German Galltec+mela sensor Galltec+mela model Galltec+mela price

Galltec+mela sensors are components that convert changes in non-electrical quantities (such as speed and pressure) into changes in electrical signals. Depending on the non-electrical quantity being converted, they can be classified into pressure sensors, speed sensors, temperature sensors, etc., and serve as parts and accessories for measurement and control instruments and equipment.

Galltec+mela sensor features

1) Since detection is performed in a non-contact manner, the object being detected will not suffer wear or damage. 2) Since a contactless output method is used, service life is extended (except for magnetic types); semiconductor output is used, which has no effect on contact life. 3) Unlike optical detection methods, these sensors are suitable for use in environments with water and oil, as detection is hardly affected by stains, oil, water, etc. on the object. Additionally, products with PTFE housings and good chemical resistance are included. 4) Compared to contact switches, high-speed response is achievable. 5) Capable of operating across a wide temperature range. 6) Detection is based on changes in the physical properties of the object, independent of its color, so it is hardly affected by surface color, etc. 7) Unlike contact types, these sensors are influenced by ambient temperature, surrounding objects, and other similar sensors; mutual interference occurs between sensors, including inductive and capacitive types. Therefore, mutual interference must be considered during sensor installation. Furthermore, for inductive types, the influence of surrounding metal must be considered, while for capacitive types, the influence of surrounding objects must be considered.

Galltec+mela sensor selection principles

1) Selection of sensitivity: Generally, within the linear range of the sensor, higher sensitivity is preferred. Only with high sensitivity is the output signal value corresponding to the change in the measured variable sufficiently large, which facilitates signal processing. However, note that high sensor sensitivity also makes it easier for external noise unrelated to the measured variable to mix in and be amplified by the amplification system, affecting measurement accuracy. Therefore, the sensor itself should have a high signal-to-noise ratio to minimize interference signals introduced from the outside. Sensor sensitivity is directional. If the measured variable is a single vector and high directionality is required, select a sensor with low sensitivity in other directions; if the measured variable is a multi-dimensional vector, the cross-sensitivity of the sensor should be as low as possible. 2) Frequency response characteristics: The frequency response characteristics of the sensor determine the frequency range of the measured variable, and distortion must be avoided within the allowable frequency range. In practice, sensor response always involves some delay, and shorter delay times are preferred. 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 signal characteristics (steady-state, transient, random, etc.) to avoid excessive errors. 3) Linear range: The linear range of a sensor refers to the range where output is proportional to input. Theoretically, within this range, 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 is determined, the first step is to check whether its measuring range meets the requirements. However, in reality, no sensor can guarantee absolute linearity, and its linearity is relative. When the required measurement accuracy is relatively low, sensors with small non-linear errors can be approximated as linear within a certain range, which greatly facilitates 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, apart from the sensor's own structure, are mainly the operating environment. Therefore, to ensure good stability, the sensor must have strong environmental adaptability. Before selecting a sensor, its operating environment should be investigated, and a suitable sensor should be chosen based on the specific environment, or appropriate measures should be taken to reduce environmental impact. Sensor stability has quantitative indicators; after exceeding the service period, recalibration should be performed before use to determine if the sensor's performance has changed. In applications where the sensor must be used for a long time and cannot be easily replaced or calibrated, stricter stability requirements are imposed, and the sensor must withstand long-term testing.5) Accuracy: Accuracy is an important performance indicator of a sensor and is a key factor affecting the measurement accuracy of the entire measurement system. The higher the accuracy of the sensor, the more expensive it is. Therefore, the sensor's accuracy only needs to meet the accuracy requirements of the entire measurement system; it does not need to be excessively high. This allows for the selection of cheaper and simpler sensors among many that meet the same measurement purpose. If the measurement purpose is qualitative analysis, a sensor with high repeatability accuracy is sufficient, and one with high absolute value accuracy is not necessary; if it is for quantitative analysis and precise measurement values are required, a sensor with an accuracy grade that meets the requirements must be selected. For certain special applications where a suitable sensor cannot be found, the sensor must be designed and manufactured independently. The performance of self-made sensors should meet the usage requirements.

Galltec+mela sensor usage precautions

1) High-temperature environments can cause problems such as melting of coating materials, opening of solder joints, and structural changes in internal stresses within the elastic body. Sensors working in high-temperature environments often use high-temperature resistant sensors; additionally, insulation, water cooling, or air cooling devices must be added. 2) Dust and moisture can cause short circuits in sensors. In such environmental conditions, sensors with high sealing ratings should be selected. Different sensors have different sealing methods, and their sealing effectiveness varies significantly. Common sealing methods include filling or coating with sealant; mechanical fastening with rubber gaskets; welding (argon arc welding, plasma beam welding) and vacuum nitrogen-filled sealing. In terms of sealing effectiveness, welded sealing is the best, while filled/coated sealant is the worst. For sensors working in clean, dry indoor environments, coated sealant sensors can be chosen, while for sensors working in humid, high-dust environments, diaphragm heat-shrink sealing, diaphragm welding sealing, or vacuum nitrogen-filled sensors should be selected. 3) In highly corrosive environments, such as humidity and acidity, which can damage the elastic body or cause short circuits, sensors with plastic-sprayed surfaces or stainless steel housings, offering good corrosion resistance and sealing, should be selected. 4) Electromagnetic fields can cause chaotic output signals from sensors. In such cases, the shielding of the sensor should be strictly checked to ensure it has good electromagnetic immunity. 5) Flammable and explosive environments not only cause complete damage to sensors but also pose significant threats to other equipment and personal safety. Therefore, sensors working in flammable and explosive environments have higher requirements for explosion-proof performance: in such environments, explosion-proof sensors must be selected. The sealed housing of such sensors must consider not only its sealing but also its explosion-proof strength, as well as the waterproof, moisture-proof, and explosion-proof properties of the cable lead-outs.

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