Explore our flagship glass-to-metal sealed pressure transmitters and high-precision monitoring instruments engineered for global OEMs.
Understanding the molecular fusion technology that eliminates O-ring degradation, oil leaks, and thermal drift in modern pressure measurement.
In high-stress industrial environments—ranging from mobile hydraulic machinery and refrigeration compressors to subsea oil extraction and ultra-high-voltage SF6 switchgear—pressure transducers face extreme operational challenges. Traditional piezoresistive pressure transmitters rely heavily on organic adhesive bonding (such as epoxy resins) or elastomer O-ring seals (Viton, NBR, EPDM) to isolate electrical feedthroughs from corrosive process media. However, organic seals inevitably degrade under temperature cycling, high peak impulse pressure, aggressive synthetic oils, or volatile gases, leading to catastrophic seal failure, media outgassing, and sensor calibration shift.
As a leading Glass to Metal Seal Pressure Sensor Supplier & Factory, Huzhou Accuracy Instrument Co., Ltd solves these systemic vulnerabilities through advanced Glass Micro-Fused Silicon (GTMS) Technology. By replacing organic seals with high-temperature inorganic glass bonding, micro-fused silicon pressure sensors achieve complete hermetic sealing. In this process, micro-machined silicon strain gauges are fused at high temperatures (exceeding 700°C) onto a metallic diaphragm (typically 17-4PH stainless steel or 316L SS) using high-purity inorganic glass frit. The result is a monolithic sensor cavity with zero internal oil filling, zero organic adhesives, and an ultra-high burst pressure rating.
Inorganic glass-to-metal fusion forms an absolute molecular seal across conductive pins and stainless steel headers, guaranteeing leak rates under 1x10⁻⁹ mbar·l/s Helium standard.
Unlike oil-filled isolated piezoresistive sensors, GTMS technology transfers pressure directly through a solid stainless steel diaphragm, eliminating thermal expansion oil errors.
Capable of enduring over 10 million full pressure shock cycles without mechanical hysteresis, weld failure, or diaphragm deformation. High safety factors exceeding 500% FS burst pressure.
The global industrial sensing market is undergoing a seismic shift toward micro-fused silicon glass-to-metal sealed pressure sensors. As heavy equipment manufacturers, HVAC/R original equipment manufacturers, and green energy providers push for higher operating efficiency and maintenance-free service life, traditional ceramic capacitive and epoxy-bonded sensors are being systematically phased out.
Major demand vectors globally include:
| Technology Metric | Glass Micro-Fused (GTMS) | Oil-Filled Piezoresistive | Ceramic Capacitive |
|---|---|---|---|
| Hermetic Seal Type | Inorganic Glass Reflow | Welded Metal Diaphragm + Silicone Oil | Elastomer O-Ring (Viton/NBR) |
| Operating Temperature | -40°C to +150°C (Custom to 300°C) | -20°C to +85°C | -20°C to +100°C |
| Burst Pressure Margin | 5x to 10x Full Scale | 2x to 3x Full Scale | 2x Full Scale |
| Fluid Media Outgassing | Absolute Zero (No Oil Fill) | Risk of Oil Diaphragm Rupture | Risk of O-ring Degradation |
| Shock & Vibration | >100g Shock / 20g Vibration | Moderate Shock Tolerance | Brittle Ceramic Fractures |
| Long-Term Stability | < ±0.1% FS / Year | < ±0.25% FS / Year | < ±0.3% FS / Year |
Combining 20+ years of technical excellence with full-spectrum vertical integration to deliver high-precision sensing solutions globally.
Huzhou Accuracy Instrument Co., Ltd stands at the forefront of industrial instrumentation and micro-fused pressure sensor manufacturing in China. Operating out of a state-of-the-art 3,000 square meter facility, our plant integrates automated high-vacuum glass reflow furnaces, laser micro-welding stations, automated thermal compensation calibration systems, and cleanroom packaging facilities.
Our core operational efficiency stems from complete vertical integration. From raw metal header CNC machining, inorganic glass preform positioning, and silicon strain gauge micro-fusing to temperature calibration (-40°C to +125°C full-spectrum laser tuning) and final signal conditioning circuit design (0.5-4.5V ratiometric, 4-20mA, 0-10V, I2C/SPI), we control 100% of the manufacturing chain. This eliminates reliance on third-party sub-assemblies, drasticly reduces lead times, and allows highly competitive OEM volume pricing for international enterprise buyers.
Key Team Structure & Capacities:
Proven reliability engineered for the most demanding real-world industrial environments.
Installed directly into hydraulic pump blocks, braking systems, and boom lift cylinders. Withstands extreme cavitation water hammer effect up to 2,000 bar spike pressures without zero-shift or diaphragm rupture.
Compatible with natural refrigerants including R744 (CO2), Ammonia (R717), and R290 Propane. Glass seal integrity prevents gas migration into sensor ASIC electronics, extending service life beyond 15 years.
Combined with our SF6 gas density mechanical gauges, GTMS electronic transducers deliver high-accuracy digital tracking of sulfur hexafluoride pressure in modern high-voltage power switchgear and substations.
Designed with corrosion-resistant 316L SS or 17-4PH housing to monitor upstream oil/gas line pressure, hydraulic fracturing fluids, and mud pumps under extreme ambient heat and abrasive fluid flow.
Hermetic glass isolation ensures zero hydrogen permeation through internal seals. Specialized low-drift signal conditioning guarantees precise monitoring in high-pressure hydrogen dispense units up to 70 MPa.
Seamless integration into factory automation loops, pneumatic manifolds, water treatment pumps, and industrial boilers requiring continuous 4-20mA or 0-10V feedback signals.
Key technical parameters and custom OEM options to specify when sourcing GTMS pressure transducers.
When selecting a Glass to Metal Seal Pressure Sensor Supplier & Factory for large-scale OEM projects, procurement teams and instrumentation engineers must evaluate core technical specifications beyond basic pressure ranges. Below is our engineering selection matrix:
| Specification Parameter | Standard OEM Capability | High-Precision Custom Option |
|---|---|---|
| Pressure Ranges | 0...1 bar up to 0...600 bar (Gauge / Sealed Gauge) | 0...0.5 bar up to 0...2,200 bar (Absolute / Gauge / Vacuum) |
| Accuracy (NLH) | ±0.5% Full Scale (Best Fit Straight Line) | ±0.25% FS or ±0.1% FS High Precision Grade |
| Signal Output | 4-20 mA (2-wire), 0.5-4.5V Ratiometric, 0-10V | I2C, SPI Digital Output, RS485 Modbus, CANopen |
| Wetted Materials | 17-4PH Stainless Steel, 316L SS | Inconel 718, Hastelloy C-276, Monel K-500 |
| Pressure Connections | G1/4", 1/4" NPT Male, 7/16-20 UNF Female with Schrader Deflector | M12x1.5, G1/2" Flush Diaphragm, Custom Thread Specifications |
| Electrical Connectors | Packard Metri-Pack 150, M12x1 4-Pin, DIN EN 175301-803 (Form A/C) | Direct Shielded Cable Outlet (IP68/IP69K), Deutsch DT04-3P |
| Operating Temperature Range | -40°C to +125°C (-40°F to +257°F) | -50°C to +150°C (High temp version up to 300°C) |
| Proof & Burst Pressure | Proof: 200% FS | Burst: 500% FS | Proof: 300% FS | Burst: 1000% FS (Ultra-High Safety) |
Pioneering the next era of smart digital sensing, ultra-high temperature hermeticity, and green energy integration.
Future GTMS sensors integrate ultra-low-power ASICs directly inside the hermetic glass header. This enables real-time self-diagnostics, continuous thermal drift correction, and dynamic digital bus output (IO-Link, CANbus) for Industry 4.0 predictive maintenance.
Next-generation inorganic glass formulas engineered with coefficient of thermal expansion (CTE) matching alloys allow sensors to operate continuously at extreme temperatures exceeding +300°C without requiring external cooling jackets.
With global green hydrogen expansion, specialized micro-fused sensors constructed with hydrogen-embrittlement resistant alloys (Hastelloy C-276, Inconel 718) provide zero-permeation security up to 1,000 bar for hydrogen refueling stations.
Over two decades of precision engineering, research commitment, and global quality certification.
Huzhou Accuracy Instrument Co., Ltd is professionally engaged in the development, sales, and technical service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 gas density monitors, and micro-fused glass-to-metal seal pressure sensors. Our products are widely deployed across Mechanical Engineering, Chemical Processing, Food & Beverage, Pharmaceuticals, HVAC/R, and High-Technology Electric Power Appliances.
Established over two decades ago, our modern pressure manufacturing facility spans 3,000 square meters, equipped with advanced automated assembly lines, high-vacuum reflow ovens, and rigorous quality control testing rigs. As an industry pioneer, we integrate continuous product innovation with precision manufacturing engineering to deliver dependable measurement instruments to international clients across Europe, the Americas, Southeast Asia, and the Middle East.
Our quality control laboratory conducts 100% full-scale pressure cycle testing, helium mass spectrometer leak testing, and thermal environmental chamber simulations, strictly adhering to ISO 9001:2008 and ISO 17025 laboratory guidelines. Continuous process improvement underpins our market reputation for zero-leak performance under extreme industrial conditions, supported by a standard 1-year product warranty.
We strictly adhere to "Reasonable Price, Accurate Delivery, and Uncompromising Quality" managed under ISO9001:2008 certified systems.
In-depth answers to common engineering, customization, and procurement queries.
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