Explore our core catalog of heavy-duty, high-precision pressure gauges, bimetal thermometers, and digital transmitters customized for rigorous global industrial deployments.
In the rapidly expanding global clean energy ecosystem, Compressed Natural Gas (CNG) serves as a vital transition fuel for commercial fleets, public transit, and heavy transportation systems. Because CNG is compressed under extreme pressures ranging from 200 bar (2,900 PSI) to 350 bar (5,076 PSI), safety, structural integrity, and measurement accuracy are paramount. Selecting an established OEM CNG Pressure Gauge Manufacturer & Supplier is a critical engineering decision for Natural Gas Vehicle (NGV) OEMs, CNG fueling station builders, and industrial gas distribution companies.
Natural gas is inherently volatile, highly flammable, and prone to rapid thermal expansion. Mechanical gauges deployed on NGV storage cylinders, pressure reduction skids, and dispensing pumps must withstand continuous mechanical vibration, severe thermal fluctuations (-40°C to +120°C), and aggressive environmental exposure without seal degradation or calibration drift.
As a specialized manufacturer, Huzhou Accuracy Instrument Co., Ltd. builds CNG pressure gauges using advanced metallic alloys and precision assembly techniques. Our gauges are engineered from the ground up to prevent explosive failure modes and ensure accurate, real-time pressure monitoring under dynamic working loads.
The heart of a mechanical CNG gauge is its Bourdon tube element. We utilize high-tensile AISI 316L Stainless Steel or heat-treated beryllium copper alloys. For ultra-high-pressure applications (exceeding 250 bar), helical dynamic winding ensures stress distribution across multiple coils, preventing micro-fractures under cyclical pressure spikes during rapid fill cycles at fuel dispensers.
Safety compliance dictates that in the event of an internal Bourdon tube rupture due to extreme overpressure or internal explosion, high-pressure gas must be safely vented out the back of the case. Our OEM CNG gauges feature a solid front wall separating the dial face from the pressure element, coupled with a blow-out safety back plug (EN 837-1 S3 standard).
Heavy-duty trucks and buses operating on CNG generate continuous engine harmonics and road shock. Our gauges feature high-viscosity silicone fluid filling (or food-grade glycerine) which dampens movement flutter, lubricates internal gear movements, eliminates pointer resonance, and prevents internal condensation.
Modern NGV dashboard systems demand both visual and digital signal outputs. We provide dual-output OEM gauges featuring non-contact Hall-effect sensors or magnetic reed switches integrated inside the gauge case. This allows simultaneous mechanical dial reading and 0.5V-4.5V / 4-20mA signal transmission to the vehicle’s ECU.
| Parameter | Standard Specification | OEM Customization Options |
|---|---|---|
| Nominal Dial Size | 50 mm (2"), 63 mm (2.5"), 100 mm (4") | 40 mm to 150 mm custom cases |
| Accuracy Class | ±1.6% or ±1.0% of full scale | High precision ±0.5% Grade A4 |
| Pressure Ranges | 0 to 200 bar, 0 to 250 bar, 0 to 400 bar (dual scale bar/PSI) | Custom dial graphics, color zones, MPa, kg/cm² |
| Process Connection | 1/4" NPT, 1/4" BSP, M14x1.5 (Brass or 316 Stainless Steel) | 7/16-20 UNF, G1/4", SAE straight thread, radial/back mount |
| Operating Temperature | Ambient: -40°C to +65°C; Medium: up to +120°C | Extreme temperature seals (-50°C to +200°C) |
| Case & Bezel Material | AISI 304 Stainless Steel, Black Powder-Coated Steel | 316L SS, Chrome Plated Brass, Bayonet bezel ring |
| Window Glass | Polycarbonate (Shatter-proof), Laminated Safety Glass | Tempered glass with anti-glare coating |
| Enclosure Protection | IP65 Weatherproof (IEC 60529) | IP67 Hermetically Sealed for extreme washdown |
Navigating global automotive and industrial regulations requires strict adherence to international safety standards. Our manufacturing facility in Huzhou operates under rigorous quality control procedures to guarantee global market entry for your OEM products.
Essential European Economic Commission certification for components used in gaseous fuel systems on motor vehicles. Tests include burst pressure testing, thermal cycling, and continuous pressure pulsation endurance.
Specific standards for Road vehicles — Compressed Natural Gas (CNG) fuel system components. Ensures gauges maintain strict leak-tightness under extreme physical vibration and impact shocks.
For CNG refuel station dispensers and hazardous area installations (Zone 1 / Zone 2). Electrical contact gauges and sensors carry explosion-proof ratings to prevent electrical spark ignition of fugitive natural gas.
Every single CNG gauge produced in our facility undergoes 100% Helium Mass Spectrometer Leak Detection before shipment. We guarantee leak rates below 1x10⁻6 mbar·l/s, completely eliminating risk of methane leakage in enclosed engine bays or public refueling stations.
Partnering directly with a premier Chinese pressure gauge manufacturer gives global OEMs a massive competitive edge. By combining low total cost of manufacturing with advanced automated laser welding and CNC precision machining, Huzhou Accuracy Instrument Co., Ltd. delivers world-class quality at scalable unit economics.
Our OEM CNG pressure gauges are deployed across diverse global markets, tailored to meet local climate conditions and regional industry standards.
Mounted directly on CNG storage cylinders in light passenger vehicles, city transit buses, and heavy-duty logistics trucks. Built to resist engine heat, intense chassis vibration, and salt-spray road conditions.
Installed inside fast-fill public refueling station cabinets. Features high-visibility dual-scale dials (±1.0% accuracy) allowing station operators and vehicle drivers to monitor dispensing pressures in real-time.
Deploys on high-capacity CNG tube transport trailers carrying compressed gas at 250+ bar across long distances. Equipped with heavy-duty shock-proof liquid fill to handle severe highway transportation bumps.
Huzhou Accuracy Instrument CO LTD is professionally engaged in the development, sales and service of industrial mechanical pressure gauges, bi-metal thermometers, SF6 manometers, and digital pressure sensors. Products are widely used in Mechanical Engineering, Chemical Engineering, Food Industry, Pharmaceutical, and high technology electric appliances.
Established over two decades ago, our pressure gauge manufacturing facility spans 3,000 square meters, equipped with advanced production lines and rigorous quality control systems. As an industry leader, we integrate innovation with precision engineering to deliver reliable measurement solutions for global clients.
20 Specialists: Focuses on material innovation, smart sensor integration, micro-machining, and full compliance with international standards (e.g., ISO, API, ASME, EN).
120 Technicians: Utilizes automated laser welding, dynamic balance testing, and micro-calibration technologies to ensure structural durability and lifetime accuracy.
15 Professionals: Provides 24/7 technical support, direct factory pricing, rapid export logistics, and customized OEM solutions across 30+ countries.
We have long followed the concept of "reasonable price, accurate delivery, good quality" and several business management models to keep our production quality above the required international benchmark.
Get expert technical answers regarding custom specifications, minimum order quantities (MOQ), global compliance standards, and factory engineering support.
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