HJ 212-2025Technical requirements for data transmission of pollutant automatic monitoring and surveillance systems (English PDF)

1 Scope

This standard specifies the system architecture of the pollutant automatic monitoring and control system, the protocol hierarchy between field computers and the host computer, the communication protocol between field computers and the host computer, the communication method between automatic monitoring field instruments and data loggers, the technical requirements for data acquisition, processing, uploading.

This standard applies to data transmission between automatic monitoring equipment and monitoring equipment, as well as data acquisition and processing by automatic monitoring equipment.

2 Normative references

This standard references the following documents or clauses therein. For dated references, only the dated version applies to this standard. For undated references, the latest version (including all amendments) applies to this standard. If other documents are abolished, modified, or revised by new documents, the new documents apply to this standard.

GB 3096 Environmental quality standard for noise

GB/T 19582 (all parts) Modbus industrial automation network specification

GB/T 28181 Technical requirements for information transmission, switch and control in video surveillance networking system for public security

HJ 75 Specifications for continuous emissions monitoring of SO2, NOX, and particulate matter in the flue gas emitted from stationary sources

HJ 76 Specifications and test procedures for continuous emission monitoring system for SO2, NOX and particulate matter in flue gas emitted from stationary sources

HJ 353 Technical specification for installation of wastewater on-line monitoring system (CODCr, NH3-N et al.)

HJ 356 Technical specification for data validity of wastewater on-line monitoring system (CODCr, NH3-N et al.)

HJ 524 Codes for air pollutants

HJ 525 Codes for water pollutants

HJ 1402 Technical specification for automatic monitoring of construction noise

3 Terms and definitions

The following terms and definitions apply to this standard.

3.1

Automatic monitoring equipment

Instruments and equipment installed at the monitoring site for direct or indirect environmental monitoring or pollution source monitoring, referred to as field equipment, which include various types of instrumentation and equipment, such as data acquisition and transmission equipment, electricity surveillance equipment, pollutant emission process (operating condition) monitoring equipment, video capture equipment.

3.2

Electricity surveillance

The monitoring of the operating technical parameters (current, voltage, power, electricity consumption) of electrical equipment that reflect the operating status of production facilities and pollution control facilities, using electricity surveillance equipment and power data.

3.3

Emission process (operating status) surveillance of pollutants

The monitoring of the operating parameters (including process parameters such as flow rate, temperature, oxygen content, pressure) and other parameters such as current and voltage of production facilities and pollution control facilities, that affect pollutant emissions, using pollutant emission process (operating status) monitoring equipment and pollutant emission process (operating status) data.

3.4

Video surveillance

The monitoring of pollution sources during their production, treatment, discharge, monitoring phases is carried out using video acquisition equipment or computer systems built with audio and video, communications, computer network

Data mark

The operation of automatically marking the operating conditions of production facilities, pollution control facilities, field equipment using character classification.

4 System structure

The pollutant automatic monitoring and control system can be divided into three layers, from the bottom layer upwards. field equipment, transmission network, host computer.

The host computer communicates with the field equipment via the transmission network (including initiation, data exchange, response).

There are two configuration options for the pollutant automatic monitoring and control system.

a) System configuration 1.One set of field equipment integrates automatic monitoring instruments, storage, communication functions. It can directly receive and issue commands to and from the host computer via the transmission network.

A schematic diagram of this system configuration is shown in Figure 1.

b) System configuration 2.One or more sets of automatic monitoring instruments are located on-site. These instruments have digital (analog) output interfaces connected to independent data acquisition devices. The host computer communicates with the data acquisition devices via a transmission network (including initiation, data exchange, response). A schematic diagram of this system configuration is shown in Figure 2.

5 Protocol layers between field and host computers

The communication interface between the field and host computers must meet the requirements of the selected transmission network.

The data transmission protocol specified in this standard corresponds to the application layer of the protocol model defined by the International Standards Organization/Open

System Interconnection (ISO/OSI) reference model. It provides interactive communication between field and host computers based on different transmission networks.

A schematic diagram of the data transmission protocol structure is shown in Figure 3.

The basic transport layer in this standard is built on the Transmission Control

Protocol/Internet Protocol (TCP/IP) and is applicable to the following communication media.

a) General Packet Radio Service (GPRS);

b) Asymmetrical Digital Subscriber Loop (ADSL);

c) Code Division Multiple Access (CDMA);

d) Wideband Code Division Multiple Access (WCDMA);

e) Time Division - Synchronous CDMA (TD-SCDMA);

f) Wideband CDMA Technology (CDMA2000);

g) Power Line Communication (PLC);

h) Time Division Long Term Evolution (TD-LTE);

i) Frequency Division Duplex Long Term Evolution (FDD-LTE);

j) Worldwide Interoperability for Microwave Access (WiMAX);

k) Narrow Band Internet of Things (NB-IoT);

l) Satellite Communication Technology (including FDMA, TDMA, CDMA, SDMA, etc.).

The transmission network referred to in this standard is composed of one or more of the above communication media.

The application layer of this standard relies on the underlying transport layer, which uses the TCP/IP protocol (the TCP/IP protocol has four layers. network interface layer, network layer, transport layer, application layer). The TCP/IP protocol is built on the selected transmission network; the network interface layer of the TCP/IP protocol implements the interface with the transmission network. The application layer of this standard replaces the application layer of the TCP/IP protocol.

6 Communication protocol between field computer and host

computer

7 Communication methods between automatic monitoring

field instruments and data loggers