Function and principle of signal transmitter

This article is edited by Shenzhen Huanan Hengtai Industrial Co., LTD., if reproduced, please indicate the source

The function and principle of the signal transmitter can be summarized as follows:

一. Function:

1. Signal conversion: The signal transmitter can convert various physical quantities (such as temperature, pressure, liquid level, flow, etc.) into standard electrical signals, such as 4-20mA, 0-10V, etc., which is convenient for subsequent equipment to measure and process.
2. Signal transmission: The converted electrical signal can be transmitted to a remote monitoring system, recorder, PLC and other equipment to achieve remote monitoring and control.
3. Signal processing: there are usually some signal conditioning and processing circuits inside, which can amplify, filter, and linearize the input signal to improve the accuracy and stability of the measurement.
4. Protection and isolation: Some signal transmitters have protective functions that can resist harsh environmental conditions, such as high temperature, high pressure, corrosion, etc. At the same time, it can also achieve electrical isolation to protect the safety of the measurement system and the measured object.

二, principle:

The working principle of the signal transmitter mainly involves the modulation transformation, isolation conversion and demodulation transformation of the signal.

1. Modulation transformation: First, the signal of the transmitter or instrument is modulated through the semiconductor device.
2. Isolation conversion: isolation conversion is then carried out through light or magnetic sensing devices to ensure that the transformed signal, power supply and ground are absolutely independent.
3. Demodulation transformation: demodulation transformation is performed back to the original signal before isolation, and the power supply of the isolated signal is isolated.

In addition, the main types of signal transmitters include isolators, distributors and safety grids, each of which plays a different role in industrial production. For example, the isolator is mainly used to increase the load capacity of the instrument and ensure that the instrument connected to the same signal does not interfere with each other; The distributor not only provides distribution power for the transmitter and other primary instruments, but also processes the input current signal. The safety grid in some special industrial sites (such as gas companies and chemical plants), in addition to providing power distribution and signal isolation functions, but also has the performance of safety spark explosion-proof.

Please note that due to different manufacturers, the production process and wiring definition of the signal transmitter may also be different, but the use of the situation is basically the same, so the protection requirements and maintenance of the product are basically the same. Read the instructions carefully before use to ensure correct installation and use.



The above information is for reference only, not for professional literature