SR Systems electrical components German SR Systems models SR Systems prices

SR Systems electrical components are detection devices that can sense measured information and convert the sensed information into electrical signals or other required forms of output according to specific rules, to meet requirements for information transmission, processing, storage, display, recording, and control. The existence and development of sensors give objects senses such as touch, taste, and smell, bringing them to life; sensors are an extension of human senses. Sensors feature miniaturization, digitization, intelligence, multifunctionality, systematization, and networking. They are the primary link in realizing automatic detection and automatic control. A device or apparatus that can sense a specified measured quantity and convert it into a usable signal according to a certain rule (mathematical function law), usually composed of a sensitive element and a conversion element.

SR Systems electrical component classification

1. By application: pressure-sensitive and force-sensitive sensors, position sensors, liquid level sensors, energy consumption sensors, speed sensors, acceleration sensors, radiation sensors, thermal sensors. 2. By principle: vibration sensors, humidity-sensitive sensors, magnetic-sensitive sensors, gas-sensitive sensors, vacuum degree sensors, biosensors, etc. 3. By output signal: (1) Analog sensors can convert the measured non-electrical quantities into analog electrical signals. (2) Digital sensors: convert the measured non-electrical quantities into digital output signals (including direct and indirect conversion). (3) Pseudo-digital sensors: convert the measured signal quantity into frequency signals or short-period signal outputs (including direct or indirect conversion). (4) Switch sensors: when a measured signal reaches a specific threshold, the sensor correspondingly outputs a set low-level or high-level signal. 4. By manufacturing process: Integrated sensors are manufactured using standard production processes for silicon-based semiconductor integrated circuits. Usually, part of the circuitry for preliminary processing of the measured signal is also integrated on the same chip. Thin-film sensors are formed by depositing thin films of corresponding sensitive materials on a dielectric substrate (base plate). When using hybrid processes, part of the circuitry can also be fabricated on this substrate. Thick-film sensors are made by coating slurries of corresponding materials onto ceramic substrates, typically made of alumina, followed by heat treatment to form the thick film. Ceramic sensors are produced using standard ceramic processes or their variants (sol-gel, etc.). After appropriate preparatory operations, the formed elements are sintered at high temperatures. There are many common characteristics between thick-film and ceramic sensor processes; in some respects, the thick-film process can be considered a variant of the ceramic process. Each process technology has its own advantages and disadvantages. Due to lower capital investment required for research, development, and production, as well as the high stability of sensor parameters, it is more reasonable to adopt ceramic and thick-film sensors. 5. By measurement purpose: Physical sensors are made utilizing the characteristic that certain physical properties of the measured substance undergo significant changes. Chemical sensors are made using sensitive elements that can convert chemical quantities such as the composition and concentration of chemical substances into electrical quantities. Biological sensors are made using various biological or biomaterial characteristics to detect and identify chemical components in living organisms. 6. By composition: (1) Basic sensors are the most fundamental single transduction devices. (2) Combined sensors are sensors composed of different single transduction devices. (3) Application-specific sensors are sensors composed of basic sensors or combined sensors with other mechanisms. 7. By mode of action: Sensors can be divided into active and passive types based on their mode of action. Active sensors include acting-type and reaction-type. This type of sensor can emit a certain detection signal to the object under test, detect changes produced in the object by the detection signal, or form a signal by generating an effect in the object via the detection signal. Those detecting changes in the detection signal are called acting-type, while those detecting responses to form signals are called reaction-type. Radar and radio frequency detectors are examples of acting-type, while photoacoustic effect analysis devices and laser analyzers are examples of reaction-type. Passive sensors only receive signals generated by the object itself, such as infrared radiation thermometers and infrared imaging devices.

SR Systems electrical component structure

1, Electrodes: The electrodes of a fuel cell are the site of electrochemical reactions where fuel undergoes oxidation and oxidant undergoes reduction. Their performance depends mainly on catalyst performance, electrode materials, and electrode manufacturing processes. 2, Electrolyte membrane: Its main function is to separate the oxidant from the reductant and conduct ions. 10, Current collector: Also known as bipolar plates, they function to collect current, separate oxidant from reductant, and guide reaction gases. The performance of current collectors mainly depends on their material properties, flow field design, and processing technology.

SR Systems electrical component principles

The thermistor will remain in a non-tripped state for a long period; when the ambient temperature and current are in the c region, the heat dissipation power of the thermistor is close to its heating power, so it may or may not trip. For a thermistor at the same ambient temperature, the tripping time decreases sharply as the current increases; the thermistor has a shorter tripping time and smaller holding current and tripping current at relatively higher ambient temperatures. The PTC effect refers to a material having the PTC effect, i.e., the Positive Temperature Coefficient effect, which means that the resistance of this material increases with rising temperature. For example, most metal materials exhibit the PTC effect. In these materials, the PTC effect manifests as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect. Non-linear PTC effect: Materials undergoing phase transition exhibit a phenomenon where resistance increases sharply by several to more than ten orders of magnitude within a narrow temperature range, known as the non-linear PTC effect. Many types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymer PTC thermistors are used for overcurrent protection and are often referred to as resettable fuses (hereinafter referred to as thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are extremely suitable for use as overcurrent protection devices. The method of using a thermistor is similar to that of a conventional fuse, connected in series in the circuit. When the circuit operates normally, the thermistor's temperature is close to room temperature, and its resistance is very small, so connecting it in series does not hinder current flow. However, when an overcurrent occurs due to a fault, the thermistor's temperature rises due to increased heating power. When the temperature exceeds the switching temperature, the resistance increases dramatically instantly, and the current in the loop rapidly decreases to a safe value. After the thermistor trips, the current in the circuit drops significantly, and t is defined as the tripping time of the thermistor. Due to the good designability of polymer PTC thermistors, their sensitivity to temperature can be adjusted by changing their switching temperature (ts), allowing them to serve both over-temperature and over-current protection functions simultaneously. They are suitable for over-current and over-temperature protection of lithium-ion and nickel-metal hydride batteries. Influence of ambient temperature on polymer PTC thermistors: Polymer PTC thermistors are direct-heating, step-type thermistors. Their resistance change process is related to their own heating and heat dissipation conditions, so their holding current, tripping current, and tripping time are influenced by ambient temperature.

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