPa to 2 000 MPa http://www.ra.danfoss.com/TechnicalInfo/Approvals/Files/RAPIDFiles/01/Asset/Pressure%20Gauge%20-%20Manometer-Ver/Pressure%20Gauge%20-%20Manometer-Ver.09.10.19-.02-2D-L.swf View the Danfoss flash animation here: Courtesy Snap-on tools Courtesy Snap-on tools longviewweb.com http://www.amprobe.com/manuals/ACT9500.pdf Long hoses Existing R22/134a gauges, manifolds and
charging hoses must not be used
with R410A. The safe working pressures are not high enough for R410A. The sizes of the fittings for R410A are larger: R410A - 5/16" R22/R134A - 1/4" R410A fittings, cylinders, pipes gauges and hoses have higher burst pressures, viot.us lexusaustralia.org 188.8.131.52 Fitting and removing refrigeration service gauges
Evidence shall show an understanding of techniques for working with refrigeration service gauges to an extent indicated by the following aspects: a) Risks of working with refrigerants and rotating equipments b) Types, applications and care of service gauges and hoses
c) Types, applications and care of refrigeration system access fittings. d) Procedures for use of service gauges with minimal loss of refrigerant, including: fitting, removing air, reading gauges, using pressure temperature scales/charts and removing. 14.1.12 Hoses, fittings and procedures used during service, installation and decommissioning must be those which minimise the loss of refrigerant. Australia and New Zealand refrigerant handling code of practice 2007 • Part 2 — Systems other than self-contained low charge systems ecampus.nmit.ac.nz