Mainly there are three types of gauge protectors:
• Pulsation protection and vibration protection. • Temperature protection. • Chemical protection.
• PULSATION AND VIBRATION PROTECTION
The area surrounding the bourdon tube is filled with transparent Liquid, normally glycerin. This protects the internal mechanisms against damage from vibration. This also damps the movement of the pointer from small transient fluctuations.
Pressure gauge snubbers are used to protect the pressure gauge from the effects of pulsating pressure. Porous snubbers are the most common type. Adjustable snubbers are provided with an adjustable needle valve that enables the operator to restrict the flow as operating conditions may demand even when the snubber is in service. Pressure gauge snubbers are effective for applications with pressure above 5 psi.
• TEMPERATURE PROTECTION
• CHEMICAL PROTECTION
DIAPHRAGM SEALED PRESSURE GAUGE