Patent ID: 7559245
Filing Date: 2009-07-14
Classification: F25B,G01L

Abstract:
1. A vacuum gauge for use in association with a refrigeration system, the gauge comprising: a) a scale having at least one pressure zone indicia selected from a group of zone indicia consisting of a safe zone indicia representing a range of pressure after which non-condensables have been effectively removed such that it is safe to charge the refrigeration system with refrigerant, and a working zone indicia representing a range of pressure within which water is being rapidly boiled off, b) an indicator to indicate a particular location on the scale, and c) a pressure sensing mechanism and housing having a pressure sensing port accessible for fluid connection to the refrigeration system to receive fluid for sensing, the pressure sensing mechanism and housing sensing pressure at the pressure sensing port and causing the indicator to move in accordance with sensed pressure at the pressure sensing port.