OEM China SF6 Gas Density Monitor: Reliable Leak Detection System from Leading Suppliers & Factory Manufacturer, Factory

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The SF6 Density Monitor is a highly accurate instrument designed for monitoring the density of SF6 gas in high-voltage electrical equipment. This essential device features automatic temperature compensation, dual alarm, and lockout functions, making it suitable for a wide range of applications including GIS, circuit breakers, and transformers. As reliable suppliers in the industry, we understand the critical role of SF6 gas in high-voltage power systems due to its exceptional dielectric strength and thermal stability.

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In the electrical industry, SF6 gas is widely used as both an insulating and arc-quenching medium, especially in switchgear, transformers, and gas-insulated substations (GIS). Any leakage or pressure drop of this gas can severely compromise insulation performance, leading to equipment failures. Therefore, continuous monitoring of SF6 gas density, rather than just pressure, is vital for ensuring the safe and reliable operation of high-voltage systems. Our factory produces SF6 density monitors that continuously track gas density to mitigate risks.

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To effectively address temperature-induced pressure fluctuations, our modern SF6 density relays come equipped with bimetallic temperature compensation mechanisms. This ensures that the displayed value accurately reflects the equivalent pressure at 20°C, regardless of varying ambient conditions. Trust our factory in China for high-quality SF6 density monitoring solutions tailored to your electrical equipment needs.

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Product Description

Product Specifications
Nominal size: 63mm
Scale range: -1 to 1 bar (customized)
Accuracy: 20℃: Class 1.0 or 1.6  |  -20℃ to +60℃: Class 2.5  |  -30℃ to -20℃: Class 3.0
Degree of protection: IP65
Ambient conditions: -30℃ to +60℃
Leakage rate: < 1×10⁻⁹ Pa·m³/s (Helium mass spectrometer)
Pressure connector: G1/4", NPT 1/4", M20×1.5 (customized)
Location: Center back
Electrical connection: Compact pluggable box with M20×1.5 cable gland
Cable size: 1.5mm² recommended; 2.5mm² maximum
Insulation properties: Insulation resistance >100 MΩ (500V DC); Withstand voltage 2kV, 50/60 Hz 1 min (to case)
Contact type: Pointer driven magnetic snap action signal contacts; 80% Ag, 20% Ni, 10μm Au plated
Contact ratings: 30W / 50VA, 1A max; 220V DC / 380V 50/60Hz max
Window: Safety glass
Weight: 0.5 KG
Core Characteristics & Advantages
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Temperature Compensation
Automatically adjusts for thermal effects using bimetal strips or digital sensors, providing stable readings at varying temperatures.
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Dual Set Points
Configurable alarm and lockout contacts trigger signals when gas density drops below preset thresholds, enabling timely maintenance or system shutdown.
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Robust Design
Available in all-stainless steel construction with optional oil filling for enhanced shock and vibration resistance.
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Remote Monitoring Capability
Models with wireless transmission (e.g., LoRa) or RS485 output support integration into smart grid systems for real-time data access.
Typical Application Fields
High-Voltage Circuit Breakers Monitors SF6 levels during operation and triggers lockout if density falls below the safety threshold.
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Gas-Insulated Switchgear (GIS) Ensures long-term integrity of sealed compartments exposed to outdoor environments.
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Transformers & Instrument Transformers Protects against internal faults caused by gas loss.
Frequently Asked Questions
Q What is the accuracy class of this SF6 density monitor at room temperature?
At 20℃, the monitor achieves Class 1.0 or Class 1.6 accuracy. Over the extended range of -20℃ to +60℃, accuracy is Class 2.5, and from -30℃ to -20℃ it is Class 3.0.
Q What pressure connection options are available?
The monitor supports G1/4", NPT 1/4", and M20×1.5 pressure connectors. Custom configurations are available upon request to match your specific installation requirements.
Q How does the temperature compensation feature work?
Temperature compensation is achieved through bimetal strips or digital sensors that automatically correct for thermal effects, ensuring accurate and stable SF6 density readings across a wide range of ambient temperatures (-30℃ to +60℃).
Q Can this monitor be integrated into a smart grid or remote monitoring system?
Yes. Select models feature wireless transmission (e.g., LoRa) or RS485 output, enabling seamless integration into smart grid platforms and SCADA systems for real-time remote data access and monitoring.
Q What is the leakage rate specification, and how is it tested?
The leakage rate is less than 1×10⁻⁹ Pa·m³/s, verified using a Helium mass spectrometer — one of the most sensitive leak detection methods available — ensuring superior gas-tight performance in critical applications.
Q What are the dual set point contacts used for?
The dual set point contacts provide configurable alarm and lockout signals. When SF6 gas density drops below preset thresholds, the contacts trigger alerts or system shutdowns, allowing operators to perform timely maintenance and prevent equipment failure.

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