The plant toxic and harmful gas monitoring system is mainly divided into 3 parts:
The first part: front-end field instruments. The second part: the signal transmission process. Part III: Centralized management and control of the terminal. Now we will briefly introduce the main part.
Front-end field instrument: It is mainly installed at the test site. The function of the instrument is to display the concentration in situ. The audible and visual alarm can also be selected locally. The output signal of the instrument includes the standard Modbus protocol of current signal and communication digital RS485. As well as the digital relay signal, this output signal can be transmitted remotely and can be linked to the nearest device.
Signal transmission part: It is divided into wired signal connection and wireless signal. Advantages of wired signal connection: simple, stable and mature technology. Disadvantages: heavy workload of construction wiring, troublesome maintenance fault finding in later period, not suitable for remote monitoring system Advantages of wireless signal connection: simple wiring, mature technology, convenient expansion, and transmission distance is no longer an issue. Disadvantages: large initial investment.
Centralized terminal monitoring: There are two main ways to choose: 1) Computer intelligent management system, the main function can realize multi-point centralized control, the system scalability does not increase the cost, and it can store data, historical reports, alarm records, graphs, etc. The orientation shows the change in concentration. 2) Gas control host, multi-purpose for fixed channel inspection, providing centralized alarm, centralized monitoring of concentration data of each channel.
For the above control system components, not every control site needs to be configured and selected according to the actual situation. In addition, some gas detection environments may involve pretreatment before they can be introduced into the testing instrument for testing.
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