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Is the sensor the same as the transmitter? What are the differences and connections between them?

by:Rika Sensors     2021-10-17
Is the sensor the same as the transmitter? What are the differences and connections between them?
Sensors and transmitters play an important role in the field of automatic control. Transmitters are developed on the basis of sensors. They are closely related and have differences.

Different from the definition of sensor and transmitter:

The sensor, judging from its name, has two characters: transmission and sense. Transmission refers to transmission, and sense refers to perception. In fact, there is 'perception' first, then conversion, and finally transmission. Therefore, transmission is the goal, conversion is the means, and perception is the foundation. The components that can sense the measured variables (temperature, pressure, liquid level, flow) are called sensitive components, and the components that can convert the sensed variables into non-standard electrical signals or other forms of output signals are called conversion components. Therefore, the composition of the sensor is composed of sensitive components and conversion components.

Transmitter, judging from the name of the transmitter, there are two characters: change and send. Changing is transforming, sending is conveying. In fact, there is transformation before delivery, so delivery is the purpose and transformation is the foundation. The transformation part is to transform the non-standard electric signal or other forms of signal transmitted by the sensor into a standard electric signal, such as 4-20mA, 1-5v, and then send the standard signal to the secondary instrument.

From the role of sensors and transmitters:

Sensors are the main way and means to obtain information in the field of nature and production; sensor technology plays an important role in developing economy and promoting social progress; In industrial production, especially in the automated production process, various sensors must be used to monitor and control various parameters in the production process to make the equipment work in a normal or optimal state, and to achieve the best quality of the product.

The function of the transmitter is to detect the process parameters and transmit the measured value in a specific signal form for display and adjustment. The role in the automatic detection and adjustment system is to transform various process parameters such as temperature, pressure, flow, liquid level, composition and other physical quantities into unified standard signals, and then transmit them to the regulator and indicating recorder for adjustment, indication and record.

Different from the composition of sensors and transmitters:

Sensors are generally composed of four parts: sensitive components, conversion components, conversion circuits and auxiliary power supplies. The sensitive element directly senses the measured and outputs a physical quantity signal that has a definite relationship with the measured; the conversion element converts the physical quantity signal output by the sensitive element into an electrical signal; the conversion circuit is responsible for amplifying and modulating the electrical signal output by the conversion element; the conversion element and The conversion circuit requires auxiliary power supply.

The transmitter is mainly composed of a measuring part, an amplifier and a feedback part. The measurement part is used to detect the measured variable x and convert it into an input signal Zi that can be accepted by the amplifier. The feedback part converts the output signal y of the transmitter into a feedback signal Zf, and then sends it back to the input terminal. Zi is compared with the zero algebraic signal Zo and the feedback signal Zf, and the difference ε is sent to the amplifier to be amplified and converted into a standard output signal y.

Distinguish from the acquisition signal of the sensor and the transmitter:

The signal output by the sensor has non-standard electrical signals or other forms of signals, which are weak non-standard signals.

It is a standard electrical signal, and the output signal is strong. For long distances, standard current signals can be used for transmission, and for short distances, standard voltage signals can be used for transmission.

Different from the output of the sensor and transmitter:

The output of the transmitter is a standard power signal, such as 0-5V voltage, 4-20mA current, etc.

The output of the sensor is not so standard, such as a very weak electrical signal. The transmitter must contain a sensor, which is equivalent to a sensor + power conversion device.

Different from the wiring system and power supply of sensors and transmitters:

Sensors have two-wire, three-wire, and four-wire systems. Some require additional power supply, and some do not require power supply.

The transmitter is basically a two-wire system and the power supply and signal are the same group of wires.



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