Factory boundary gas VOCs online monitoring system manufacturer Fixed pollution source VOC total TVOC benzene online monitoring system Environmental Protection Bureau networking

The CMS-6000 Fixed Source Volatile Organic Gas Online Monitoring System is a data collection system for environmental monitoring of volatile organic compound emissions. It provides real-time monitoring of waste gas emissions and the operation of environmental protection facilities generated by factories, mines, enterprises, and other units, thereby providing an effective means for environmental monitoring and management departments to centrally manage these emission points. The environmental monitoring information center communicates with pollution source monitoring points through a network, with multiple network options available (such as the Internet, wireless transmission, fiber optic private network, etc.).

The CMS-6000 fixed source volatile organic gas online monitoring system consists of modules such as a simple flue gas sampler, imported PID online monitoring equipment, wind speed transmitter, analysis cabinet pretreatment system, gas analysis detector, data acquisition and processing, and data transmission.

PID photoionization detection technology

Using a vacuum ultraviolet lamp to generate ultraviolet light, gas molecules are bombarded in an ionization chamber to ionize and break down organic molecules contained in the gas into positively charged ions and negatively charged electrons. Under the action of the electric field on the electrode plate, the ions and electrons collide with the electrode plate, forming weak current signals. These current signals are processed by circuits and data acquisition, and finally converted into displayed concentration values and other parameters. The following figure is a schematic diagram of PID photoionization detection technology.

Schematic diagram of PID photoionization detection technology

technical indicators

Project Execution Standards

GB50493-2009 "Design Specification for Combustible Gas and Toxic Gas Detection and Alarm in Petrochemical Enterprises"

HG/T2359-92 "Electrochemical Hazardous Gas Detection and Alarm Device"

GB12358-2006 General Technical Requirements for Workplace Gas Detection and Alarm Devices

GB15322.1-2003 "Combustible Gas Detectors Part 1: Point type Combustible Gas Detectors with a Measurement Range of 0-100% LEL"

GB3836.1-2000 "Electrical equipment for explosive gas atmospheres - Part 1: General requirements"

GB3836.2-2000 "Electrical equipment for explosive gas atmospheres - Part 2: Explosion proof type" d ""

Technical Features

Intelligent PID sensor, using intrinsic safety technology, can support multi gas and multi range detection

L No need to open the lid, infrared remote control operation, single person maintenance

Local alarm indication, integrated sound and light alarm (optional)

High measurement accuracy and good stability

The instrument has over range and reverse polarity protection, which can avoid the danger caused by improper human operation.

Built in multiple high-performance processors, using high-speed data bus communication technology between processors, each module has powerful digital configuration and detection functions; Easy to operate and convenient to use

Rich user interface that can be easily integrated into various control and monitoring systems. Wireless or wired networks can be established through communication methods such as RS485 and RS232instrumentProvide convenience for daily operation, maintenance, and management

Equipment Composition

List of Single Set Configuration for CMS-6000 Online VOCs Continuous Monitoring System

Composition of volatile organic compound online monitoring system

The volatile organic compound online monitoring system continuously monitors the total VOC emissions from pollution sources. Provided a monitoring and early warning system for environmental emergency monitoring, ensuring personal and production safety, and providing data support for evaluating existing volatile organic compound pollution control technologies.

Equipment pictures (for reference only, subject to the actual product)

System Composition

The system consists of a sampling unit, a preprocessing unit, and an analysis unit.

Sampling unit: composed of sampling pipeline and blowback system, etc.

Preprocessing unit: composed of fine filters, sampling pumps, and flow meters.

Analysis Unit: Adopting PID photoionization gas detection alarm, high accuracy, good reliability, and low maintenance cost.

Sampling and preprocessing unit

The sample gas is taken out by the sampling probe under the pumping force of the sampling pump. The vast majority of particulate matter in the sample gas is filtered out by the filter in the sampling probe, and then transported by the heat tracing pipeline to the refrigeration system for condensation and water removal, and sent to the analysis unit for analysis. The condensed water is discharged through the drainage system. The control unit implements functions such as blowback, calibration, refrigeration temperature alarm prompt, and displays various working states of the system.

In the preprocessing system, a first stage rapid condensation is used to remove water, ensuring that the gas composition remains unchanged. Adopting secondary fine filtration ensures that the gas measurement chamber is not contaminated, thereby improving the service life of the analyzer. The following figure is the flowchart of the gaseous pollutant monitoring system.

Preprocessing system

The preprocessing system consists of:

Sampling unit (probe, filter);

Preprocessing unit (sampling pump, dehumidification, fine filtration, drainage, etc.);

Analysis unit (VOCs);

Signal output (VOCs concentration, calibration status, fault status, etc.);

Other (gas path, circuit, etc.);

Analytical instrument cabinet: customized

VOCS online continuous monitoring analyzer

Instrument: VOCs gas analyzer

Measurement principle: PID photoionization detection principle

Measuring principle

PID uses a ultraviolet (UV) light source to ionize organic molecules into positive and negative ions that can be detected by a detector (ionization). The detector captures the positive and negative charges of ionized gas and converts them into electrical signals to measure gas concentration. When the gas being tested absorbs high-energy ultraviolet light, the gas molecules temporarily lose electrons and become positively charged ions due to the excitation of ultraviolet light. After being detected on the electrode of the detector, gas ions quickly combine with electrons to recombine into the original gas and vapor molecules. PID is a non-destructive detector that does not alter the molecules of the gas being tested, and the gas detected by PID can still be collected for further measurement.

technical indicators

NO: 0-50mg/m ³ (can be customized according to the buyer's needs)

Accuracy: ± 2%

Linear error: ≤± 2% F.S

Zero drift: ≤± 2% F.S./7D

Range drift: ≤± 2% F.S./7D

Response time: ≤ 30s

other

Power supply: 24VDC

Environmental temperature limit: -10~50 ℃

Communication interface: 4-20mA/RS485

Analog switch: 2-channel relay output

Alarm method: Sound and light alarm

Instrument features

Large dot matrix LCD display, supporting both Chinese and English interfaces

Intelligent EC sensor, using intrinsic safety technology, can support multi gas and multi range detection

No need to open the lid, infrared remote control operation, single person maintenance

High measurement accuracy and good stability

The instrument has over range and reverse polarity protection, which can avoid the danger caused by improper human operation.

Featuring international high-end quality

Built in multiple high-performance processors, using high-speed data bus communication technology between processors, each module has powerful digital configuration and detection functions; Easy to operate and convenient to use.

Rich user interface

Provide rich interfaces that can be easily integrated into various control and monitoring systems. Wireless or wired networks can be established through communication methods such as RS485 and RS232, providing convenience for the daily operation, maintenance, and management of instruments.

Technical parameters for data collection and processing

The data collection software system mainly implements the monitoring and alarm functions of the system. It mainly consists of a task management module, a data collection and communication module, a data processing and analysis module, a real-time alarm module, a graphic display and printing module, and a log recording module. It mainly completes the collection, communication, data analysis and display of multi-channel data, as well as the alarm of abnormal data. (As shown in the following figure)

This system can effectively detect, analyze, and alarm the concentration of VOCs gases. The program consists of multiple document interfaces, and the management interface, display interface, and database log query interface can be freely switched.

Data processing and analysis module

The data processing and analysis module is responsible for analyzing and processing data. The main functions include real-time data display, historical data query, alarm/fault record, linkage fault record, detector historical curve and other data analysis display. The main feature of this module is the use of optimized mathematical algorithms to quickly and accurately process data, and send the processed data to the alarm, display, printing, and log modules.

(1) Real time data display

The platform can display real-time VOCs monitoring data. Integrate the monitoring data of VOCs gas alarm probes into a unified platform for unified management, and comprehensively display the installation location, detection time, equipment status, measurement values, and measured substances. (As shown in the following figure)

(2) Historical data query

Simple statistical analysis can be conducted on the historical monitoring data of a certain point, which can visually view the changes in gas concentration during a certain period of time, helping the purchaser save manual analysis time and cost, and also helping the purchaser understand the basic pollution situation.

Update time: September 4, 2020 16:48:45