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Pressure Transmitter Vs. transducer
Dec 18, 2018


Pressure Transmitter vs. Transducer


Many people don't understand the difference between a pressure transmitter and a pressure transducer.Today we will focus on the comparison of pressure transmitter and pressure transducer.

The pressure transducer converts non-electrical physical quantities such as gravity, pressure, liquid level, material characteristics, etc. into electrical signals or sends physical quantities such as pressure, liquid level, etc. directly to the pressure transmitter. The pressure transmitter amplifies the weak electrical signal collected by the pressure transducer to transfer or activate the control element. Or a signal source that converts the non-electricity of the transducer input into an electrical signal while amplifying it for remote measurement and control. The analog quantity can also be converted to a digital quantity as needed.

pressure transmitter vs. sensor


What is a pressure transmitter?


A pressure transmitter is a device that converts pressure into a pneumatic or electric signal for control and remote transmission. It can convert the physical pressure parameters such as gas and liquid felt by the load cell transducer into standard electrical signals (such as 4~20mADC, etc.) to supply the secondary instrument such as indicating alarm device, recorder, regulator, etc. for measurement and indication. And process adjustment.


Pressure transmitter working principle


When the pressure acts directly on the surface of the measuring diaphragm to cause a slight deformation of the diaphragm, the high-precision circuit on the measuring diaphragm transforms this tiny deformation into a highly linear voltage proportional to the pressure and proportional to the excitation voltage. Signal, then use a dedicated chip to convert this voltage signal into an industry standard 4-20mA current signal or 1-5V voltage signal


What is a pressure transducer?


Pressure transducers are the most widely used type of transducer. The conventional pressure transducer is mainly a mechanical structure type device, and the pressure is indicated by the deformation of the elastic element, but the structure is large in size and heavy in weight, and cannot provide an electrical output. With the development of semiconductor technology, semiconductor pressure transducers have emerged. It is characterized by small size, light weight, high accuracy and good temperature characteristics. In particular, with the development of MEMS technology, semiconductor transducers are moving toward miniaturization, and their power consumption is small and reliability is high.


Pressure transducerr working principle


The working principle of the pressure transducer is that it has a sliding resistor inside, which uses the oil pressure to push the potentiometer of the sliding resistor to move, change the current of the oil pressure gauge, and change the position of the pointer. If the engine temperature is high, it is easy to produce sludge, so it is necessary to pay attention to the engine. Maintenance and oil selection. It makes sense to choose high quality motor oil. Why high-quality motor oil, such as Shell, pays great attention to the cleaning ability of the product. Because the engine oil is related to the lubrication of the engine, reducing wear, cooling and sealing, the poorly cleaned oil often cannot prevent the accumulation of carbon deposits. The accumulation of carbon deposits inside the engine will accelerate the wear of the cylinder liner, piston and piston ring. More serious damage to the engine.

 

pressure transmitter vs. sensor

The pressure transducer and pressure transmitter together form an automatically controlled monitoring signal source. Different physical quantities require different pressure transducers and corresponding pressure transmitters.


1, First,we look at the origin of the transducer.


In order to obtain information from the outside world, people must resort to the transducery organs. And by relying on people's own transducery organs, their functions in researching natural phenomena and laws and production activities are far from enough. To accommodate this situation, transducers are needed. Therefore, it can be said that the transducer is an extension of the human five senses, also known as electric five senses.

With the innovation of technology, transducers have become more widely used, and the principles and structures range from simple to simple and intelligent. transducers have long penetrated into extremely ubiquitous fields such as industrial production, space development, ocean exploration, environmental protection, resource surveys, medical diagnostics, bioengineering, and even cultural relics protection.


2. When did the transmitter appear? What is the connection with the transducer? How to see the difference between transducer and transmitter


(1) We know that a transducer is a general term for a device or device that can be measured and converted into a usable output signal according to a certain rule, and is usually composed of a sensitive component and a conversion component. When the output of the transducer is a specified standard signal, it is called a transmitter.

(2) The concept of the transmitter is to convert the non-standard electrical signal into a standard electrical signal. The transducer is a device that converts the physical signal into an electrical signal. In the past, the physical signal was often used, and now other signals are also available. Two types of physical transducers and chemical transducers). The primary instrument refers to the on-site measuring instrument or the base control table. The secondary instrument refers to the instrument that uses the primary signal to complete other functions: functions such as control and display.

(3) The transducer converts non-electrical physical quantities such as temperature, pressure, liquid level, material, gas characteristics, etc. into electrical signals or directly transmits physical quantities such as pressure and liquid level to the transmitter. The transmitter amplifies the weak electrical signal collected by the transducer to transfer or activate the control element. Or a signal source that converts the non-electricity of the transducer input into an electrical signal while amplifying it for remote measurement and control. The analog quantity can also be converted to a digital quantity as needed. The transducer and transmitter together form an automatically controlled monitoring signal source. Different physical quantities require different transducers and corresponding transmitters.

There is also a transmitter that does not convert physical quantities into electrical signals, such as a "differential pressure transmitter" for a boiler water level gauge. It sends the lower water in the level transducer and the condensate from the upper steam through the meter tube. On both sides of the bellows of the transmitter, a differential meter on both sides of the bellows drives a remote meter that the mechanical amplifying device uses a pointer to indicate the water level. Of course, it is also possible to convert the electrical analog quantity into a digital quantity. The above just conceptually illustrates the difference between a transducer and a transmitter.

transducers and transmitters are the concept of thermal instrumentation. It's just that the principle and application requirements are different, and it becomes different.

pressure transmitter vs. sensor

The above is the difference between the transmitter and the transducer for comprehensive analysis. The following is a list of some netizens' arguments.

1. (Reference) The transducer is composed of two parts, namely a sensitive element and a conversion element. Wherein the sensitive component refers to a portion of the transducer that can directly sense or respond to the measured component; the conversion component refers to a portion of the transducer that converts the measured or sensed response of the sensitive component into an electrical signal portion suitable for transmission or measurement. Since the output signal of the transducer is generally weak, it needs to be modulated and amplified. With the development of integration technology, people also installed this part of the circuit and power supply circuit inside the transducer. In this way, the transducer can output an available signal that is easy to process and transmit.

When the prior art is relatively backward, the so-called transducer refers to the sensitive component above, and the transmitter is the conversion component.

2, The transducer generally output 0~20MV, a lot of receiving devices can not accept, or can not control the signal very well, so it is necessary to amplify the signal, the transmitter is more than the transducer multiple signal amplifier, is to loose the module.