Tag: how to

Before pipetting, it is required to make sure that the pipette, pipette tip and liquid are at the same temperature. In sucking liquid, the pipette must be kept in an upright position and the pipette tip shall be inserted 2-3 mm below the liquid surface. Before sucking the liquid, it is recommended to suck and release the liquid for several times to wet the suction nozzle (especially when it is going to suck liquid with a viscosity or when the density is different from water). At this time, two pipetting methods can be used: 

The first is the forward pipetting method. Press the button to the first stop with the thumb and then slowly release the button to the original point(suck the liquid of the fixed volume), and then press the button to the first stop point to drain out the liquid, wait for a while, continue to press the button to the second stop point to blow out the residual liquid, and release the button in the end.

Fiber laser marker is a kind of laser marker, whose principle is to output laser through the laser, and then realize the marking function through the high-speed scanning galvanometer system. The fiber laser marker has higher photoelectric conversion rate, faster marking speed and smaller volume than the ordinary laser marker. What’s more, because of the characteristics of air cooling system and strong output beam quality stability, it is widely used in various industry. Here ATO shows how to buy best fiber laser marker.

The current sensor is a detection device that can sense the information of the measured current and convert the sensed information into an electrical signal that meets a certain standard or other required form of information output to meet the transmission of information, processing, storage, display, recording and control requirements. As the main components in the control and transmission system, the Hall current sensor plays an important role in the overall stability of the equipment. Hall current sensors are widely used in various industries such as frequency control, battery detection, power supply, servo, welding machine power supply, photovoltaic inverter, wind power inverter, electroplating, locomotive and so on.

The manufacturing process of the current sensor is very complicated and has many operation steps. Now ATO shows you how to make current sensor, so that you can have a better understanding of the current sensor.

Rotary viscometer is widely used to measure the dynamic viscosity of various fluids such as grease, paint, coating, plastic, food, medicine, adhesive and so on. It is popular because of the simple structure, cheap price, convenience and practicality. But in the process of communicating with customers, it was found that many of them have some doubts about how to use the rotational viscometer correctly. Now ATO will tell you the correct use of rotational viscometer, so that you can use ATO’s rotational viscometer more efficiently and conveniently.

The pressure washer is a machine that washes the surface of objects by a power unit to generate high-pressure water from high-pressure piston pump. It can remove and wash away the dirt to reach the purpose of clean the surface of objects. Using high-pressure water column to clean the dirt, high-pressure washes is a clean way that is the most scientific, economic and environmental in the world. However, how to choose a pressure washer?

The "input" and "output" terminals of a isolation transformer should be short-circuited to test their insulation resistance against the ground wire by a megohmmeter. When measuring by 1000V megohmmeter, the resistance value is greater than 2M ohms. The cross-sectional area of the isolation transformer input and output power lines should meet the requirements of its current value. It is appropriate to configure the electric current density of 2 ~ 2.5a /mm2.

Limit switch is a device that makes use of the collision of the machine moving parts to make the contacts operating to realize the control circuit is turned on or off, so as to achieve a certain control purpose. It cooperates with other devices to form more complex automation equipments in industry. Therefore, selecting more suitable limit switches will make the entire automatic control system becomes more reasonable and efficient.

For the digital crane scale, in order not to affect its weighing result, it is required to calibrate it regularly. After investigation, many customers either neglect to calibrate the digital crane scale or have the incorrect calibration method. Now let's introduce you how to calibrate the digital crane scale correctly.

After receiving the product, many customers find that the power of the voltage stabilizer is too small, and the functions are not enough, resulting in returns and replacements, unnecessary shipping costs, and waste of time and money. ATO explains how to buy the correct automatic voltage stabilizer to you.

The insulation performance of electrical equipment is usually judged by measuring its insulation resistance. In order to ensure the personal safety and the operation safety of electrical equipment, a minimum requirement is imposed on the insulation resistance between conductors of different phases or between the conductor and the equipment casing. In power engineering, the insulation resistance is measured quantitatively through an insulation tester, also called megohmmeter or megger, so as to determine whether there are insulation problems or hidden safety hazards.

The relay contacts’ jumping or switching on/off will cause the change of inductive load and further gas discharge. The current of relay contact on-off is small, there will be no electrical arc between contacts, but there will be a spark at the relay contacts. Due to the existence of inductance in the contact circuit, there will be overvoltage on the inductance when disconnecting the contact circuit. Together with the voltage supply in the contact gap, the contact gap that just separates a little will be broken down and discharged. Limited to energy, there will only be spark discharge. The conversion of capacitance between contacts and energy in inductance makes spark discharge disappear and reappear, becoming a high frequency signal, which will be crosstalk to related circuits by means of high frequency radiation, wire transmission and distributed capacitance, forming interference signals. Furthermore, spark discharges can also damage relay contacts and shorten the service life of contacts, so that sparks may ablate contact surfaces and make the surface uneven, resulting in failure of relay poor contact.

When using uninterruptible power supply (UPS) system, people tend to unilaterally believe that there is no need to maintain batteries. However, the data show that there is about one third UPS host failure or abnormal operation caused by battery failure. Therefore, it is more and more important to strengthen the proper use and maintenance of UPS battery for prolonging the service life of batteries and then reducing the failure rate of UPS system.

Step up or step down transformer is an important part of power grid operation, it's of great significance to the stable operation of the power grid. It meets different power demands by adjusting current and voltage. Once a transformer fails, it will cause great losses to the whole power grid, and further affects the normal operation of industrial production. In order to ensure the efficient operation of transformers, it is necessary to carry out a comprehensive management of the whole process of installation and application, thus reducing potential safety hazards and improving operational efficiency.

Nowadays, the magnetic flow meter (electromagnetic flow meter) has been widely applied to measuring of industrial sewage or wastewater. With a high precision and a long service life, the magnetic flow meter is the top choice for the environmental measuring industry. To choose the correct magnetic flow meter can five fuller play to the magnetic flow meter for specific purposes. Generally, the selection of the magnetic flow meter is based on the following factors including chemical attributes of the fluid medium, pipeline diameter, flow range, liner material, electrode material and output signal.

The AC contactor has found wide applications in the motor-controlled circuit. It is no exaggeration to say that the electric drive of most motors cannot be separated from the control of the AC contactor. Many electricians are very familiar with the AC contactor for their frequency use or maintenance of it. How should we calculate the AC contactor rating for the motor or other equipment and make a right choice? Let us take a look at it.

Modern industrial sensors are vastly different in principle and structure, and there are so many different types of products on the market. How can we find the ideal sensor for a specific application? When the sensor is selected, the corresponding measurement method and measuring equipment can be determined. The success or failure of measurement results largely depends on whether the selection of sensors is reasonable.

With the rapid development of industrial automation, the variable frequency drive, used for frequency conversion debugging, is thereof widely used. As an important role of frequency conversion speed regulation and energy saving, VFD is mainly used to control the AC motor's power control equipment by changing the frequency of the motor's working power supply. It's not only advantageous for improving the enterprise's process and production level, but also plays an important role in energy saving. But how should we choose an appropriate VFD?

Load capacity of soft starter mainly refers to the overload capacity. Due to different working system, actual load capacity of soft starter is also different. For example, the soft starter generally bears a current of 2~4 times of rated current at starting process, and the duration is within 60s. For long-term working systems, the soft starter actually works under short-term overload during starting process. But for short-term working systems, the soft starter actually works under long-term overload during starting process. Thermal capacity of power semiconductor devices (thyristors) is very small, so the overload capacity of devices mainly depends on the overload capacity of power conductor devices and heat dissipation capacity of soft starters.

With the three-phase reactor, in regulating the speed of the original power frequency excitation, the establishment of the feedback voltage maintains the excitation current in the excitation coil to be in a rather small amplitude, which will basically not exceed the maximum value. It can reach the maximum value unless it is in full-speed operation status. The three-phase reactor is widely used in the elevator, wind power generation, solar power generation, railroad engine, metro, machine tool, welding machine, industrial washing machine, airplane, ship, electromechanical laboratory of the university and other fields.

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.