Sources of gas sensor performance requirements

Gas sensors are used to detect the ambient atmosphere ( volume concentration ) and thus are often exposed to the environment, the use of various components , which are sometimes very harsh working conditions ( plus high temperature, humidity , etc. ) , sensitive materials will deteriorate over time , deteriorate the material surface adsorbate persist, its performance will decline . Thus requiring Shaft Position Sensor able to work under harsh environmental conditions . Then the performance of the conditions need to be met : 1, can selectively detect a single gas , while the other gases coexist is not responding or not sensitive ; 2 , the measured gas has a high sensitivity to detect the volume concentration ranges specified the gas ; 3, the signal fast response, good reproducibility ; 4 , long-term job stability ; 5 , the manufacturing cost and the use of lower priced universal ; six easy maintenance.So far fully meet the above requirements of Crankshaft Positioning Sensor is also difficult to achieve, but people are trying to take advantage of micro- computer technology as well as a combination of several gas sensors and pre- processing means perfect combination of gas sensor performance.

Load cell specific classification

In fact, the classification of the load cell is a lot of ways for each application and production technology are not the same, what is the load cell specific classification . Photoelectric sensors include two kinds of grating and the code disc . Grating Car Sensors  moire grating formed into the angular displacement of the optical signal. Two gratings , one for the fixed grating and the other is mounted on the shaft dial movement grating. Added to the load-bearing stage analyte through force transmission lever system so that the dial shaft rotation , led moving grating rotation, so that it moves with moire . Using photoelectric conversion circuit, and tables , can calculate the number of moves over the moire , measuring the rotation angle of the size of the grating , so as to determine and read out the measured physical quantity . Code disc Cooling Temperature Sensor code disk ( sign board ) is mounted on a shaft of transparent glass dial , above a certain coding method with the scheduled black and white code. Added to the load-bearing platform of the test object by the force transmission lever dial shaft is rotated, the code plate is rotated along with a certain angle . Photocell for receiving light through the code wheel and converted into an electrical signal , and the digital processing circuit , and finally displayed on the monitor represents the measured quality digital . Photoelectric sensors have been mainly used in the mechanical and electrical integration scales . Hydraulic gravity Car Temperature Sensor P-action by the measured object , the hydraulic pressure of the oil increases, the increase is proportional to the degree of P . Increasing pressure measured value , you can determine the quality of the measured object . Hydraulic pressure sensor structure is simple and strong , wide measurement range , but the accuracy is generally not more than 1 /100. Electromagnetic force sensor
It utilizes the load bearing platform with electromagnetic force equilibrium principle. When the load measured object placed on stage , the upwardly inclined end of the lever ; photovoltaic element detected inclination signal is amplified and flows into the coil , electromagnetic force , the lever returns to equilibrium. Counterweight against the currents generate electromagnetic digitizer , you can determine the quality of the measured object . Electromagnetic force Crankshaft Positioning Sensor accuracy, up to 1/ 2000 to 1/ 60000 , but only in the range of tens of milligrams weighing 10 kg. Capacitive sensor which utilizes frequency oscillation circuit capacitor and the electrode distance d, f proportional relations . There are two plates , one fixed and the other one movable . Loading the loading station when the measured object , the leaf spring deflection , the distance between the two plates changes, the oscillation frequency of the circuit also changes . The measured change in frequency measured can be calculated the mass of the load stage . Capacitive sensors less power consumption , low cost , accuracy of 1/200 to 1/ 500 . Variable magnetic Crankshaft Sensor Replacement ferromagnetic element in the form of analyte mechanical deformation under the action of gravity , the internal stress and cause changes in permeability , so that around the ferromagnetic element ( pole ) of the secondary side also changes the induced voltage . The change in the measured voltage can be calculated the force applied to the pole , and to determine the quality of the measured object . Pole change form sensor accuracy is not high , usually 1 /100, applicable to large -tonnage weighing , weighing range of tens to tens of thousands of kilograms .

Three types of temperature sensor probe

Temperature sensors are in contact and non-contact type two, which is the Sensor Camshaft probe is an important part of it is directly related to the temperature measurement accuracy and stability. Typically, Camshaft Position Sensor probe can be divided into three main types . 1 , piercing ( immersion ) probe . These probes are used to measure the temperature of liquids and solids , the probe needle tip is designed to pierce . In use, if the temperature of the probe than the actual measured temperature of the object is low, there is the principle of conservation of energy , heat conduction from the probe at the measured object ; than the actual temperature of the probe if the measured object temperature , then heat the conduction from the probe to the object to be measured above . In this case, the object under test is heated up , the measured temperature is the temperature of the object after heating . In this case it is necessary to consider the ratio of the probe and the medium , because the ratio of the probe and the medium is better , more precise object to obtain a measured energy , reduce the measurement error caused . We must be clear instruments to measure the temperature value is not the medium temperature , but the temperatureofAutomotive Temperature Sensors . The main methods of reducing measurement error are: ensuring piercing or immersion depth of the probe diameter 10-15 times ; when the sample medium is liquid, to try to make it in a static state . 2, the air temperature probe . This probe is mainly used for air temperature measurement, such as refrigerator , freezer , air conditioning rooms, airy spaces , etc. , the probe exposed to the air, so it is easily affected by airflow disturbances , the best solution is for the two airflow -3m / s , the downstream probe is moved above the light , the temperature reached equilibrium and stability. 3 , the surface of the probe . This probe is mainly used for measurement of the surface temperature . When using the probe tip may be measured perpendicular to the object , and close contact with the object under test . Must be noted that the probe and the measured object contact surfaces must be smooth , otherwise easily lead to measurement errors.

Detecting a pressure sensor with a multimeter can only perform simple testing, test results are for reference

Detecting a pressure sensor with a multimeter can only perform simple testing, test results are for reference only. Can be roughly three tests , the detection bridge , the main circuit is correctly detecting sensor is generally full Wheatstone bridge circuit , using the multimeter ohm , the impedance between the input terminal and an output terminal of the impedance , these two impedances is the pressure sensor input and output impedance.If the impedance is infinite , the bridge is broken , indicating sensor is defective or does not determine the correct pin definitions . Zero detection, voltage profile with a multimeter , test without applying pressure conditions, Camshaft Position Sensor zero output .This output is generally mV voltage level , if you exceed the technical specifications of the sensor , it shows zero deviation of range sensor . Pressure testing, inspection alone is: To power the sensor , pressure sensor mouth blown guide holes , files with a multimeter voltage detection sensor output voltage change. If the relative sensitivity of Car Temperature Sensor is large, this change will be significantly . If you did not change , we need to exert pressure switch pressure source .By the above method, a pressure sensor which can detect the approximate position . If the need for accurate detection , it is necessary to use a standard pressure source , the pressure to Cooling Temperature Sensor , and in accordance with the magnitude of pressure variation of the output signal , to calibrate the sensor . And when conditions permit , the relevant parameters of temperature sensing. In short, the pressure detection sensor is a complex task for general detection of a multimeter , can be applied in many cases , but if the required pressure sensors have stringent conditions with the detection of the system .

A compound of the ultrasonic sensor is flexibly vibrators fixed to the base

The ultrasonic sensor is a composite vibrator be flexibly fixed on the base . The compound of the resonator and the vibrator consists of a metal plate and a piezoelectric ceramic bimorph element consisting of a combination of the vibrator . Resonator flared aims to effectively radiate ultrasonic waves generated due to vibration , and the ultrasonic waves can be effectively central portion of the vibrator .Piezoelectric ceramic ultrasonic Camshaft Position Sensor uses a point to note is that in the high- frequency probe , you must use the vertical thickness vibration mode piezoelectric ceramic . In this case , the acoustic impedance of piezoelectric ceramic matches with the air becomes very important . Because the acoustic impedance of the piezoelectric ceramic 105 acoustic impedance of air , which will cause the vibration of the piezoelectric ceramic significant loss of radiation on the surface , then you will need to adhere to a special material on the piezoelectric ceramic ultrasonic Automotive Temperature Sensors , as acoustic matching layer , the air can be realized with acoustic impedance matched , so as to achieve the purpose of the measurement .

Ultrasonic sensors are developed from the use of ultrasonic sensor characteristics

Ultrasonic sensors are developed from the use of ultrasonic sensor characteristics , because of its reliable, easy to install, waterproof , launch angle is small, high sensitivity , are widely used in liquid level monitoring, robot collision avoidance , a variety of ultrasonic proximity switches, and burglar alarm and other related fields. As we all know , is the production of piezoelectric ceramic ultrasonic Cooling Temperature Sensor probes commonly used materials . Here's a look at piezoelectric ceramic ultrasonic Car Sensorsworking principle and structural characteristics .When a voltage is applied to the piezoelectric ceramics , piezoelectric ceramics will change with voltage and frequency mechanical deformation . On the other hand , when the vibration of piezoelectric ceramics , an electrical charge is generated . Using this principle , when given by the two piezoelectric ceramic or a piezoelectric ceramic and a metal sheet having a vibrator, the bimorph element , applying an electrical signal , it will emit an ultrasonic vibration by bending . In contrast, when applied to the bimorph element ultrasonic vibration , it will generate an electrical signal. Because of these effects , it can be used as a piezoelectric ceramic ultrasonic sensor .

How to choose a tension sensor housing material

We all know that there are a lot of tension in the sensor characteristics, although a variety of tension sensor measuring principle the same but the application environment is different , in fact, there is also a tension sensor housing a variety of materials , generally used in metal material, the material can be used most of the aluminum alloy , alloy steel materials and stainless steel.Aluminum alloy tension sensor selection is not a lot , this can reduce costs, but the quality will be relatively light . Are generally small scale will choose aluminum alloy, or a requirement to install will choose this material . Stainless steel and aluminum alloy tension Cooling Temperature Sensor is just the opposite , stainless steel is generally used for a large range of force sensor, the sensor so as to ensure no distortion when driving is not damaged. The general quality of the material Shaft Position Sensor is relatively large , the price is also more expensive in general a large range and some high requirements on the use of this material , alloy steel tension sensor is the most common kind of material . In view of this material between aluminum alloy and stainless steel , alloy steel tension sensor can fit most situations apply . Most are available in the market Engine Water Temperature Sensor alloy . Alloy both stiffness and deformation recovery to ensure consistent deformation , corrosion resistance and good weatherability .We choose the force sensor , when in fact it is not too concerned about the material , because the manufacturers in the production time will take into account what kind of material selection , not large range also selected aluminum alloy tension sensor , unless customers have special requirements , the particular bad environment must choose a material of the sensor. Manufacturers generally also be customized according to customer requirements .