Application of gas concentration detection and monitoring system in underground garage
In October 2016, we cooperated with a company from Shenzhen Gongming to complete a carbon monoxide CO gas concentration monitoring project in an underground garage of 12,000 square meters. The concentration of carbon monoxide CO gas in the air in a certain space is too high, which will affect human health. Nausea and vomiting, unable to act Therefore, the state requires the relevant enterprise factories to install carbon monoxide gas concentration detection alarms, and regularly ventilate to ensure that the carbon monoxide concentration in the garage is below the hazard level. Design a gas detector with the number of fire prevention zones to comprehensively detect the carbon monoxide concentration value in the underground garage. The gas detector is connected to the controller via a cable. The controller can display the concentration values of each monitoring point centrally. When the CO concentration in the environment exceeds a preset alarm value, it can automatically alarm and automatically start the exhaust system for replacement. If the carbon monoxide concentration is too high, the fan will be started for exhausting.The alarm value can be set freely.The alarm value is recommended to be set at 30PPM.
Working process of carbon monoxide gas detection alarm:
The carbon monoxide detection and alarm system in the air is to solve the safety problem in public places / factories. The carbon monoxide detector detects the carbon monoxide gas content in the factory, analyzes the data, converts the circuit, and packs it. Then it is sent to the control via RS485 or 4-20mA bus / break line. On the system, there is a control system to the central monitoring computer for analysis, displaying the carbon monoxide concentration in a curve and data mode, alarming when the limit is exceeded, and storing and managing related historical data. The monitoring room records and analyzes the carbon monoxide gas concentration value in the factory.
The carbon monoxide detector will detect the carbon monoxide concentration in the factory and transmit it to the control system. Once the carbon monoxide concentration in the factory reaches the upper limit alarm value, the control system will issue an audible and visual alarm and output a high limit alarm signal to start the exhaust fan or now monitor the safety personnel Take more effective measures to reduce the carbon monoxide concentration at the site. If the carbon monoxide concentration detection instrument detects that the gas concentration continues to rise and reaches the high limit alarm value, the control system will output a high limit alarm signal (pulse signal) to activate the tight shut-off solenoid valve and cut off the gas source; The carbon monoxide gas detector can be directly connected to an exhaust fan with a power of ≤200W. To connect to a fan with a power> 200W, a 220V AC contactor is required.
The on-line carbon monoxide concentration detector SK-600-CO is fixed. The product description and technical parameters are as follows:
On-line carbon monoxide gas detector, suitable for real-time and accurate detection of carbon monoxide gas concentration and leakage in various environments. Shenzhen Dongri Energy Technology Co., Ltd. uses imported electrochemical sensors, with fast response speed, high accuracy, good stability and repeatability. . Explosion-proof wiring method is suitable for various hazardous locations, and is compatible with various control systems PLC, DCS, host computer, etc., can also realize on-site alarm early warning, 4-20mA / RS485 standard signal output, relay switch output; perfect display of each Technical indicators and gas concentration values; at the same time, it has a variety of strong circuit protection functions, effectively preventing various human factors, instrument damage caused by uncontrollable factors;
Detection gas: CO concentration in air
Detection range: 0-1000PPM, 2000PPM, 5000PPM, (more ranges can be customized according to requirements)
Display mode: LCD display
Temperature and humidity: optional, temperature detection range: -40 ～ 60 ℃, humidity detection range: 0-100% RH
Detection method: diffusion type, flow type, pump type optional
Detection accuracy: ≤ ± 3% Linear error: ≤ ± 1%
Response time: ≤20 seconds (T90) Zero drift: ≤ ± 1% (FS / year)
Recovery time: ≤20 seconds Repeatability: ≤ ± 1%
Signal output: ① 4-20mA signal: standard 16-bit precision 4-20mA output chip, transmission distance 1Km
② RS485 signal: using standard MODBUS RTU protocol, transmission distance 2Km
③ Voltage signal: 0-5V, 0-10V output, can be set by yourself
④ Pulse signal: also known as frequency signal, adjustable frequency range (optional)
⑤ On-off signal: Standard 2 groups of relays, optional third group of relays, passive contacts of the relay, capacity 220VAC 3A / 24VDC 3A
Transmission method: ① Cable transmission: 3 core, 4 core cable, long distance transmission (1-2 km)
② GPRS transmission: can be built-in GPRS module, real-time remote transmission of data without distance limitation (optional)
Receiving equipment: user computer, control alarm, PLC, DCS, etc.
Alarm method: live sound and light alarm, external alarm, remote controller alarm, computer data acquisition software alarm, etc.
Alarm settings: Standard configuration of two-level alarm, optional three-level alarm; alarm modes can be set: conventional high-low alarm, interval control alarm
Electrical interface: 3/4 ″ NPT internal thread, 1/2 ″ NPT internal thread, and supports 2 electrical connection methods
Explosion-proof mark: ExdII CT6 (Explosion-proof type) Housing material: Die-cast aluminum + sandblasted oxidation / fluorocarbon paint, explosion-proof and anti-corrosion
Protection level: IP66 Working temperature: -30 ～ 60 ℃
Working power: 24VDC (12 ～ 30VDC) Operating humidity: ≤95% RH, non-condensing
Dimensional weight: 183 × 143 × 107mm (L × W × H) 1.5Kg (net weight of the instrument) Working pressure: 0 ～ 100Kpa
Standard accessories: instruction manual, certificate of conformity, warranty period of 3 years
Product description of gas control host SK-6200:
The gas controller samples the digital signals generated by the gas detector, and after processing the data from the internal single-chip microcomputer, it can display the detector's concentration, status (sound and light alarm) physical address and other information in real time, and output control signals. It has perfect faults Self-test function, real-time display of the fault location and type of the system and sub-address (sound and light alarm). The controller can control multiple detectors, using high-performance processors, can complete the communication alarm within 2S. The controller detects each detection The device can set 2 alarm points. One channel alarm output can be set. The controller can record 1050 records. The records include detection alarm, communication barrier, and detector barrier.
The design of this product follows the national standard of GB16808-2008. Compared with traditional products, it has new functions such as clock display, alarm time checking, independent setting, etc., and the system has a beautiful appearance, intuitive display interface, high definition, and each function is operated. With corresponding icons, the operation is very simple. The entire product design adopts centralized control, which is easy to query and maintain.
SK-6200 main features:
1. High measurement accuracy: The controller's CPU uses high-speed high-end single-chip microcomputers, with fast calculation speed, high accuracy, and strong reliability, and can quickly and accurately process system tasks to ensure system reliability;
2.System design: The system adopts modular structure design, which is convenient for system maintenance and processing.
3. Mixed configuration: to achieve a mixed configuration of flammable and toxic gas detectors in the same system.
4.Easy installation: The installation is extremely simple and the operability is strong.
5. Analog signal output: RS485 digital current signal can be output, 4 groups of alarm passive relay contact signal output (switching signal)
6.Easy maintenance: The entire product design adopts modular structure design, which is convenient for system combination and maintenance.
7.Display mode: LCD Chinese character liquid crystal display.
8. Control system: The fan and solenoid valve can be turned on automatically.
9. Number of connected detectors: up to 99 detectors can be controlled.
The gas alarm cannot be installed in the following locations
1. Places directly affected by steam and oil fume;
2. Places with large air flow, such as air inlets, ventilation fans, and room doors;
3. Where there is a lot of water vapor and water drops;
4. Places subject to shock, vibration and strong electromagnetic field interference;
5. Where the temperature is below -40 ° C or above 70 ° C;
6. The gas detector and the controller are connected by a three-core cable, with a diameter (1.5 / 2.0 mm2) and a transmission distance (1200/1500 m)