Pressure Gauge is measuring and indicating instrument without external power that shows the accurate process/fluid pressure by using the mechanical sensing elements like bellow, bourdon, or diaphragm type based on balance working principle.
Components
of Pressure Gauge
The main components of a pressure gauge are the dial, pointer, ring/lens gasket, window/glass lens, movement, sensing element, and case.
Case: It is generally known as housing keeps all other materials along with it. The case is made up of aluminum, steel, brass, polypropylene, stainless steel based on the applications and mounting environments. As per mounting style like surface mounting, flush-mounting, or pipeline mounting cases are back flange, front flange, and turret types.
Dial:
These are made up of steel, brass, aluminum, plastic, with black marking lines
on a white background or in other color combinations. Near major marking lines, the numerals are placed. Sometimes there are two rings of marking lines shown in
different units as per the requirement.
Pointer: Generally, it is a bar navigate to show the pressure value by indicating the numerals, fixed with the shaft. Industrial gauges are made with adjustable pointers which adjust by turning the hub while keeping the shaft fixed.
Ring / Lens Gasket: It keeps the window/glass lens fixed. Ring attached to the case in different ways, including snap, friction, slip, threaded, and hinged designs. The look of the gauge can also be affected by ring design variations, including peaked, flat-flared, and beaded gauges.
Window/Glass Lens: It is held against the case front by rings. Material of construction of the lens is available including shatterproof, beveled glass or cellulose acetate, and non-electrostatic plastics, etc.
Movement: The mechanism that connects the sensing element and the pointer to show the deflection is known as a movement in general. It situates in between the dial and the case and protects both (e.g. pinion and socket arrangement).
Sensing Element: Pressure gauges generally use mechanical pressure sensors as sensing elements and deflect the pointer using shaft movement or different types of mechanism arrangements.
To know more about the mechanical pressure sensing element, check the link below: Instrumentation Basics: Mechanical Pressure Sensor Basics I (instrumentbasics.blogspot.com)
Pressure gauge manufactured by considering safety standards which contain at least a blowdown disk that allows the internal pressure to escape. General process connections of pressure gauges are either 1/4in or 1/2in size located either on the back or on the bottom.
List of Prominent Manufacturers: Accutech, Ametek, Ashcroft, Barton Instruments, Bristol Babcock, Dresser Instrument, Druck, Dwyer Instruments, Endress+Hauser, Flow-Tech, TheFoxboro Co., Honeywell, Measurement Specialties, Moore Products, Mid-West Instrument, MKS Instrument, Nuova-Fima, OCI Instruments, Omega Engineering, Parker, Palmer Instruments, Phonetics, Smar International, TSI Inc., Trerice, Winters, Wika, Yokogawa
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