Any sensor that uses magnetic properties and changes in magnetic flux is called a magnetic sensor. There are two common types of magnetic sensors: piezomagnetic sensors and magnetoelectric sensors. The two types of sensors are quite different in terms of operating principle and range of use.
Piezomagnetic sensors
Compared with other sensors, piezomagnetic sensors have the advantages of large output power, strong anti-interference ability, high precision, good linearity, long life, convenient maintenance, and low operating conditions (it can operate for a long time in an environment with dust, water and corrosive gases). Therefore, it is very suitable for heavy industry and chemical industry use, and it is a very promising sensor. Now, this sensor has been successfully used in metallurgy, mining, papermaking, printing, transportation and other industrial sectors, especially in various automation systems to measure the rolling force of the rolling mill, the tension of the steel belt, the quantitative automatic lifting of the winch, the tension of the paper, the automatic weighing of the crane lifting, the weighing of the batching hopper, the cutting force of the metal cutting process and the safety maintenance of the elevator.
Magnetoelectric sensors
Magnetoelectric sensors are mostly used to measure parameters such as velocity, acceleration, displacement, vibration, and torque. A transducer that converts the measured parameters into induced electromotive force is called a magnetoelectric sensor or inductive sensor. Magnetoelectric sensors are based on the induced electromotive force generated by the movement of wires in a magnetic field. According to the law of electromagnetic induction, the induced electromotive force e of a coil with W turns is proportional to the rate of change of the magnetic flux Φ passing through this coil, ie
If the mechanical quantity directly controls the change in the magnetic flux of the interconnected chain of the sensor coil, the sensor can directly convert the speed of the mechanical motion into an electrical signal proportional to it without going through the central conversion element.
When the structure of the sensor is timed, the magnetic inductance intensity and the total length of the coil L are constant, so the induced electromotive force is proportional to the relative velocity of the coil to the magnetic field. Therefore, the magnetoelectric sensor can only be used to determine linear velocity or angular velocity, but because the velocity and displacement (or acceleration) are only one integral (or differential) connection, if an integral circuit is connected to the measurement circuit in the induced electromotive force, then the output electromotive force is directly proportional to the displacement; If a differential circuit is connected to the measurement circuit, the output electromotive force is proportional to the acceleration of the motion. In this way, magnetoelectric sensors can be used to measure the displacement and acceleration of motion in addition to velocity. In addition to the amplitude of the electromotive force, the output of a magnetoelectric sensor can also be used to output the frequency value of the electromotive force, such as the magnetoelectric tachometer is an example.
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Turck Error Factors for Pressure Sensors
When accounting for the total error of the pressure sensor, the error defined below should be applied. In order to determine the degree of error you have selected for a particular error in the pressure sensor, see the standard statement for that sensor in this catalog.
Note: In the use of specific users, some nominal indicators can be reduced or eliminated.
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AC and DC contactor interchangeability
1. The AC contactor can replace the DC contactor in an emergency, and the suction time can not exceed 2 hours (because the heat dissipation of the AC coil is worse than the DC coil, which is determined by their different structures).
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Calibration steps for pressure transmitters – Turck
When calibrating the pressure, we need to zero the current of the transmitter, and then carry out the positive and negative relocation of the zero point according to the requirements, if the pressure transmitter is calibrated for the first time, then we also need to add the measured physical quantity calibration, and the subsequent calibration can be calibrated by manual operation.
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Principle of angular displacement sensors – Turck
The angular displacement sensor is a model of displacement sensor that uses a non-touch patent plan to effectively improve long-term reliability compared to other traditional angular displacement gauges such as synchronous analyzers and potentiometers. Its unique planning does not require the use of slip rings, blades, touch cursors...
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Introduction to TURCK's various sensors
Inductive sensors
Inductive sensors are capable of detecting metal objects in a non-tactile and wear-free manner. To do this, they use high-frequency communication electromagnetic fields to interact with their targets. Their strengths are durability, robustness, high switching frequencies, and long service life. Cause...
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Routine maintenance of pressure sensors – Turck
1. Avoid scum deposited in the conduit and touch the sensor with corrosive or overheated media.
2. When measuring the gas pressure, the pressure valve should be opened at the top of the process pipeline, and the sensor should also be installed in the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process.
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Introduction to the characteristics of Turck's current transformers
The current transformer plays an important role in the electrical, so the requirements for some characteristics of the current transformer are also relatively high, in order to get used to the sensitivity and speed of electrical action.
First, according to the equivalent circuit diagram of the current transformer ...
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Instructions for use of Turck's proximity switches
1) There is a difference between the two-wire system and the three-wire system of the proximity switch, and the three-wire system proximity switch is divided into NPN type and PNP type, and their wiring is different
2) The wiring of the two-wire proximity switch is relatively simple, and the proximity switch can be connected to the power supply after being connected to the load in series.
3) Three-wire proximity switch ...
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Features of Turck's Turck pressure sensors:
Turck's Turck pressure sensors have outstanding machining and heat treatment capabilities and high compressive strength. Affected by the characteristics of small influence of temperature, the correct selection of elastic sensitive components and strain gauge bridges is an important way to improve the strain gauge sensor: 1. The measurement scale has high optical accuracy, and the force measurement ...
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How to determine the cause when there is no signal output for a pressure transmitter – Turck
When the on-site pressure transmitter has no signal output, we first need to identify where the problem is, and do not rush to think that the pressure transmitter is faulty, because in many applications, in addition to the use alone, the excitation transmitter is also used in combination with other equipment or systems, such as various types of sensors, such as several ...
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Displacement sensor parameters – Turck sensors
1. Technical indicators in terms of activation: for an instrument, generally the higher the degree of activity, the better, because the more active, the easier it is to feel the change in acceleration in the surrounding environment, the acceleration changes greatly, and naturally, the change of output voltage also becomes larger accordingly, ...
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Turck's highly efficient IO-Link encoder series
Turck's encoder range has been strategically expanded even further. We can now consider our customers to offer newer and faster encoders with IO-Link interfaces (COM 3, 230.4 kbps).
As part of Turck's product range ...
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Considerations for the selection of inductive sensors
1. Program selection
Before selecting a plan, the given technical indicators should be clarified, such as the scale of the value, the error of the value, the resolution, the repeatability error, the time drift, the temperature drift, the application environment, etc.
2. The selection of core data ...
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The reason why the temperature sensor could not be calibrated – Turck
Temperature is a commonly used measurement parameter. Temperature sensors are used in instruments that measure temperature. To ensure precision and accuracy, all temperature sensors must be calibrated according to known specifications. However, there will be a variety of problems in the daily calibration process.
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Turck's premium product range is extensive
Sensors can be considered to be almost all areas of industrial automation that provide important information, such as bearing, current, flow rate, temperature, spacing, angle and other information into digital and analog signals. As a pioneer in modern sensor technology, Turck offers a wide range of product lines. ...
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Introduction to displacement sensors and their characteristics – Turck
1. Displacement sensor, also known as linear sensor, is a linear device belonging to metal induction, and the function of the sensor is to convert various measured physical quantities into electricity. In the production process, the measurement of displacement is generally divided into two types: measurement standard and mechanical displacement. Transformed by the measured variable ...
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The difference between Turck sensors and actuators
Sensors and actuators keep an eye on different signals, operate in different ways, and must work together to complete the mission. They are also physically located in different areas and are often used in solitary applications.
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Turck's method for commissioning pressure sensors
An example of Turck's debugging method for turck pressure sensors is as follows: Select a 0.08-2MPa planned controller, request the pressure to be reduced to 0.8MPa (down switching value) to announce the contact signal, and the operation process is as follows:
Screw the product into the hydraulic pressure ...
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Working process and detection method of temperature sensor - Turck
A temperature sensor is a functional component that senses temperature and converts the sensed temperature change into an electrical signal. Before we practice the temperature sensor detection and replacement, we must first have a certain understanding of the device orientation, structural characteristics and operating principle of the temperature sensor.
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Turck's pressure sensors are prone to malfunctions
** is the pressure, the transmitter can't lose it. In this case, look at the pressure connector to see if it leaks or is clogged, if it admits not, look at the wiring and see if the power supply is normal, simple pressure to determine if the output has changed, or if there is an output at the zero point of the sensor, ...
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