Pressure gauge for liquids and gases - has syphon bellows exposed to medium and connected to sensor by tube filled with liquid

摘要

The pressure gauge is intended for use in a device for continuous recording of measured values. The measurement medium is separated from the sensor (5) by a syphon bellows (2) in a metal case (1). Its outside is exposed to the tested medium while the bellows (2) inside is connected to the sensor (5) through a small hole (4) in the bellows and a connecting tube (3). These items are filled with a liquid which does not freeze under the conditions of use, typically glycerine. The sensor is pref. a Bourdon tube. The external pressure circuit may be filled with water or another liquid.