Structure of a resistive sensor
The structure of a resistive sensor consists of two basic parts: a resistive element and a brush (movable contact). The motion of the brushes in relation to the resistive element can be linear, rotational, and spiral, thus converting the linear or angular displacement into a resistive or voltage output that is a definite function of it. The following is the structure and information of the potentiometer:
1. Resistance wires: constantan wires, platinum-iridium alloys and Kama wires, etc
2. Electric brushes: silver, platinum iridium, platinum rhodium and other metals are commonly used
3. Skeleton: Commonly used materials are ceramics, phenolic resins, cloth bakelite and other insulating materials, and the structure of the skeleton is many and often rectangular.
Advantages and disadvantages of resistive sensors
Strengths of resistive sensors
1. There is a large nonlinearity and the output signal is weak, but a certain compensation method can be taken. Therefore, it is widely used in automated test and control technology.
2. The resistance strain gauge in the resistance strain sensor has the strain effect of metal, that is, the mechanical deformation is produced under the action of external force, so that the resistance value changes accordingly
Disadvantages of resistive sensors
1. There is a large nonlinearity about the large strain, but the output signal is weak.
2. With the change of time and environment, the data and equipment functions that make up the sensor will change. Therefore, it is not suitable for long-term monitoring, because the time drift and temperature drift are large, and the real and effective data may not be obtained for long-term measurement.
3. It is susceptible to the influence of electric field, magnetic field, vibration, radiation, air pressure, sound pressure, air flow, etc.
The force measurement, pressure measurement, weighing, displacement, acceleration, torque and other measurement appearances composed of resistive sensors and corresponding measurement circuits are one of the indispensable things for metallurgy, electric power, transportation, petrochemical, commercial, biomedical and national defense departments to carry out automatic weighing, process detection and complete the automation of the production process.
|
More on that
|
Precision pressure sensors with additional temperature monitoring in ifm
ifm precision pressure sensors with additional temperature monitoring output via IO-Link and 2 switching channels for continuous transmission of process values and advanced diagnostic information in a housing width of only 19 mm
● 2 solutions: ...
|
|
Signal discrimination method generated by vibration sensors – ifm
1. Distinguish according to the gap voltage
The oscillation sensor outputs a voltage signal that contains both DC and AC. The amount of DC corresponds to the uniform distance between the sensor and the probe, also known as the void voltage. The traffic corresponds to the oscillating signal. If the void voltage is normal, the alternating current is usually normal.
...
|
|
Choice of load cell construction form – ifm
First, the application environment of the weighing system
Sensors operating in high-temperature environments should use high-temperature resistant sensors, and especially harsh occasions must also be equipped with heat-insulation, water-cooled or air-cooled devices.
For use in alpine areas, load cells with heating devices should be considered.
...
|
|
Failure analysis of the ifm pressure sensor PN2071
1. ifm sensor PN2071 pressure up, sensor output can not go up in this case, first should check whether the pressure interface is leaking or blocked, if you admit that it is not, check the wiring method and check the power supply, if the power supply is normal, then simply pressurize to see if the output changes, maybe observe ...
|
|
Notes on Linear Position Sensors – ifm
1. If the electronic ruler has been used for a long time, and the seal is now aging, it is mixed with a lot of impurities, and the water mixture and oil will seriously affect the contact resistance of the brush, which will make the displayed numbers constantly beat. At this time it can be said that the electronics of the linear displacement sensor ...
|
|
Basic parameters of load cells – ifm
A load cell (also known as a load cell) is a type of sensor that converts a physical force signal into an electronic signal. From the basic principle, it is divided into strain type, piezoresistive type, piezoresistive type, foot type, etc.
Non-repeatability: In the same ring ...
|
|
High-frequency pressure sensor output signal – ifm
The conversion of the pressure to the electrical signal is done by the physical deformation of the strain gauge, and the strain gauge is bonded to the diaphragm of the pressure sensor and wired into a Wheatstone bridge structure. The pressure exerted on a high-frequency pressure sensor causes the diaphragm to flex, which causes the strain gauge to strain. Strain will occur ...
|
|
How to use load cells and amplifiers – ifm
1. Wiring according to wiring requirements
2. Connect the specified size DC power supply to the transmitter.
3. Connect the sensor and adjust it to the corresponding zero output value (the corresponding zero output value (e.g. 0-10V output.
...
|
|
The main functions of IFM ifm proximity switches
2.1 Inspection interval
Detect the stop, start and orientation of elevators and lifting equipment; Detect the orientation of the vehicle to avoid collision between two objects; Detect the setting orientation of the operating machinery and the limit orientation of the moving machine or components; Detect the abort azimuth of the rotary body, the opening or closing of the valve; Detection of cylinders or hydraulic ...
|
|
Classification of ifm magnetic sensors
Any sensor made by using magnetic properties and magnetic flux changes 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.
...
|
|
Pressure sensor encounters fault handling method – ifm
Don't panic when you encounter a problem with the pressure sensor, you should find a way to solve it, if the pressure rises, the transmitter output will not rise.
In this case, first look at the pressure sensor pressure interface to see if it is leaking or blocked; If not, check the connection form and power supply; If...
|
|
Presentation of flow sensors for detecting gases – ifm
Gas flow sensors can display the cumulative flow, instantaneous flow, temperature and pressure of gases, and it is widely used in all walks of life, such as industrial production, scientific experiments, power saving, etc., and plays a role in promoting the production power of progressive society.
...
|
|
Precautions for sensor installation – ifm
Temperature sensor
1. The sensor should be firmly grounded, and the wire side of the sensor should not be short-circuited.
2. The thermistor of the moving magnet water thermometer sensor will increase with the temperature and the resistance value will decrease.
Fuel level sensor
...
|
|
The reason why the load cell has no signal – ifm
When using load cells to detect the distance of objects, many users encounter the problem that the load cell does not output a signal after detecting an object, resulting in the inability to perform subsequent data analysis. But the reason is not always like that, the load cell does not lose after detecting the object.
|
|
Precautions for the installation of ultrasonic level gauges
1. The appearance is installed outdoors, and it is recommended to install a sunshade to prolong the service life of the appearance.
2. Wire and cable protection pipes should be sealed to avoid water accumulation.
3. Although the appearance itself is equipped with lightning protection equipment, when the appearance is used in the multi-lightning area, it is advocated to distinguish the inlet and outlet lines on the surface.
|
|
ifm is particularly used for capacitive sensors in the plastics industry
Model M30 · Non-flush installation · M12 connector · 3 lines
KI5082 - Capacitive sensor, M30 x 1,5, Teach teach-in, Electronic lock, Auto-detect PNP/NPN , DC PNP/NPN, Sensing distance 20 mm, Non-flush mounting, IP 65 / IP 67, Ring ...
|
|
Introducing the ifm all-metal inductive sensors
Changes in mechanical spacing can be detected directly and parameterized easily via the IO-Link interface
Interval measurement provides robust endpoint position detection
High quality stainless steel housing (316L)
The temperature scale is the most ...
|
|
The solution to the non-output of pressure transmitters – ifm
1. If the pressure transmitter is used in cooperation with the digital display, if the digital display does not appear at this time, then the user may say that the pressure transmitter has no output, but in fact, this problem is obvious, and it is unreasonable to hastily determine that the pressure transmitter has no output. If the pressure transmitter is working properly, ...
|
|
ifm IO-Link devices are the inputs and outputs of the master modules
The new IO-Link I/O modules make it easy and cost-effective to add robust digital inputs and outputs to ifm's IO-Link master modules for use in the field.
●After IO-Link and binary signal ...
|
|
Advantages of ifm RFID solutions:
ifm has the widest range of IO-Link sensors on the market. The new RFID antenna further completes the original product variety. The RFID antenna is planned to connect to the IO-Link master. The master* can supply up to 8 M12 sockets for easy connection to IO-Link RFID antennas. IO-Link Master ...
|
|
Contact
working hours
