German ALPECO sensor ALPECO model ALPECO price

ALPECO sensors are devices that convert mass signals into measurable electrical signal outputs. When using a sensor, the actual working environment of the sensor should be considered first. This is crucial for the correct selection of load cells, as it affects whether the sensor can operate normally, its safety and service life, and even the reliability and safety of the entire weighing instrument. There are qualitative differences between the old and new national standards in the basic concepts and evaluation methods of the main technical indicators of load cells. The main types include S type, cantilever type, spoke type, plate ring type, membrane box type, bridge type, and column cylinder type.

ALPECO sensor features

1) Since detection is performed in a non-contact manner, the detected object will not be worn or damaged. 2) Since a contactless output method is used, the service life is extended (except for magnetic types). Semiconductor output is used, which has no effect on the life of contacts. 3) Unlike optical detection methods, it is suitable for use in environments such as water and oil, and is hardly affected by stains, oil, water, etc. on the detected object during detection. In addition, products with Teflon housings and good chemical resistance are included. 4) Compared with contact switches, high-speed response can be achieved. 5) It can correspond to a wide temperature range. 6) It is not affected by the color of the detected object and detects changes in the physical properties of the detected object, so it is hardly affected by surface color, etc. 7) Unlike contact types, it is affected by ambient temperature, surrounding objects, and similar sensors, including inductive and capacitive types, where sensors mutually influence each other. Therefore, mutual interference must be considered when setting up sensors. In addition, for inductive types, the influence of surrounding metals must be considered, while for capacitive types, the influence of surrounding objects must be considered.

ALPECO sensor selection principles

1) Selection of sensitivity: Generally, within the linear range of the sensor, the higher the sensitivity of the sensor, the better. This is because only when the sensitivity is high, the value of the output signal corresponding to the change in the measured quantity is relatively large, which is beneficial for signal processing. However, it should be noted that if the sensor sensitivity is high, external noise unrelated to the measured quantity is also easily mixed in and amplified by the amplification system, affecting measurement accuracy. Therefore, the sensor itself is required to have a high signal-to-noise ratio to minimize interference signals introduced from the outside. Sensor sensitivity is directional. When the measured quantity is a single vector and has high requirements for directionality, a sensor with low sensitivity in other directions should be selected; if the measured quantity is a multi-dimensional vector, the smaller the cross-sensitivity of the sensor, the better. 2) Frequency response characteristics: The frequency response characteristics of the sensor determine the frequency range of the measured quantity, and it must remain undistorted within the allowable frequency range. In practice, the sensor response always has a certain delay, and the shorter the delay time, the better. The higher the frequency response of the sensor, the wider the measurable signal frequency range. In dynamic measurements, response characteristics should be selected according to the characteristics of the signal (steady-state, transient, random, etc.) to avoid excessive errors. 3) Linear range: The linear range of a sensor refers to the range where the output is proportional to the input. Theoretically, within this range, the sensitivity remains constant. The wider the linear range of the sensor, the larger its measuring range, and it can ensure a certain measurement accuracy. When selecting a sensor, once the type of sensor is determined, the first thing to check is whether its measuring range meets the requirements. However, in reality, no sensor can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, a sensor with small nonlinear error can be approximated as linear, which brings great convenience to measurement. 4) Stability: The ability of a sensor to maintain its performance unchanged after a period of use is called stability. Factors affecting the long-term stability of a sensor, in addition to the sensor's own structure, are mainly the sensor's operating environment. Therefore, to ensure good stability of the sensor, the sensor must have strong environmental adaptability. Before selecting a sensor, its operating environment should be investigated, and a suitable sensor should be selected according to the specific operating environment, or appropriate measures should be taken to reduce the impact of the environment. Sensor stability has quantitative indicators. After exceeding the service period, recalibration should be performed before use to determine whether the sensor's performance has changed. In some occasions where the sensor is required to be used for a long time and cannot be easily replaced or calibrated, the stability requirements for the selected sensor are stricter, and it must be able to withstand long-term tests.5) Accuracy: Accuracy is an important performance indicator of a sensor and is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive its price. Therefore, the accuracy of the sensor only needs to meet the accuracy requirements of the entire measurement system, and it is not necessary to select too high accuracy. This allows choosing cheaper and simpler sensors among many sensors that meet the same measurement purpose. If the measurement purpose is qualitative analysis, a sensor with high repeatability accuracy can be selected, and it is not advisable to select one with high absolute value accuracy; if it is for quantitative analysis and precise measurement values must be obtained, a sensor with an accuracy grade that meets the requirements must be selected. For some special application occasions where suitable sensors cannot be selected, sensors need to be designed and manufactured by oneself. The performance of self-made sensors should meet the usage requirements.

ALPECO sensor precautions for use

1) High-temperature environments cause problems for sensors such as melting of coating materials, opening of solder joints, and structural changes in internal stresses of the elastic body. For sensors working in high-temperature environments, high-temperature resistant sensors are often used; in addition, devices such as heat insulation, water cooling, or air cooling must be added. 2) Dust and moisture cause short-circuit effects on sensors. In such environmental conditions, sensors with high sealing should be selected. Different sensors have different sealing methods, and their sealing properties vary greatly. Common seals include filling or coating with sealant; mechanical fastening seal with rubber gaskets; welding (argon arc welding, plasma beam welding) and vacuum nitrogen-filled sealing. In terms of sealing effect, welded sealing is the best, and filled/coated sealant is the worst. For sensors working in clean and dry indoor environments, sensors with glue-sealed coatings can be selected, while for sensors working in humid and high-dust environments, sensors with diaphragm heat-shrink sealing, diaphragm welding sealing, or vacuum nitrogen-filled sealing should be selected. 3) In highly corrosive environments, such as humidity and acidity, which cause damage to the elastic body or short circuits in sensors, sensors with plastic-sprayed outer surfaces or stainless steel housings, which have good corrosion resistance and good sealing, should be selected. 4) The influence of electromagnetic fields on the disorderly output signals of sensors. In this case, the shielding of the sensor should be strictly checked to see if it has good electromagnetic resistance. 5) Flammability and explosiveness not only cause thorough damage to sensors but also pose a great threat to other equipment and personal safety. Therefore, sensors working in flammable and explosive environments have higher requirements for explosion-proof performance: in flammable and explosive environments, explosion-proof sensors must be selected. The sealed housing of such sensors must consider not only its sealing but also explosion-proof strength, as well as the waterproof, moisture-proof, and explosion-proof properties of the cable lead-out heads.

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