SF6 leakage alarm systemMainly used in 35KV SF6 switch rooms and 500KV, 220KV, and 110KV GIS rooms in substations, for real-time monitoring of SF6 gas leakage and oxygen content in the air in SF6 combination electrical equipment rooms.
When SF6 gas leakage occurs, due to its density being more than 5 times that of air, SF6 gas accumulates in the lower space and causes local oxygen deficiency, leading to major accidents. This system adopts multiple sets of new high-sensitivity imported SF6-O2 sensors and temperature and humidity sensors. When there are small changes in the concentration of SF6 and O2 indoors, the sensors can immediately respond to these changes, even if the SF6 concentration is at 10ppmv, it can effectively monitor. The concentration change monitored by the sensor is converted into a 485 communication digital signal through a transmitter, A/D module, 485 communication module, and microcontroller control. The signal is sent to the main controller through the on-site RS-485 bus for data processing and storage, as well as determining whether to alarm, start the fan, and perform remote communication functions.

1. Based on the principle of sound velocity, it has high accuracy, long lifespan, and good stability.
2. Quantitative measurement display within a wide range of 0-30000ppmv, pioneering in China.
3. Verified by multiple power research institutes and metrology institutes.
4. The system has automatic correction function, effectively overcoming the influence of environmental factors such as temperature and humidity.
5. Multi channel switch, analog output, seamlessly integrated with the integrated automation system.
6. Optional wireless alarm function
7. Optional monitoring of toxic gas content (such as CO, CH4, H2S)
8. Optional external input signal interface, input signals can come from smoke probes, door magnetic switches, etc
9. Optional output interface, realizing numerous intelligent control functions such as automatic 119 fire alarm, start/stop dehumidifier, electric control door, etc
10. Optional digital SF6 density relay combined with networking to form a comprehensive SF6 gas leakage monitoring system
11. Optional remote network for monitoring system operation status, directly controlling the operation of the host or transmitter

Advanced testing principles
The system adopts the principle of sound velocity, which can quantitatively and real-time measure the SF6 leakage gas content online, overcoming the shortcomings of traditional measurement methods such as negative corona discharge method and halogen sensor method that can only qualitatively determine whether it exceeds the limit, and can accurately obtain the SF6 content in the gas.
high reliability
The system adopts a double differential processing method, effectively overcoming the influence of temperature and humidity on measurement results and eliminating the defects of traditional products.
Curve analysis function
Monitoring software can analyze the trend of SF6 gas content changes through curve analysis, effectively grasp the status of operating equipment, and truly play a warning role, which traditional qualitative products cannot achieve.
Multi detection function
It mainly detects SF6 gas leakage and oxygen deficiency, and has auxiliary detection functions for temperature, humidity and other environmental data, fully complying with the requirements of the "Electricity Safety Work Regulations".
Early on-site alarm technology
Micro detection technology can issue early on-site alerts, indicate the location of gas leaks, promptly notify personnel in hazardous areas to evacuate, search for and eliminate leakage sources, and protect operating equipment.
Fieldbus Design
One cable connects all collectors and hosts, which can be separated or combined, and has high on-site adaptability.
Multi point network detection
Up to 128 points can be detected simultaneously to meet the needs of the on-site environment and improve the reliability of detection.
Remote telemetry and control
The system has a standard interface at the outermost part, and data can be transmitted to the remote control center through RTU. The control center can also directly query and control the system remotely, achieving telemetry and remote control functions.
monitoring software
Optional, with functions such as data configuration, graphic configuration, curve analysis, data reporting, and historical data query.
Long life design
Fully utilizing the flexibility of the microcontroller, the sensor adopts intermittent working measurement, greatly improving the stability and service life of the sensor.
Historical data recording and querying
The host is equipped with a large capacity data storage, which can store data for 2 years and can be quickly queried through peripherals such as laptops.
Infrared monitoring function
Optional, the detection staff enters the work area, and automatic voice prompts real-time detection results, enhancing the intuitive feeling of on-site staff.
Maintenance free design
Dedicated electrical design, with no adjustable components in the entire machine, high-quality and guaranteed component selection, and excellent anti-interference performance.
SF6 measurement indicators
Measurement range: 0-30000ppmv
Alarm point: can be set within the measurement range, default 1000ppmv
Reference error: ± 5% FS
Repetitive error:< 5%FS
Zero drift:< 5%FS
Range drift:< 5%FS
Oxygen measurement indicators
Detection concentration: 0-25%
Oxygen concentration alarm point: 18%
Oxygen measurement accuracy:< 0.4%, O2 at 21%
Other indicators
Temperature measurement range:- 25℃ ~ +99℃
Humidity measurement range: 0～99%RH