Overview of the scheme:
The system is based on an open system architecture and is provided with system equipment (platforms) of other brands to realize the integration and information exchange through industrial standard communications, platforms and protocols, including MODBUS, TCP/IP and OPC.
The system consists of the combustible/toxic gas detectors installed on the site and the control unit, data acquisition module and workstation installed in the control room. Through the data acquisition module, the system will implement the data acquisition of the field detectors, and through the communication module, it will complete the communication between the operator station or the third-party system (equipment), receive relevant information and transfer the real-time data.
The combustible/toxic gas detector is used to detect various gases on the production site and convert the collected gas concentration into an analog signal. The data acquisition module will transmit the collected signal to the GDS control unit through the serial communication. The GDS control unit will compare the detected values with their respective upper/lower alarm limits. When the concentration detected by a certain detector exceeds the upper limit or is lower than the lower limit, the GDS control unit will output the alarm signal via the DO module to activate the audible & visible alarm and switch on or off the related equipment.
The operators can monitor all detection points in the plant in real time through the touch screen of the industrial computer, operator station and engineer station or any other human-machine interaction interface, mainly including the gas concentration value, upper alarm limit, real-time curve and historical data. When any alarm is given, it can also be silenced and responded through the industrial computer.
System and its composition
System functions:
Through the GDS system (gas detection and alarm system), the system can achieve the real-time monitoring, early warning processing, remote control as well as equipment management and integration, and can also realize the real-time monitoring of dangerous gas leakage in the plant and intelligent judgment of alarms; it supports audible & visible alarms, video linkage alarm and many other kinds of alarm effects. It can effectively prevent the occurrence of safety accidents in the enterprises, realize the control and management of gas leakage in the production process, and ensure the work safety of the enterprise.
System features:
In order to make the GDS system achieve a high reliability and reach the leading technical level in China, the overall design and implementation of the system shall be based on the principles of advanced technology, reliable operation, abundant functions, convenient operation, easy maintenance and reasonable investment.
Advancement: Adopt the advanced design ideas and equipment, and make full use of the existing high and new technologies to make the system reach the domestic advanced level.
Maturity: Adopt mature technologies, brands and models, and construct the system in a standard manner to ensure the proper operation of the system.
Openness: Comply with relevant standards, be able to support a variety of networks and terminal devices, and support a variety of system structures and open communication protocols.
Extensibility: The system structure shall be advanced and reasonable, and the software and hardware shall allow for convenient expansion.
Reliability: Provide a fail-safe design. Support fault detection and recovery, with high manageability.
Practicality: Be fully combined with the reality of the site and user-selected communication modes, so as to meet the system application requirements.
Maintainability: Choose the easy-to-support, standardized product model protocols, open and easy to maintain.
Economy: In the design, give full consideration to the reality of the Owner, so as to achieve a higher performance-price ratio.