The resistive sensor and the corresponding measuring circuit are composed of force, pressure, weighing, displacement, acceleration, torque and other measuring instruments are one of the indispensable tools for automatic weighing, process detection and automation of production process in metallurgy, electric power, transportation, petrochemical, commercial, biomedical and national defense departments.
Classification of resistive sensors
According to its operating principle, resistance sensors can be divided into: resistance strain sensors, potentiometer sensors, thermal resistance sensors, semiconductor thermal resistance sensors, etc.
How resistive sensors work
Metal bodies all have a certain resistance, and the resistance value varies depending on the type of metal. The finer or thinner the same material, the greater the resistance value. When an external force is added, if the metal becomes thinner and longer, the resistance increases; If it becomes thicker and shorter, the resistance decreases. If a metal resistor is installed on the object where the strain occurs, when the object is elastic, the metal body also becomes elastic in a certain proportion, so the resistance value changes accordingly.
Ordinary resistance sensors are developed in the direction of high precision, convenient and fast use, and labor-saving. The resistance sensor is a sensitive element that directly converts the strain signal into an electrical signal, so it is suitable for making various sensors, and the resistance sensor is mainly used for measuring force, pressure, acceleration, displacement, torque, etc.
In the past, resistance sensors were mainly used for experimental research operations, and were often used for industrial inspection and weighing, measurement and control of production lines. There has also been an increase in applications such as medicine and bioengineering. In the application process, the sensor is generally required to have the characteristics of stable electrical signal output, fast response speed, small size, light weight, etc., and the resistance sensor can meet such conditions. However, resistance sensors still have shortcomings in various functions such as temperature, creep, hysteresis, and elastic modulus self-compensation. However, with the advent of excellent phenolic glue, epoxy phenolic glue and polyphthaleimide glue and other materials, the resistance sensor with better performance will have a better prospect.
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Classification of the movement mode of the displacement sensor
The displacement sensor has no sliding contacts, is not affected by non-metallic elements such as dust during operation, has low power consumption, and has a long service life, so it can be used in various bad conditions. Displacement sensors are mainly used to intelligently control the analog quantity of automation equipment production lines.
The displacement sensor selects laser three...
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Material classification for displacement sensors – a blessing
(1) Conductive plastic displacement sensor
Conductive plastic displacement sensor uses a special process to coat the DAP (didipropylphthalate) resistance paste on the insulating body, heat and polymerize to form a resistive film, or press the DAP resistive powder thermoplastic into the groove of the insulating matrix to form a solid body as a resistor.
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Solutions for ultrasonic sensor applications
In industrial use, ultrasonic sensors are characterized by high reliability and versatility. Since the ultrasonic sensor measurement method works reliably in almost all environmental conditions, even the most complex tasks can be used for a secure connection for object detection or level measurement.
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The number and range of load cells – we are blessed
Resistive strain gauges, elastomers, and detection circuits are the first and foremost parts of the equation. An elastomer is a special shaped structure. It has two functions, firstly, it bears the load of the force on the cell and the external force, to achieve a relatively static equilibrium, and secondly, it ...
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The reason why analogue sensors are interfered with – we are blessed
1. The PCB layout board touches the problem, and when the imitation signal is routed, the imitation signal is not wrapped with imitation, and it is even possible that the signal line and then directly go to the power line, which is easy to receive disturbances.
Solution: When it is a board, wrap the GND to imitate the signal line. If there is a model ...
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The proximity switch determines the key points of the model
1. Select the type of proximity switch according to the detected object. If the detection object is metal, the inductive proximity switch is preferred, and if the detection object is non-metal such as wood, plastic, paper, water, etc., or smaller and finer metals, the capacitive proximity switch should be selected.
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The main classification of encoders – Beggarb
Encoders can be classified as follows.
1. Classification according to the engraving method of the code disc
(1) Incremental type: that is, every time the viewpoint of the unit is rotated, a pulse signal is announced (there is also a sine and cosine signal, and then it is ...
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Installation and assembly of ultrasonic sensors
Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs), where ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be taken into account when installing and assembling ultrasonic sensors?
Ultrasonic ...
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Pre-selection of sensors
In the early application and selection of sensors, how to choose is a very important point, and the selection is smooth, and the following will briefly talk about how the sensor is selected in the early stage.
The use of the sensor in practical operation is relatively common and may be practical ...
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Common faults of displacement sensors – we are blessed
The working principle of the straight line is the same as that of the sliding rheostat, it is used as a voltage divider, it is the actual orientation of the measured direction with the relative output voltage. There are the following requirements for the operation of this equipment:
1 ...
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Auxiliary mechanical device installation method - double blessing
Auxiliary mechanical devices: commonly used are rack and pinion, chain belt, friction runner, rope reeling machinery, etc.
Low-speed end device: installed behind the reduction gear, such as the shaft end of the winch wire rope drum or the shaft end of the next reduction gear ...
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The choice of accelerometers – Beggar
1. Analog output or digital output:
The first thing to pay attention to is the case of the analog and digital outputs, which is important because it is the interface between the system and the sensor. In general, the voltage of the analog output is proportional to the acceleration. For digital outputs, pulse-width modulated signals are typically used ...
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Doujiafu helps intelligent robots to fight against the war
Now that the prevention and control of the new pneumonia epidemic has entered a critical period, how can it be useful to reduce cross-infection in hospitals and prevent the spread of the epidemic? Reduce the operational pressure of front-line medical personnel and help prevent and control the epidemic? All of them have become the key policies that have attracted wide attention. From long-distance medical care to intelligent robots ...
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Benefits of our industrial sensors
The R2 and R3 series of photoelectric sensors are impressive products that characterize a very small housing plan. Robust R2/R3 miniature photoelectric sensors – smaller than a matchbox, space-saving miniature housing photoelectric sensors R2/R3 series ...
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The key factor influencing sensor performance – the company
Because the metal material is used as the elastomer of the load cell load cell, when the fine particles between the external force and the micro-strain disappear, the micro-strain disappears, but whether it can be fully recovered to the original non-stress state will be changed according to the metal data of the elastomer.
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Analysis of the causes of repairs encountered in encoders – Doublebless
1. Encoder self-failure: It refers to the failure of the encoder's own components, resulting in its inability to generate and output correct waveforms. In this case, the encoder needs to be replaced or the internal equipment repaired.
2. The encoder connection cable is faulty ...
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What are the types of displacement sensors – Doublebless
1. The displacement sensor is a device that converts the motion displacement of the object into measurable electrical quantities. It is usually used to convert physical quantities such as displacement, orientation, deformation, oscillation, and size that are not convenient for quantitative detection and processing into electrical quantities that are easy to quantitatively detect and facilitate information transmission and processing.
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Classification of pressure sensors
There are great differences in the skills, design, function and adaptability of pressure sensors, as well as the conditions and price of pressure sensors. According to preliminary estimates, there are more than 60 types of pressure sensors in the world and at least 300 companies produce pressure sensors.
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Precautions for P+F safety barriers
First, it is necessary to pay attention to the capacitive and inductive resistance of cables and field equipment, explosion-proof is the explosion-proof system, in addition to the need for P+F safety barriers to reach the required explosion-proof level, the energy storage of cables and field equipment is also a key issue. Especially after parametric certification replaces system certification, engineering companies are especially ...
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The role and classification of safety barriers
In electrical intrinsic safety explosion-proof, we generally divide the workplace into explosion-proof areas and non-explosion-proof areas. There is the transmission of electrical energy between the explosion-proof area and the non-explosion-proof area, for example, the switches, buttons, sensors, etc. in the explosion-proof area are connected to the PLC placed in the electrical cabinet in the non-explosion-proof area through wires.
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