Select from our standard industrial catalog engineered for high accuracy, vibration immunity, and harsh fluid media compatibility.
Huzhou Accuracy Instrument Co., Ltd. is a globally recognized manufacturer and R&D innovator specializing in high-reliability industrial pressure and temperature sensing instruments. Over two decades of intensive research and engineering refinement have established our reputation as a trusted primary tier supplier for severe-service industrial applications worldwide.
Spanning a modern 3,000 square meter ISO 9001-certified intelligent manufacturing hub, our facility integrates fully automated SMT laser trimming lines, pressure cycling test chambers, and precision calibration equipment. We engineered our proprietary Al₂O₃ Ceramic Pressure Sensor Cells to address the failure points of traditional piezoresistive metallic silicon sensors, delivering absolute resistance to abrasive slurry, strong acids, and severe hydraulic spikes.
Focused on advanced ceramic substrate metallurgy (96% to 99.5% Al₂O₃ formulations), thick-film strain resistor printing, ASIC custom signal conditioning, and international standardization compliance (ISO, API, CE, RoHS).
Operates 100% automated assembly lines, micro-laser resistor calibration stations, and automated temperature compensation chambers ensuring identical zero-point stability across high volume runs.
Delivers 24/7 technical field engineering support, fluid compatibility consulting, custom thread/connector design, and rapid prototyping for OEM system integrators in 30+ countries.
Our enterprise strictly operates under ISO 9001:2008 and ISO 17025 accredited laboratory workflows. Every ceramic pressure transmitter undergoes 100% pressure cycle overload testing, zero-to-span thermal shock cycles (-40°C to +125°C), and liquid leak testing to guarantee zero-leak operational safety.
In modern process automation, selecting the correct sensor cell metallurgy dictates long-term drift, thermal stability, and total cost of ownership (TCO). Ceramic (Aluminum Oxide, Al₂O₃) pressure sensors provide a robust physical alternative to metallic oil-filled piezoresistive piezocrystals and isolated stainless steel diaphragms.
Thick-film ceramic pressure sensors utilize high-purity 96% Al₂O₃ ceramic base diaphragms. Microscopic strain gauges are printed directly onto the dry reverse side of the ceramic diaphragm using thick-film screen-printing technology and high-temperature glass-frit sintering (>850°C).
For ultra-low pressure ranges (e.g., 0...10 mbar to 0...2 bar) requiring supreme accuracy, dry capacitive ceramic cells utilize 99.5% Al₂O₃ substrates. The primary ceramic diaphragm and base plate form a variable capacitor arrangement with gold or platinum electrode coatings.
| Performance Parameter | Thick-Film Piezoresistive Ceramic (Al₂O₃) | Dry Capacitive Ceramic (99.5% Al₂O₃) | Isolated Stainless Steel (Piezoresistive Silicon) |
|---|---|---|---|
| Operating Pressure Range | 1 bar to 600 bar | 0.01 bar to 70 bar | 0.1 bar to 1000+ bar |
| Internal Transfer Fluid | Dry (No Oil Fill) | Dry (No Oil Fill) | Silicone / Synthetic Oil Filled |
| Corrosion Resistance | Exceptional (Acids, Bases, Slurry) | Superior / Extreme Chemical Inertness | Limited by Diaphragm Foil (316L / Hastelloy) |
| Burst Pressure Margin | High (300% FS) | Extreme (up to 800% FS) | Moderate (200% FS) |
| Thermal Hysteresis | < 0.15% FS | < 0.05% FS | < 0.2% FS (Oil Expansion Drift) |
| Sanitary Safety Risk | Zero Contamination Risk | Zero Contamination Risk | Diaphragm Rupture Oil Risk |
| Cost Profile (TCO) | Highly Economical OEM Scale | Premium High-Precision | Medium to High Maintenance |
Raw sensor signals from ceramic elements are non-linear voltage changes across a Wheatstone bridge. Huzhou Accuracy Instrument integrates proprietary Application-Specific Integrated Circuit (ASIC) signal conditioners directly adjacent to the ceramic core. This architecture offers:
Every unit undergoes continuous thermal cycling from -40°C to +125°C in automated testing chambers. Polynomial digital compensation coefficients are burned into the ASIC EEPROM to neutralize thermal drift.
Conditioned outputs include analog industrial standard 4-20mA (2-wire loop powered), 0.5-4.5V ratiometric, 0-10V, and digital protocols including RS485 Modbus RTU & IO-Link.
Integrated surge protection, reverse polarity protection, and high-frequency RF immunity according to IEC 61000-6-2/4 standards prevent signal jitter near heavy electric motors and variable frequency drives (VFDs).
Engineered to excel where conventional pressure transducers degrade, our ceramic sensor solutions are deployed globally across demanding operational environments.
Corrosive chemical dosing pumps, acid storage tanks, and aggressive gas monitoring require zero metallic exposure. Our ceramic sensors feature PVDF, PTFE, or 316L housings paired with FKM/FFKM O-rings, providing full immunity to hydrochloric acid, chlorine gas, and caustic soda dosing.
Mobile hydraulic equipment, excavators, and injection molding machinery subject pressure sensors to severe pressure spikes (water hammer) and mechanical shock. The inherent physical hardness of ceramic combined with pulse dampeners protects against internal diaphragm plastic deformation.
Vehicle fuel systems operating under high pressure demands (such as CNG/LNG vehicle conversions) utilize specialized micro-pressure sensors. Our 5V/12V automotive gauges and ceramic transmitters provide explosion-proof compliance, high shock resistance, and thermal tolerance down to -40°C.
Electrical power distribution substations rely on specialized SF6 Gas Density Monitors to prevent arcing catastrophes. Our SF6 manometers incorporate temperature-compensated ceramic sensing cells delivering ultra-long zero stability in switchgear installations.
As smart manufacturing transitions towards Industry 4.0, pressure sensing hardware is evolving from simple passive transducers to intelligent, self-diagnostic edge compute nodes.
Integration of micro-sized IO-Link stacks directly into ceramic transmitter sensor heads enables real-time device health diagnostics, operating hours logging, thermal peak memory, and remote parameterization without process interruption.
Current R&D is advancing direct laser-brazed ceramic-to-metal joints, removing organic elastomeric O-rings entirely. This allows ceramic cells to operate continuously in molten plastics, steam lines, and high-temp reactors up to 200°C.
Pairing piezoresistive ceramic cores with ultra-low-power BLE 5.4 and WirelessHART communication modules enables battery-operated pressure monitoring stations with 10+ year battery lifespans for remote pipelines and storage tanks.
Huzhou Accuracy Instrument leverage strategic supply chain integration in Zhejiang province, cutting procurement lead times while ensuring uncompromised precision engineering.
Thick-film resistor trimming is executed via automated robotic CNC laser systems, trimming electrical bridge resistance tolerances to within 0.01% before sealing, maximizing yield stability.
From raw ceramic substrate sintering to CNC stainless steel body machining, plastic injection connector molding, and final calibration, 90%+ of production steps are managed in-house to reduce lead times to 2-3 weeks.
We offer full private label branding, customized pressure scales (PSI, Bar, MPa, Kgf/cm²), custom electrical pinouts (Hirschmann, M12, Direct Cable), and bespoke thread connections (G1/4, NPT1/4, 7/16-20UNF).
Navigating global industrial component sourcing requires transparency, regulatory compliance, and robust risk mitigation. Huzhou Accuracy Instrument supports global procurement officers and system design engineers with standard-compliant products and clear commercial terms.
Our products meet global market access requirements:
We streamline B2B contract manufacturing through structured operational protocols:
Find technical answers regarding ceramic pressure sensor integration, chemical compatibility, and installation best practices.
Ceramic pressure sensors utilize a dry sensing cell (Al₂O₃) with no internal silicone oil fill. This eliminates the risk of fluid contamination in critical processes like sanitary food production, drinking water, or pharmaceutical processing. Furthermore, ceramic exhibits superior hardness, resisting mechanical abrasion from slurries and chemical attack from harsh acids where thin stainless steel diaphragms would fail.
Ceramic sensor cells possess high burst pressure safety margins (typically 300% to 500% of nominal range). Because the ceramic diaphragm rests against a rigid ceramic base plate backstop under extreme overload, it physically prevents diaphragm deformation during hydraulic hammer events, unlike metallic diaphragms which permanently deform.
While the ceramic substrate (96% or 99.5% Al₂O₃) is nearly inert, internal seal selection is crucial. We offer Viton (FKM) for standard oils and hydraulic fluids, EPDM for hot water and steam, Fluorosilicone for low temperatures, and FFKM (Kalrez) for extreme acid and solvent compatibility.
We support standard 4-20mA current loops (2-wire), 0-5V, 0-10V, 0.5-4.5V ratiometric, and digital RS485 Modbus RTU interface options. Custom signal outputs and fieldbus protocols can be integrated upon request for OEM projects.
Standard catalogue samples ship within 3-5 business days. Custom OEM configurations (custom thread, connector, or pressure range) take approximately 2-3 weeks for initial batches, supported by scalable automated volume manufacturing.
Explore our complete range of specialized industrial instrumentation, including explosion-proof electric contact gauges, SF6 monitors, and capillary thermometers.
Partner directly with Huzhou Accuracy Instrument Co., Ltd. for engineering samples, custom thread/housing machining, and volume factory-direct pricing.
Accuracy Instrument