Conductive paste, also known as conductive adhesive, is a mixture of precious metal powder and base metal powder, glass powder, and synthetic resin. It is a key material for packaging, electrodes, and interconnections of electronic components. It mainly includes two categories: sintered conductive paste and cured conductive adhesive (conductive ink). The process is that the conductive paste is a material that uniformly adds conductive powder to the adhesive and forms a conductive body after solidification. It is used for the formation of electronic circuits, the formation of electrodes for electronic components, the leading-out of lead ends, and the formation of line contacts.
Conductive pastes are generally divided into high-temperature winding type with glass powder added to the adhesive, low-temperature sintering type using synthetic resin adhesive, and UV curing type solidified by ultraviolet radiation. High temperature sintering type, usually fired at a temperature of 450 ° C to 850 ° C, while low temperature sintering type is fired at 150 ° C, with a firing time ranging from a few minutes to an hour. In addition to silver powder as the main conductive powder and metal powders such as nickel powder, copper powder, and silver plated copper powder, carbon powder is also used. In addition, synthetic resin adhesives mainly include acrylic, epoxy, and polyester systems. The use of pulp is very extensive, and many corresponding types of pulp are being developed.
In this type of liquid level measurement, the ability of the process material to conduct electrical current is used to measure the liquid level. Therefore, basically this method is mainly used for point measurement of liquid interfaces with high conductivity. Some liquid level sensing devices operate by sensing or detecting differences in electrical characteristics caused by material interference in the process. These characteristics are capacitance, conductivity, and resistance. In this level measurement, two electrodes are placed in a tank. One electrode has a small length and therefore does not extend to the maximum liquid level, while the other electrode has a good length and can extend to the maximum length. The fuel tank will be grounded and used as a common ground. In most cases, static wells are also used, so that the interface is not disturbed and erroneous measurements can be prevented.
如果工艺液位与延伸到最低液位的电极的任何部分接触，则可能形成从接地罐到电极的导电路径。如果液位上升到两个电极都可以接触导电材料的点，电流将流过电极和罐。继电器将连接到最高电平的电极，它会检测到高电平并向警报或控制设备发送信号，以便它可以纠正这种情况。
If the process level contacts any part of the electrode that extends to the lowest level, a conductive path from the grounding tank to the electrode may be formed. If the liquid level rises to a point where both electrodes can contact the conductive material, current will flow through the electrodes and the tank. The relay will be connected to the electrode at the highest level, and it will detect the high level and send a signal to the alarm or control device so that it can correct the situation.
工采网提供的英国SST 工业级光电液位传感器／光电液位开关 － LLC210D324－003工业级液位传感器是单点检测，TTL兼容数字电平信号输出。 这款传感器适用于大功率输出场合，可以直接驱动白炽灯指示灯， 声音报警器，继电器或其它情形。 一个红外LED光源和光电管探测器精确地安装在传感端的基座上， 能确保在空气中达到很好的光耦合。当感应端浸入液体，红外光会 从锥形表面透射出去，而光电管接受到的光强会变小，导致输出电平发生变化。多样化的输出电路可满足不同的应用场合。
The British SST industrial level photoelectric liquid level sensor/photoelectric liquid level switch LLC210D324-003 industrial level sensor provided by Industrial Mining Network is a single point detection and TTL compatible digital level signal output. This sensor is suitable for high-power output applications and can directly drive incandescent light indicators, audible alarms, relays, or other situations. An infrared LED light source and photoelectric tube detector are accurately installed on the base of the sensing end, ensuring good optical coupling in the air. When the sensing end is immersed in a liquid, infrared light will transmit from the conical surface, and the light intensity received by the photocell will decrease, resulting in a change in the output level. A variety of output circuits can meet different applications.