Overview
SK-7500-LEL-Y type LEL online monitoring system is an online monitoring system for continuous monitoring of organic matter LEL (lower limit of explosion) content in pipelines. The system integrates gas sampling, preprocessing, detection and analysis functions, and has functions such as real-time data transmission, report statistics, graphic data analytics and data export, which can realize unattended work site. The system has a simple structure, wide dynamic range, strong real-time performance, flexible networking, low operating cost, Modular design, convenient combination, and can meet the requirements of communication with the internal DCS system of the enterprise.
Features
1. Adopting pre-treatment design, the overall volume is small, the installation is convenient, and it can effectively cope with severe working conditions such as moisture, tar, and dust.
2. Using the original high-performance Sensor, long service life, good anti-interference performance, accurate and stable monitoring data.
3. Equipped with infrared remote control, full-function operation can be realized without opening the lid, and maintenance is convenient.
4. Standard 4-20mA, RS485 and a set of relay output signals, which can be easily connected to industrial control systems such as PLC and DCS or used as a stand-alone control.
5. Optional wireless modules such as DTU and LORA can be used to upload data to the enterprise DCS system or third-party platform in real time.
6. Optional 7-inch industrial touch display makes real-time concentration and Linear dispersion map display more intuitive and clear.
7. The system has intelligent Sensor, supports multi-gas, multi-range detection and customization, Sensor interchangeable, offline calibration and zero self-calibrating.
Principle
The system is mainly composed of a gas sampling subsystem and a gas component monitoring subsystem. The system uses active sampling to obtain clean, drying and constant sample gas after professional pretreatment such as filtrating, cooling and dehumidification, and then sends it to the Gas detection instrument for analysis. The detection instrument adopts the principle of infrared NDIR, which uses the absorption characteristics of different gas molecules to specific wavelengths of infrared light. According to Lambert-Beer's law, the gas component is identified and its concentration is determined by measurement of Absorption intensity, so as to realize continuous monitoring of the organic matter LEL content in the pipeline.
Applications
Generally used for RTO front-end pipeline monitoring, Petrochemicals, fixed pollution source emission monitoring, boiler smoke and dust testing, workplace environment Gas detection, air pollutant emission monitoring
Standards
GB3836.1-2010、GB3836.2-2010、GB 3836.15-2000、GBT50493-2019、GB12358-2006、GBZ 2.1-2007、GB 4208-2008、GB 16297－1996、GB/T 16157-1996、GB/T 5468-1991、HJ/T 397-2007、HJ/T 76-2017、HG/T 20507-2014
Steps
1. According to the sampling station selection point requirements, select the appropriate installation location.
2. Connect the AC220V power supply and signal output cable according to the system power supply and cable requirements.
3. If back flushing or heat tracing system is selected, connect the gas source or heat tracing pipeline as required.
4. When the system is powered on, the initial setting and parameter configuration are carried out through the display screen or infrared remote control.
5. Start the system, the sampling pump starts to work, and the sample gas enters the detector for analysis after pretreatment.
6. Monitoring data is displayed in real time and can be uploaded to the control system or platform through 4-20mA, RS485 or wireless modules.
7. Regularly calibrate zero points and target points through remote control or system functions.
Notice
* The sampling point should prioritize the vertical pipe section and the negative pressure area of the flue to ensure sample representativeness.
The installation location should avoid flue elbows and sharp changes in section. Please refer to the specific distance requirements.
The system power supply is AC220V, and the wiring must comply with the specifications.
It is recommended to use a Shielding cable for signal transmission cables. For long-distance transmission, thicker wire diameters are required and the Shielding layer is grounded.
* If the Back flushing function is selected, it is necessary to provide clean, oil-free and water-free instrument air, and the pressure and flow should be stable within the required range.
The system is suitable for pipeline working conditions with temperature ≤ 80 ° C, no or trace dust/water vapor, micro-negative pressure/normal pressure/positive pressure, and no explosion-proof requirements. More severe working conditions require special design.
* The equipment has requirements for vibration of the working environment, and attention should be paid when installing.
Maintenance can be carried out through the infrared remote control to avoid unnecessary opening of the lid.
* Sensor life is affected by the use and principle, and needs to be checked and calibrated regularly.
