The pressure gauge should be installed where exposure to heat, vibration and moisture are minimal and where the dial can be easily read. Stem and flush mounted rear connected gauges are available options.

Isolating Devices

A shut-off valve such as a needle valve or gauge cock should be installed between the gauge and the process in order to be able to isolate the gauge for inspection or replacement without shutting down the process. The use of such devices are critical in times where start up pressures may temporarily exceed normal operating pressure. All isolating devices shall be opened slowly to prevent “slamming” of the bourdon tube. Care not taken during this time may damage the instrument.

Isolating Devices

Overload Protection

An overload protector should be used in situations where the process media may spike or be susceptible to overpressure of the design range for the gauge. This will prevent damage to the instrument.

Threaded Connections

The tightening or loosening of gauge connections can be done using the wrench flats on the gauge fitting. Using the gauge case to tighten or loosen pressure gauges will damage the gauge and may cause unrepairable damage to the instrument. Proper sealant tape or paste should be used for sealing tapered threads like National Pipe Thread (NPT)

Vibration/Pulsation Protection

If the pressure gauge is exposed to vibration or pulsating pressure or both, a liquid filled pressure gauge is recommended. The liquid dampens the effects of vibration making the pointer easier to read. Pressure dampeners, snubbers and or restrictor screws may be used to reduce pulsation. In extreme cases, a remotely mounted liquid filled gauge connected with a length of capillary line may be used.

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