Load cells are an important category of load cells, the most widely used, and there are many ways to do so. In general, the composition of load cells is mainly elastomers, strain gauges, seals, etc. Several of them interact with each other to affect the function of the sensor, and their respective roles are as follows:
The metal material used as the load cell elastomer, due to its complex internal structure connection, when subjected to external force, micro-strain will occur between fine grains, and after the external force disappears, the micro-strain will disappear, but whether it can be completely restored to the original state without force varies depending on the metal material of the elastomer.
If the curves of the loading force and the curves of the unloading force do not coincide, the greater the difference, the greater the hysteresis. The difference mainly comes from the stability and uniformity of the material's own composition, the radial structure after heat treatment, and so on. Knowing the cause of hysteresis, we can reduce the occurrence of hysteresis by selecting the right metal material and using advanced heat treatment methods to improve the elastic limit. At present, the elastomer material commonly used in the domestic market is 40CrNiMoA, which can achieve good inductive mechanical function after reasonable heat treatment process.
The strain gauge of the load cell is mainly composed of a sensitive grid, a substrate, a cladding and a lead. It is the resistance strain effect of the sensitive gate, which converts the strain of the elastomer into a change in resistance, and if there is hysteresis in the material itself, the strain gauge also has hysteresis.
At present, the world's famous strain gauge manufacturers are making strain gauges, taking into account the hysteresis, and using self-compensating measures to reduce the hysteresis to the lowest level. This is also an important factor to consider when selecting a load cell.
After the elastomer and strain gauge are composed, the sensor needs to be sealed with sealant, first of all, to fix the circuit and seal to prevent the external environment from affecting the function of the sensor.
On the surface, the sealant is relatively soft after curing, and the strength relative to the elastomer is negligible. If it is used for small-scale force measurement, this role needs to be considered. When a small force is applied to the elastomer, the deformation of the elastomer is very small, and the thickness of the sealant affects the deformation that occurs.
When designing a good load cell, it is necessary to fully take into account the hysteresis function of the product, and after the above analysis, combined with the specific situation, the magnitude of hysteresis can be significantly reduced.
|
More on that
|
Guangzhou Industrial Automation Technology and Equipment Exhibition ended successfully
The Guangzhou International Industrial Automation Technology and Equipment Exhibition (SIAF) has successfully concluded on March 12, and the number of exhibitors has reached a record high, and we have also felt the enthusiasm of visitors for ifm's booth and products.
...
|
|
Common faults in eddy-current sensors – ifm
The eddy-current displacement sensor is a commonly used measuring instrument, which can accurately measure the static and dynamic relative displacement changes between the measured body (if necessary, a metal conductor) and the end face of the probe, and has the advantages of flexible use, stable function, high reliability and simple protection.
...
|
|
Sensor selection method – ifm
Modern sensors are very different in principle and structure, how to reasonably select sensors according to the detailed measurement intention, measurement objectives and measurement environment, is the first problem to deal with when carrying out a certain quantity measurement.
When the sensor is confirmed, the corresponding measurement method ...
|
|
The ifm identification system has an RFID antenna with IO-Link
Sensitive parameterization, diagnostics and data processing of ifm sensors are suitable for many different uses9 versions, suitable for a variety of different types of sensitive parameterization, diagnostics and data processing with I/O-Link Ideal for the identification of small data volumes with LR DEVICE or IO-L ...
|
|
Precautions for the use of sensors and installation requirements - ifm
Precautions for using sensors:
1) The sensor should not be installed in the following places: direct sunlight, high temperature, frost, and corrosive gas.
2) Do not use the same wiring pipe or wiring groove as the power line and power line to connect the wire.
|
|
Structure and application of resistive sensors - ifm
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 elements can be linear, rotational and spiral, thus converting the linear or angular displacement into the necessary ...
|
|
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: ...
|
|
Features of the ifm pressure sensor type PN
ifm pressure sensors of type PN are used in industrial applications:
One is robust: an ideal measuring element for all types of pressure scales;
Second, red-green scale: according to the color of the display, you can quickly identify the "outstanding scale" or switching state;
The third quick setting: by pressing the ...
|
|
What are the typical designs of torque sensors – ifm
Unlike load cells or force transducers, the measuring body of a torque transducer is not subjected to a tension load when used, but is torsionally affected by lever torque or torque. Therefore, torque sensors require special strain gauges to measure this type of load, i.e. torque. Canon...
|
|
Common models of IFM temperature sensors
IFM sensor is a sensor with optoelectronic devices as the conversion element, which can be used to detect non-electric amounts that directly cause changes in light quantity, such as light intensity, illuminance, radiation temperature measurement, gas composition analysis, etc.; It can also be used to detect other non-electric charges that can be converted into changes in the amount of light, such as part diameter, surface ...
|
|
Use of the ifm OGD580 laser distance sensor
The OGD580 is a spaced sensor (PNP type) with two digital output channels, each of which can be set to normally open, normally closed, or closed, depending on the requirements.
OGD580 consists of three parts: laser emitter, ...
|
|
The structure of the sensitive core of the accelerometer
Accelerometers are the most important element in engineering vibration measurement. In the test system, the sensor is the first link of data acquisition and profiling, so the selection and correct use of the sensor will directly affect the quality and accuracy of the measured signal. Although people working on engineering vibration know that this ...
|
|
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.
...
|
|
Common faults of pressure sensors – ifm
If the power supply is normal, it is necessary to carry out a simple pressurization to see if the output has changed, perhaps observe whether the zero position of the sensor has an output, assuming that it has not changed, the sensor has been damaged, otherwise it is the appearance of the damage or other links of the whole system.
...
|
|
Wireless sensor network implementation method – ifm
1. Traditional communication protocol flooding. The message is sent to a nearby node in the form of a broadcast, and the node that receives the information continues to broadcast in the same way until the audio reaches its destination.
Pros: Simple and easy to do, no maintenance required.
Cons: A certain node may ...
|
|
Method for measuring torque using angle sensors – ifm
It is difficult to measure torque on a rolling shaft, and there are several ways to do it. The most common method is to derive the torque from the energy required by the rolling shaft. In general, this means measuring the current of the motor that drives the rolling shaft. This is sketchy but inaccurate, as ...
|
|
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 ...
|
|
Select the appropriate mounting holes for ifm sensors
ifm sensors have a lot of precautions at the time of installation, and it is necessary to pay attention to the orientation of the device, if the device orientation is not suitable, it will also form damage to the pressure sensor.
The time and time requirements of ifm sensors in the installation ...
|
|
Sensors in the mass flow controller – ifm
The mass flow manipulator is a new type of flow measurement and monitoring instrument, as well as an instrument that can conveniently monitor the activity of different gases in the pipeline without temperature and pressure compensation. Its working principle is to send the flow signal measured by the heating bridge of the sensor to the amplifier for amplification, and the enlarged ...
|
|
Load cell range and accuracy – ifm
1. Sensor scale:
1) Normal use (static experiment or quasi-static experiment, when the frequency of application is not high, the scale of the sensor should be selected to consider the measured force value, as well as the component of the auxiliary tool (test fixture), etc.).
2) When used dynamically, the scale of the sensor is generally larger than the ...
|
|
Contact
working hours
