Continuous online SF6 gas concentration monitoring, oxygen depletion detection, real-time alarm management, and dew point & density surveillance for GIS substations, MV/HV switchgear rooms, and enclosed electrical installations — SCADA-integrated, factory-direct OEM manufacturer since 2011.
Sulfur hexafluoride (SF6) is a synthetic, inorganic gas universally used as a dielectric insulating and arc-quenching medium in gas-insulated switchgear (GIS), high-voltage circuit breakers, ring main units, and other MV/HV electrical equipment. Its dielectric strength is approximately 2.5 times that of air — enabling dramatic reductions in switchgear physical size. Despite being chemically stable and non-toxic in its pure form, SF6 presents two critical hazards that make continuous online monitoring a regulatory and operational necessity.
First, SF6 is significantly heavier than air (density 6.17 g/L vs. 1.29 g/L for air). Any gas leak accumulates silently at floor level in enclosed switchgear rooms — displacing breathable oxygen without odor, color, or any sensory warning. Personnel entering an SF6-contaminated room without monitoring face a life-threatening asphyxiation risk. Second, SF6 is 23,500 times more potent than CO₂ as a greenhouse gas, with an atmospheric lifetime of 3,200 years — making SF6 emissions a serious environmental and regulatory liability.
SF6 gas does not warn you before it becomes dangerous. It accumulates silently, insulates invisibly, and degrades equipment undetected — until a monitoring system catches it first.
SF6 gas is 5 times heavier than air. A breach in GIS equipment can flood a switchgear room floor with SF6 concentration in minutes. Oxygen drops below 18% — the mandatory evacuation threshold — without any detectable odor or visual cue. Only a fixed online SF6 gas monitoring system with automatic alarm triggers can reliably protect personnel working in or entering these enclosed spaces.
SF6 insulation performance is directly proportional to gas density inside sealed equipment compartments. A slow leak — too gradual to trigger a room alarm — progressively reduces gas density and dielectric strength, eventually resulting in insulation failure, arc flash, or catastrophic GIS breakdown. Online gas density monitoring inside the equipment provides early detection of developing leaks, weeks before critical insulation performance thresholds are reached.
SF6 gas moisture content (measured as dew point or trace moisture in ppmv) directly impacts arc-quenching performance and long-term insulation integrity. Moisture ingress — from seal degradation, maintenance error, or gas refilling procedures — accelerates SF6 decomposition into toxic by-products including HF and SO₂F₂. Online dew point monitoring detects moisture exceedance before equipment damage or hazardous decomposition products accumulate inside sealed GIS compartments.
SF6 is regulated as a potent greenhouse gas under the EU F-Gas Regulation, the US EPA GHG Reporting Program, and equivalent frameworks in Asia-Pacific and the Middle East. Operators of SF6-insulated equipment are required to demonstrate continuous leak monitoring, maintain SF6 inventory records, and report annual emissions. Failure to comply carries significant financial penalties — and continuous online monitoring is the most defensible compliance documentation method available.
Professional SF6 gas monitoring systems implement escalating alarm stages that trigger increasingly urgent protective responses — providing early warning time for orderly ventilation and evacuation before hazardous concentration levels are reached.
Visual LED indicator activates on monitoring display. Operations team is notified via SCADA alarm. Ventilation system inspection recommended. Personnel can continue working — no immediate danger, but trend monitoring required.
National standard alarm threshold. Audio siren activates. SCADA alarm relay triggers. Automatic ventilation forced-ON. Personnel evacuation from switchgear room required. Maintenance team dispatched to identify and isolate SF6 leak source.
Maximum emergency response. All access to switchgear room prohibited. Emergency ventilation maximum capacity. Oxygen depletion alarm simultaneously activates at 18% O₂. Immediate incident response protocol initiated. SCADA event log captures complete time-stamped event record for regulatory reporting.
The INNO SF6 Gas Leak Detection and Monitoring Alarm System is an intelligent online monitoring platform developed in accordance with state power corporation safety production regulations. Designed specifically for high-voltage GIS substations, switchgear rooms, power distribution facilities, and enclosed electrical equipment rooms — this system provides continuous environmental surveillance, real-time alarm notification, and full SCADA integration from a single centralized monitoring unit.
The system integrates SF6 gas concentration sensors, oxygen depletion monitors, temperature and humidity sensors, and an intelligent control unit into a unified environmental monitoring platform. A high-resolution 9.7-inch touchscreen (800×480) provides at-a-glance room status, multi-point sensor readings, historical trend data, and alarm management — with simultaneous RS485 Modbus RTU output for integration with any SCADA or DCS platform.
| Detection Parameters | SF6 concentration + Oxygen level + Temperature + Humidity |
| SF6 Detection Range | 0 – 3000 ppm (standard); extended range available |
| SF6 Alarm Thresholds | Pre-warning: 800 ppm · Primary: 1000 ppm · Critical: 1500 ppm |
| O₂ Alarm Threshold | 18% O₂ (oxygen depletion alarm) |
| Measurement Accuracy | ±2% FS (SF6 sensor); annual calibration recommended |
| Detection Technology | Infrared (NDIR) absorption — drift-resistant, long-life |
| Sensor Mounting Height | 20–30 cm above floor level (SF6 heavier than air) |
| Display Interface | 9.7-inch touchscreen, 800×480 resolution |
| Communication | RS485 Modbus RTU / IEC 61850 optional |
| Alarm Outputs | Multi-channel relay outputs; audio siren; visual LED |
| Automatic Ventilation Control | Yes — relay output for forced ventilation activation |
| Multi-Point Networking | GIS mapping with multi-room sensor network support |
| Data Logging | Historical trend data; event log for compliance documentation |
| Certifications | CE · RoHS · ISO 9001 · ISO 14001 · ISO 45001 |
The INNO Online SF6 Gas Dew Point & Density Monitoring System provides continuous condition monitoring of SF6-insulated electrical equipment from inside the sealed gas compartment. Unlike standalone dew point analyzers or mechanical density gauges, this integrated solution combines simultaneous trace moisture monitoring, gas density measurement, pressure, temperature, and relative humidity — in a unified online system with centralized data management and unified alarm processing for multiple measurement points.
The system installs a sealed sensing unit directly at the gas compartment of SF6-insulated equipment. An internal circulation design with zero SF6 gas emission ensures safe, environmentally compliant operation. Automatic temperature and pressure compensation maintains density measurement accuracy across the full operating temperature range. Suitable for SF6 equipment rated from 110 kV to 750 kV — covering SF6 circuit breakers, GIS, and AIS installations in substations and power plants worldwide.
| Monitored Parameters | Trace moisture (ppmv) · Dew point · SF6 density · Pressure · Temperature · Humidity |
| Applicable Equipment | SF6 circuit breakers · GIS · AIS · SF6-filled HV switchgear |
| Voltage Level | 110 kV to 750 kV |
| Sampling Technology | Internal circulation — zero SF6 gas emission |
| Compensation | Automatic temperature & pressure compensation |
| Sensor Design | Fully sealed, waterproof, dustproof, EMI-resistant industrial enclosure |
| Communication | RS485 Modbus RTU — synchronized multi-point monitoring |
| Data Management | Centralized — unified alarm processing for multiple points |
| Customization | Monitoring points, alarm logic, communication — all configurable |
| Application | Substations · Power plants · Industrial MV/HV installations |
SF6 gas monitoring is most effective when integrated with a broader GIS condition monitoring platform. INNO's complementary GIS partial discharge, cable PD, and cable sheath current monitoring systems cover every critical failure mechanism in gas-insulated and cable-connected power infrastructure.
Advanced UHF partial discharge detection for gas-insulated switchgear — 300–3000 MHz frequency range, 5 pC sensitivity, 4–6 channel simultaneous monitoring. Real-time identification of corona, surface, void, and floating potential discharge types. IEC 61850 / Modbus RTU / DNP3 SCADA integration. IP54 industrial enclosure rated to -40°C–85°C for harsh outdoor substation environments.
View GIS PD Monitoring System →
Real-time partial discharge monitoring for MV and HV power cables — high-frequency current sensors, 3D PRPD pattern analysis, and time-domain reflectometry for precise fault location along cable lengths. 90-day local data storage at full resolution. Detects insulation degradation weeks before catastrophic cable failure — reducing unplanned outages by up to 40%.
View Cable PD Monitoring System →
Continuous measurement of cable sheath grounding currents for high-voltage cable networks — detects sheath insulation faults, grounding system anomalies, and developing cable failures from sheath current aberrations. Optical isolation, adaptive filtering, and ±1% accuracy across the full -20°C to +85°C operating range. Integrates with fiber optic DTS temperature sensing for complete cable health correlation.
View Cable Sheath Monitoring System →From GIS transmission substations in Europe to urban distribution switchgear rooms in Asia and industrial power facilities in the Middle East — INNO SF6 gas monitoring systems deliver continuous, reliable protection across the most demanding electrical infrastructure environments.
A major German transmission system operator required a comprehensive SF6 gas monitoring upgrade for its 380 kV GIS substation following updated F-Gas Regulation compliance requirements. The facility housed 48 SF6 gas compartments across three switch halls, with personnel entering for maintenance operations on a weekly basis. Previous monitoring relied on annual manual dew point testing — insufficient for regulatory compliance documentation and inadequate for personnel safety during unscheduled access events.
INNO deployed online SF6 gas concentration monitors in all three switch halls, with floor-level sensors at each maintenance access point. Simultaneously, an online SF6 dew point and density monitoring system was installed at all major GIS bus section and circuit breaker compartments. RS485 Modbus RTU integration delivered real-time gas data to the operator's Siemens WinCC SCADA platform. During the first 6 months of operation, the system identified one GIS compartment with a slow density decline — enabling planned gas refilling and seal inspection before any operational impact occurred.
A major electricity distributor in Singapore required SF6 gas monitoring for its network of 200+ urban compact substations and ring main units — each housing SF6-insulated switchgear in confined underground vaults or equipment rooms. Localized SF6 gas accumulation in these enclosed spaces represented a critical personnel hazard during routine switching operations and cable joint maintenance, where staff access is frequent and work durations are extended.
INNO four-in-one transmitter units — simultaneously measuring SF6 concentration, oxygen, temperature, and humidity — were deployed at each substation location. A centralized network monitoring dashboard, integrated with the utility's distribution management system via Modbus RTU, provided real-time gas status for the entire 200+ substation fleet from a single network operations center screen. The deployment was completed across all substations in three months, with zero impact on network reliability during installation. The system has since generated zero false alarms and identified two genuine SF6 concentration events requiring ventilation intervention.
A major petrochemical complex in Saudi Arabia required an integrated GIS monitoring solution covering SF6 gas safety monitoring and partial discharge surveillance for its 132 kV GIS primary switchgear following a process safety review that identified gaps in electrical infrastructure monitoring. The facility's electrical maintenance team required both personnel protection during switchgear maintenance activities and condition-based maintenance capability to avoid forced outages from undetected insulation degradation in GIS compartments.
INNO deployed a combined SF6 gas monitoring and GIS partial discharge monitoring system covering all 24 GIS bays in two primary electrical substations. SF6 room monitors provided real-time personnel safety surveillance in both switchgear halls. Simultaneously, UHF partial discharge sensors were installed at each GIS compartment, with 3D PRPD pattern analysis enabling automatic PD type classification. The ABB System 800xA DCS integration via Modbus RTU delivered unified alarm management to the plant's central control room. Post-installation thermal correlation analysis from fiber optic monitoring at GIS cable terminations identified one developing hotspot during commissioning — which was remediated during the same outage window.
Share your switchgear room type, number of SF6 compartments, and SCADA platform — our engineers will design the right SF6 monitoring configuration for your requirements.
INNO SF6 gas monitoring and leak detection systems are engineered for every environment where SF6-insulated equipment operates — from transmission GIS substations to urban ring main units, data center primary switchgear and industrial power installations worldwide.
SF6 gas monitoring for 110 kV, 220 kV, 380 kV, and 750 kV GIS primary transmission substations — simultaneous room safety monitoring and online gas density/dew point surveillance of all sealed compartments. Multi-bay sensor networking with centralized control and IEC 61850 integration for digital substations. Satisfies EU F-Gas Regulation, national electrical safety standards, and insurer documentation requirements.
GIS Substation SF6 Monitoring →
Fixed SF6 gas leak detection for enclosed medium-voltage switchgear rooms in industrial facilities, commercial buildings, and utility distribution substations. Four-in-one transmitters cover SF6 concentration, oxygen, temperature, and humidity from a single installation point per monitoring zone. Automatic ventilation control relay output ensures immediate forced ventilation on alarm — protecting personnel who may not be aware of an SF6 leak event.
MV Switchgear Room SF6 Monitoring →
Data centers with SF6-insulated primary MV switchgear require continuous gas monitoring for personnel safety, environmental compliance, and Uptime Institute certification. INNO SF6 monitoring with IEC 61850 integration delivers real-time gas status directly to DCIM platforms — with complete event logging for audit documentation and insurer reporting requirements. Zero-emission density sensing ensures no SF6 is released during monitoring operations.
Data Center SF6 Monitoring Inquiry →
Urban compact substations and ring main units in confined underground vaults present elevated personnel risk from SF6 accumulation in restricted spaces. INNO miniaturized SF6 gas monitoring units with remote alarm transmission install without switchgear outage, providing continuous gas surveillance for utility distribution fleets at scale. Network-connected monitoring supports centralized control of hundreds of substations from a single network operations dashboard.
RMU SF6 Monitoring Inquiry →
Industrial facilities with MV and HV SF6-insulated switchgear in process-critical electrical installations require SF6 gas monitoring that meets both safety regulations and operational reliability requirements. INNO explosion-proof sensor options and ABB/Siemens DCS-compatible Modbus integration make our systems the preferred choice for petrochemical, oil refinery, and heavy industrial SF6 monitoring applications. Complete IQ/OQ documentation supports regulated industry deployment.
Industrial SF6 Monitoring Inquiry →
Wind farm collector substations and offshore grid connection facilities with SF6 GIS switchgear require remote SF6 monitoring with robust communication for unmanned operation. INNO systems with GSM/4G or fiber backhaul communication deliver continuous SF6 gas status to central SCADA platforms — enabling remote alarm response and SF6 inventory management for renewable energy portfolio operators. Deployed across 25+ wind farm substation fleets in Europe and Asia.
Renewable Energy SF6 Monitoring →INNO fiber optic and sensing systems cover every critical monitoring dimension of modern switchgear — from arc flash detection and thermal hotspots to partial discharge and gas leakage. One platform. One manufacturer. Complete protection.
Real-time monitoring of circuit breaker contact temperature, mechanical wear and thermal anomalies. Early fault warning reduces arc flash risk and extends equipment service life.
Learn More →Precisely detect thermal hotspots at busbar joints, cable terminations and contact points before faults develop. Enable proactive preventive maintenance and eliminate unplanned outages caused by thermal defects.
Learn More →Continuously track busbar temperature distribution and insulation degradation trends. Ensure reliable power transmission across main and sectional busbars with IEC 61850 / Modbus RTU SCADA integration.
Learn More →Real-time optical arc flash detection and precise fault zone location for millisecond-speed protective response. Effectively prevent arc flash incidents from causing severe damage to equipment and personnel.
Learn More →Real-time SF6 gas concentration, oxygen depletion, dew point and density monitoring for GIS switchgear and enclosed electrical rooms. Protect personnel, ensure regulatory compliance, and detect equipment leaks before insulation failure.
You Are Here →Comprehensive temperature measurement across all critical switchgear assets for early detection of overheating and proactive maintenance. Fiber optic sensors rated to 140 kV — fully suited for high-voltage environments.
Learn More →Continuous acquisition and analysis of partial discharge activity. Early identification of insulation defects through high-sensitivity UHF, TEV and ultrasonic sensors to reduce unplanned switchgear failures.
Learn More →A unified platform integrating temperature, arc flash, partial discharge, SF6 gas and mechanical condition monitoring into one dashboard. Multi-bay, multi-device visibility from a single system with full SCADA / IEC 61850 integration.
Explore Full Platform →Complement your SF6 gas monitoring with INNO's complete range of fluorescent fiber optic temperature monitoring systems — covering switchgear, transformers, generators, reactors, ring main units, and cable joints. Calibration-free for 25+ years, fully immune to electromagnetic interference, and SCADA-ready from one manufacturer.
Real-time fluorescent fiber optic temperature measurement for MV and HV switchgear contacts, busbars, cable terminations, and circuit breaker compartments. ±1°C accuracy, 1–32 channel capacity, RS485 Modbus / IEC 61850. Calibration-free 25+ year sensor service life. Ideal complement to SF6 monitoring for GIS contact temperature surveillance.
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Continuous fiber optic temperature sensing for low-voltage circuit breaker contacts, cable joints, and busbar connections inside box-type substation enclosures. Temperature range -20°C to +150°C, ±1°C accuracy. Non-intrusive contact measurement that does not affect substation insulation performance. RS485 output for remote monitoring integration.
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Embedded fiber optic temperature probes for direct hot-spot measurement within air-core and dry-type reactor windings. Provides continuous overtemperature protection and load management data — essential for reactors operating near rated current in GIS substation applications. Immune to the extreme electromagnetic fields generated by reactor operation.
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Comprehensive intelligent monitoring for dry-type transformers — simultaneous winding temperature, partial discharge, vibration, and insulation condition monitoring from a single integrated platform. Enables condition-based maintenance, real-time thermal protection, and SCADA-connected transformer health index reporting.
View Product →
Continuous winding and bearing temperature monitoring for standby and prime power generator sets. Fully immune to the strong electromagnetic fields and vibration environment of generator enclosures — providing reliable thermal protection that conventional NTC/PTC sensors cannot achieve in generator environments.
View Product →
Miniaturized fiber optic temperature sensor system for cable plug joints inside compact ring main unit enclosures — precisely the same RMU environments where SF6 gas monitoring is also required. Non-intrusive installation, IP66 rated, supports wireless LoRa communication for urban distribution substation fleet deployment at scale.
View Product →Founded in 2011 in Fuzhou, China, INNO Instrument — Fuzhou Innovation Electronic Science & Technology Co., Ltd. — is a vertically integrated manufacturer of SF6 gas monitoring systems, fluorescent fiber optic temperature sensors, arc flash detection systems, partial discharge monitoring platforms, and integrated online monitoring solutions for power infrastructure worldwide.
With over 15 years of in-house production of gas detection sensors, monitoring relay electronics, and monitoring software, INNO supports global switchgear OEMs, EPC contractors, power utilities, and system integrators with fully customized SF6 gas monitoring solutions. Our engineering team works directly with your design and procurement teams to deliver factory-calibrated, application-specific systems — ready to embed in your equipment from day one, with full OEM documentation, traceability records, and co-branding options.
Application-specific sensor geometries and enclosure designs for factory embedding in GIS switchgear panels and compact substation enclosures — designed to your dimensional and installation requirements.
Combined SF6 gas monitoring and fluorescent fiber optic temperature sensing in a single integrated platform — covering both environmental safety and thermal condition monitoring for complete GIS health surveillance.
Co-branded SF6 monitoring dashboards and alarm management interfaces configured to your brand identity, protocol stack, and customer-facing reporting and compliance documentation requirements.
Dedicated application engineering, FAT/SAT support, IQ/OQ qualification documentation packages, and ongoing post-deployment technical assistance for regulated and safety-critical industrial installations.
End-to-end in-house production — from gas sensor fabrication through monitoring electronics assembly, software development and final system integration — gives INNO the flexibility and traceability that global OEM partners require.
From utility GIS substations to industrial switchgear facilities — electrical professionals worldwide rely on INNO SF6 gas monitoring systems to protect their personnel, equipment, and environmental compliance programs.
We deployed INNO's SF6 gas monitoring system across our 380 kV GIS substation network following updated EU F-Gas Regulation compliance requirements. The four-in-one transmitter units — covering SF6 concentration, oxygen, temperature, and humidity — simplified installation significantly and the Modbus RTU integration with our Siemens SCADA was plug-and-play. The online dew point monitoring identified one compartment with developing moisture ingress during the first year. Highly recommended for any utility operating GIS infrastructure.
INNO SF6 monitoring systems are now our standard specification across all new substation builds and retrofits in our distribution network. The zero-emission sampling design on the density monitoring units was a key requirement for our environmental team. Integration with our ABB System 800xA took one day per substation. The sensor service life guarantee is exceptional — no annual replacement cost significantly improves the total cost of ownership compared to competing products we evaluated.
We selected INNO for our SF6 gas monitoring upgrade after comparing four manufacturers. The combined SF6 leak detection, online dew point, and GIS partial discharge monitoring capability in a single integrated system was what differentiated INNO. Installation across our 24 GIS bays was completed in nine days during a planned maintenance window. The IEC 61850 integration delivered real-time GIS health data to our control room immediately after commissioning. The engineering support throughout was outstanding.
INNO provided OEM-integrated SF6 monitoring modules for switchgear panels we supply to utility and industrial clients across Southeast Asia. The factory calibration quality, CE certification documentation, and complete type test reports met all our clients' procurement requirements without exception. The progressive 3-level alarm logic is well-designed — our clients' safety teams approved the alarm architecture immediately. INNO is now our standard OEM partner for integrated SF6 monitoring on all new GIS-equipped switchgear deliveries.
INNO's quality management system, products, and environmental practices are independently audited and certified to the highest international standards — providing procurement teams the documentation required for regulated power infrastructure applications worldwide.
Quality Management System — certified manufacturing and product quality control ensuring consistent, traceable production at every stage.
Environmental Management System — verified responsible environmental practices. Critical credential for SF6 monitoring solutions supplied to environmentally regulated facilities.
Occupational Health & Safety Management — certified safe workplace practices, directly aligned with the personnel safety mission of SF6 gas monitoring systems.
Information Security Management — certified data and intellectual property protection covering all OEM project and customer monitoring data.
European Conformity — all products comply with EU safety, health, and environmental protection requirements for deployment across the European Union and EEA, including F-Gas Regulation environments.
Restriction of Hazardous Substances — all products meet EU RoHS Directive requirements for restricted materials, supporting customer environmental compliance programs.
Have a question about SF6 gas monitoring for your specific installation?
Our application engineers respond within 4 hours. Share your switchgear room dimensions, number of SF6 compartments, and voltage level — we'll recommend the right SF6 monitoring configuration at no charge.
Share your switchgear room type, voltage level, and number of SF6-insulated equipment units — receive a custom SF6 gas monitoring system configuration, bill of materials, and quotation within one business day. Completely free, no commitment required.
Disclaimer: The technical specifications, case data and performance figures presented on this page are for reference only. Actual results may vary depending on installation environment, equipment condition and operating parameters. INNO reserves the right to update or modify product specifications without prior notice. Please contact us through official channels for formal quotations or technical confirmation.
