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This overview covers the Milog4 pressure recorder manufactured by Hengtaishi Instruments. It incorporates two internal pressure sensors, one PT100 temperature sensor, 4 digital input channels, and 2 digital output channels. The built-in pressure sensors can be replaced with two 4–20mA transmitter signals. Milog4 supports the RS485 interface of a single Modbus master, allowing it to connect with most flow meter devices, such as those manufactured by brands like Tianxin, Cangnan, Aichuang, Elster, and Xinke. Milog4 is equipped with a GPRS module; based on the set parameters, it connects to a server that has communication drivers and an MS SQL2008 database installed. The data sent by Milog4 is stored in this historical database. The communication drivers support the Modbus-RTU protocol for communication from Milog4 to the server, while they support the Modbus-TCP protocol for communication from the PC client to Milog4. The SCADA scheduling platform management software, installed at the control center, collects real-time data on the operating parameters of monitoring stations. It enables automatic and continuous monitoring and management of the operation of pipeline networks and process equipment, as well as data analysis, providing essential decision-support information for the balanced and safe operation of these systems. Remote transmission of flow meter data at the gate station and SCADA monitoring functions; MiLog4 terminal features: The MiLog4 pressure recorder operates on an external power supply, with the operating voltage ranging from 8 to 36 V. When it detects an external power source, the MiLog4 automatically enters real-time communication mode, connecting to the server to receive Modbus-RTU commands sent by the server. It mainly includes current data acquisition commands and instrument parameter setting commands. Milog4 can report the pressure values collected by its two built-in pressure sensors, and it can also receive signals from 4–20mA transmitters. It enables the acquisition of various signals that are important for users in the pressure regulation station, such as the pressure before and after the regulator, the temperature of the gas medium, access control status, gas concentration, water level, and valve status. Gas pressure regulation stations and industrial users are equipped with gas flow meters. By transmitting the data from these flow meters, it is possible to monitor the flow rate at the stations in real time, as well as any sudden changes or abnormally high flow rates. Such conditions may be caused by gas leaks, allowing for timely detection of problems and effective troubleshooting, as well as rational management of gas usage. Monitoring the gas consumption of industrial users facilitates the estimation of their gas needs, enables rational planning and allocation of gas supplies. When there is a shortage of gas, it is possible to make appropriate adjustments based on each user’s consumption patterns, so that they can use gas at different times and make more efficient use of it. Functions of the communication front-end unit: This server communication front-end unit is responsible for the registration and management of Milog4 series devices, as well as data communication tasks. It is compatible with Shenzhen Hongdian DTU modules, and can be connected to data acquisition terminals from other manufacturers that support the Modus-rtu protocol. The server communication front-end is responsible for parsing the communication data from the site and storing it in the relational database MS SQL; it can also forward the data to other interfaces to enable cross-use of the data. The data from our pressure recorders has been integrated into SNOW’s management platform via the data interface of SNOW’s visualization system platform. The server communication front-end unit provides an uplink communication interface, which can be connected to configuration software as well as to the SCADA monitoring system of the company’s pressure regulation stations (system structure and functional block diagram). The functions of the PRGAS pressure regulation station SCADA monitoring platform include: its main function is the real-time collection, processing, and storage of data from various stations ； —Real-time and historical data trend charts, bar charts, and other visual displays ； —Monitor the on-site process variables and the operating status of all process equipment along the line ； —Issue scheduling and operation commands ； —Alarm and event management ； —Generation and printing of various reports ； —Network monitoring and network device management ； —SQL/ODBC relational database connection ； —Parameter setting screen ； —System self-diagnosis ； —Support for distribution scheduling management system (DMS system) ； —Synchronization and failover between the main dispatch center and the disaster recovery backup dispatch center ； l Product parameters: 1. Analog signals: It incorporates one pressure sensor (or two pressure sensors, along with one PT100 temperature sensor). The measurement range covers high pressure, medium-high pressure, medium pressure, and low pressure levels, with an accuracy of grade 0.4. 2. Communication module: Local serial communication; for remote use, an NBIOT IoT communication module is employed. It also supports downloading historical data via USB drive. 3. Data storage: Each monitoring point can record up to 500,000 data points, with continuous storage possible for 5 years. Data can be stored in a cyclic manner or until the storage capacity is full. 4. Operating environment: Operating temperature range of -40 to 70°C; humidity level below 90% RH. 5. Power supply: Powered by an internal battery, enabling uninterrupted operation throughout the year. The battery’s lifespan is at least 5 years, and no maintenance is required. 6. Communication protocol: This system uses the standard MODBUS communication protocol, and it also supports remote parameter setting via NBIOT. 7. Alarm functions: Real-time alarms are triggered when pressure levels exceed limits, battery power is low, or there are changes in digital input signals (such as door access status or valve positions). Alarms can also be sent via the 106 SMS platform. Under normal operating conditions, the system periodically reports historical data to ensure data integrity. Pressure interface: ZG1/2 inch external thread. 8. Display screen: Ultra-low temperature display with comprehensive data presentation; temperature range: -45 to 859. Supporting software: Single-terminal historical data analysis software and voltage regulator fault analysis software; custom data forwarding interface available. 10. Explosion-proof certificate: E*IB CT4 CnEx: 18.3739X. 11. Power supply: 8~24V, with a power output of ≥8W.