What is the characteristics of strain pressure sensor

Pressure sensor is a kind of commonly used sensors, widely used in medical, ships, aerospace, petrochemical, machine tools and other industries. Pressure sensors need to know when in use of knowledge is also a lot of, among them the characteristics of strain pressure sensor for users is also a need to understand, here is for everyone to introduce what is the characteristics of strain pressure Automobile Temperature Sensor.The measuring range of the pressure sensor is twice as big as the inductive sensor, it can not only detect metal target, but also detect dielectric, such as paper, glass, wood and plastics, and even can be detected by a wall or paper shell. Because the human body in low frequency is equal to the electrical conductor, thus can be used for the quiver measurement and alarm.
In the measurement of strain, the strain gauges can be on the component, but if the measuring force, pressure, acceleration, should first change the physical quantity measuring strain, and strain gage, a conversion process more than direct measurement, to complete the conversion process is usually called the original as the elastic elements, therefore, the strain Camshaft Position Sensor is usually made of elastic sensitive components and the strain gauge is composed of two parts.
Elastic sensitive element is a core component of sensor, elastic component of elastic energy storage requirements high, usually expressed as elastic material storage and deformation work without permanent deformation. Pressure sensor has good mechanical processing and heat treatment performance, has high compressive strength. Influence of temperature and other characteristics, correct choice of elastic sensitive components and strain gauge bridge is an important way to improve the strain sensor:
1 measuring range, high precision, the force sensor can measure the force of 0.01--1000000N, the accuracy can reach more than 0.05%FS; the pressure sensor can measure the pressure of 0.1-1000000, the accuracy can reach 0.1%FS.
2, stable and reliable performance, long service life, such as weighing type mechanical lever, the lever, the knife edge part of mutual friction loss and deformation, we want to maintain its accuracy is quite difficult, using resistance strain weighing sensor made of electronic pump, truck scale, railway scale, long-term stable operation in harsh environmental conditions.
3, the frequency response characteristic of excellent. Pressure sensors of resistance strain gauge response time is 0.01MS, the dynamic process of semiconductor strain gauge can reach strain sensor if 0.001MS can take measures in the elastic component is constitute by them can be measured in tens or even hundreds of Hertz hz.

Building materials used in the experiments

In building materials , especially concrete drying process, we should pay attention to the drying trend, which is one of the indicators of the evaluation of products, but also for the construction side to provide a reliable data. Application of temperature and humidity Crank Shaft Position Sensor can record this data and provide building materials research side , the construction will provide useful help . Especially in military construction , time is life , accurately grasp the concrete drying time is starting cause the enemy , in order to effectively provide the vital forces on the battlefield to provide a guarantee , this feature can be completed by the temperature and humidity Crankshaft Positioning Sensor. Monitoring and recording of temperature , can confirm its quality assurance Immunization . Temperature and humidity sensors convenient and reliable solution to this problem. Different vaccines , the vaccine with different storage temperature requirements . To ensure that bacteria, vaccine safety during storage and transport , and storage and transportation process must be carried out to detect the ambient temperature record of the whole process , and should be fully automated detection recording , there should be no human factors , in order to improve data reliability. High quality precision temperature and humidity sensors can perfectly accomplish this function , because it can also be a long record in the absence of external power supply situation.

The role of the crankshaft sensor

An engine ignition time ( say a little simple, it is the moment of spark ignition , the corresponding crankshaft position ) , is to be very accurate ( correct to say that there is a range in which the crankshaft to an angle within the range requiring Fireworks plug ignition , not to this position the crankshaft , the ignition spark plug , the engine is possible that the normal work ) , the carburetor before the car, with a mechanical power switch to control the spark plug , Just go to Camshaft Position Sensor , spark plugs will ignite. . . Now all electronically controlled , and , then , go to the computer you want to know what the crankshaft angle ( position ) , you can only think of ways to engage an electrical signal , let the computer know what angle to the crankshaft in the end , but to the best one ignition position , the computer controlled ignition . . . . Second, the crankshaft position only to have strict requirements ignition timing , fuel injection is relatively minor, because , injection slowly earlier , the impact of work on launching fee is not great, but , if ignition is not normal , then a great impact . Third, there is a common crank Car Temperature Sensor , electromagnetic ( on a side of the crankshaft gear . Front chainring ) , a simplified physical model is a small permanent magnet generator , it is the most common kind , ,,, , the other type of photoelectric ( a small disc , open at the many small holes in the upper and lower plate , mounting points corresponding to the device and the photosensitive device , a light emitting element , the light emitted when the circle hole position to the disk , the light shine on the photosensitive member following the reception of light ) , light is actually a simplified model of the battery , there is a Hall sensor . . , Swiss road running car , more than 95 % of all first .

Air temperature sensor

Automatic air conditioning system temperature sensor includes : engine coolant temperature sensor , in-car temperature Sensor Camshaft , ambient temperature sensor , evaporator temperature sensor. According to these sensor signals the control unit calculates the desired blowing air inside the cabin temperature , select the desired amount of air , and then control the air mixture inlet valve, out of air intake converter board , etc., within the temperature range set by the driver automatically adjust the temperature inside the cabin , to achieve the best , and automatic control of air conditioning on and off. One condition is that the air conditioning system refrigerant temperature higher than the room temperature, the ambient Engine Water Temperature Sensor circuit , the terminal water , poor contact or poor ground , the data stream will be displayed below the ambient temperature -30 ℃, will cause no refrigeration . Meanwhile, the engine coolant temperature sensor circuit or ground wire is bad, the signal loss of time, the cooling fan does not turn , lead to poor air conditioning cooling, will enter the fail-safe , so air conditioning stopped working

Motor bearing temperature sensor installation and use

Measurement of motor bearing temperature, the sensor junction box installed in the appropriate position of motor,Tighten the connecting screws, connecting wire.The temperature sensing element transducer (probe) is inserted into the screw hole in the vicinity of the motor bearings (such as motor casing, shaft casingdrilling), and tighten the mounting nut.The junction box of Shaft Position Sensor is opened, will leadcable connected, theboxcover,willleadto thecable to designatedlocations and intrinsically safe type two meter connectioninstallation lead atCoolant Temperature Sensor intervals of 300mm head is fixed by binding, wire spring tubebending radius is not less than 60mm, lead too long can pull ring in the right place,and far from the heating equipment.

If you choose "not moving" nut installation, the installation must first install theprobe part, then mounted junction box

Capacitance weighing sensor's faults

No matter what the sensor has its own advantages and disadvantages, the weighing sensor is the same, it is mainly used to quality signals into electrical signals, the advantages of capacitance sensor is low power consumption, low cost, what are the disadvantages of it, we come to understand in detail. Disadvantages: high output impedance, low load capacity
Capacitance Cooling Temperature Sensor capacity by the electrode geometry restriction very difficult to do, generally tens to hundreds of micro method, even only a few micro method. Therefore, the output impedance capacitive weighing sensor is high, so the load capacity is poor, vulnerable to outside interference produced unstable phenomenon, serious and even unable to work. We must take shielding measures properly, to design and the use of inconvenience. Capacitance sensor also requires insulation resistance value is extremely high, otherwise the insulation performance of part as bypass resistance and affect the instrument, so we should also pay special attention to the surrounding environment such as temperature, cleanliness, etc.. If the use of high frequency power supply, can reduce the output capacitance weighing sensor resistance, but the high frequency amplifier, sensor than low frequency complex, and the effect of parasitic capacitance, is not easy to ensure the stability of the work. Two shortcomings: the output characteristics of output characteristics of nonlinear capacitance weighing sensor is nonlinear, although the use of differential type to improve, but can not be completely eliminated.Engine Coolant Temperature Sensor for other types of only ignores the edge effect of electric field, the output characteristics is linear. Additional capacitance or the edge effect will be directly superimposed sensor capacitor, the output characteristics of nonlinear. Disadvantages: three parasitic capacitance effect of initial capacitor capacitance weighing sensor is small, and the lead capacitance, electronic circuit connected with the sensor and the electronic circuit of the stray capacitance and inside Coolant Temperature Sensor plate and the surrounding conductors capacitors and other so-called missing large parasitic capacitance, not only reduces the sensitivity of the sensor, and the capacitance is often random variation the instrument, work is not stable, influence the accuracy of measurement. So the cable selection, installation, connection method has strict requirements. For example, with good shielding property, its small distributed capacitance of high frequency electric wire as the lead, lead is thick and short, to ensure the instrument stray capacitance is small and stable and so on, otherwise it can not guarantee the high measurement precision. It should be pointed out that, along with the material, technology, electronic technology, especially the rapid development of technology, the capacitance weighing sensor has been developing and constantly overcome shortcomings. The capacitance sensor is becoming a high sensitivity, high precision, low pressure sensor in dynamic, and some special measurement has a promising.

How to choose the flow sensor

Flow sensor how to choose ? Information technology is a major force in the computer, communications technology, then there is a sensor , the sensor market promising, with advances in technology , increased levels of automation , our special attention to development of sensors . Test procedures and standards are flow sensor flow meter can accurately measure of protection. In many areas of the economy , the flow of accurate measurements have become very important , for example: environmental monitoring , health care , security , and trade settlement and so on. Why do you want to develop a Engine Temperature Sensor ? Now , product type flow sensor has been increasing, and almost every year there will be a number of new sensors for your choice . These sensors have their own economic and technical characteristics. Therefore, consumers should be generous to accept their presence , so you can successfully promote the great advances in technology . However, the new sensors are not necessarily mature technology , a lot of new products out of the technology was not mature enough , but not to promote technological progress, so that either improve them or let them social outcasts . Some flow sensor is not sufficient in many occasion in experiments conducted in the laboratory, but only some of the experiments on the market . In fact, these sensors , there are still many unknown factors, but does not have the national conditions of some of the technical regulations . Therefore, Positioning Sensor should be prohibited extensive promotion and application , otherwise , it brings the community is definitely a bad influence. According to the nature of the flow sensor standard classification , can be divided into the following categories . Method Standard : Engine Water Temperature Sensorcalculation method, detection methods , test methods and performance assessment methods, etc. ; basic standards : Some basic parameters of the sensor specifications , models, naming, and in the measurement process jargon ; product standard : it provides sensor technology requirements, acceptance of rules , test methods and product categories , in addition , there are proper installation and use requirements, etc. There are some standard that only the correct installation and use of technology, which is the product of the nature of the standard product applications .

The performance of all kinds of different digital sensors , should be based on different applications

The performance of all kinds of different digital sensors , should be based on different applications , use of different digital speed sensors. Several major applications are presented . 1 , analog DC motor speed control DC motor speed control analog feedback with analog voltage and frequency in two ways. The former DC tachometer generator as a Engine Coolant Sensor , because the DC tachometer generator inherent defect, so that people consider using other types of speed sensor as a speed feedback . Wherein the speed feedback element is a magnetic sensor via digital speed F / V conversion , and filtered into a DC level back to the comparing circuit for controlling the rotational speed . The speed control method is not only simple , reliable, and low cost.
2, the DC motor incremental motion control with high precision for complex control applications requires the use of incremental motion control methods to meet system requirements. Incremental motion control only controls the speed of movement , but also for positioning control and frequent starts and stops acceleration and deceleration control . The speed feedback system with digital Coolant Temperature Sensor output digital signal that can achieve these various control requirements. Incremental movement of the DC motor speed control system in the encoder sensor digital Camshaft Position Sensor. Speed ​​digital speed sensor output signal is fed to the comparison circuit and a regulating circuit , to meet the fast high-precision servo control, and requirements for wide speed control , which is often used in modern incremental movement speed feedback method . 3, the phase lock servo motor speed control system is controlled by the speed feedback to regulate due to mechanical loads or changes in the environment caused by such speed deviation . This method of control is to regulate the nature of the case of a difference , speed accuracy is not high, although the number may be used to improve the accuracy of incremental control , but still can not meet the high precision speed control requirements. The lock-in technique for speed control , can achieve synchronous motor control is achieved without droop . Lock-in technique to compose for servo controlling the phase lock servo control system, which phase lock loop is determined by the reference frequency generator , an encoder , a phase frequency comparator , a low pass filter, amplifier and DC motors and other components.

Tilt sensor on the railway bridge machine application

Railway bridge is a machine for railway bridge construction on the common construction machinery , railway bridge machine in the railway tracks on the road, will make the beams onto the bridge piers , and its main function is to beams filed after delivery to a fixed position down. Erecting machine work great mechanical strength , and every time you need to run a large number of objects and even large tonnage , erecting machine to be hanging beams through the bridge embankment on the bit , and take line high center of gravity and axle load , with the massive there may be roadbed and line quality is poor, such as the curved section outer rails high enough to cause the body tilt cause side friction is large , if the friction is more serious and may lead to unnoticed after overturning accident , the line will lead to uneven slope erecting machine slippery , making it appear forward phenomenon, coupled with factors such as human and prone to dangerous accidents to predict in advance , using the tilt sensor is a good solution Camshaft Position Sensor is used to specifically measure the tilt Cooling Temperature Sensor is able to measure the tilt angle of the object and bridges , real-time monitoring erecting machine tilt angle , and monitor the data transmitted to the control room, adjusted according to actual situation monitoring personnel working status , to security monitoring. Advantages of high-precision analog and digital Engine Coolant Temperature Sensor output single -axis output selectable multi-range selection, free custom enclosure rating high sensitivity, zero correction 40 ~ +85 ℃ temperature compensation module-level static, lightning protection, overvoltage protection, surge protection .

Rocket technology sensor applications

Rocket launch is like a dragon is never caught not come, in fact, on the rocket in order to ensure safe flight of astronauts to provide accurate input data , the rocket on the various types of sensors , converters play an important role in sensor in the end what kind of role play it , and today China sensors trading network came to tell you about it. Various types of Automobile Temperature Sensor on the rocket , mostly installed inside the key parts of the rocket , they perceived the arrow on the physical changes responsible for the physical quantity conversion converter to achieve the transmission signal supplied to the control system of the rocket and ground control center as a basis to judge , like a change in both eyes fixed targets for the command center to provide a basis to predict . Speaking of rockets internal sensor , manifold variety. Working principle of a capacitive , resistive , optical type , indicators measured pressure, displacement , strain, physical monitoring the acceleration , position, temperature , noise, vibration , etc. aspects. Wide range of Camshaft Position Sensorin the rocket world, there are several categories is particularly important, it is a direct monitoring data reflect the status of the rocket is safe . Acceleration sensor lifesaving escape criterion for the rocket escape system provides important parameters , when the rocket a serious failure , endangering the safety of astronauts , it will show the acceleration deviation from the design value , the sensor will sense this change the first time , and issued signal initiates escape procedures to help astronauts quickly out of the woods . Using the system with level Automotive Temperature Sensors for measuring the remaining amount of propellant level measurement , real time, continuously , accurately provide information on the remaining amount of liquid propellant , controls the engine adjusting valve or open or closed , monitoring the flow of propellant mixing ratio of the engine keep tank oxidant , the mass ratio of the combustion agent is within the optimal range . Vibration and noise is the rocket invisible killer , though does not seem to explode so violently cruel, but the astronauts of the body is also very large destructive . In order to ensure the rocket during flight vibration and noise generated by the human body can not exceed acceptable levels , improve ride comfort of astronauts , rockets also set up a special monitoring vibration and noise of the sensor. Rumbling avalanche of orange flame , daring and took away all eyes , a small sensor on the huge rocket body seem insignificant , but they are protecting the safety of the astronauts unsung heroes in the thousands of degrees of broiled high stick to their posts , so vacated became an astronaut flying dragon tame car.

The sensor and transmitter are thermal instrumentation concept

The sensor and transmitter are thermal instrumentation concept. Sensors are the non-electric quantities such as temperature, pressure, level, material, gas characteristics into electrical signals or physical quantities such as the pressure, level, etc. directly to the transmitter. Transmitter is Crank Position Sensor to the weak signal amplification in order to transfer or start control components. Or to the non-power sensor input into electrical signals while amplifying remote measurement and control in order for the signal source. According to the analog can be converted into a digital value. Together constitute a sensor and transmitter control monitor signal source. Require different quantities of different Crank Shaft Position Sensor and the corresponding transmitter. There is also a transmitter is not a physical quantity into an electric signal, such as A boiler water level of the "pressure transmitter" he is to the lower level sensor in the water and steam condensate water through the upper portion of the instrument tube to the the transmitter side bellows, the bellows side of the differential to drive the mechanical amplification means a pointer indicating a distance meter level. Of course, there are quantitative replaced the electrical simulation can also be called the digital transmitter. These are just a conceptual description of the difference between the sensor and transmitter.

Automobile Temperature Sensor Sensors: automatic transmission torque converter failure Driving jitter

For vehicles equipped with automatic transmissions , the lock-up clutch failure on the vehicle will have a huge impact . The lock-up clutch of the common faults are: lock-up clutch does not engage , can not be separated , poor bonding and slippage . Its symptoms varied, so grasp it works , characteristics and failure analysis method is very important. Maintenance personnel have been to a 1996 Ford Windstar models cars. When the vehicle is in the middle and high speed vehicles jitter , feels like engine shake and commit the same seat . According to the car speakers this fault has been repaired in several other repair shop , replacement parts on the engine a lot , but the symptoms point is not improved. First, the road test , the vehicle 40-80km / h between the irregularly appear jitter. First testing the engine , but no failure. At this time considerations may be caused by other factors . Then connect the computer to read the data stream detector , found that when the lock-up clutch (tcc) bonding , especially when connected to Taiwan to 40 % -60 % of the time , the vehicle will appear jitter. Thereby determine the fault is caused by a bad combination tcc . But bad turn, end table which part is causing it ? Fault may lie electronically controlled , hydraulic and mechanical systems which part . Of course, there are some special circumstances, such as when the throttle is closed, apply the brakes , acceleration or deceleration , shift , oil temperature below 60 ℃ Rotary temperature is too high and gear in the following block 3 , etc., because these time lock the clutch is engaged . Lockup clutch engagement and disengagement by a computer (pcm) via lock-up clutch (tcc) between solenoid controlled . Computer according to the throttle Automobile Temperature Sensor , speed sensor , a turbine axis sensor , gear, shift time and the brake switch signal is analyzed to provide tcc solenoid duty cycle signal , changing the tcc solenoid valve opening degree , thereby controlling operation of the clutch . For the tcc 's work, the computer is the engine speed and the turbine shaft ( input shaft ) to monitor the speed difference . When the lock-up clutch does not operate , the engine speed should be greater than the turbine shaft speed 200-300r/min; the lockup clutch engagement process, the speed difference between the two should be gradually reduced ; when the lockup clutch is fully engaged , the two speed difference should be essentially zero . Therefore, by observing the engine speed and the turbine speed ( input shaft speed ) to determine the difference between the clutch state and the good or bad . In determining the number of lock-up clutch is not engaged or when a fault can not be separated , can be connected to the transmission detector (a kind of the solenoid valve can control the working detection tool ) , disconnect the computer control of the transmission , clutch control solenoid valve artificially work , in order to determine the control part of the fault , or to perform part of the fault . If artificially controlled clutch solenoid valve work the problem persists , indicating that the electronic control part is no problem. If the fault lies in the electric control part , you should first check the influence of the work tcc signals provided by each sensor is normal, then check whether pcm signal at each Crank Sensor to work properly , the final check wire connections are good. On the hydraulic part of the fault can be determined by measuring the hydraulic pressure . So this car gearbox oil pressure test carried out . Road test , jitter occurs when engaging in tcc and found no oil pressure fluctuations and anomalies. To further determine if this part is faulty hydraulic transmission , fold down the valve and install test template , using compressed air to be tested. The results show the various hydraulic valves and valve body tcc oil works well , the hydraulic part of the fault can be basically ruled out the possibility . As for the mechanical part , unable to disassemble , so only through the exclusion of other aspects of the failure to determine. Through the above aspects of the testing and analysis, maintenance personnel may only determine the fault lies in the mechanical part , i.e., the torque converter lock-up clutch . Here to remind the majority of maintenance personnel , inability to disassemble the torque converter , so it should be noted that the transmission torque converter maintenance cleaning problems and prevent foreign matter from entering and damaging the torque converter lock-up clutch . For oil drain plug torque converter , when found oil has changed , it should open the drain plug , use new oil repeatedly washed ; no drain plug for the torque converter , you can use high-pressure air inversion method of cleaning

diffused silicon pressure sensor principle and application

Measured media pressure directly on Engine Temperature Sensors diaphragm ( stainless steel or ceramic ) , the diaphragm will produce medium pressure proportional to the micro-displacement , the sensor's resistance to change , and the use of electronic circuit detects this change and a conversion output of the pressure corresponding to the standard measurement signal.
Schematics

Gas sensor detection principle

Detect the concentration of gas depends on the gas detection transmitter , the sensor is the core part , in accordance with the detection principle different, mainly divided metal oxide semiconductor sensors , catalytic combustion Camshaft Position Sensor , gas sensor constant potential electrolysis , Buddha Galvani battery oxygen sensor , infrared sensor , PID photoionization sensor , etc. Following is a brief overview of the principles and characteristics of various sensors .

Automotive Sensors: automatic transmission torque converter failure Driving jitter

For vehicles equipped with automatic transmissions , the lock-up clutch failure on the vehicle will have a huge impact . The lock-up clutch of the common faults are: lock-up clutch does not engage , can not be separated , poor bonding and slippage . Its symptoms varied, so grasp it works , characteristics and failure analysis method is very important. Maintenance personnel have been to a 1996 Ford Windstar models cars. When the vehicle is in the middle and high speed vehicles jitter , feels like engine shake and commit the same seat . According to the car speakers this fault has been repaired in several other repair shop , replacement parts on the engine a lot , but the symptoms point is not improvedFirst, the road test , the vehicle 40-80km / h between the irregularly appear jitter. First testing the engine , but no failure. At this time considerations may be caused by other factors . Then connect the computer to read the data stream detector , found that when the lock-up clutch (tcc) bonding , especially when connected to Taiwan to 40 % -60 % of the time , the vehicle will appear jitter. Thereby determine the fault is caused by a bad combination tcc . But bad turn, end table which part is causing it ? Fault may lie electronically controlled , hydraulic and mechanical systems which part . Of course, there are some special circumstances, such as when the throttle is closed, apply the brakes , acceleration or deceleration , shift , oil temperature below 60 ℃ Rotary temperature is too high and gear in the following block 3 , etc., because these time lock the clutch is engaged .Lockup clutch engagement and disengagement by a computer (pcm) via lock-up clutch (tcc) between solenoid controlled . Computer according to the throttle position sensor , speed sensor , a turbine axis sensor , gear, shift time and the brake switch signal is analyzed to provide tcc solenoid duty cycle signal , changing the tcc solenoid valve opening degree , thereby controlling operation of the clutch . For the tcc 's work, the computer is the engine speed and the turbine shaft ( input shaft ) to monitor the speed difference . When the lock-up clutch does not operate , the engine speed should be greater than the turbine shaft speed 200-300r/min; the lockup clutch engagement process, the speed difference between the two should be gradually reduced ; when the lockup clutch is fully engaged , the two speed difference should be essentially zero . Therefore, by observing the engine speed and the turbine speed ( input shaft speed ) to determine the difference between the clutch state and the good or bad . In determining the number of lock-up clutch is not engaged or when a fault can not be separated , can be connected to the transmission detector (a kind of the solenoid valve can control the working detection tool ) , disconnect the computer control of the transmission , clutch control solenoid valve artificially work , in order to determine the control part of the fault , or to perform part of the fault . If artificially controlled clutch solenoid valve work the problem persists , indicating that the electronic control part is no problem. If the fault lies in the electric control part , you should first check the influence of the work tcc signals provided by each Camshaft Position Sensor is normal, then check whether pcm signal at each Engine Coolant Temperature Sensor to work properly , the final check wire connections are good On the hydraulic part of the fault can be determined by measuring the hydraulic pressure . So this car gearbox oil pressure test carried out . Road test , jitter occurs when engaging in tcc and found no oil pressure fluctuations and anomalies. To further determine if this part is faulty hydraulic transmission , fold down the valve and install test template , using compressed air to be tested. The results show the various hydraulic valves and valve body tcc oil works well , the hydraulic part of the fault can be basically ruled out the possibility .As for the mechanical part , unable to disassemble , so only through the exclusion of other aspects of the failure to determine. Through the above aspects of the testing and analysis, maintenance personnel may only determine the fault lies in the mechanical part , i.e., the torque converter lock-up clutch .Here to remind the majority of maintenance personnel , inability to disassemble the torque converter , so it should be noted that the transmission torque converter maintenance cleaning problems and prevent foreign matter from entering and damaging the torque converter lock-up clutch . For oil drain plug torque converter , when found oil has changed , it should open the drain plug , use new oil repeatedly washed ; no drain plug for the torque converter , you can use high-pressure air inversion cleaning method .

The humidity sensor performance in several ways to make a preliminary judgment

In actual humidity sensor calibration difficult circumstances, through a number of easy ways for humidity sensor performance judgment and inspection. Consistency test, the same type, the same manufacturer humidity Car Temperature Sensor preferably a purchase two or more products, the more illustrative, energized together comparator detects the output value, in a relatively stable condition, the consistency of observed test. If further testing, within 24h intervals between records within a day generally have high, medium and low three kinds of humidity and temperature conditions can be more comprehensive view of product consistency and stability, including temperature compensation feature. Breathe through your mouth, or use other means of Engine Water Temperature Sensor humidification humidification, observe its sensitivity, reproducibility, up off the wet wet performance, and resolution, the highest range of products and so on. Right product for the open box and closed box two cases tested. Comparison is consistent, the situation observed thermal effects. The product at high temperature and low temperature (according to the instructions standard) to be tested and restored to the normal state of the record before the experiment to detect and compare the test product temperature adaptability, and observe the product consistency condition. The performance of the final product quality inspection departments should be based on regular comprehensive means test. Using saturated salt solution for calibration, brand-name products can also be used for comparison testing, the product should be carried out during long-term use of a more comprehensive long-term calibration to determine the quality of the humidity sensor

Pressure Sensor what common faults

Pressure Sensor Troubleshooting What ? Matter what sensor is not a permanent shelf life for its failure, we want to treat , here to talk about the pressure sensor of the common faults .1, the pressure up , the transmitter output falters
In such cases, you should first check the pressure connections for leaks or is blocked, if confirmation is not , check the wiring and check the power supply , such as the power supply is normal to see whether the output is a simple pressure change , or view the output of the sensor if there is zero , if there is no change in the sensor is damaged , it may be damage to the instrument or other aspects of the whole system problems ;2, the pressure sensor seal problems
Pressure transmitter output does not change, then a sudden change in pressure transmitter output , the transmitter zero relief go back , most likely the pressure sensor gasket issue. Common reason is due to seal specifications , tighten the sensor to Engine Water Temperature Sensor after the sealing ring is compressed impulse blockage sensors inside the mouth , the pressure medium is pressurized get in, but when the pressure suddenly rushed to open the seals, the pressure sensor under pressure changed. The best way to troubleshoot is to remove the sensor , a direct look at the zero level is normal , if normal replaceable seals zero again ;3 , the transmitter output signal instability
Such failures are willing to question the source of stress . Pressure source itself is an unstable pressure , most likely meter or pressure sensor anti-jamming capability is not strong , Engine Temperature Sensor itself is very powerful and vibration sensor failure ;4, the transmitter and the gauge pointer control large deviationDeviation is a normal phenomenon , can confirm the normal range of deviation ; final failure is prone to micro- differential pressure transmitter installation location of the zero output. Differential Pressure Transmitter measuring range due to its small transmitter sensing element will affect the micro- differential pressure transmitter output. Pressure transmitter should be installed so sensitive axially perpendicular to the direction of gravity , adjusted after mounting the transmitter to the standard value of zero .The content is the commonly used four common pressure sensor failure, we normally use pressure sensors are made ​​of piezoelectric effect , so that the pressure sensor is also commonly referred to as piezoelectric sensors .

Role of Sensors

China's industrial production gradually become automated, intelligent is a developing trend , in the final analysis , are inseparable from the sensor 's credit, particularly in the application process, the effect is significant , can not be ignored .With the arrival of the new technological revolution , the world has begun to enter the information age . In the use of information in the process, we must first solve is to obtain accurate and reliable information, and the sensor is to obtain information in the field of natural and produced major ways and means . Industrial production , especially in the modern automated production process, use a variety of Auto Temperature Sensorto monitor and control the various parameters of the production process , so that the device operates in the normal state or the best condition , and to achieve the best quality products . Therefore we can say , without a large number of excellent sensors, modern production loses its foundation.Interdisciplinary research in basic , Crankshaft Sensors is more prominent position. The development of modern science and technology into many new areas: for example, at the macro level to observe the vast universe of thousands of light years , to observe microscopically small particles fm world longitudinally to observe celestial bodies tens of years of evolution , a short moment to s reaction . In addition , there was deepening understanding of substance , to develop new energy, new materials play an important role in a variety of extreme technical studies, such as ultra-high temperature , ultra-low temperature , high pressure , ultra-high vacuum , powerful magnetic field , ultra- weak magnetic field and so on. Obviously, to obtain a large number of human senses can not directly access the information , there is no compatible sensors is impossible. Many barriers to basic scientific research , the first is that there are difficulties to obtain information about the object , and some new mechanism and high-sensitivity detection sensor appears often lead to a breakthrough in the field . Some development of sensors , often it is a pioneer in the development of interdisciplinary . Sensors already penetrated into such as industrial production, space development , ocean exploration , environmental protection, resource surveys , medical diagnostics , biotechnology, and even conservation areas of the pan so extremely . It is no exaggeration to say that from the vast space , to the vastness of the ocean , as well as a variety of complex engineering systems , almost every one modernization project , are inseparable from a variety of sensors. Thus, the sensor technology in economic development , and promote the important role of social progress , it is very obvious . Countries in the world attach great importance to the development of this area . I believe in the near future , there will be a leap in sensor technology , to achieve an important role commensurate with its new level .

Auto industry

Modern limousine electronic level control system is the key to the number of sensors used and the level of an ordinary family car is currently installed on approximately tens to hundreds of sensors only , and luxury cars on the number of sensors can be up to two hundred only , usually more than 30 kinds of species , as many as up to one hundred kinds .1, with the electronically controlled fuel injection jet engine sensor1 ) Intake air pressure sensor : reflecting the intake manifold absolute pressure changes in the size , is the ECU ( engine control unit ) provides injection duration calculation reference signal ; sedans are measured using the pressure sensor . Now widely used in the semiconductor varistor inlet air pressure sensor .2 ) Air flow sensors: measurement of engine intake air quantity supplied to the electronic control unit (ECU) as a reference signal for the fuel injection time ; under different measuring principle , rotor blades can be divided into air flow sensor ( TOYOTA PREVIA Wagon ) , Karman vortex air flow sensor trips ( Toyota Lexus LS400 sedan ) , hot air flow sensor ( hot-film air flow sensor and the four types . former two types of volume flow , mass flow rate of the latter two types present the main using hot air flow sensor and two kinds of hot-film air flow sensor .3 ) Throttle Position Sensor : measuring throttle valve opening angle , off the oil supplied to the ECU as the control of fuel / air ratio , ignition advance angle correction of the reference signal ; It has three types : switch contact type throttle position sensor , linear variable resistive throttle position sensor, throttle position sensor integrated .4 ) crank angle sensor : also called crankshaft position Engine Water Temperature Sensorfor detecting the crankshaft and engine speed , to provide to the ECU for determining the working order of the ignition timing and a reference signal ; There are three types : electromagnetic pulse crankshaft position sensor , Hall -effect crankshaft position Engine Position Sensor, photoelectric effect crankshaft position sensor . Crankshaft position sensor is different, its control method and control accuracy are also different. Crankshaft position sensor generally mounted on the crankshaft pulley or sprocket side , some mounted in front of the camshaft , and some are mounted on the distributor 5 ) oxygen sensor : detects the oxygen concentration in the exhaust gas supplied to the ECU as a control of fuel / air ratio in the optimum value ( theoretical value ) near a reference signal ;6) The intake air temperature Motor Position Sensor : detects intake air temperature , provided to the ECU as a basis to calculate the air density ;7 ) Temperature sensor : detects coolant temperature , engine temperature, provide the information to the ECU ;
8 ) Knock Sensor: mounted in the cylinder test engine specialized deflagration situation, providing a signal to the ECU to adjust ignition timing based .
9 ) the knock sensor : installed in the engine block , ready to monitor engine knock situation . There are currently used in resonant and non- resonant two categories.

Describes several typical automotive sensors

As technology continues to progress , social development, people's lives car will also be an indispensable means of transport. Automotive Sensor is a prerequisite to ensure normal driving , allowing the engine in the best working condition. Vehicle speed , a variety of medium temperature, the engine operating conditions can be converted into electrical signals so lost car controller . In the past, used in automotive Crankshaft Position Sensor on the engine alone , has now been extended to the site , and the lighting body electrical system , in particular including measuring temperature, pressure , flow , position, gas concentration , speed, light intensity , humidity , distance , etc. automotive sensors .