In order to carry out a detailed measurement operation, it is necessary to first consider the principle of the sensor, which needs to be determined after analyzing many factors. Since, even if the same physical quantity is measured, there are multiple principles of sensors to choose from, which principle of the sensor is more suitable, it is necessary to consider the following detailed questions according to the characteristics of the measurement and the application conditions of the sensor:
the size of the measuring range;
The requirements of the measured orientation on the volume of the sensor;
The measurement method is touch type or right or wrong touch type;
The method of eliciting the signal, wired or right or wrong touch measurement;
The origin of the sensor, domestic is still imported, whether the price is bearable, is still self-developed.
In general, within the linear range of the sensor, the higher the sensitivity of the sensor, the better. Because only when the sensitivity is high, the value of the output signal corresponding to the measured change is relatively large, which is conducive to signal processing. However, it should be noted that the sensitivity of the sensor is high, and the external noise that has nothing to do with the measurement is also easy to mix, and it will also be expanded by the expansion system, which will affect the measurement accuracy. Therefore, the sensor itself should have a high signal-to-noise ratio to minimize the disturbance signal introduced from the outside world.
The sensitivity of the sensor is directional. When the measured quantity is a one-vector quantity and has high requirements for its directionality, the sensor with low sensitivity in other directions should be selected. If the measured is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor, the better.
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Selection criteria for proximity switches
Points to note in the selection of proximity switches
1. The working voltage of the proximity switch output is selected, generally DC type DC24V or AC AC250V optional;
2. Proximity switch output method selection, generally NPN-normally open, NPN-...
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The selection of proximity sensors follows the essentials – the blessing of the United States
For different raw material detection bodies and different detection intervals, different types of proximity sensors should be selected to make them have a high performance-to-price ratio in the system, for which the following principles should be followed in the selection:
1. When the detector body is a metal material: high-frequency oscillation proximity ...
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Common dry contact signals for safety barriers
The dry contact of the barrier is an electrical switch that has two positions: closed and disconnected. There is no polarity between the two contacts of the dry contact and is interchangeable. That is, a simple switch, the contact does not provide power supply, and the power supply can be used to control the condition of the equipment. But it doesn't offer ...
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How to identify the number of pulse positions in an encoder – we are blessed
The pulse encoder is a rotary encoder that uses the rotation pulse for signal output, and the main characteristics are the standard shape and diversified shape structure; The internal coding is stable, the signal output qiang, and the pulse value and positioning value are clear. Therefore, when choosing this type of punching encoder, ...
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A common way to detect the level of liquids – we are blessed
In order to select the best liquid level sensor, we need to understand not only the characteristics and conditions of the liquid to be measured, but also the advantages and limitations of different detection methods, and then we can select the most suitable sensor. Here are some of the most common inspection technologies on the market today.
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Safety barriers are used for intrinsically safe system features
The barrier and barrier are composed of four parts: the input signal processing unit, the barrier unit, the output signal processing unit, and the power supply. Depending on the direction of the signal, a substantial safety plan is added to the input or output unit, which then forms a barrier and a barrier. Traditional barrier and safety ...
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Air pressure sensor principle and precautions
The air pressure sensor is a control sensor that can be operated according to the barometric pressure end sensing. Inside the air pressure sensor, an air intake tube is provided that can promise air ingress, and once the power is applied, air can be transferred to the inside of the sensor, and when air enters, squeeze sensing occurs ...
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The right way to choose a torque sensor – we are blessed
With the gradual growth of demand for torque sensor shopping malls at that time, in recent years, manufacturers and brands producing torque sensors have shown a rapid upward trend.
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Anti-jamming technology for sensors – we are blessed
1. Shielding skills
Containers are made from metal materials. Wrapping circuits that require maintenance between them can effectively prevent the disturbance of electric or magnetic fields, which is called shielding. Shielding can be divided into electrostatic shielding, electromagnetic shielding and low-frequency magnetic shielding.
2. Electrostatic shielding
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There are three types of P+F proximity switches
P+F proximity switches can be divided into three varieties:
1. Capacitive proximity switch can detect metal and non-metal objects with an induction scale of 1-40mm
Capacitive proximity switches detect both metallic and non-metallic objects. ...
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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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The structure of proximity sensor switches – we are blessed
1. Durability
The reason why the switch has such a long life is that the switch acts as elastic from the vertical direction of the elastic membrane. Although millions of peristalsis are carried out after the elastic membrane, because the creep rate is very small, only 0.1 - 0.3m ...
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P+F proximity switch selection
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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Photoelectric sensor sensing mode – Doublebless
The pass-through beam device consists of an acceptor located within the line of sight of the transmitter. In this mode, an object is detected when the beam is blocked from the transmitter to the receiver.
The retroreflective device places the transmitter and receiver in the same direction, and uses the reflector to ...
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How to choose an accelerometer
First, understand the digital output part. When purchasing an accelerometer sensor, you must understand the digital output, because this determines the interface between the system and the acceleration sensor, if the number does not correspond, it is inconvenient to use, so you must understand the data at the time of selection.
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The measurement properties of our sensors
According to the nature of the measurement, sensors can be divided into three categories: physical sensors, chemical sensors and biosensors.
Physical sensors: It is the use of certain physical effects to convert the measured energy into energy that is easy to process.
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The principle of installation of safety barriers
1. The safety barrier should be installed in a safe place, and the environmental conditions should meet the requirements of the "application conditions" in the "Safety Barrier Selection Sample".
2. The connecting wires of the intrinsically safe end (blue end) and non-intrinsically safe end circuits of the barrier safety barrier are in the sink ...
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Introduction to the sensor model
Proximity Switches:
NBB2-12GM50-E2 NBB2-12GM50-E0 NBN4-12GM50-E2
NBN4-12GM50-E0 NBB5-18GM50-E2 NBB5-18GM50-E0
NBN8-18GM50-E2 NBN8-18GM50-E0 NBN15-30GM50-E0
NBN15-3 ...
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The steps of the use of the photoelectric switch
1. Self-conditioning. At the beginning of use, please check whether the switch itself is defective and whether the appearance is defective.
2. When using the EL130 photoelectric switch to avoid obstructions, some goods such as colored goods. Less reflective goods. Goods with large gaps between small pieces ...
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Precautions for the installation of single-point load cells – we are blessed
1. Single-point load cells should be handled with care, especially for small capacity sensors with alloy aluminum as elastomers, any vibration-induced impact or drop is likely to cause large output errors.
2. Design loading ...
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