Sensor misconceptions

Although the development of sensors is already warming step by step, but almost all-pervasive sensor applications, for how many people are buying the sensor and worry about, I do not know how to choose, today, this article does is to take you out to the sensor error understanding. For Crank Shaft Position Sensor selection, our primary concern is its application environment and the actual demand. Environmental conditions such as test, the measured object volume requirements. In addition, the output signal, whether the cable transmission, measurement of contact, are needed before we select Crank Angle Sensor understand the factors in advance. Only if we know their application needs, go to apply the sensor performance attributes, will let us have a more clear and detailed range of options, more targeted reference direction. Understanding of the sensor after the application environment and the actual demand, it is necessary to see the detailed parameters of the sensor. The two most important parameters of the sensor is the accuracy and sensitivity, some users of these two parameters have a great misunderstanding

Electrochemical gas sensors

Electrochemical gas sensor is the use of the electrochemical activity of the sample gas, the electrochemical oxidation or reduction, and thus to distinguish gas composition, gas concentration detection. The more common types of primary batteries electrochemical sensor type (it works similar to a fuel cell), the constant potential electrolysis cell type (mandatory role in the current work, is a coulometric type sensors) and so on. Currently, the electrochemicalEngine Temperature Sensors to detect toxic and harmful gases the most common and most mature of the sensor. It features small size, low power consumption, good linearity and repeatability, resolution can generally achieve 0.1ppm, longer life expectancy. Deficiency is susceptible to interference, sensitivity influenced by temperature changes. Honeywell's technology companies produced British cities for the detection of H 2 S 3HH electrochemical sensors, the measurement range 0 ~ 50ppm, the maximum allowable value 500ppm, a resolution of 0.1ppm, dimensions about OD 42mmX high 18mm, its main source of cross-interference with CO, SO2, NO, NO2, H2, etc. Zirconia oxygen sensors are electrochemicalMotor Position Sensor component analysis as a relatively late development, began to appear in the 1960s, and its working groups rationale is based on the principle of concentration cell by measuring the gas to be analyzed and the reference gas oxygen concentration due to the concentration differences resulting force, to measure the oxygen content of the gas to be analyzed. Because of its simple structure, reliable operation, high sensitivity, good stability, fast response, easy installation, etc., it developed rapidly. Often used in sulfuric acid, air separation, boiler combustion analysis of multi-component gas of oxygen and oxygen-containing molten metal determination and so on.

Thermal gas sensor

Thermal gas sensor are mainly thermal conductivity and thermal chemical formula of two categories. Thermal conductivity is the use of the thermal conductivity of the gas , through which the change in resistance of thermistor to measure the concentration of one or several gas components , and its application in the industry for several decades already , the type of meter more, to analyze gases are more widely used ( such as H2, CO2, SO2, NH3, Ar , etc. ) . Thermal chemical formula is based on the gas being analyzed chemical reaction heat effect , which widely used is gas, the oxidation reaction ( i.e. combustion ) , typically a catalytic combustion type gas Motor Position Sensor, the key member is coated with a combustion catalyst Wheatstone bridge , the main for the detection of combustible gases, such as gas stations, gas plant is used to analyze the air CO, H2, C2H2 and other combustible gases , coal mine used to analyze the content of CH4 in the trenches , oil exploration vessels leak methane content of the scene , fuel and chemical raw materials storage warehouse or workshop materials analysis of oil vapor in the air , such as alcohol, ether vapor . U.S. RAE Systems produced FGM-3100 catalytic combustion of combustible gas detector , the sampling method is diffused , the detection accuracy of ± 2% of full scale , response time <15s. Catalytic combustion type gas Engine Coolant Temperature SensorThe main advantage is that the response of all combustible gases broad spectrum, the ambient temperature , humidity insensitive to near-linear output signal , and its simple structure and low cost. But its main deficiency is low accuracy , high working temperature ( internal temperature up to 700 ~ 800 ℃), current consumption large , vulnerable sulfide, halogen compounds such as poisoning and other adverse effects .

Principle and Application of Gas Sensors

The so-called gas sensor is used to detect whether a certain area in the presence of a specific gas and / or capable of continuous measurement of gas component concentration of the instrument. In the coal mine , petroleum, chemical , municipal , medical , transportation , family and other security aspects , commonly used in the detection of combustible gas Crankshaft Position Sensor Replacement, combustible , toxic gases or existence , or oxygen consumption and so on. In the electric power industry and other manufacturing fields, but also quantitative measurement of flue gas sensor used in the concentration of each component to determine the combustion of harmful gas emissions and the like. Field of environmental monitoring in the atmosphere , the use of gas sensors determine environmental pollution situation , it is very common.

Classification of the gas sensor

Classification of gas sensors from detecting the type of gas , the often divided into combustible gas sensor ( often using catalytic combustion , infrared, thermal conductivity , semiconductor type ) , toxic gas sensors ( generally using electrochemical , metal-semiconductor , photoionization , flame ionization type ), hazardous gas sensor ( often with infrared , ultraviolet , etc. ) , oxygen ( often using paramagnetic , zirconia ) and other type of Crankshaft Sensor; from the use of the instrument , into the portable and stationary ; obtained from the gas the way the sample is divided into diffuse ( i.e. sensor mounted directly on the object to be measured environment , the measured gas through natural diffusion in direct contact with Engine Position Sensorelement ) , suction ( suction pump is through the use of other means , to be tested gas is introduced into the sensor sensing element detection. based on the measured gas is diluted , can be subdivided into full suction and dilution type, etc. ) ; from the analysis of gaseous components , and is divided into a single formula ( only for specific gas detection ) and compound of formula ( composition for simultaneous detection of multiple gases ) ; press Sensor detection principle , be divided into thermal , electrochemical , magnetic , optical , semiconductor type , such as gas chromatography type .

Non- contact temperature sensor

It can be used to measure the movement of objects , a small thermal capacity , a very rapid temperature change or a small target temperature of the surface of the object , but also can be used to measure the temperature distribution of the temperature inside . Measured object is saying there is no contact between the sensing element , so it also called non- contact Thermometer . Now the most frequently used non- contact thermometer is based on the basic law of blackbody radiation work , known as the radiation thermometer tables. Radiation thermometry method has the following categories: colorimetric , radiation and brightness of the Act . The above method can only measure the temperature of the corresponding colorimetric , photometric radiation temperature and temperature . However, only about blackbody temperature measurement is the real temperatureNon-contact Engine Temperature Sensors for measuring temperature main advantages : For temperatures above 1800 ℃ , generally using a non- contact temperature measurement method ; its measurement limit is not affected by temperature sensing element temperature limits the degree of Therefore the highest temperature for the measurement , in principle, is not also limited ; infrared technology is now becoming more and more well, and the radiation temperature gradually from the visible to the infrared to expand , until room temperature is lower than 700 ℃ of which can be measured , and and its resolution is very high.

Contact temperature sensor

As part of this sensor detects between the measured object with a good contact, so again it is usually called a thermometer. It is by conduction or convection and thermal equilibrium state , it can be directly displayed value represents the case of the measured temperature of the object . Generally, it 's measurement accuracy is relatively high . Within a Crankshaft Sensor Replacement certain temperature , it is even able to measure the temperature inside the object of each case . However, if the measurement is the movement of objects , the heat capacity of small objects or Crank Shaft Position Sensor small target, the measurement results will have a relatively large errors , frequent use of the thermometer with pressure thermometer , resistance thermometers , bimetal thermometers and glass liquid thermometers, etc. and so on. They are in the commercial, agricultural and industrial applications are very wide , even in normal life , people often use these thermometers. In electronics, medicine, metallurgy , defense engineering and food sectors , cryogenic technology is widely applied , and there are strong research on superconducting technology , and now you want to measure the temperature of the low temperature below 120K thermometer has been well development , such as : acoustic thermometer, temperature heat thermometer , vapor pressure thermometer, gas thermometer and temperature and so on. Low temperature thermometer element to smaller size , better stability and reproducibility and accuracy is higher. Carburizing heat resistive glass using a porous sintered high-silica glass to form a low temperature carburization thermometer in one temperature sensing element , which can be used to measure 1.6 ~ 300K temperature within this temperature range .