Liquid Filled Pressure Gauges

$ 27.00$ 34.00

Liquid-filled pressure gauges are essential instruments for accurately measuring pressure in industrial processes. These gauges are filled with a specialized liquid like glycerin or silicone oil to dampen vibrations, provide lubrication, and enhance the gauge’s reliability. They are available in units like psi, bar, kPa, and MPa to suit different measurement needs. Featuring MNPT (Male National Pipe Thread) connection ends, they ensure secure attachment to piping systems for precise pressure readings. The liquid fill plays a vital role in stabilizing the gauge’s pointer, offering consistent and accurate pressure measurements over time. By absorbing vibrations, protecting against environmental factors, and providing temperature compensation, liquid-filled pressure gauges ensure reliable performance and extended durability in challenging industrial environments.


Liquid-filled pressure gauges are essential tools used to accurately measure and display pressure levels in industrial processes. These gauges are filled with a specialized liquid, typically glycerin or silicone oil, to dampen vibrations and pulsations, provide lubrication, and enhance the gauge’s reliability and longevity in harsh operating conditions. The liquid fill helps stabilize the pointer, resulting in more consistent and accurate pressure readings over time.

Liquid-filled pressure gauges come in various units of measurement, including psi (pounds per square inch), bar, kPa (kilopascal), and MPa (megapascal), among others. These units allow for the pressure to be displayed in different metrics, catering to specific application requirements and industry standards. The choice of measurement unit depends on factors such as the type of fluid being measured, the intended operating pressure range, and regional preferences or regulations.

MNPT (Male National Pipe Thread) connection ends are commonly found in liquid-filled pressure gauges, providing a threaded connection for secure attachment to female-threaded pipes or fittings. This type of connection offers ease of installation and ensures a leak-proof seal, making it suitable for a wide range of piping systems and applications. The MNPT connection end allows for quick and straightforward installation and removal of the pressure gauge when necessary for maintenance or calibration.

The significance of liquid-filled pressure gauges lies in their ability to provide accurate and reliable pressure readings in challenging environments. The liquid fill serves multiple important purposes that contribute to the gauge’s performance and longevity:

Vibration Dampening:  The liquid fill absorbs vibrations and pulsations, preventing pointer oscillations and inaccuracies in pressure readings caused by mechanical disturbances in the system.

Lubrication:  The liquid lubricates internal components of the gauge, reducing wear and friction, and ensuring smooth and consistent operation over time.

Protection Against Environmental Factors:  The liquid fill provides a barrier against external elements like dust, dirt, and moisture, protecting the internal components of the gauge and extending its lifespan.

Temperature Compensation:  The liquid fill helps regulate the temperature inside the gauge, compensating for temperature fluctuations that could affect pressure readings.

Extended Lifespan:  By reducing wear and tear on the internal components and providing additional protection, liquid-filled pressure gauges offer a longer lifespan and greater durability compared to dry gauges.

In conclusion, liquid-filled pressure gauges play a crucial role in accurately measuring and monitoring pressure levels in industrial processes.  Their use of specialized liquid fills provides numerous benefits, including vibration dampening, lubrication, environmental protection, temperature compensation, and extended lifespan.  With MNPT connection ends and multiple units of measurement available, liquid-filled pressure gauges offer versatility, reliability, and precision in a wide range of applications, making them indispensable tools for pressure measurement in demanding industrial environments.

Additional information

Weight .25 lbs
Dimensions 8 × 8 × 8 in

-30-0, 0-15, 0-30, 0-60, 0-100, 0-200

Size Face

2.5", 5"


Back of Gauge, Bottom of Gauge


Industrial, Sanitary



CaseAISI 304 SS
RingAISI 304 SS, Crimp-On, PFQ: OT 58 brass with restricted orifice (dual scale only) or AISI 316 SS with restrictor screw (dual scale only)
SocketPFQ-LF: Lead free brass with restricted orifice (dual scale only)
Connection 1/8”, 1/4” or 1/2” NPT standard with restricted orifice
Fill LiquidGlycerin, 1.5” (40mm), 2″ (50mm): Phosphor bronze C or coil shaped for brass socket SS C or coil shaped for 316 SS socket
Bourdon Tube2.5” (63mm), 4” (100mm): Phosphor bronze or lead free phosphor bronze C or coil shaped for brass socket, AISI 316 SS C or coil shaped for 316 SS socket
MovementOT 59 brass or SS
PointerAluminum, anodized black, Brass: Silver alloy,
Welding316SS: TIG
Over-Pressure Limit25% for pressures up to 1,450 psi (9,998 kPa)
15% for pressures over 1,450 psi (9,998 kPa)
Socket MaterialBuna N for two-piece internal socket seal
Fill PlugBuna N
Lens Ring GasketSilicone rubber
Working PressureMaximum 75% of full scale value
Ambient / Process TemperatureDry: -40°F to 200°F (-40°C to 93°C)
AccuracyGlycerin Filled: -4°F to 150°F (-20°C to 65°C)
Enclosure RatingIP65





SRS pressure gauges Specifications


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