20 YEARS OF EXPERIENCE AND RESEARCH IN FLUID & THERMAL MEASUREMENT
Huzhou Accuracy Instrument Co., Ltd. is professionally engaged in the development, sales, and technical servicing of high-tier industrial mechanical pressure gauges, bi-metal oil temperature indicators, SF6 gas density manometers, and integrated pressure sensors. Our solutions are deployed globally across demanding application sectors, including Mechanical Engineering, Petrochemical Processing, Marine Transportation, Automotive Powertrains, Food & Pharmaceutical Production, and High-Voltage Electric Utilities.
Established over two decades ago, our pressure gauge manufacturing facility spans over 3,000 square meters. It is fully integrated with automated assembly lines, high-vacuum liquid filling chambers, and automated laser calibration suites. As an industry pioneer in China, we fuse thermomechanical precision with smart sensor technology to ensure flawless operational reliability for international OEMs and system integrators.
Our annual manufacturing capacity exceeds 2 million precision units. Product lines span stainless steel shock-proof gauges, liquid-filled oil temperature gauges, explosion-proof electric contact manometers, SF6 gas density monitors, and piezoresistive silicon pressure transmitters. Certified under ISO, SGS, and CE, our products are widely praised for superior corrosion resistance and long-term zero-drift stability.
Our state-of-the-art testing laboratory subjects 100% of manufactured instruments to rigorous pressure cycle testing, thermal shock chambers (-40°C to +150°C), and micro-leak mass spectrometer analysis. Adhering strictly to ISO 9001:2015 standards, we provide complete compliance documentation, material traceability certifications, and a standard one-year operational warranty.
We strictly execute "Accurate Measurement, Timely Delivery, Superior Reliability" principles across all manufacturing processes.
Modern industrial equipment—ranging from heavy machinery hydraulics to marine propulsion engines—demands simultaneous monitoring of fluid pressure and oil operating temperature. Single-function sensors introduce multiple failure points and increase manifold tapping costs. China's leading manufacturing facilities now pioneer dual-function combo instruments. By combining a C-type or helical Bourdon tube with a co-axial bimetallic thermal element or PT100 RTD sensor inside a single SS316 casing, engineers achieve real-time monitoring of oil viscosity fluctuations alongside pressure dynamics.
Standard mechanical gauges fail prematurely under intense hydraulic pulsation and mechanical vibration. High-tier China suppliers utilize automated vacuum filling technology to inject high-purity Glycerin (99.5%) or Silicone Oil (for extreme temperatures: -40°C to +200°C). Liquid filling lubricates internal movement gears, dampens pointer flutter caused by pressure spikes, and prevents internal condensation, ensuring extended calibration longevity in severe heavy-duty environments.
In petrochemical plants, off-shore oil rigs, and sanitary processing lines, aggressive process fluids quickly erode standard brass internals. The integration of laser-welded diaphragm seals (fabricated from Hastelloy C-276, Tantalum, or SS316L) isolates the measuring element from aggressive or viscous fluids. China's specialized suppliers employ finite element analysis (FEA) to design diaphragm corrugations that maintain high sensitivity even under micro-pressure and sub-zero temperature regimes.
Selecting the optimal oil pressure and temperature gauge requires aligning mechanical housing, wet parts, and fill fluids with actual process parameters. Review our engineering matrix below for precise operational matching.
| Instrument Type | Wetted Material | Pressure / Temp Range | Accuracy Class | Primary Industrial Application |
|---|---|---|---|---|
| Standard Mechanical Gauge | Brass / Copper Alloy | 0...0.6 MPa to 0...100 MPa | Class 1.6 / Class 2.5 | General Air Compressors, Standard Hydraulic Units |
| Oil-Filled Shock Gauge | SS304 / Brass Connection | 0...1.6 Bar to 0...1000 Bar | Class 1.0 / Class 1.6 | Heavy Excavators, High-Pulsation Pumps |
| Laser-Welded Diaphragm Gauge | SS316L / Hastelloy C | -0.1...0 to 0...4 MPa (Micro-pressure) | Class 1.0 | Corrosive Chemical Lines, Viscous Crude Oil |
| Explosion-Proof Electric Contact | SS316 / Flameproof Housing | 0...0.6 MPa to 0...60 MPa | Class 1.6 | Hazardous Gas/Oil Refining (ATEX Zone 1/2) |
| Piezoresistive Digital Transmitter | Diffused Silicon / SS316L | -1...1 Bar to 0...1000 Bar | -40~125°C | ±0.25% / ±0.5% FS | Smart IIoT Automation, Remote SCADA Systems |
Global procurement directors face intensifying pressures regarding Total Cost of Ownership (TCO), supply chain resilience, and stringent environmental compliance (RoHS, REACH). Strategic sourcing of oil pressure gauges and oil temperature sensors from established Chinese direct manufacturers like Huzhou Accuracy Instrument Co., Ltd. presents three distinct structural advantages:
From raw copper alloy machining and Bourdon tube forming to automated laser welding and glass sealing, vertically integrated China factories minimize component lead times while guaranteeing strict batch-to-batch repeatability. Purchasing directly eliminates intermediate markups while ensuring direct engineering access.
Global equipment OEM requirements vary wildly regarding thread standards (NPT, BSP, BSPT, Metric), dial face artwork, dual-scale units (PSI/Bar/KPa), electrical output formats (4-20mA, 0-10V, RS485 Modbus), and custom temperature probe lengths. Chinese factories provide turnkey custom drawing production with minimal prototype lead times.
Modern Chinese manufacturers do not compromise on quality. Automated testing benches perform hydrostatic overpressure validation, helium leak testing, and digital optical calibration verification on 100% of outgoing production lots, meeting ISO 9001:2015 and CE certification standards.
As Industry 4.0 transforms process manufacturing, traditional mechanical gauges are rapidly evolving into intelligent node devices. Our technology roadmap incorporates low-power NB-IoT, LoRaWAN, and Bluetooth Mesh protocols into digital pressure transmitters and density monitors. This enables continuous remote telemetry, predictive maintenance alerts for engine oil degradation, and cloud-based asset tracking without manual reading errors.
Next-generation hydraulic systems operating in sub-arctic or desert environments require advanced materials. We actively invest in specialized alloy formulations—such as Monel 400 for marine salt-spray immunity and Inconel 718 diaphragms for extreme temperature resilience up to 400°C—ensuring unbroken operation under harsh climate conditions.
To support global equipment distribution, our products are engineered to conform strictly with international standards, including EN 837-1 (Pressure Gauges Standard), ASME B40.100, ATEX Directive 2014/34/EU for explosive atmospheres, and CE Low Voltage / EMC Directives. Complete material test reports (MTRs according to EN 10204 3.1) are available upon request for high-integrity energy infrastructure projects.
Oil-filled (glycerin or silicone oil) pressure gauges are specifically engineered for environments with heavy mechanical vibration and rapid pressure pulsations, such as internal combustion engines or hydraulic pumps. The liquid fill dampens pointer movement, lubricates internal gears to minimize mechanical wear, protects the internal mechanism from corrosive ambient gases, and prevents internal lens fogging caused by thermal condensation.
Glycerin (99.5% purity) is the industry standard for standard operating temperatures ranging from -20°C to +60°C (-4°F to +140°F) and provides excellent damping efficiency. However, for extreme temperature applications (e.g., outdoor arctic installations or high-temperature engine manifolds ranging from -40°C to +200°C), Silicone Oil is required due to its thermal stability and lower temperature-viscosity coefficient.
For general machinery and vehicle dashboard monitoring, Accuracy Class 1.6 or Class 2.5 (per EN 837-1, indicating full-scale error within ±1.6% or ±2.5%) is sufficient. For critical industrial processing, hydraulic calibration, or turbine engine test beds, high-precision Class 1.0 or digital transmitters with ±0.25% FS accuracy are recommended to prevent pressure drift and ensure optimal fluid system safety.
Yes. Electric contact pressure gauges (such as our 0.6 MPa explosion-proof models) feature adjustable magnetic-assisted or inductive contact points. When system oil pressure falls below a safe operating threshold or exceeds a maximum limit, the contact circuit opens or closes, instantly triggering an alarm horn or sending a signal to shut down the oil pump motor, thereby preventing catastrophic engine seizure.
We offer complete OEM/ODM manufacturing customization. This includes custom dial faces with company branding, multi-colored pressure zone indicators, process thread connections (NPT, BSP, METRIC, SAE), capillary tube lengths for remote bimetal oil temperature readings, electrical junction outputs (DIN 43650, M12 pin connectors), and customized explosion-proof housing materials.
Accuracy Instrument
