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Applications and Future of Pressure Gauge
Published:2013-12-27 14:19:47    Text Size:【BIG】【MEDIUM】【SMALL
Once the calibrated gauge is assembled and packaged, it is distributed to equipment manufacturers, service companies, and testing laboratories for use in many different applications. These varied applications account for the wide range in design of the case and lens enclosure. The socket may enter the case from the back, top, bottom or side. Some dials are illuminated by the luminescent inks used to print the graduations or by tiny lamps connected to an outside electrical source. Gauges intended for high pressure service usually are of "dead front" safety design, a case design feature that places a substantial thickness of case material between the Bourdon tube and the dial. This barrier protects the instrument viewer from gauge fragments should the Bourdon tube rupture due to excess pressure. The internal case design directs these high velocity pieces out the back of the gauge, away from the viewer. Many applications involve mounting the gauge directly to the running machinery, resulting in the need for liquid filling. Unfilled gauges quickly succumb to the destructive effects of vibration. Special mounting flanges are secured to the cases to allow for panel and surface mounting independent of the pressure plumbing. Case and lens materials are chosen to cope with a variety of abusive or contaminated environments, and are sealed by various means to keep moisture and contaminants out of the movement mechanism.

The use of pressure gauges in the future appears to be dependant on the quickly growing electronic sensor industry. These sensors are electronic components that provide an electrical signal and have essentially no moving parts. Many gauges today already have these sensors mounted within the case to send information to process control computers and controllers. These sensors are intrinsically safe, allowing their use in flammable or explosive environments. The whole process control issue has grown in recent years as a result of the need to prevent accidental releases of the process media, many of which are harmful to the environment. As environmental concerns grow, this interface will be in demand and the mechanical gauge may fall out of favor. However, the mechanical gauge does not require the electrical power source or the computer equipment needed by the electronic sensor. That makes the gauge cost effective for most general uses, and it is in this area that industry expects to continue to thrive.
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