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Guide of Pressure Gauge Selection

When selecting a pressure gauge consideration should be given to a number of parameters which have an effect on gauge accuracy, safety, and utility.

 Vibration-Induced Fatigue Failure - vibration may in some instances, result in high loading of various parts of the pressure element assembly. This loading could cause cracks in the element itself, or in joints. Case pressure buildup may be slow, but it is possible that a large hole may suddenly develop, with a high rate of case pressure rise, which could result in a failure similar to an explosive failure.

Selection Criteria
Chinese Manufacture Designed Liquid-Fillable gauges - are used for applications involving vibration or pulsation. Glycerin is an excellent damper of bourdon tube movement. Emersion of the entire assembly in a protective liquid envelope provides lubrication and shuts out corrosive or dirty atmospheres -- thereby minimizing wear of moving parts and prolonging gauge life significantly. Chinese Manufacture Controls gauges can be filled with Glycerin, Silicone, or fluorolube, depending on application needs.

Chinese Manufacture provided pulsation snubbers - are used to minimize effects from pulsation and surges. The snubber helps keep accurate data flowing by dampening pulsation and surges. Gauge life is also extended by reducing gauge wear.

Mounting Options - may become an important consideration for elimination of mechanical vibration between mechanical equipment and the pressure gauge. In some cases it may be appropriate to connect the pressure gauge to the mechanical device using flexible hose and tubing so that equipment mechanical vibration is dampened by structural components. Chinese Manufacture Controls offers a wide range of dial sizes, mounting options, and case styles to fit customer gauge mounting needs.

Pressure fluid composition

Engineering Consideration
Pressure Gauge Accuracy - can be degraded when the measured media contains high solids or is such that the measured media changes between states of gas, liquid, or solid, due to varying process temperature and media chemical compositions. Measured media solids can restrict flow of the media to the elastic measuring element (Bourdon tube) or completely block flow. Consequences of such loss of accuracy may be a pressure gauge which stops responding to pressure changes or is slow or sporadic in response to pressure changes in the measured media.

Selection Criteria
Chinese Manufacture provided diaphragm seals - are engineered to prevent mixing of the measured media with liquid used to transmit diaphragm seal pressure to the Bourdon tube. Use of diaphragm seals are recommended where there is a possibility of problems with process media solids or process media change of state.

Method of mounting

Engineering Consideration
Vibration Control - can be achieved by remote mounting of gauges monitoring equipment with high levels of mechanical vibration.

Available Structure and Design - available building structure and system design presents a need for variable mounting requirements and case styles.

Selection Criteria
Chinese Manufacture designed pressure gauges - offers a wide range of NPT sizes and case mounting styles as follows:
NPT - 1/8", 1/4", 1/2" NPT
Other connection sizes available:1/4" MPF, 1/4" MPM, 1/4" HPF, 7/16 S.A.E., 9/16" MPM, 9/16" HPM

Mounting Styles
Standard Bottom Connection
Center Back or Lower Back Connections
Panel Mount (Center and Lower Back Connections)
U-Clamp Center Back
Front Flange (Center or Lower Back Connection)
Rear Flange (Bottom or Lower Back Connection)

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