CN206095511U - Pressure transmitter with HART communication function - Google Patents

Abstract

The utility model belongs to the field of pressure transmitters, in particular to a pressure transmitter with a HART communication function. The pressure transmitter with a HART communication function includes: an electric bridge composed of sensor resistance, a temperature sensor, A 16-bit single-chip microcomputer connected with the electric bridge and the temperature sensor, the single-chip microcomputer is equipped with an A/D conversion module, the single-chip microcomputer is connected with the EEPROM memory, the zero adjustment button, the button and the display module, and the output terminal of the single-chip microcomputer is connected to the current The control circuit is connected to the communication interface, one branch of the output end of the current control circuit outputs a 4-20mA analog current, the other branch is connected to the HART communication module, and the input end of the current control circuit is connected to the HART communication module to form a loop. The HART communication module is connected with the single chip microcomputer. The utility model can provide a pressure transmitter with HART communication function.

Description

A pressure transmitter with HART communication function

technical field

The utility model belongs to the field of pressure transmitters, in particular to a pressure transmitter with HART communication function.

Background technique

In recent years, pressure transmitters have been widely used in large-scale industrial fields such as chemical industry, metallurgy, and power generation. However, in order to meet the needs of industrial fields, existing pressure transmitters generally have complex structures, high costs, and do not have industry versatility. And then it is not easy to popularize and apply in civilian field. To solve this problem, Chinese patent CN204758198U discloses an intelligent micro-differential pressure transmitter, including a microprocessor, an A/D converter, a D/A converter, a liquid crystal display, a modem, a keyboard, a memory, a voltage regulator, V/I conversion circuit and power supply, wherein, A/D converter, D/A converter, liquid crystal display, modem, keyboard, memory, and voltage regulator are all connected to the microprocessor, and the input terminal of the V/I conversion circuit is connected to the D The output of the /A converter is connected, and the power supply is connected to the voltage regulator and supplies power to the microprocessor. Yet this utility model can't complete communication with upper computer.

Therefore, based on these problems, it has important practical significance to provide a pressure transmitter with HART communication function.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a pressure transmitter with HART communication function.

The utility model solves its technical problem and realizes by taking the following technical solutions:

A pressure transmitter with HART communication function, the pressure transmitter with HART communication function includes: a bridge formed by sensor resistance, a temperature sensor, and a 16-bit sensor connected to the bridge and the temperature sensor A single-chip microcomputer, the A/D conversion module is arranged in the single-chip microcomputer, the single-chip microcomputer is connected with the EEPROM memory, the zero adjustment button, the button and the display module, the output end of the single-chip microcomputer is connected with the current control circuit and the communication interface, and the current control circuit One branch of the output terminal outputs 4-20mA analog current, the other branch is connected with the HART communication module, the input terminal of the current control circuit is connected with the HART communication module to form a loop, and the HART communication module is connected with the single chip microcomputer.

Advantage and positive effect of the present utility model are:

1. The utility model is equipped with a HART communication module, furthermore, through the HART protocol, the frequency signal does not produce any interference to the 4-20mA process during communication.

2. The utility model is equipped with a memory, even if the power is cut off, the stored data can still be kept intact, so as to realize intelligent communication at any time.

Description of drawings

The technical scheme of the utility model will be further described in detail below in conjunction with the drawings and embodiments, but it should be known that these drawings are only designed for the purpose of explanation, and therefore are not intended to limit the scope of the utility model. Furthermore, unless otherwise indicated, the drawings are only intended to conceptually illustrate the architectural configurations described herein and are not necessarily drawn to scale.

Figure 1 is a structural schematic diagram of a pressure transmitter with HART communication function.

detailed description

First of all, it should be noted that the specific structure, characteristics and advantages of the pressure transmitter with HART communication function of the present invention will be described in detail below by way of example, but all descriptions are only for illustration. Rather, it should not be construed as forming any limitation on the present utility model. In addition, any single technical feature described or implied in each embodiment mentioned herein, or any single technical feature shown or implied in each drawing, can still be described in these technical features (or their equivalents) ) to continue any combination or deletion, so as to obtain more other embodiments of the present utility model that may not be directly mentioned herein. In addition, for the sake of simplifying the drawings, the same or similar technical features may only be marked in one place in the same drawing.

It will be understood that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may be present. Conversely, when a part is said to be "directly connected" to another part, it means that there are no intermediate parts present.

Fig. 1 shows a schematic structural diagram of a pressure transmitter with HART communication function, and the utility model will be described in detail with reference to Fig. 1 below.

As shown in Figure 1, a pressure transmitter with HART communication function, the pressure transmitter with HART communication function includes: a bridge composed of sensor resistance, a temperature sensor, and the bridge and A 16-bit single-chip microcomputer connected to the temperature sensor, the single-chip microcomputer is equipped with an A/D conversion module, the single-chip microcomputer is connected with the EEPROM memory, the zero adjustment button, the button and the display module, and the output terminal of the single-chip microcomputer is connected with the current control circuit and the communication interface , one branch of the output end of the current control circuit outputs a 4-20mA analog current, the other branch is connected to the HART communication module, the input end of the current control circuit is connected to the HART communication module to form a loop, and the HART communication module is connected to the HART communication module connected to the microcontroller.

During the working process, the pressure introduced from the outside will change the resistance value of the sensor, causing the voltage output of the bridge to change, which will be converted into a digital signal by A/D conversion, and the microprocessor will output a current control signal to the circuit after operation. Control circuit, converted to 4-20mA analog current output. It is used for digital communication through the communication interface, realizes HART communication of the transmitter through the HART module, and performs operations such as zeroing and active calibration of the transmitter through the zero adjustment button.

EEPROM memory stores all configuration, characterization and digital fine-tuning parameters. This memory is non-volatile, so even if the power is cut off, the stored data can still be preserved intact to realize intelligent communication at any time. The transmitter with HART module can test and configure the transmitter through a communicator, or complete the communication through any host system that supports the HART communication protocol.

The utility model is equipped with a HART communication module, and further, through the HART protocol, the frequency signal does not produce any interference to the 4-20mA process during communication. The utility model is equipped with a memory so that even if the power is cut off, the stored data can still be kept intact so as to realize intelligent communication at any time.

To sum up, the utility model can provide a pressure transmitter with HART communication function.

The above embodiments have described the utility model in detail, but the content described is only a preferred embodiment of the utility model, and cannot be considered as limiting the implementation scope of the utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (1)

1. a kind of pressure transmitter with HART communication function, it is characterised in that：The pressure with HART communication function Transmitter includes：The electric bridge being made up of sensor resistance, temperature sensor, 16 be connected with the electric bridge and temperature sensor Single-chip microcomputer, sets A/D modular converters, the single-chip microcomputer and eeprom memory, zeroing button, button and display in the single-chip microcomputer Module is connected, and the outfan of the single-chip microcomputer is connected with current control circuit and communication interface, the current control circuit output One branch road output 4-20mA analog current at end, another branch road are connected with HART communication module, the current control circuit Input is connected to form loop with HART communication module, and the HART communication module is connected with the single-chip microcomputer.