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Pressure transmitter operation principle and applications

Author: Date:2012-12-11 22:04:41
It's need to measure various types of power and the non-electric physical target in industry, such as current (AD), the voltage (VD), power (WD), the frequency (FD), the temperature (TT), the weight (LD), the position (PT), pressure speed (RT), the angle needs to be converted into the received DC analog electrical signals can be transmitted to a few hundred meters away from the control room or display device. This will be measured physical quantities converted into a DC signal that can be transmitted device called a transmitter. Usually divided into industry the electricity transmitter (common models such as: GP / FP Series, S3/N3 series, STM3 series, etc.) and non-power transmitter.
Traditional transmitter output DC signal 0-5V ,0-10V ,1-5V ,0-20mA ,4-20mA, etc., is currently the most widely used to transmit analog 4 ~ 20mA current. The industry's most widely used to transmit analog 4 ~ 20mA current. The reasons for the current signal is not susceptible to interference. And the internal resistance of the current source is infinite, lead resistance in series with the loop does not affect the accuracy of ordinary twisted pair can transmit a few hundred meters. The upper limit of 20mA is not enough to ignite the gas explosion-proof requirements: 20mA electric circulation off the spark energy. The lower limit is not taken 0mA because of normal working hours in order to be able to detect broken: not less than 4mA, when the transmission line fault breaker, loop current is reduced to 0. Often take 2mA break alarm value. Current transmitters to physical quantities converted into 4 ~ 20mA current output, is bound to have an external power source to power them.
The most typical transmitter requires two power cords, plus two current output line to take over a total of four lines, called the four-wire transmitter. Of course, the current output and power utilities a line (public VCC or GND) can save a line, called the three-wire transmitter. In fact, you may have noticed, the 4-20mA current transmitter power supply itself can be thought, as shown in Figure 1C. The transmitter circuit is equivalent to a special load special is that the current consumption of the transmitter sensor output varies between 4 ~ 20mA. The display instrument need only string in the circuit can be. The transmitter simply external two-line, which is called a two-wire transmitter. Industrial current loop standard lower limit 4mA, so as long as the scale range, the transmitter least 4mA supply. This makes it possible to design two-wire sensor.

In industrial applications, the measuring point is generally in the field, and the display device or the control devices are generally in the control room or control cabinet. The distance between the two may be a few dozen to a few hundred meters. At a distance of one hundred meters, eliminating the need for two wires means that the cost reduction of nearly hundred! Therefore, in the actual use of the two-wire sensor to get more and more applications. Edit this paragraph to identify the authenticity of transmitter market-oriented production, exacerbated by intense competition, the pros and cons of true and false is hard to determine, because of the transmitter edge disciplines, many of the works of designers this than strange, some manufacturers products industry level confuse and the civilian commercial level indicators (price of industrial-grade the civilian commercial grade 2-3 times) some manufacturers products can make a few cents LM324 and LM431 transmitter, do not believe, then you open look, you bought a few hundred dollars is not the LM324 and LM431, to such transmitters send you, you dare to use Ohm.

The author tries to 0.5 accuracy current and voltage transmitters, for example, to proceed from the following methods to Tell the pros and cons.
(1) The reference to be stable, 4mA corresponding input zero reference baseline instability, talk about how precision linear the cold boot Chung 3 points the 4mA zero drift varies no more than 4.000mA0.5%; (ie 3.98-4.02mA), the voltage drop across the load 250Ω on 0.995-1.005V, IC heart tablets abroad more expensive bandgap reference, each degree of change of the temperature drift coefficient of 10ppm;
(2) within the circuit Total current consumption <4mA plus tuning after the equal 4.000mA, The active rectifier filter amplifier constant current circuit is not due to the primary side input change current consumption changes with a constant current power supply IC heart tablets abroad;
(3) when the operating voltage 24.000V full scale 20.000 mA, the the full scale 20.000mA readings will not change due to load-0-700Ω change; varies no more than 20.000mA0.5%;
(4) when full scale 20.000mA, load 250Ω full scale 20.000mA, reading does not change due to the change of the working voltage 15.000V-30.000V; change does not exceed 20.000mA0.5%;
(5) when the primary side of the overload, the output current does not exceed 25.000mA +10% or less, otherwise for the PLC / DCS transmitter with 24V working power and A / D input clamp circuit damage due to excessive power consumption, another transmitter within the emitter follower output oils power too much damage, no A / D input clamp circuit suffer more;
(6) shall not be damaged when the working voltage of 24V then anti transmitter must have polarity protection;
(7) between the two lines due to lightning and induced surge voltage exceeds 24V clamp shall not damage transmitter; generally parallel between the two lines the 1-2 only TVS transient protection diode 1.5KE inhibit every 20 seconds, the impact of positive and negative pulse interval of 20 ms pulse width, transient withstand the impact of power 1.5KW- 3KW;
(8) product labeling linearity is 0.5% absolute error or relative error, according to the following methods to identify only a glance: comply with the following indicators are really linearity of 0.5%. primary side input zero output 4mA plus or minus 0.5% (3.98-4.02mA), load 250Ω on the pressure drop of 10% 0.995-1.005V primary side input output 5.6mA plus or minus 0.5% (5.572-5.628mA) load drop on the 250 ohm 8mA plus or minus 0.5% (7.96-8.04mA) 1.393-1.407V primary side input 25% output load 250Ω on the pressure drop of 50% 1.990-2.010V primary side input output 12mA plus or minus 0.5% (11.94-12.06mA 2.985-3.015V) the voltage drop across the load 250Ω primary input output 16mA plus or minus 0.5% (15.92-16.08mA 75%) load 250Ω on the pressure drop 3.980-4.020V primary side lose 100% output 20mA positive negative 0.5% (19.90-20.10mA) load 250Ω drop on the 4.975-5.025V
(9) to the primary side of the input current limit must be set out: the primary side input contained greater than 125% of the output overcurrent limit 25mA +10% ( 25.00-27.50mA) load 250Ω on the pressure drop for the 6.250-6.875V;
(10) induction surge voltage exceeds 24V with or without clamp distinguish: the output of the two-wire port and an AC 50V pointer table head with AC 50V connected two wires to instantly touches two-wire output port, to see whether the clamp, clamp how many volts can glance friends;
(11) with or without polarity protection discern: Ω multiplied 10K file multimeter positive and negative measurement line output port, there is always time Ω infinite resistance, there is a polarity protection;
(12) Promise output current prolonged short circuit protection: primary side input load, 100% or greater than 125% -200% overload the 250Ω short circuit, measuring short-circuit protection limits 25mA +10%;
(13) industrial level and distinguished civilian commercial grade: industrial grade operating temperature range is -25 degrees to +70 degrees the drift coefficient per unit change 100ppm, ie temperature 1 degree per degree change, accuracy changes for the ten thousandth; the civilian commercial grade operating temperature range is 0 degrees (or -10 degrees) to +70 degrees (or 50 degrees), the temperature drift coefficient per unit change 250ppm, temperature change of 1 degree per degree of precision changes to two; drift coefficient of the current and voltage transmitters can be more burdensome incubators or high temperature box to experimental verification.

Above 13 ways the same can be used to distinguish true and false pros and cons of other transmitter.

1. Precision: better than 0.5%;
2. Nonlinear distortion: better than 0.5%;
3. Rated working voltage: +24 V ± 20%, the limit operating voltage: ≤ 35V;
4 Power Consumption : static 4mA, dynamic, equal with the loop current, internal restriction 25mA +10%;
5. Rated input: 5A. . . . . . 1KA (38 specifications);
6. Perforation through the core hole diameter: 8,9,12,20,25,30 mm;
7 output form: two-wire the DC4 ~~ 20mA;
8. drift coefficient of output current: ≤ 50ppm / ° C;
9. response time: ≤ 100mS;
10. Input / output insulation isolation strength:> AC3000V, 1min 1mA;
11 output load resistance: RL = V + -10V/0.02 (Ω); Note: (1) the standard V +24 V when the load impedance of 700Ω; (2) RL = 250Ω conversion resistor 1 ~ 5V + copper resistance of two transmission lines. 12. Input overload protection: 30 times 1min; 13 output over-current limit protection: internal restriction 25mA +10%; Note: (1) international standard output overcurrent limit protection: internal limit 25mA +10%; (2) may customer requirements: internal limit 22mA +10%, 24mA +10%. 14 two-wire port transient lightning surge current TVS suppression protection: the TVS suppress the impact of current 35A/20ms/1.5KW; 15 two-wire port settings +24 V power supply reverse polarity protection; 16 output current long short circuit protection limits; internal limit 25mA +10%; 17 working environment: -40 ° C -80 ° C, 10% -90% RH; 18. storage temperature: -50 ° C to -85 ° C; 19. Executive Standard: GB/T13850 -1998; 20 series models, specifications, wiring diagram, product appearance, product photos, safety precautions. VIII. Illustrate the main features of the certain brand of industrial grade 0.5 accuracy current transducer What? 1 the True RMS two-wire transmitter designed for power automation 50/60Hz AC current measurement design; 2. Single turn perforation wear the core structure, the two parts of the current transformer and current transducer combination design; 3. has six comprehensive protection functions: (1) Input overload protection; (2), output over-current limit protection; (3), output current, long time short circuit protection; (4), two-wire port instantaneous state lightning surge current TVS suppression protection; (5), over-voltage limit protection ≤ 35V working power; (6), working power, reverse polarity protection. 4 two-wire output wiring is the most advanced of the current analog serial output, with six major advantages; (1), less susceptible to parasitic thermocouples and pressure drop along the wire resistance and temperature drift can be very inexpensive more fine twisted pair wire; (2), when the output of the current source resistance is large enough, by the magnetic field sensor coupled to the voltage within the loop of wire, does not produce a significant effect, because of the interference caused by the current is very small, generally use twisted-pair will be able to reduce interference; (3) capacitive interference resistance about the error will lead to the receiver, receiver for 4-20mA two-wire loop resistance is typically 250Ω (sampling Uout = 5V) small resistance not sufficient to produce significant errors, therefore, allows the wire length is longer than the voltage telemetry system farther; (4), each time a single display device or recording device can be carried in the cable lengths between the different channel for access not because of the wire length ranging between accuracy; (5), 4mA to zero level, so that the judgment conveyor line open or the sensor the damage (0mA state) very convenient. (6), in the two-wire output port easy addition of anti-surge, lightning protection devices, conducive to safe mine explosion. 5. Former deputy edge highly insulated isolation; 6 high reliability, high stability, high cost performance; 7. Especially suitable for generators, motors, low voltage distribution cabinet, air conditioning, fan, street lamps and other intelligent monitoring system of the load current. 8 ultra-low-power, single static 0.096W, full-scale power consumption of 0.48W, within the output current limit power consumption of 0.6W

Pressure Transmitter principle

Principle of capacitive pressure transmitter, capacitive pressure transmitter important to the completion of the pressure / capacitance conversion chamber sensing element and the capacitor converts the two-wire 4-20mA electronic circuit board, and when the process pressure from both sides of the measuring chamber (or side) is applied to the isolation diaphragm through the center of gravity of the silicone oil fill fluid transmitted chamber diaphragm, the center of gravity of the diaphragm is tensioned diaphragm edge, under pressure, the occurrence of the corresponding displacement, the displacement constitutes a differential capacitance changes, and experienced electronic circuit board conditioning, shocks and narrow, converted into a 4-20mA signal input, input current and inversely proportional to the process pressure to dispersed silicon pressure transmitter principle and use of the measured medium pressure indirect effects on the sensor diaphragm (stainless steel or ceramic) , so that the diaphragm of the micro-displacement is inversely proportional to the pressure of the medium, so that the resistance value of the sensor changes, and the electronic circuit detecting changes, and convert the input a specification of the measurement signal corresponding to this pressure.

Ceramic of pressure transmitters principle and liquid transfer, the indirect effects of pressure before the appearance of the ceramic diaphragm, the diaphragm occurrence huge deformation, thick film resistors printing the reverse side of the ceramic diaphragm pressure transmitter using anti-corrosion, converge into a Wheatstone bridge (closed bridge), due to the piezoresistive effect of the varistor, so that the bridge occurs a highly linear and inversely proportional to pressure, and encouragement voltage is also inversely proportional to the voltage signal, the specification signals in accordance with the pressure different calibration gas process 2.0/3.0/3.3mV/V can strain sensor compatible.
Sensor with high temperature stability and moment stability after laser calibration, sensor comes with temperature compensation from 0 to 70 ° C, and to medium indirect contact and the vast few.
Ceramic is a recognized high elasticity, corrosion resistance, abrasion resistance, shock and vibration. The ceramic heat solid characteristics and is a thick film resistor to be able to make it the task of temperature fields as high as -40 to 135 ° C, and having a high-precision measurement and high robustness. Electrical insulation level> 2kV input signal, temporary stability. High characteristics of low-cost ceramic sensor money will be to carry out the direction of the pressure transmitter, one-sided tendency to substitute other types of sensors in Europe and the United States, in China, more and more players use ceramic sensor instead of dispersed silicon pressure transmitter .
Measured media pressure transmitter two pressure into the high-pass, low-pressure chamber, the role of δ components (ie sensitive element) on both sides of the isolation diaphragm is transferred through the spacer and filling solution components to the measurement of film The tablets both sides. Measuring diaphragm and the electrodes on the both sides of the insulating sheet and each composed of a capacitor. When both sides of the pressure inconsistencies, resulting in the measuring diaphragm to produce displacement, the amount of displacement and is proportional to the pressure difference, and therefore both sides of the capacitance will not wait, is converted into a signal proportional to the pressure by the oscillation and demodulation link.
The pressure transmitter and the working principle of the absolute pressure transducer and differential pressure transmitter is the same, the difference is that the low-pressure chamber pressure is atmospheric or vacuum.
The A / D converter to the demodulator current is converted into a digital signal, its value is used by the microprocessor to determine input pressure value. Microprocessor control transmitter. In addition, the sensor linearization. Reset the measurement range. Engineering unit conversion, damping, prescribing, sensor trimming operations, as well as diagnostic and digital communication. The microprocessor 16 bytes of program RAM, and three 16-bit counter, one of the A / D conversion. D / A converter to the microprocessor by the tuning data of the corrected digital signal, the data available transmitter software modifications. The data is stored in EEPROM, preserved intact even after the power is turned off. Digital communication lines for the transmitter to provide a connection interface with external devices (such as the 275 smart communicator or HART protocol control system). This line detection digital signal superimposed on the 4-20mA signal, and the required information transmitted via the loop.

The type of communication is a frequency shift keying FSK technology and basis BeII202 standard. The purposes: pressure transmitter for measuring the pressure, volume, and absolute pressure of the gas, liquid and steam parameters, and then to convert it to a signal output of 4-20mA.DC. The pressure transmitter include GP type (gauge pressure) and an AP-type (absolute pressure) of two types. GP and AP and intelligent zoom plate combination, may constitute intelligent pressure transmitter, which can communicate with each other via the HART protocol manual operator to set and monitor the GP the δ room of the pressure transmitter, one side accept the measured pressure signal and the other side is through, and the atmospheric pressure and therefore can be used for the measurement table of pressure or negative pressure AP absolute pressure transmitter δ chamber side to accept the measured absolute pressure signal, and the other side is closed in a high vacuum reference chamber, it can measure the exhaust system, the absolute pressure of the distillation column, the evaporator and the crystallizer, etc.! Principle: used, capacitive, resonant beam spread sprinkle silicon several principle!

Capacitive pressure transmitter are mainly consisting pressure \ capacitance conversion chamber sensing element and the capacitor converts the two-wire 4-20mA electronic circuit boards! When the process pressure from both sides of the measuring chamber (or side) is applied to the isolation diaphragm, silicone oil fill fluid spread to the center of the chamber, diaphragm, center diaphragm edge tension of the diaphragm, under pressure to produce the corresponding displacement, the displacement form a differential capacitance change! And regulation of electronic circuit boards, shock and zoom! Converted into a 4-20mA signal output! Output current proportional to the process pressure! Degrees who can pressure into electrical signals can be called "pressure transmitter, it kind of is too much, each has its own specific works, from the measurement range of milligrams has been N tons are so specific, you can also talk about, the powerful balanced deformation (resistance strain), and so on. In short, they are output analog electrical signals, and then use the number / die (A / D) converter converts into a digital quantity and computer connection.
Many types of transmitters, overall, by the transmitter to send a signal to the secondary instrument display measurement data to the secondary instrument. Physical measurement signals or ordinary electrical signal is converted to a standard signal output can be output by way of a communications protocol device. Generally divided into: temperature / humidity transmitter, pressure transmitter, differential pressure transmitters, level transmitters, current transmitter power transmitter, flow transmitter, weight transmitters, etc.. Transmitter - follow the laws of physics (or experimental mathematical model) into a 4-20mA standard signal changes in physical device.
Transmitter sensor signal is converted to a uniform standard signal: the 0/4-20mADC ,1-5VDC, 0-10VDc transmitter: There enlarge addition to sensing function shaping function output is standard control signal. :4-20mA commonly used pressure transmitter principle and its application of a wide range of strain gauge pressure transmitter Principles and Applications of mechanical sensors, such as resistance strain gauge pressure transmitters, semiconductor strain gauge pressure transmitters, pressure resistive pressure transmitter, inductive pressure transmitter, capacitive pressure transmitter, resonant pressure transmitter capacitive acceleration sensor. But the most widely used is a piezoresistive pressure transmitters, it has a very low price and high precision and good linearity characteristics. Here we introduce this type of sensor. For piezoresistive pressure transmitter, the first to recognize this element of the resistance strain gauge. Resistance strain gauge is a strain change on the DUT converted into an electrical signal sensitive devices. It is a the piezoresistive strain transmitter major part of the. Application of resistance strain gauge metal resistance strain gages and semiconductor strain gauge two. Metal resistance strain gauges have the filamentous strain gauges and metallic foil-like strain gauge two. Is typically the strain gauge through a special binder close adhesion in the generated mechanical strain on the substrate, the resistance strain gauge with deformed when the base body by the force generating the stress changes, the resistance change of the strain gage, thereby change the voltage applied to the resistor.

This strain gauge resistance change in the force generated is generally smaller, generally such strain gauges are composed strain bridge and through subsequent instrumentation amplifier is amplified, and then transmitted to the processing circuit (typically the A / D converter and CPU) display or the implementing agency. The strain gage of the metal resistance of the internal structure shown in Figure 1 is a schematic structural view of the resistance strain gauge, which consists of a matrix material, the metal strain wire or strain of the foil, an insulating protective sheet and terminations portion. According to a different purpose, the resistance of the resistance strain gauge can be designed by the designer, but the range of values ​​of the resistor should be noted: the resistance is too small, the required drive current is too large, while the strain gages fever resulting in itself, the temperature is too high different environment changed so much, so that the resistance strain gages, output zero drift zeroing circuit is too complex. Too much resistance, impedance is too high, the poor ability of anti-electromagnetic interference from outside. Generally are about tens of ohms to several kilohms. The works of the works of the resistance strain gauge metal resistance strain gauge is adsorbed on the substrate material on strain resistance to the phenomenon of the change in resistance with mechanical deformation, known as resistance strain effect. Metallic conductor resistance value can be represented by the following formula: wherein: the ρ - metal conductor resistivity (Ω? Cm2 / m) S - a conductor cross-sectional area (cm2) L - the length of the conductor (m) metal The wire strain resistor, for example, when the metal wires by external force, and its length and cross-sectional area will be changed, can be easily seen from the above formula, its resistance value is changed, if the metal wires by external force elongation , its length increases, while the cross-sectional area is reduced, the resistance value will increase. Length decreases when the metal wires by external force to compress the cross-sectional increase, the resistance value is reduced. As long as the measure is applied to the change in resistance (usually to measure the voltage across the resistor), get the the strain wire strain Love, ceramic pressure transducer principle and application of anti-corrosion, there is no transfer of the liquid in the pressure transmitter, the pressure acts directly on the front surface of the ceramic diaphragm, the diaphragm generates a minute deformation of the thick film resistors printed in the back surface of the ceramic diaphragm, connected into a Wheatstone bridge (closed bridge), due to the piezoresistive effect of the varistor produce a pressure proportional to the height of the linear, so that the bridge with the excitation voltage is proportional to the voltage signal, the standard different calibration of the signal according to the pressure range of 2.0 / 3.0 / 3.3 mV / V, etc., can be, and the strain gage sensors relative compatible. Laser calibration, the sensor has high temperature stability and time stability sensor comes with temperature compensation from 0 to 70 ° C, and the vast majority of media and direct contact. The ceramic material is a recognized high elasticity, anti-corrosion, anti-abrasion, impact and vibration. -40 To 135 ° C operating temperature range of the thermal stability characteristics of the ceramic and is a thick film resistor can make up, but also having a high-precision measurement and high stability. The degree of electrical insulation> 2kV, the output signal is strong, long-term stability. High features, low price ceramic sensor will be the development direction of the pressure transmitter, a comprehensive alternative to other types of sensors in Europe and the United States, more and more users in China also diffused silicon pressure transmitter with ceramic sensor replacement. 3, diffusion the silicon pressure transmitter principle and application works measured media pressure directly acts on the sensor diaphragm (stainless steel or ceramic), so that the diaphragm to produce micro-displacement proportional to the medium pressure, so that the resistance value of the sensor change, and the use of the electronic circuit detects this change, and converted to output a the standard measurement signal corresponding to this pressure. Sapphire pressure transducer principle and application of the use of strain resistance works, the use of silicon - sapphire as semiconductor sensitive components, with unparalleled measurement characteristics. Sapphire by monocrystal insulator elements, hysteresis, fatigue, and creep phenomenon does not occur; sapphire than silicon to be sturdy, and higher hardness, the afraid deformation; sapphire has a very good flexibility and insulation properties (1000 OC or less), and therefore, using silicon - sapphire sensitive element of a semiconductor manufacturing, on the temperature change is not sensitive even at high temperature conditions, also has a good working characteristics; highly radiation-resistant characteristics of the sapphire; addition, silicon - sensitive element of sapphire semiconductor pn drift Therefore, to radically simplify the manufacturing process, improve repeatability and ensure a high yield. The silicon - sapphire semiconductor sensitive components manufacture of pressure sensors and transmitters, in the worst working conditions, and high reliability, good accuracy, the temperature error is very small, cost-effective. Constituted by the dual-diaphragm gauge pressure transducers and pressure transmitters: measuring diaphragm and titanium alloy titanium alloy receiver diaphragm. Printed with a the heteroepitaxial strain sensitive bridge circuit sapphire sheet, is welded to the titanium alloy measuring diaphragm. The measured pressure is transmitted to the receiving diaphragm (the receiver diaphragm and the measuring diaphragm between Tie sturdy connected together). Under pressure, titanium receiving the diaphragm is deformed, the deformation after the perception of the the silicon - Sapphire sensitive element, the electrical bridge output will change, and the magnitude of the change is proportional to the measured pressure. The sensor circuit is able to guarantee the strain bridge circuit power supply and strain bridge imbalance signal is converted to the uniform electric signal output (0-5,4-20 mA or 0-5V). In absolute pressure transducers and pressure transmitters, the sapphire sheet, glass solder pole with the ceramic base are connected together and played a role of the elastic element, the measured pressure is converted to a deformation of the strain gages, so as to achieve the purpose of the pressure measurement. 5, the main use of a piezoelectric material of the principles and application of the piezoelectric sensor of the piezoelectric pressure sensor comprises quartz, sodium potassium tartrate, and ammonium dihydrogen phosphate. Wherein the quartz (silica) is a natural crystal, the piezoelectric effect is to be found in this crystal, there has been within a certain temperature range, the piezoelectric properties, but after the temperature exceeds this range, the piezoelectric properties is completely disappeared (the high temperature is called the Curie point "). With the stress varying electric field varied slightly (also said piezoelectric coefficient is relatively low), quartz gradually other piezoelectric crystal replaced. And sodium potassium tartrate have great piezoelectric sensitivity and a piezoelectric coefficient, but it can be applied only in a relatively low ambient temperature and humidity environment. Ammonium dihydrogen phosphate are artificial crystal, able to withstand the high temperature and relatively high humidity, and so has been widely applied. The piezoelectric effect is also applied on the polycrystalline, such as a piezoelectric ceramic including barium titanate piezoelectric ceramic, formate-based piezoelectric ceramics, piezoelectric ceramics of lead magnesium niobate, etc.. The piezoelectric effect is the main working principle of a piezoelectric sensor, a piezoelectric sensor can not be used for static measurements, because after the charge after the external force is applied, and only in the circuit has an infinite input impedance only save. The actual situation is not like this, so this decision to the piezoelectric sensor can only measure the dynamic stress. The piezoelectric sensor is mainly used in the measurement of acceleration, pressure and force. A piezoelectric acceleration sensor is a commonly used accelerometer. It has a simple structure, small size, light weight, long life and excellent features. Piezoelectric acceleration sensor vibration and shock measurements in aircraft, automobiles, ships, bridges and buildings has been a wide range of applications, especially in the fields of aviation and aerospace more of its special status.

The piezoelectric sensor can also be used to measure the internal engine combustion pressure measurement and the measurement of the degree of vacuum. Can also be used in the military industry, for example, use it to measure the moment of firing guns and bullets in the barrel bore pressure change and pressure of the shock wave of the muzzle. It can be used to measure a large pressure, can also be used to measure a minute pressure. Piezoelectric sensors are also widely used in biomedical measurements, for example, the the ventricular catheter decline damper is made of piezoelectric sensors measure dynamic pressure is so common piezoelectric sensor applications is very broad