Precision-engineered mechanical pressure gauges, differential transmitters, and bimetallic temperature instrumentation manufactured for extreme field environments.
Established over two decades ago, Huzhou Accuracy Instrument Co., Ltd. has grown into a premier global OEM hub and direct manufacturer of industrial mechanical pressure gauges, bi-metal thermometers, SF6 density manometers, and piezoresistive pressure sensors. Operating from a modern 3,000-square-meter state-of-the-art facility, our manufacturing plant incorporates automated robotic laser welding, vacuum fluid-filling stations, and automated calibration rigs.
As a trusted partner to EPC contractors, original equipment manufacturers, and instrumentation distributors in over 30 countries, we maintain strict compliance with international standards including ISO 9001:2008 and ISO/IEC 17025 laboratory guidelines. Our comprehensive engineering framework provides zero-leak reliability, robust vibration dampening, and high accuracy (±0.5% to ±1.6% FS) across volatile process environments.
Focuses on advanced metallurgical alloy selection (316L SS, Monel, Hastelloy), microfused MEMS sensor integration, digital protocols (HART, Modbus RS485), and standard compliance for harsh environments.
Utilizes automated surface-mount technology (SMT), CNC precision machining, automated laser pointer adjustment, and vacuum glycerin-filling lines to ensure long-term structural durability.
Delivers 24/7 technical consultation, OEM/ODM artwork customization, dual-scale calibration support, and end-to-end export documentation across North America, Europe, Asia, and the Middle East.
Why leading global EPC firms and instrumentation brands leverage Huzhou Accuracy Instrument's OEM production ecosystem.
Located within China's Yangtze River Delta precision manufacturing cluster, our facility gains immediate access to high-purity 316L stainless steel tubing, phosphor bronze Bourdon tubes, high-precision bimetallic coil stock, and optical glass lenses, drastically scaling production turnarounds.
Every batch undergoes rigorous quality assurance including 100% over-pressure overload testing, high-temperature environmental chamber aging, 100% helium mass spectrometer leak detection, and automatic digital pressure calibration adhering to EN 837-1 standards.
We offer extensive custom engineering options ranging from dial face branding, customized pressure scales (Bar, PSI, KPa, MPa, Kg/cm²), specialized process connections (NPT, G, PT, Metric), to custom liquid dampening fills (Silicone Oil, Glycerin, Fluorolube).
| Specification Category | Standard Configuration | OEM / ODM Custom Options |
|---|---|---|
| Dial Diameters | 40mm (1.5"), 50mm (2"), 63mm (2.5"), 100mm (4"), 150mm (6") | Custom rectangular, mini 25mm, or enlarged 200mm+ dials |
| Accuracy Classes | Class 2.5, Class 1.6, Class 1.0 | Precision Class 0.5, Class 0.25 (Master Test Gauges) |
| Wetted Materials | Brass / Copper Alloy, Stainless Steel 304 | Stainless Steel 316L, Monel 400, Hastelloy C-276, PTFE Coating |
| Pressure Ranges | -1 to 0 Bar (Vacuum), 0 to 1000 Bar (High Pressure) | Compound ranges (-1 to +24 Bar), Ultra-high pressure (0-4000 Bar) |
| Temperature Range | Ambient: -40°C to +60°C; Process: Up to +100°C | Extended High Temp: Up to +600°C with capillary/cooling tower |
| Output Signals | Mechanical Dial Pointer | 4-20mA 2-wire, 0-10V, RS485 Modbus, Electric Switch Contacts (SPDT) |
How next-generation sensing technology, IIoT integration, and green grid initiatives are driving instrument design.
Modern smart factories demand real-time process visibility alongside local mechanical redundancy. Industry 4.0 trends favor hybrid pressure gauges equipped with piezoresistive silicon chips or microfused MEMS technology. These systems display local pressure via mechanical dials while transmitting continuous 4-20mA or HART digital telemetry to centralized SCADA systems.
With electrical utilities transitioning to green high-voltage switchgear, SF6 gas density monitors require micro-temperature compensation mechanisms to prevent false low-pressure alarms. Our SF6 manometers feature bimetallic temperature compensation mechanisms that calculate true gas density independent of ambient thermal fluctuations.
Industrial machinery, engine common rail test stands, and heavy pumps subject gauges to intense mechanical shock and pulsation. The shift toward silicone-filled and glycerin-filled all-stainless-steel cases prevents pointer flutter, lubricates internal gears, and extends operational lifespan under severe continuous duty cycles.
Eliminating organic adhesive bonds, glass microfused pressure sensors fuse strain gauges directly to stainless steel diaphragms at high temperatures. This engineering breakthrough produces transducers capable of withstanding extreme pressure spikes and hydraulic water hammer without zero-drift distortion.
Customized instrumentation configurations tailored to rigorous sector-specific operational environments.
Challenge: Corrosive H2S media, marine salt fog, and high ambient vibration.
Solution: All-Stainless Steel 316L Bourdon tube pressure gauges with NACE MR0175 compliance, IP67 hermetic sealing, safety pattern blow-out backs, and liquid glycerin filling to prevent internal corrosion and pointer fatigue.
Challenge: SF6 gas leakage monitoring in Gas-Insulated Switchgear (GIS) under variable outdoor climates.
Solution: 63mm compensated SF6 gas density monitors featuring integrated SPDT electric alarm contacts, magnetic snap-action switches, and high isolation resistance to ensure uninterrupted grid protection.
Challenge: Simultaneous pressure and temperature measurement in compact mechanical rooms.
Solution: Combined Thermo-Hydrometers and Every-Angle Stainless Steel Bi-Metal Thermometers with electric switch contacts, enabling dual parameter monitoring in a single process tap.
We strictly adhere to "Reasonable Price, Accurate Delivery, High Quality" guidelines under our ISO 9001:2008 certified management systems. Every product line carries CE, RoHS, and SGS verification.
Expert technical answers regarding pressure gauge selection, OEM customization, and calibration standards.
Dry pressure gauges are lightweight and cost-effective solutions designed for static environments without severe vibration or rapid pressure pulsation (e.g., standard air compressors, HVAC lines). Liquid-filled pressure gauges (containing Glycerin or Silicone oil) internalize fluid to dampen mechanical shocks, lubricate pointer gear mechanisms, and prevent condensation inside the dial lens, making them ideal for heavy hydraulic machinery, diesel engines, and high-pulsation pumps.
Our plant uses automated TIG and laser welding technologies to fuse the Bourdon tube directly to the process connection, creating a solid single-piece seal. Every production lot undergoes 100% helium mass spectrometer leak detection and thermal cycle aging. Calibration is performed using automated optical sensor rigs compliant with ISO/IEC 17025 precision benchmarks.
Yes. As a direct OEM manufacturer, we support fully custom dial artwork, multi-scale engineering units (PSI, Bar, KPa, MPa), private labeling, custom bezel rings, and non-standard thread connections including NPT, BSP/G, PT, and Metric threads in brass, 304SS, or 316L SS.
Bimetallic thermometers operate on the mechanical principle of dual metals expanding at different rates. Because they require no external electrical power, they are inherently explosion-proof and reliable for chemical, petrochemical, and pharmaceutical lines. Our every-angle adjustable stem design allows operators to rotate the dial 180 degrees for easy reading in complex piping layouts.
Standard product samples can be dispatched within 3 to 5 working days. Full OEM production runs typically range from 15 to 25 days depending on the volume and specialized material specifications (e.g., Hastelloy, Monel diaphragms).
Select from our extensive catalog of high-performance industrial measurement instrumentation.
Accuracy Instrument
