Proxitron switch German Proxitron model Proxitron price

Proxitron switch is a device that converts mass signals into measurable electrical signal outputs. When using a switch, the actual working environment of the switch should be considered first. This is crucial for the correct selection of weighing switches, as it affects whether the switch can work 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 weighing switches. The main types include S type, cantilever type, spoke type, plate ring type, membrane box type, bridge type, column cylinder type, etc.

Proxitron switch 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 with water and oil, and is hardly affected by stains, oil, water, etc. on the detected object. 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 switches, including inductive and capacitive types, where switches influence each other. Therefore, mutual interference must be considered when setting up switches. 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.

Proxitron switch selection principles

1) Selection of sensitivity: Usually, within the linear range of the switch, the higher the sensitivity of the switch, 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 switch has high sensitivity, external noise unrelated to the measured quantity is easily mixed in and amplified by the amplification system, affecting measurement accuracy. Therefore, the switch itself is required to have a high signal-to-noise ratio to minimize interference signals introduced from the outside. The sensitivity of the switch is directional. If the measured quantity is a single vector and has high requirements for directionality, a switch with low sensitivity in other directions should be selected; if the measured quantity is a multi-dimensional vector, the cross-sensitivity of the switch should be as small as possible. 2) Frequency response characteristics: The frequency response characteristics of the switch determine the frequency range of the measured quantity, and distortion must be maintained within the allowable frequency range. In fact, the response of the switch always has a certain delay, and the shorter the delay time, the better. The higher the frequency response of the switch, 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 the switch 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 switch, the larger its measuring range, and it can ensure a certain measurement accuracy. When selecting a switch, after determining the type of switch, the first thing to check is whether its measuring range meets the requirements. However, in reality, no switch can guarantee absolute linearity, and its linearity is also relative. When the required measurement accuracy is relatively low, within a certain range, a switch with small nonlinear error can be approximated as linear, which brings great convenience to measurement. 4) Stability: The ability of a switch to maintain its performance unchanged after being used for a period of time is called stability. Factors affecting the long-term stability of a switch, in addition to the structure of the switch itself, are mainly the usage environment of the switch. Therefore, to ensure good stability of the switch, the switch must have strong environmental adaptability. Before selecting a switch, its usage environment should be investigated, and a suitable switch should be selected according to the specific usage environment, or appropriate measures should be taken to reduce the impact of the environment. The stability of the switch has quantitative indicators. After exceeding the service period, it should be recalibrated before use to determine whether the performance of the switch has changed. In some occasions where the switch is required to be used for a long time and cannot be easily replaced or calibrated, the stability requirements for the selected switch are stricter, and it must be able to withstand long-term tests.5) Accuracy: Accuracy is an important performance indicator of the switch, and it is an important link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the switch, the more expensive its price. Therefore, the accuracy of the switch 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 switches among many switches that meet the same measurement purpose. If the measurement purpose is qualitative analysis, a switch 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 switch with an accuracy grade that meets the requirements must be selected. For some special usage occasions where a suitable switch cannot be selected, the switch needs to be designed and manufactured by oneself. The performance of self-made switches should meet the usage requirements.

Proxitron switch precautions for use

1) High temperature environments cause problems such as melting of coating materials, opening of solder joints, and structural changes in internal stresses of elastic bodies for switches. For switches working in high temperature environments, high-temperature resistant switches 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 switches. In this environmental condition, switches with high sealing should be selected. Different switches have different sealing methods, and their sealing properties vary greatly. Common sealing methods include filling or coating with sealant; mechanical fastening sealing with rubber gaskets; welding (argon arc welding, plasma beam welding) and vacuum nitrogen-filled sealing. From the perspective of sealing effect, welding sealing is the best, and filling/coating with sealant is the worst. For switches working in clean and dry indoor environments, switches with glue sealing can be selected, while for switches working in environments with high humidity and dust, switches 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 of the switch, switches with sprayed plastic or stainless steel outer covers, which have good corrosion resistance and good sealing, should be selected. 4) The influence of electromagnetic fields on the chaotic output signals of the switch. In this case, the shielding of the switch should be strictly checked to see if it has good anti-electromagnetic capability. 5) Flammability and explosiveness not only cause thorough damage to the switch, but also pose a great threat to other equipment and personal safety. Therefore, switches working in flammable and explosive environments have higher requirements for explosion-proof performance: in flammable and explosive environments, explosion-proof switches must be selected. The sealed outer cover of this type of switch must consider not only its sealing, but also the explosion-proof strength, as well as the waterproof, moisture-proof, and explosion-proof properties of the cable lead-out head.

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