Digital pressure transmitter based on SDI communication

Abstract

The utility model provides a digital pressure transmitter based on SDI communication, and relates to the field of transmitters, and the digital pressure transmitter based on SDI communication comprises a power line, a grounding line, an SDI communication connecting line, and a plurality of digital pressure transmitters. According to the digital pressure transmitter provided by the utility model, a user can read a pressure value or perform other settings through a corresponding instruction; under the condition that the pressure value does not need to be read, the pressure transmitter can enter a sleep mode, so that the power consumption can be reduced, and a customer can conveniently use the pressure transmitter in a battery power supply system; in addition, no transmitter needs an independent address, so that when a plurality of transmitters exist in one pressure system, the plurality of pressure transmitters can be connected in parallel, and user wiring can be simplified.

Description

Technical Field

[0001] This application relates to the field of transmitters, and more specifically, to a digital pressure transmitter based on SDI communication. Background Technology

[0002] A pressure transmitter is a device that converts the pressure of fluids such as liquids and gases into an electrical signal that can be recognized by an instrument. The typical output is an analog signal, such as 4-20mA, 0-5V, or 0-10V.

[0003] The limitations of this output are as follows: If the output is in the form of 0-5V or 0-10V voltage, the transmission distance of this signal cannot be too long, otherwise the signal will be attenuated and it will be susceptible to electromagnetic interference; conventional analog output transmitters have relatively high power consumption, which cannot meet the increasing demand for low power consumption from users; users must have an output converter when using conventional analog output transmitters, which increases the user's operating costs; generally, after long-term use, the transmitter will develop a zero-point deviation, which can be eliminated by zeroing. However, to eliminate the zero-point deviation of conventional analog output transmitters, it is necessary to go to the transmitter's field of use; conventional pressure transmitters are difficult to perform range shifting. Summary of the Invention

[0004] The purpose of this application is to provide a digital pressure transmitter based on SDI communication, which can solve the above-mentioned technical problems.

[0005] This application provides a digital pressure transmitter based on SDI communication, including a power line, a ground line, an SDI communication connection line, and multiple digital pressure transmitters. Each digital pressure transmitter includes a pressure sensor, a power management module, an MCU, and a level conversion module. The digital pressure transmitters are connected to the power line, the ground line, and the SDI communication connection line, respectively. The multiple digital pressure transmitters are connected in parallel. The pressure sensor and the power management module are both connected to the input terminal of the MCU, and the output terminal of the MCU is electrically connected to the level conversion module.

[0006] Preferably, the pressure sensor includes a Wheatstone bridge.

[0007] Preferably, the digital pressure transmitter is provided with three.

[0008] The beneficial effects of this utility model are:

[0009] This invention provides a digital pressure transmitter based on SDI communication, comprising a power line, a grounding wire, an SDI communication connection line, and multiple digital pressure transmitters. Each digital pressure transmitter includes a pressure sensor, a power management module, an MCU, and a level conversion module. The digital pressure transmitters are connected to the power line, the grounding wire, and the SDI communication connection line, respectively. Multiple digital pressure transmitters are connected in parallel. The pressure sensor and the power management module are both connected to the input terminal of the MCU, and the output terminal of the MCU is electrically connected to the level conversion module. This digital pressure transmitter allows users to read pressure values ​​or perform other settings via corresponding commands. When pressure value reading is not required, the pressure transmitter can enter a sleep mode, which reduces power consumption and facilitates use in battery-powered systems. No transmitter requires a separate address; therefore, when multiple transmitters exist in a pressure system, they can be connected in parallel, simplifying wiring for the user. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a connection diagram of the present utility model;

[0012] Figure 2 This is the circuit diagram of the pressure sensor of this utility model. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0015] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0016] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0017] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0018] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0019] like Figure 1As shown, a digital pressure transmitter based on SDI communication includes a power line, a grounding wire, an SDI communication connection line, and multiple digital pressure transmitters. Each digital pressure transmitter includes a pressure sensor, a power management module, an MCU, and a level conversion module. The digital pressure transmitters are connected to the power line, the grounding wire, and the SDI communication connection line, respectively. Multiple digital pressure transmitters are connected in parallel. The pressure sensor and the power management module are both connected to the input terminal of the MCU, and the output terminal of the MCU is electrically connected to the level conversion module. This digital pressure transmitter allows users to read pressure values ​​or perform other settings via corresponding commands. When pressure value reading is not required, the pressure transmitter can enter a sleep mode, which reduces power consumption and facilitates use in battery-powered systems. No transmitter requires a separate address; therefore, when multiple transmitters exist in a pressure system, they can be connected in parallel, simplifying wiring for the user.

[0020] like Figure 2 As shown, in this embodiment, the pressure sensor includes a Wheatstone bridge. The pressure sensor consists of a Wheatstone bridge, which generates a pressure-proportional millivolt signal between S+ and S- when pressure is applied. This millivolt signal is then filtered and pre-amplified before being input to the MCU. Within the MCU, a filtering algorithm is used to specifically filter the sampled values. After acquiring the pressure and temperature signals, the MCU uses a fitting algorithm to compensate for the temperature drift and nonlinearity of the pressure sensor, resulting in higher accuracy and lower temperature drift of the pressure transmitter. The system uses the SDI-12 standard protocol for communication, and can recognize some standard communication commands of the SDI-12 standard protocol.

[0021] In this embodiment, three digital pressure transmitters are provided; specifically, the appropriate number can be selected according to requirements.

[0022] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A digital pressure transmitter based on SDI communication, characterized in that: It includes power line, ground line, SDI communication connection line and multiple digital pressure transmitters, the digital pressure transmitter includes pressure sensor, power management module, MCU, level conversion module, the digital pressure transmitter is connected with the power line, the ground line, the SDI communication connection line respectively, multiple digital pressure transmitters are connected in parallel, the pressure sensor, the power management module are connected with the input end of the MCU, and the output end of the MCU is electrically connected with the level conversion module.

2. The digital pressure transmitter based on SDI communication according to claim 1, characterized in that: The pressure sensor includes a Wheatstone bridge.

3. The digital pressure transmitter based on SDI communication according to claim 1, characterized in that: The digital pressure transmitter is provided with three.

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