Two-wire system intelligent pressure transmitter using APL technology

Abstract

The invention discloses a two-wire system intelligent pressure transmitter applying an APL technology. The two-wire system intelligent pressure transmitter comprises an embedded microprocessor, an analog-to-digital conversion circuit, an Ethernet interface, a power supply and reference circuit, a display module, a two-wire system Ethernet communication module, an intrinsic safety energy limiting module, a pressure sensor, a memory and a temperature sensor. The pressure sensor and the analog-to-digital conversion circuit are in data communication with the embedded microprocessor through a UART serial interface and are used for receiving and processing signals. The temperature sensor is connected with the embedded microprocessor and used for measuring the environment temperature to correct the pressure value. By adopting the technical scheme, the intelligent pressure transmitter provided by the invention has the following advantages that the structure is simple, the cost is saved, the installation is simple and convenient, the parallel transmission of data and power of an instrument is realized on a pair of twisted pairs, and the intelligent pressure transmitter has important significance and an acceleration effect on promoting the interconnection and intercommunication application of instruments and meters in China in the industrial Internet of Things.

Description

technical field [0001] The invention relates to a pressure transmitter in the field of instrumentation and industrial Ethernet communication, in particular to a two-wire intelligent pressure transmitter using APL technology. Background technique [0002] The pressure transmitter is an important component used to monitor the process and pressure changes in the industry. It is a commonly used primary instrument in the industrial field and the basic unit in the industrial control system. Pressure transmitters are used to measure the level, density and pressure of liquids, gases or vapors, and then convert the pressure signal into a standardized output signal that can be transmitted. With the continuous development of electronic science and technology, the process industry has special requirements for the Ethernet transmission of pressure transmitters. The transmission distance of the backbone network is required to be as long as 1000 meters, and the transmission distance of the...

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Problems solved by technology

Traditional 4-20mA current loop technology and digital current loop technology such as PA / FF have the advantages of strong anti-interference ability, long transmission distance, and support for two-wire power supply, etc., but they belong to dedicated communication technology and need to be connected to Ethernet through a gateway; ordinary 10M / 100M Ethernet technology can realize one network from the top layer to the bottom layer and interconnection, but it can only realize data transmission within a range of 100 meters. If you want to supply power to the device through Active Ethernet (PoE) technology, at least 4 cables are required. line, which does not conform to the two-wire power supply habit commonly used in industrial sites

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