YH6000 series SF6 gas leakage quantitative alarm systemIt is an intelligent online detection system designed and developed to provide personal health and safety protection for workers in distribution equipment rooms equipped with SF6 equipment, based on the current emphasis on safety production in the power system.
The system mainly detects the SF6 gas content and oxygen content in the ambient air. When the SF6 gas content in the environment exceeds the standard or is deficient in oxygen, it can give an alarm in real time, and automatically turn on the ventilation fan for ventilation. It also has many rich functions such as temperature and humidity detection, working status voice prompts, remote alarm, and historical data query.
The system adopts the principle of sound velocity and can measure SF6 concentration in real-time and quantitatively, even at SF6 concentration of 50ppm (v/v), it can effectively detect. Not only can it achieve the goal of ensuring personal safety, but it can also ensure the normal operation of equipment; Original imported high stability ultrasonic sensors and oxygen sensors can provide more reliable protection for on-site workers.
This system can be widely used in SF6 switchgear rooms, SF6 switch rooms, combination electrical rooms (GIS rooms), SF6 main transformer rooms, etc. of various voltage levels.

Quantitative detection function for SF6 gas content in the environment
SF6 gas content exceeding the standard alarm function.
● Oxygen content detection function in the air.
● Oxygen deficiency alarm function.
● Oxygen deficiency or excessive SF6 content, forced exhaust function.
Manually set alarm points.
● Temperature and humidity detection display function in the environment.
● Timed exhaust function.
● Fixed point collection function.
● Manual forced exhaust function.
● Last exhaust time display function.
Real time display of various parameter functions.
● SF6 and O2 content curve analysis function.
● Data reporting function.
● Historical data query function.
Infrared detection prompt function.
● Optional wireless alarm function
● Optional monitoring of toxic gas content (such as CO, CH4, H2S)
● Optional external input signal interface, input signals can come from smoke probes, door magnetic switches, etc
● Optional output interface, realizing many intelligent control functions such as automatic 119 fire alarm, start/stop dehumidifier, electric control door, etc
● Optional digital SF6 density relay combined with networking to form a comprehensive SF6 gas leakage monitoring system
● Optional remote network for monitoring system operation status, directly controlling the operation of the host or transmitter

1. 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.
2. 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.The system has been tested and found to be safe in accordance with the requirements of the "JJG 914-1996 Verification Regulations for Sulfur Hexafluoride Leak Detectors"!
Security:The system adopts a 24V DC power supply to each acquisition point, avoiding the use of 220AC power supply by other systems and ensuring the safety of the system.
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 alarms, indicate the location of gas leaks, promptly notify personnel in dangerous 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:A single substation can detect up to 128 points simultaneously, meeting the needs of the on-site environment and improving the reliability of detection.
Remote monitoring function:The system adopts MODBUS communication protocol, which can transmit data to the remote control center. With years of experience in safe operation, the system is stable and has good scalability. It has functions such as data configuration, graphical configuration, curve analysis, data reporting, and historical data query.
Multiple communication methods:Remote communication can use various communication media, including fiber optics, Ethernet, etc.
Alarm record query:The host is equipped with a large capacity data storage, which can store multiple records for easy querying.
Historical data recording and querying:The host is equipped with a large capacity data storage, which can store a large amount of measurement data.
Infrared monitoring function(Optional) When the detection staff enter the work area, automatic voice prompts will be given for 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.

The YH6000 series SF6 gas leakage quantitative alarm system mainly consists of four parts:Collector, system host, peripheral devices, and monitoring system.The collector is responsible for collecting on-site environmental data from SF6 distribution equipment rooms, performing A/D conversion, and transmitting it to the system host. The system host analyzes, compares, and judges the collected data, and runs corresponding processing programs. Peripheral devices include alarm devices, ventilation devices, and are controlled by the system host.
When the concentration of SF6 gas or oxygen content in the environment changes, the SF6 gas collector can immediately capture this change and convert the detected change data into digital signals, which are transmitted to the system host through the RS-485 fieldbus. On the one hand, the system host displays the collected data from the collector on the display screen, and on the other hand, through calculation and analysis, compares it with various inherent parameters stored in the host's memory to make a judgment - whether each data exceeds the standard.
When the SF6 concentration is higher than the alarm set value (required by regulations to be 1000ppm, this system can set it by itself) or the oxygen content is lower than the alarm set value by 18%, the system host will automatically sound and light an alarm, and start the fan for ventilation, and upload an alarm signal to the remote control.

According to the different roles played by each product component in the system, the entire system equipment can be divided into:System host, collector, peripheral devices, and upper PCFour parts. The following is an explanation of product selection and design based on the above classification.
1. YH6000 system host

The YH-6100 system host receives the data transmitted by the collector, displays it synchronously, analyzes and processes it, and makes a judgment after comparing it with fixed standard parameters. When the collected data exceeds the set limit, the host automatically runs various control programs and starts peripheral devices to work, including sound and light, voice alarm, ventilation, etc. In addition, the host can measure the temperature and humidity of the environment on its own in order to compensate and correct relevant data.
Installation method: wall mounted
Maximum number of collector connections: 128 (adjustable according to user needs)
• Dimensions: 80 × 270 × 400 (mm)
Alarm output mode: normally open contact (passive)
• Features: Simple and beautiful appearance, rich control functions. LCD display for on-site monitoring of environmental data, with forced fan exhaust, automatic start of fan exhaust in case of alarm, and remote alarm output. Alarm points can be set through the host's built-in function keys, fan timed exhaust function, and historical data can be viewed.

YH-6200 SF6 gas and oxygen gas collector

Equipped with SF6 gas and oxygen gas sensors, it detects the SF6 gas and oxygen content in the environment, collects data, and directly transmits it to the system host for display, analysis, and processing.
Installation method: fixed in the low position area where SF6 gas is prone to leakage
• Dimensions: 40 × 90 × 260 (mm)

3. YH-6300 Temperature and Humidity Collector

Equipped with temperature and humidity sensors, it detects the temperature and relative humidity in the environment, and collects data directly transmitted to the system host for display, analysis, and processing.
Installation method: Fixed in the same environment as the YH-8200 SF6 gas and oxygen gas collector
• Dimensions: 40 × 90 × 260 (mm)

4. YH-6400 monitoring system (reserved interface in the background)

Data collection and processing functions;
Event alarm function;
Accident recall function;
Data reporting function;
Equipment information management function.

5. YH-6500 Fan Controller

Function: Accept fan control signals from the host and control the start and stop of single-phase (AC220V) fans.
• Control power: 220V, 20A
• Dimensions: 160 × 200 × 400 (mm)

6. YH-6600 type alarm light

Component composition: JD701-L03R/22 alarm light emitting tube
B01 wiring socket
C-3 installation base
A01 Decorative Cover