With the development of electronic technology, especially large-scale integrated circuit and computer technology, frequency weighting, detector and filter circuit in sound level meter are all realized by digital signal processing technology instead of analog circuit. This not only makes the circuit simpler and wider dynamic range, but also greatly improves the function and stability, especially for real-time spectrum analysis. A sound level meter is an instrument that measures the sound pressure level and sound level according to a certain frequency weighting and time weighting. It is the most commonly used instrument in acoustic measurement, which can approximate the noise level of industrial noise, traffic noise, environmental noise and living noise according to the characteristics of human hearing. It can be applied to the measurement of environmental noise, mechanical and electrical product noise, traffic noise, architectural acoustics and electro-acoustics.
Tag: selection guide
Static eliminators are products that protect susceptible items from the effects of static discharge. There are rules that must be followed in static elimination. A thorough understanding of these principles is necessary to obtain the best performing equipment. The following will clarify some issues to consider when choosing static elimination.
Compared with piston motors of similar power, vane air motors are smaller, lighter and less expensive. Simple design and construction allow them to operate at any installation angle in most cases. The vane motor has a wider range of speed, torque and power and is the most commonly used form of air motor.
The flexible diaphragm coupling is composed of several groups of diaphragms (stainless steel thin plates) connected with the two halves of the coupling by bolts alternately. Each group of diaphragms is formed by stacking several pieces. The relative displacement of the two shafts is a high-performance metal elastic element flexible coupling.
According to the situation of the equipment, the power consumption environment and the purpose of power protection, a suitable UPS can be selected. For low-power equipment with a built-in switching power supply, a backup UPS can generally be used. Online interactive or online UPS should be used in areas with harsh electrical environments. For equipment that does not allow intermittent time or requires sine wave AC power at all times, only online UPS can be used.
A terminal block (also called as connection terminal or terminal connector) is a modular block with an insulated frame that secures two or more wires together. It consists of a clamping component and a conducting strip. Many people are relatively unfamiliar with the terminal, because although we can use and see it in normal times, we don't know what it is and what it does.
LED lighting (LED stands for "light emitting diode" ). And you know that it's the trend of the future. Even if it is not the current trend, it can illuminate everything, from our homes to public places to the indicator lights on our electronic devices. However, with the technology advancing more and more each year, Led lighting has allowed for more flexibility in design, greater efficiency in use and a host of other benefits that affect our daily living. This article is to tell you why choose high quality and suitable LED indicator light.
Miniature circuit breaker, short for MCB, is one of the most widely used terminal protection appliances in building electrical terminal distribution devices. And this article shows the right selection of MCB based on its electrical parameters. The rated breaking capacity of MCB is the maximum short-circuit current value that can be broken without any damage to the circuit breaker. The miniature circuit breakers currently on the market generally have several rated breaking capacities, including 4.5kA, 6kA and 10kA according to the relevant technical data and design manuals provided by various manufacturers.
What factors should be taken into consideration when selecting a hydraulic motor? The first thing that should be focused on is the operating conditions of the hydraulic system, following which we should decide on the output torque, speed and power as needed so as to pick a right product model and specification.
The thyristor power controller adopts thyristor (SCR or TRIAC) as the switching component, namely, a non-contact switch that can quickly and accurately control the closing time. It serves as an essential terminal equipment for power control designed for high precision and high dynamic indicators. It is worth noting that different loads and constraints of the operation environment determine different control modes and require various supporting equipment. Among control modes there are phase angle control, distributed crossover and time proportional zero crossover. In actual use, SCR power controllers can be sorted into single-phase SCR power controllers and three-phase SCR power controllers in accordance with their load types, power supply types and power supply voltage levels. So, how should we choose the right type of power controller and bring its optimum performance into play with minimal damage? The following passages will give you the answer.
A vacuum pump is a device or equipment that uses mechanical, physical, chemical or physical chemical methods to pump the pumped container to obtain a vacuum. In layman's terms, a vacuum pump is a device that improves, generates and maintains vacuum in an enclosed space by various methods. How to choose the right vacuum pump? This article will list nine aspects for your reference.
As the climate becomes colder, heating has become a problem for many companies, especially now that the winter haze is aggravated, the country is gradually screening coal heating, and industrial heaters have become a new choice for many companies. The following passages briefly describe how to choose industrial fan heaters and how to standardize the use of industrial fan heaters.
The industrial endoscope plays an important role in the industrial inspection. As the development of technology, the industrial endoscope is used widely because the manufacturer pursues quality inspection and intact testing. There are various industrial endoscopes, and different kinds of endoscopes are used on different fields, such as petrochemical industry, aviation, and industrial machinery, etc. However, how to select an industrial endoscope?
Different kinds of industrial endoscopes have different range of application. Usually an industrial endoscope should be selected according to the position of inspected objects. The selection of the industrial endoscope is based on following factors.
Industrial camera is a key component in the machine vision system. Its most essential function is to convert the optical signal into the ordered electrical signal of the small-size high-definition industrial camera. In the machine vision system, the lens of the industrial camera are equivalent to the eyes of human beings. Its main function is to focus the targeted optical images on the photo surface of the image sensor (industrial camera). All image information of the visual system treatment can be obtained from the lens of industrial camera. The lens quality of the industrial camera will directly affect the entire performance of the visual system. As an image device, the lens of industrial camera usually constitute a complete image collecting system with the power source and camera. Therefore, the lens selection of the industrial camera is restrained by the entire system requirement. Generally, it can be analyzed and considered as the following aspects.
Inverter is a kind of transformer converting the low-voltage DC power (usually such as the power output by the battery) into the high-voltage AC high-frequency power (sine wave AC power of 220V 50Hz or 110V 60Hz). Take a 12V DC to 220V AC car power inverter as example to illustrate the working principle briefly. Firstly, the 12V low-voltage DC power in the vehicle is converted into the high-voltage DC power of around 265V, and then the 265V DC power is converted into the sine wave AC power of 220V, 50Hz. The main inner components of power inverter include the Inverter Bridge, filter circuit, oscillator, control logic circuit and so on. At present, a large amount of various power inverters are filled in various e-commerce platforms. The cheapest one is only tens of dollars, but the expensive ones can cost several hundreds or even one thousand dollars. The maximum power it sustains range from dozens of wattages to several hundreds of wattages. Then, what kind of power inverter can we choose?
Proximity sensor belongs to the non-contact static position switch. When an object approaches it at a certain distance, the proximity switch gives an action signal. Different from the mechanical position switch that needs to be applied with mechanical force, the proximity switch acquires signal by the change of medium energy between the probe and the object under test. The proximity switch is widely used and has exceeded its scope of limit and protection, and common applications include speed measurement, liquid level control, and metal detection. When you are going to buy a proximity sensor but without any suggestion of others, you will be clear after reading this article.
Gas detectors are widely used in petrochemical, environmental protection, gasoline, coal mining and other industries. For all kinds of different safety production occasions and testing requirements, the selection of a suitable gas detector must be very important for every person engaged in safety and health work.
First of all, confirm the type and concentration range of the gas to be tested. The type of gas encountered in each production department is different. All possible situations should be considered when selecting a gas detector.
Then, choose differet types of gas detector based on industrial environment - fixed gas detector and portable gas detector.
How to choose a right infrared thermometer? The first thing to think about is performance indicators, such as temperature range, spot size, working wavelength, measurement accuracy, response time, etc. Environmental and working conditions are also taken into account, such as ambient temperature, window, display and output, protection accessories, etc. Other factors, including convenience, maintenance and calibration performance and price, etc., also affect the selection of the infrared thermometer.
1P, 2P, 1P+N, 3P, 4P, 4P+N, P means that the miniature circuit breaker (MCB) is equipped with a protective pole (knife pole), N means that the neutral conductor is only equipped with knife pole, but no protection modules. Both 2P and 1P+N are called two pole switch, 4P and 3P+N are called 4 pole switch. Neutral conductor of 1P+N and 3P+N don't have protection, so they are much cheaper, the neutral conductor pole acts along with the phase line pole. Some circuit breakers divide 1P+N into two types: one adopts two module width, another adopts one module width (small size). For these poles, how to select a right miniature circuit breaker?
AC contactor is generally classified into class I, class II, class III and class IV according to the type of load, and they are respectively recorded as AC-1, AC-2, AC-3 and AC-4. AC-1 AC contactor corresponds to non inductive or micro inductive load as its control object, such as the filament lamp, resistor furnace. AC-2 AC contactor is used for starting and stopping of wound asynchronous motor. Typical application of AC-3 AC contactor is the operation of squirrel-cage asynchronous motor and the break in operation. AC-4 AC contactor is used for starting, reverse braking, reversing and jog of cage asynchronous motor. All ATO AC contactors with 24V/110V/220V coil operating at AC-3 380V or 660V.
