CE Certification 140 Bar / 2000 PSI Black Steel Pressure Gauge – ¼ NPT, Radial Mount from China Suppliers and Factory Supplier, Suppliers

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The black iron shell oxygen gauge, also referred to as a black iron shell oxygen pressure gauge or oil-free oxygen gauge, is a specialized oil-free pressure measuring instrument meticulously designed for oxygen media. This high-quality product features a durable black iron powder-coated shell combined with an oil-free pressure measuring system. It is perfectly suited for various applications including oxygen cylinders, welding and cutting tasks, medical oxygen supply, and chemical industries, effectively serving for oxygen pressure display and safety monitoring. With its low cost, excellent protection, and strong adaptability, it stands out among other China suppliers of pressure gauges.

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This oxygen gauge boasts a corrosion-resistant and impact-resistant black iron casing, complete with a glass crystal, making it ideal for both industrial and outdoor use. The pressure sensing elements utilize phosphor bronze or copper alloy Bourdon tubes, while all movement and connectors are crafted from copper alloy. The entire design is oil-free, significantly reducing the risk of explosion from grease-oxygen mixtures, ensuring safe operation across various environments. As a leading factory in this sector, we prioritize safety and reliability.

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The gauge features an intuitive pointer and dial indication, clearly marking pressure units (MPa/PSI) with an optional dual scale for easy reading of pressure values. Connection and sealing components utilize robust copper connectors, available with thread options including NPT, BSP, ZG, etc. Each unit is equipped with sealing gaskets to guarantee airtightness and leak-proof functionality, reinforcing our commitment to quality as reputable China suppliers.

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Product Description

Product Specifications

Case Black Steel / Steel
Size 40mm (1.5"), 50mm (2"), 60mm (2.5"), 75mm (3"), 100mm (4")
Ring (Cover) Black Steel / Chromed
Window Glass
Pointer Aluminum Alloy, Black Finished
Connection Brass
Connection Location Lower, Center Back, Lower Back
Thread 1/8", 1/4", 3/8", 1/2"; PT (BSPT, ZG), BSP (G, PF), NPT etc.
Element (Bourdon Tube) Brass
Movement Brass
Dial Plate White Aluminum with Black Graduations

Core Features and Advantages

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Oil-Free Safety Features
As a dedicated oxygen gauge, its core pressure-sensing components (Bourdon tube, mechanism) and connectors are all treated with oil-free processes. This completely eliminates the risk of combustion and explosion caused by contact between grease and high-pressure oxygen — a core safety advantage that distinguishes it from ordinary pressure gauges.
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High Cost-Effectiveness
The black iron powder-coated shell has a lower cost, meeting requirements at a more economical price. The powder coating offers excellent rust and corrosion resistance, resisting moisture and dust in daily environments. Its durability is fully suitable for outdoor, workshop, and other conventional working conditions.
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Flexible Installation & Strong Versatility
Supports multiple installation methods, with interface threads covering NPT, BSP, and ZG specifications. It directly matches oxygen cylinder valves, oxygen supply pipelines, and welding equipment without additional adapters. Its compact, lightweight design suits both fixed installation and temporary calibration.
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Low Maintenance Costs
Simple structure with few vulnerable parts — daily maintenance only requires periodic accuracy calibration. In case of failure, part replacement costs are far lower, making it ideal for mass instrument configuration scenarios such as welding & cutting, gas cylinder filling, and medical oxygen supply stations.

Typical Application Fields

🏥 Medical Oxygen Supply
Hospital central oxygen supply and oxygen cylinder pressure display to ensure safe oxygen supply.
🏭 Chemical / Metallurgical
Pressure measurement of oxygen pipelines, reaction vessels, etc., adaptable to industrial production processes.
🔴 Cylinder Filling
Pressure monitoring and control during oxygen filling to ensure filling safety.

Frequently Asked Questions

Q What makes this oxygen pressure gauge different from a standard pressure gauge?
This gauge is specifically designed for oxygen service. All internal components — including the Bourdon tube, movement mechanism, and brass connectors — undergo strict oil-free/degreasing treatment. This prevents any contact between grease and high-pressure oxygen, which could otherwise cause combustion or explosion. Standard pressure gauges do not meet this safety requirement for oxygen applications.
Q What thread types and connection locations are available?
The gauge supports a wide range of thread standards including NPT, BSP (G/PF), PT (BSPT/ZG), in sizes 1/8", 1/4", 3/8", and 1/2". Connection locations include Lower, Center Back, and Lower Back, providing flexibility to fit most oxygen cylinder valves, pipelines, and welding equipment without additional adapters.
Q What sizes are available and how do I choose the right one?
Available dial sizes are 40mm (1.5"), 50mm (2"), 60mm (2.5"), 75mm (3"), and 100mm (4"). Smaller sizes (40–50mm) suit compact or portable applications, while larger sizes (75–100mm) are recommended for panel mounting or environments where readability from a distance is important.
Q Is this gauge suitable for outdoor or harsh industrial environments?
Yes. The black iron powder-coated steel case provides excellent resistance to rust, moisture, and dust corrosion. This makes the gauge well-suited for outdoor installations, workshops, welding stations, and other industrial environments where exposure to the elements is a concern.
Q What are the typical application scenarios for this gauge?
This oxygen pressure gauge is widely used in medical oxygen supply systems (hospital central oxygen and cylinder monitoring), chemical and metallurgical oxygen pipelines and reaction vessels, and industrial cylinder filling stations. Its versatile thread compatibility and compact design make it adaptable across all these sectors.
Q How do I maintain this pressure gauge and what are the maintenance costs like?
Maintenance is straightforward due to the simple internal structure and minimal number of wear parts. Routine upkeep involves periodic accuracy calibration. In the event of a component failure, replacement parts are readily available and cost-effective, making this gauge an economical choice for large-scale deployments such as welding operations, filling stations, and medical facilities.

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