Explore our top-tier precision OEM pressure gauges, bimetal thermometers, and specialized monitors designed for extreme industrial applications.
An authoritative analysis of the physical mechanics, material elasticity, and kinetic linkage mechanisms that enable non-powered analog pressure measurement.
The Bourdon tube pressure gauge operates on the fundamental physical principle of elastic element deformation under pressure differentiation. Invented by Eugène Bourdon in 1849, the sensor element consists of a flattened, oval-cross-section metallic tube bent into a specific geometric shape (C-shape, helical, or spiral).
When pressurised fluid or gas enters the interior of the tube through the socket, the elliptical cross-section attempts to regain a circular geometry due to force distribution. This internal stress distribution forces the curved tube to uncoil or straighten out slightly at its sealed tip (the tip end).
Because the tip displacement ($\Delta s$) is extremely subtle (typically 1 mm to 3 mm), a precision movement system is required to convert this minute linear movement into a 270-degree radial pointer rotation:
Bent in an arc of approximately 250 degrees. Primarily used for low to medium pressure measurements (0.6 bar up to 60 bar / 10 PSI to 800 PSI). Offers robust stability and straightforward calibration.
Wound into several overlapping coils. Provides significantly greater tip movement per unit pressure. Essential for high-pressure applications (60 bar up to 1000+ bar / 10,000 PSI) with superior fatigue life.
Coiled flat in a single plane. Provides compact movement without high internal stress concentrations, making it ideal for low-pressure panel indicators requiring high precision.
Bourdon tube pressure gauges serve as primary mechanical fail-safe visual indicators across harsh industrial operational environments worldwide.
Used on cracking units, pipelines, and offshore rigs. Requires NACE MR0175 compliant 316L Stainless Steel or Monel 400 Bourdon tubes to resist H2S sulfide stress cracking in corrosive, high-vibration conditions.
Monitors ammonia, R134a, R410A refrigerant loops. Dual-scale pressure-temperature dials enable HVAC technicians to assess superheat and subcooling levels directly.
High-voltage circuit breakers rely on temperature-compensated SF6 gas density monitors with integrated bimetallic linkage to prevent arcing catastrophes in electrical substations.
| Bourdon Tube Alloy | Pressure Range | Media Compatibility | Corrosion Resistance | Typical Industry |
|---|---|---|---|---|
| Phosphor Bronze (C5191) | 0 to 600 bar | Air, Water, Non-aggressive Oil | Moderate (Standard) | HVAC, Compressors, General Plumbing |
| Stainless Steel 316L | 0 to 1600 bar | Aggressive Liquids, Gas, Mild Chemicals | High (Acid & Salt Resistant) | Petrochemical, Marine, Food & Beverage |
| Monel 400 Alloy | 0 to 1000 bar | Chlorine Gas, Hydrofluoric Acid, Sea Water | Ultra-High (Severe Chemical) | Offshore Mining, Marine Engineering |
| Hastelloy C276 | 0 to 700 bar | Concentrated Acids, Strong Oxidizers | Maximum (Extreme Process Media) | Pharmaceutical Reactors, Chemical Plants |
How Huzhou Accuracy Instrument Co., Ltd. leverages integrated industrial clusters, advanced automation, and strict ISO controls to supply global buyers with scalable, cost-competitive pressure gauges.
High-frequency automatic silver brazing and TIG robotic welding join the Bourdon tube to the socket, preventing micro-leak paths even under severe pulse fatigue cycles.
Automated optical vision systems capture non-linear deformation curve data and custom print dial faces to guarantee true Class 1.0 or Class 0.5 compliance across the scale.
Every tube undergoes controlled hyper-pressurization (up to 130% full-scale) to stabilize internal stress, preventing long-term drift or pointer zero-offset.
Automated vacuum-assisted glycerin or silicone filling lubricates movement parts and dampens mechanical vibration for severe pulsation environments.
Over 20 years of relentless research, precision engineering, and global export excellence in industrial mechanical pressure gauges and temperature sensors.
Huzhou Accuracy Instrument Co., Ltd. is professionally engaged in the development, sales, and service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometers, and pressure sensors. Products are widely used in various applications such as Mechanical Engineering, Chemical Engineering, Food Industry, Pharmaceutical, and high-technology electric appliances.
Established over two decades ago, our pressure gauge manufacturing facility spans 3,000 square meters, equipped with advanced production lines and rigorous quality control systems. As an industry leader, we integrate innovation with precision engineering to deliver reliable measurement solutions for global clients.
Our laboratory conducts 100% pressure cycle tests and environmental simulations, adhering strictly to ISO 9001 and ISO 17025 standards. Continuous improvement drives our reputation for "zero-leak" performance in extreme conditions, supported by a comprehensive one-year warranty.
We have long followed the concept of "reasonable price, accurate delivery, good quality" and several business management models to keep our production quality above the required benchmark under ISO9001:2008 certified.
Avoid common measurement errors by matching pressure range, accuracy class, fluid compatibility, and environmental factors during OEM procurement.
To maintain ISO 17025 compliance and prevent gauge drift, follow standard Deadweight Tester (DWT) calibration cycles every 12 months:
Answers to common technical, manufacturing, and international procurement queries curated by our engineering team.
A Bourdon tube pressure gauge works via the elastic deformation of a curved tube with an oval cross-section. As fluid pressure enters the tube, the cross-section attempts to become circular, causing the tube to uncoil. This movement is transferred via a linkage and sector gear assembly to rotate a pointer across a calibrated scale, showing accurate line pressure without needing electric power.
Liquid filling dampens pointer flutter caused by mechanical vibration or sudden pressure pulses, making the scale easier to read. The fluid also lubricates internal sector movement gears, prevents internal condensation, and extends gauge operational life in severe industrial environments.
Huzhou Accuracy Instrument provides custom tube and socket materials, including Phosphor Bronze (standard), 304 Stainless Steel, 316L Stainless Steel (corrosive media), and specialized alloys such as Monel 400 or Hastelloy C276. Cases can be specified in painted black steel, brass, or polished 304/316 SS.
Standard OEM prototype samples are delivered within 7–10 days. Full batch orders typically require 20–30 days depending on custom dial face printing and specific connection threads. MOQ depends on gauge configuration, ranging from 100 units for specialty items to 500 units for standard models.
Discover our comprehensive collection of mechanical pressure gauges, capillary remote thermometers, and micro-fused pressure transducers.
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