Explore our factory-direct, high-precision measurement instruments engineered for extreme vibration, severe thermal stress, and corrosive operational environments.
Two Decades of Metrological Mastery, Engineering Rigor, and Global Industrial Supply
Huzhou Accuracy Instrument Co., Ltd. is professionally engaged in the research, development, sales, and technical service of high-precision industrial mechanical pressure gauges, dual-parameter oil pressure and temperature combination gauges, bi-metal thermometers, SF6 gas density monitors, and intelligent pressure sensors.
Established over two decades ago, our state-of-the-art pressure gauge manufacturing facility spans 3,000 square meters in Zhejiang, equipped with automated CNC machining centers, automated laser-welding work cells, high-vacuum helium mass spectrometer leak detectors, and automated multi-point pressure calibration benches. As an industry leader, we seamlessly integrate metallurgical innovation with micro-mechanical precision to deliver zero-defect instrumentation for Fortune 500 equipment builders, marine propulsion specialists, and hydraulic machinery OEMs across 30+ countries.
Our dedicated R&D division consists of 20 specialized engineers focusing on diaphragm metallurgy, piezoresistive hybrid integration, finite element thermal analysis, and international compliance standards including ISO 5171, EN 837-1, and ASME B40.100.
Driven by 120 highly skilled technicians, our automated assembly lines utilize robotic pick-and-place calibration, automated movement balancing, and laser hermetic seam welding to ensure maximum long-term durability under intense cyclic fatigue.
Supported by a 15-professional sales and application team, we offer 24/7 technical consulting, custom dial layout design, tailor-made pressure range configuration, and rapid prototype turnarounds for international OEM partners.
Analyzing the paradigm shift toward integrated thermal-hydraulic diagnostic systems in heavy industry, marine, and mobile equipment sectors.
Modern industrial equipment manufacturers are rapidly moving away from redundant single-parameter sensors. The industry demand has shifted toward dual oil pressure and oil temperature combination gauges. OEM buyers now require mechanical visual red-line indication paired with digital CAN bus, 4-20mA, or 0.5-4.5V ratiometric sensor outputs, allowing local field operators and automated PLC control systems to monitor lubrication integrity simultaneously.
Tier-4 final diesel engines, high-pressure hydraulic power packs, and heavy off-highway machinery operate under extreme mechanical shocks (up to 20g continuous) and severe fluid thermal spikes (-40°C to +150°C). Global OEMs require oil pressure and oil temperature gauges featuring liquid-filled dampening (silicone oil or high-purity glycerin), vibration-proof Bourdon tube anchoring, and shatter-proof polycarbonate or toughened safety glass lenses.
Lubricating oil viscosity drops exponentially as fluid temperatures exceed critical operational thresholds (e.g., >100°C in heavy marine diesels), leading to boundary lubrication failure, metal-to-metal contact, and catastrophic bearing seizure. Conversely, insufficient oil pressure at nominal temperatures indicates pump cavitation or filter clogging. A combined oil pressure and temperature gauge acts as the primary diagnostic shield, allowing preventative shutdown protocols before severe mechanical breakdown occurs.
| Parameter Specifications | Mechanical Bourdon / Bimetal Dual Gauge | Electronic Transducer + Thermistor Module | Hybrid OEM Dual Sensing Platform (Huzhou OEM) |
|---|---|---|---|
| Primary Advantage | Zero external power required; visual inspection | High-speed telemetry to ECU / Scada systems | Direct visual dial readout + simultaneous ECU signal export |
| Vibration Resistance | Requires liquid-filling (Glycerin/Silicone) | Solid-state (High shock endurance) | Internal silicone dampening + solid-state potted electronics |
| Operating Temperature | -40°C to +200°C (Process Media) | -40°C to +125°C (Circuit limited) | -40°C to +150°C continuous continuous operational range |
| Target OEM Applications | Generator sets, classic marine engines, HPUs | Modern automotive ECUs, automated industrial robotics | Heavy construction machinery, mining rigs, offshore propulsion |
| Cost-Efficiency Ratio | Low capital expenditure | Medium to high installation complexity | Optimal TCO (Total Cost of Ownership) via dual function |
How Huzhou Accuracy Instrument combines localized raw material clusters with automated manufacturing to guarantee zero-defect delivery globally.
Our facility incorporates fully automated laser welding for Bourdon-tube-to-socket joints and seam sealing. Robotic calibration arms automatically index dial faces across 5 distinct pressure-temperature calibration points, eliminating human parallax error and ensuring strict conformance to Class 1.0 and Class 1.6 precision standards.
Located in the heart of Yangtze River Delta industrial manufacturing zone, Huzhou Accuracy Instrument benefits from direct access to premium SS316L stainless steel mills, precision brass extrusion facilities, and specialized silicone dampening fluid refiners. This cluster effect provides unmatched supply chain resilience and cost stability.
Every single oil pressure and oil temperature gauge unit undergoes rigorous quality testing before dispatch: 100% over-pressure cycle testing (up to 130% full scale), thermal shock chamber cycling (-40°C to +120°C), and vacuum helium mass spectrometry leak detection ensuring zero liquid leak and zero gas escape.
Meeting the demanding criteria of international procurement directors, OEM design engineers, and industrial distributors.
For demanding offshore oil platforms, agricultural machinery, and heavy industrial plant installations, material failure is not an option. Huzhou Accuracy Instrument manufactures housings in corrosion-resistant AISI 304 and AISI 316L stainless steel, with wetted parts made of high-tensile copper alloy (brass CW614N) or seamless 316L tubes. All materials comply strictly with REACH, RoHS, and heavy metal restriction directives.
Our operational management systems are accredited under ISO 9001:2008 guidelines, while our testing laboratory operates in alignment with ISO/IEC 17025 metrology standards. Our product portfolios carry valid CE Certifications, conforming to Pressure Equipment Directive (PED) 2014/68/EU and Electromagnetic Compatibility (EMC) regulations for electronic contact gauges and transmitters.
We provide full-spectrum custom engineering for global original equipment manufacturers. Customization parameters include: dual-scale dial artwork (PSI/Bar, °C/°F, kPa), specialized thread connections (NPT, BSP, BSPT, Metric M20x1.5, M14x1.5), electrical connector pinouts (Deutsch DT04, Hirschmann DIN 43650, AMP Superseal), integrated warning micro-switches, anti-vibration snubber capillary tubes, and client logo branding.
Deploying specialized pressure and thermal measurement devices across vital industrial sectors worldwide.
Excavators, wheel loaders, and agricultural harvesters operating in high-vibration terrain require ruggedized oil pressure and temperature gauges to continuously monitor engine crankcase health and hydraulic transmission fluid loops.
Commercial vessels, tugboats, and offshore supply ships rely on liquid-filled SS316 gauges to monitor gearboxes, auxiliary diesel generators, and heavy fuel oil supply modules against salt-spray corrosion and motor harmonics.
Continuous standby diesel and natural gas power generators utilize electric contact oil gauges connected directly to emergency shutdown relays to prevent catastrophic thermal runaways or lubrication loss.
Factory automation systems, stamping presses, and injection molding machinery utilize high-pressure diaphragm gauges and oil-filled manometers to maintain steady hydraulic system pressure up to 700 Bar (10,000 PSI).
We adhere to strict business management models to maintain production quality above required international benchmarks under our ISO9001 certified Quality System.
Technical guidance regarding gauge selection, installation, calibration, and direct OEM factory procurement.
A dual combination gauge integrates two independent sensing elements within a single housing assembly: a mechanical C-shaped Bourdon tube or piezoresistive sensor for hydraulic oil pressure (reading in PSI/Bar/MPa), and a bimetallic coil, capillary bulb, or RTD Pt100/thermistor sensor for oil fluid temperature (reading in °C/°F). This dual sensing design reduces installation ports and panel space while providing synchronized diagnostic data.
Liquid filling dampens high-frequency mechanical vibrations generated by internal combustion engines and hydraulic pumps, preventing pointer flutter and internal gear wear. Standard high-purity Glycerin (99.5%) is ideal for ambient temperatures between -20°C and +60°C. For extreme climate conditions (-40°C to +100°C) or high thermal fluid contact, low-viscosity Silicone oil is recommended due to its thermal stability and flat viscosity-temperature index.
For offshore marine propulsion, chemical process plants, or corrosive industrial environments, we recommend full stainless steel construction: AISI 304 housing with AISI 316L wetted parts (Bourdon tube and process connection). Stainless steel provides superior resistance to salt spray, atmospheric oxidation, and aggressive synthetic lubrication additives.
Standard industrial mechanical oil pressure gauges conform to Class 1.6 (±1.6% of full scale span) or Class 1.0 (±1.0% FS) according to EN 837-1 standards. Precision laboratory test gauges and high-precision electronic transmitters manufactured by Huzhou Accuracy Instrument achieve accuracies of up to ±0.5% or ±0.25% FS.
Yes. As a factory-direct OEM manufacturer, we offer complete customization: process threads including NPT (1/8", 1/4", 1/2"), BSP/G threads, Metric threads (M10x1, M14x1.5, M20x1.5), dual scale units, custom warning zones (green/yellow/red color bands), company logo printing, and specialized electrical wiring harnesses.
For standard models, our typical production lead time is 2 to 3 weeks. Custom OEM/ODM orders requiring specialized tooling or custom dial artwork generally take 3 to 4 weeks. Flexible MOQ options are available for prototype evaluation and initial engineering trial runs.
Browse our extensive lineup of transmitters, bimetallic thermometers, diaphragm gauges, and specialty gas monitors.
Accuracy Instrument