ALLEN-BRADLEY switch Germany ALLEN-BRADLEY model ALLEN-BRADLEY price

ALLEN-BRADLEY switch is a device capable of sensing the approach of an object. It utilizes the sensitivity of a displacement switch to approaching objects to detect proximity and output the corresponding switch signal; therefore, proximity switches are commonly referred to as proximity switches. It is a general term for switches that replace contact-based detection methods such as limit switches, with the aim of detecting without contacting the target object. It can detect the movement and presence of an object and convert this information into an electrical signal.

ALLEN-BRADLEY switch features

1) Since detection can be performed in a non-contact manner, there is no wear or damage to the detected object. 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, it is suitable for use in environments with water and oil, and detection 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) Can accommodate a wide temperature range. 6) It detects changes in the physical properties of the detected object without being affected by the color 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 installing switches. In addition, for inductive types, the influence of surrounding metal must be considered, while for capacitive types, the influence of surrounding objects must be considered.

ALLEN-BRADLEY switch selection principles

1) Selection of sensitivity: Generally, within the linear range of the switch, higher sensitivity is preferred. Only when sensitivity is high is the output signal value corresponding to the measured change relatively large, which is beneficial for signal processing. However, it should be noted that high switch sensitivity makes it easy for external noise unrelated to the measured quantity to mix in and be 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. Switch sensitivity is directional. When the measured quantity is a single vector and high directionality is required, 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 low 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 practice, switch response always has a certain delay, and shorter delay time is preferred. 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 a switch refers to the range where output is proportional to input. Theoretically, within this range, 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 relative. When the required measurement accuracy is low, a switch with small non-linear error can be approximated as linear within a certain range, which brings great convenience to measurement. 4) Stability: The ability of a switch to maintain its performance unchanged after a period of use is called stability. Factors affecting the long-term stability of a switch, in addition to the switch's own structure, are mainly the operating environment of the switch. Therefore, to ensure good stability of the switch, the switch must have strong environmental adaptability. Before selecting a switch, its operating environment should be investigated, and a suitable switch should be selected according to the specific operating environment, or appropriate measures should be taken to reduce the impact of the environment. Switch stability has quantitative indicators. After exceeding the service life, recalibration should be performed before use to determine whether the switch performance has changed. In some applications where the switch is required for long-term use and cannot be easily replaced or calibrated, the stability requirements for the selected switch are stricter, and it must withstand long-term testing.5) Accuracy: Accuracy is an important performance indicator of a switch and is a key link related to the measurement accuracy of the entire measurement system. The higher the accuracy of the switch, the more expensive it is. 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 excessively high accuracy. This allows for the selection of cheaper and simpler switches among many switches meeting the same measurement purpose, such as Atlas air compressor parts. If the measurement purpose is qualitative analysis, a switch with high repeatability accuracy can be selected, and a switch with high absolute value accuracy is not suitable; 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 application occasions where a suitable switch cannot be selected, the switch must be designed and manufactured independently. The performance of self-made switches should meet the usage requirements.

ALLEN-BRADLEY 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 humidity cause short-circuit effects on switches. In these environmental conditions, 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. In terms of sealing effect, welded sealing is the best, and filled/coated sealant is the worst. For switches working in clean, dry indoor environments, glue-sealed switches can be selected, while for switches working in humid, high-dust environments, diaphragm heat-shrink sealing, diaphragm welding sealing, or vacuum nitrogen-filled switches should be selected. 3) In highly corrosive environments, such as humidity and acidity, which cause damage to elastic bodies or short circuits in switches, 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 switch output disorder signals. In this case, the shielding of the switch should be strictly checked to see if it has good electromagnetic immunity. 5) Flammable and explosive environments not only cause thorough damage to switches 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 such switches must consider not only its sealing but also explosion-proof strength, as well as the waterproof, moisture-proof, and explosion-proof properties of cable lead-outs.

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