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.
Effects of dust, humidity and corrosiveness:
Stainless steel series products are suitable for environmental humidity > above 80%RH, and other acids and ammonia are corrosive;
Rubber seal series alloy steel products are suitable for ambient humidity <65%RH, no water infiltration, no other corrosive gases and liquids;
Welded series alloy steel products are suitable for environmental humidity <80%RH, drainage and circulation, no other corrosive gases and liquids;
Aluminum alloy series products are suitable for ambient humidity <65%RH, no water infiltration, no other corrosive gases and liquids.
In overhead weighing systems, safety and overload protection should be considered.
In flammable and explosive environments, it is necessary to choose explosion-proof sensors, and the sealed cover of explosion-proof sensors should not only consider its airtightness, but also consider the explosion-proof strength, as well as the waterproof, moisture-proof, explosion-proof and so on of the cable lead-out surface.
Second, the scale structure characteristics of the requirements
1. The installation space of the carrier. In some places where the device has space constraints, space constraints should be considered when selecting load cells.
2. Convenient device protection. Regardless of the reliability of any equipment, it is necessary to consider the protection of the device. In addition to the convenience of the device, it is also necessary to consider whether the protection during operation is convenient and whether the sensor can be replaced quickly.
3. Effect of lateral forces. When selecting a sensor, it is necessary to consider whether there are lateral forces in the operation of this weighing scale. The ability of the load cell planned according to the shear stress principle to resist lateral force is relatively strong, and the ability of the load cell planned by the principle of normal stress to resist lateral force is relatively weak.
4. The stiffness of the carrier, the base structure and the accessories. The stiffness of these structures has a direct impact on the amount of deformation and thus the accuracy of the measurements.
5. The influence of temperature on the scale body. For outdoor weighing systems with long carriers and large areas, such as truck scales, large tanks, etc., it is necessary to consider the expansion coefficient of the carrier.
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Select the appropriate mounting holes for ifm sensors
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ifm sensors are required to be checked at the time and time of the device.
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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.
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Considerations for the selection of load cells – ifm
1. Sensor scale:
(1) In normal use (static test or quasi-static test, the frequency of use is not high), the scale of the sensor should be selected to consider the force value of the measurement, but also to consider the weight of the auxiliary tool (test fixture) and so on.
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Load cell wiring method – ifm
There are four-wire and six-wire load cells. Four-wire system: EXC EXC: Power cord, that is, the DC power supply supplied by the instrument to the sensor. SIG, SIG-: The signal line, that is, the signal line output by the sensor, is output to the instrument. In addition to the above four lines, there are more than two in the four-wire system: SEN, SEN-: feedback line ...
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Features of the S-type load cell – ifm
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2、 ...
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Six-wire and four-wire wiring of load cells
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3-axis accelerometer – ifm
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Structure and application of resistive sensors - ifm
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principle
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1. Wiring according to wiring requirements
2. Connect the specified size DC power supply to the transmitter.
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2. Wire and cable protection pipes should be sealed to avoid water accumulation.
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Measuring pre-work with vibration sensors – ifm
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Guangzhou Industrial Automation Technology and Equipment Exhibition ended successfully
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