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02

2022-03

Dc signal isolator basic common sense?

I believe that a lot of friends are not clear, in order to enhance our understanding, the following small series of specific introduction to this issue, interested in a look at it! If you are also interested, you may wish to check it out here.

2022-03-02

Dc signal isolator basic common sense?

14

2022-02

Classification of explosion-proof grade and introduction of relevant parameters

Definition of Intrinsically Safe Equipment Marking Ex-Explosion-proof mark ia-explosion-proof class Ga-Equipment protection class Ⅱ C- gas group a Ga]Ⅱ C. The company's products explosion-proof level:[Ex ia Ga]Ⅱ C. Explosion-proof grade ia: The explosive gas mixture cannot be ignited under normal operation, one count failure and two count failures. The intrinsically safe end of the safety barrier of this level can be connected to the intrinsically safe equipment in the hazardous areas of Zone 0, Zone 1 and Zone 2. Class "ia" electrical equipment must adopt a "triple" design for components that are susceptible to interference. ib: The explosive gas mixture cannot be ignited under normal operation and one count failure. The intrinsically safe end of the safety barrier can be connected to the intrinsically safe equipment in Zone 1 and Zone 2 hazardous locations. Class "ib" electrical equipment must be dually designed for components susceptible to interference. IC: under normal working conditions can not ignite explosive gas mixture. The intrinsically safe end of the safety barrier of this rating can be connected to the intrinsically safe equipment in the hazardous area of Zone 2. Gas Group Group I electrical equipment: used in coal mine environments susceptible to methane. Group II electrical equipment: can be used in explosive hazardous environments except coal mines. Group II electrical equipment can be further subdivided according to the different ignition energy of flammable substances. Each subgroup is distinguished by capital English letters. As can be seen from the following table, group ⅡC requires the least ignition energy, that is, in this group of electrical equipment, group ⅡC equipment has versatility for groups ⅡA and ⅡB. Temperature Class The equipment temperature class specifies the maximum allowable temperature value of the equipment surface. The temperature level of the equipment must be less than the ignition temperature of the combustible material used in the dangerous place environment, otherwise it will cause combustion and explosion. As can be seen from the above table, the vast majority of common explosive gases belong to the temperature group above T4. Zone division of explosive hazardous locations In the design of safety explosion-proof system and the selection of explosion-proof products, in addition to the need to classify and group the gases existing in the explosive environment, the area division of explosive gas dangerous places should be carried out according to the frequency and duration of explosive gas occurrence: The company's ia class II C gas group products are suitable for zone 0, zone 1 and zone 2 at the same time. Safety barrier intrinsically safe performance certification parameters Maximum voltage (Um) The highest voltage (AC effective value or DC voltage value) that can be applied to the non-energy-limiting connection device of the associated equipment without invalidating the explosion-proof type. Maximum input voltage (Ui) The highest voltage (AC peak or DC) applied to an intrinsically safe circuit connection without invalidating the intrinsically safe performance. Maximum output voltage (Uo) The highest output voltage (AC peak or DC) of an intrinsically safe circuit that may occur under open circuit conditions when the maximum voltage (including Um and Ui) is applied to the equipment connection device. Maximum input current (Ii) The maximum current (AC peak or DC) applied to the intrinsically safe circuit connection device without disabling the intrinsically safe performance. Maximum output current (Io) The maximum current (AC peak or DC) from the intrinsically safe circuit of the electrical equipment connection device. Maximum input power (Pi) The maximum input power of an intrinsically safe circuit that may be consumed inside an electrical device when the connection of the electrical device to an external power source does not disable the intrinsically safe performance. Maximum output power (Po) The maximum output power of an intrinsically safe circuit that can be obtained from electrical equipment. Maximum internal capacitance (Ci) The total equivalent internal capacitance of the electrical equipment that occurs through the electrical equipment connection device. Maximum external capacitance (Co) The maximum capacitance of an intrinsically safe circuit that can be connected to an electrical equipment connection device without disabling the intrinsically safe performance. Maximum internal inductance (Li) The total equivalent internal inductance of the electrical equipment through the electrical equipment connection device. Maximum external inductance (Lo) The maximum inductance of an intrinsically safe circuit that can be connected to an electrical equipment connection device without disabling the intrinsically safe performance. Maximum allowable distributed capacitance of cable The difference between the maximum external capacitance (Co) allowed by the associated device and the maximum internal capacitance (Ci) of the intrinsically safe device. Maximum allowable distributed inductance of cable (Lc) The difference between the maximum allowable external inductance (Lo) of the associated equipment and the maximum internal inductance (Li) of the intrinsic safety equipment. Maximum external inductor-resistance ratio (Lo/Ro) The ratio of the inductance to the resistance of the external circuit that can be connected to the electrical equipment connection device without causing the intrinsic safety performance to fail. Most of the industrial developed countries in the world adopt the way of "parameter authentication", that is, a set of safety parameters are given to the associated equipment and field equipment, and the user can freely combine the electrical equipment of different manufacturers, from the perspective of safety, only need to meet the following relationship: Selection principle of safety barrier a) Determine the explosion-proof level of the required safety barrier according to the type of hazardous site and the explosion-proof requirements on site. The explosion-proof level of the safety barrier must not be lower than the explosion-proof mark level of the intrinsically safe field equipment; B) Provide corresponding safety barriers according to the type of equipment on site; c) Determine the maximum voltage of the safety barrier according to the maximum voltage that may exist or be generated by the instrument in the control room; d) Determine the polarity of the safety barrier according to the signal of the field device and the polarity of the power supply to the ground; the safety barrier shall be matched with the safety polarity and signal transmission mode of the on-site instrument. e) Considering the influence of the resistance voltage drop at the end of the safety barrier, determine the maximum short-circuit current of the safety barrier and whether the system can work normally; f) Whether the allowable distribution parameters of the safety barrier meet the requirements.

2022-02-14

Classification of explosion-proof grade and introduction of relevant parameters

23

2021-08

Elite Training Camp in Paroken

In 2021, Nanjing Parokeng Science and Technology Elite Training officially kicked off. Under the condition of intense hard work and joy, I hope they can return from their studies and use their learning to learn new insights, new goals and responsibilities, so that they can continue to maintain and pass on this responsibility and responsibility and continue to contribute their blood to China's automation field. The group photo before entering school is always so happy. Everyone exudes confidence and freshness, because they can't predict how tomorrow's training will be. Instead of being afraid of facing tomorrow, it is better to live boldly in the present. In the classroom, the instructor is talking about the importance of the team. Everyone gathers firewood and the flame is high. Everyone in the team is an indispensable and important member. No matter how high the martial arts are, they are afraid of kitchen knives. No matter how strong the ability is, they are not as strong as the team. This is our first day of gathering in the morning. In the hot summer, we exercise our personal will. When we feel that we can't do it, look at the people around us and tell ourselves that I can do it. This is our training of military songs under the scorching sun. In our actual work, we must not only ensure our own professionalism, but also drive the enthusiasm and professionalism of the whole team. This is an interesting little game played in the middle class. Each team member should only hold their hands together. The head and tail members each use an empty hand-held chopstick to pick up the steel balls and send them to the destination five meters away. Both the release of the hands and the falling of the steel balls are considered as failure of the challenge. In the small game, the layout of the team and the arrangement of personnel are revealed. The game's former players are eager to try. Although the physical fitness is very tired every day, and they are sweating after training, everyone takes out their bravest side to insist on not admitting defeat. The instructor is telling that if the internal affairs are sorted out, the quilt is simply folded, the great truth is revealed, and the details are not handled properly, then the ending will not be perfect. Before this training, we would not believe that we could organize our internal affairs so beautifully, but we did it. As long as we don't give up, success will come as scheduled. In physical training, every time 6 kilometers, once in the morning, once in the evening, although the initial fear can not persist, to the end more than enough, to witness their own progress. Three small team game small PK, more aware of the importance of the team. Daily think tank sharing, dedication is the basis of discipline, teammates have come to the stage to express their different views, although the number of girls in this training camp is inferior, but personal ability is really not inferior. The same proposition, different understanding, teammates are actively speaking and expressing. In a class, it is divided into several different teams, brainstorming in the production of team names and flags. Zhibo Team: Brave Progress and Strive Hard. Stormtrooper: Take the lead and go ahead. In the later activities, everyone actively shared their views, realized the importance of the team, and understood their importance in the team. Although everyone is very tired in physical training, sweat has wet their training clothes, but every Parokan's indomitable spirit is fully displayed at this moment. Creeping forward training, although many people's elbows have been worn out, but everyone is working hard for their own small team, challenging themselves, and every movement tells me that I am a Parokan elite. Looking for fun in hardship, this game tests the mutual trust between teammates. If this is a battlefield, every Parokan will be very relieved to hand over his back to any one in the team. However, looking back, he always surprises everyone inadvertently. We all completed this challenge in mutual trust. Endurance competition, to see who's willpower is stronger, down with their own is never an opponent, just yourself. After several days of training, our team has become more and more graceful. We are a team that can only fight and win battles. Don't abandon, don't give up, is our Parokan people's firm belief, not just a slogan, 10 kilometers physical fitness test, some teammates physical fitness is not good, there will always be a hand to you in the most critical moment, there is always a lot of people in your ear to encourage. The end of every physical training means the end of a period of "pain", just like singing in a song, the sun is always after the wind and rain, every Parokan people keep a hot heart in the face of difficulties, face difficulties and overcome difficulties. Whether it is physical fitness or professional knowledge, we must not forget that we are the descendants of the Chinese people and the Chinese people. No matter what we will do after graduation, we must love our country. Under the leadership of the monitor, we swear to love the motherland and the people. Time always passes in a flash, and finally it will be the time for us to graduate, and it will also be the time for us to separate. The team members saluted and thanked the instructor in turn, with tears in their eyes. Departing is for the next meeting. May we lead the future and have a bright future. This elite training empowers talents and continues to practice Parokan's corporate culture talent concept of "building a talent training system and building a high-quality talent team.

2021-08-23

Elite Training Camp in Paroken

17

2021-06

PA-1904 RS485 HUB HUB

PA-1904 is a RS-485 bus split hub (HUB) designed to solve the requirements of large RS-485 systems in complex electromagnetic field environments. It provides star RS-485 bus connection. Users can easily improve the RS-485 bus structure, divide network segments, and improve communication reliability. The product supports a transmission rate of 115.2Kbps. In order to ensure the safety and reliability of data communication, the RS-485 interface terminal adopts photoelectric isolation technology to prevent lightning surge from being introduced into converters and equipment. The built-in photoelectric isolator and 600W surge protection circuit can provide an isolation voltage of 2500V V. When lightning strike or equipment failure occurs, the network segment with problems will be isolated, which can effectively suppress lightning (Lighting) and ESD, at the same time, it can effectively prevent lightning strikes and common ground interference to ensure the normal operation of other network segments. This performance greatly improves the reliability of the existing RS-485 network and effectively shortens the maintenance time of the network. The power supply adopts an external switching power supply, which is safe and reliable and can be applied to outdoor projects.

2021-06-17

PA-1904 RS485 HUB HUB

11

2021-06

The company in the first half of the year outstanding staff glory trip

◀ In pursuit of that paroken blue ▶ Life has not only work, but also poetry and distance. Thank you for your hard work in the first half of the year. The company specially rewards outstanding employees for their four-day and three-night trip to the island. Arrive in Shanghai on the first day and enjoy the magic capital Oriental Pearl Tower, 259-meter High Glass Corridor, Challenging Courage Oriental Pearl Tower, 259-meter High Glass Corridor, Challenging Courage Night falls, night tour of Huangpu River, skyscrapers, colorful Night falls, night tour of Huangpu River, skyscrapers, colorful Goji Island, Eastern "Little Greece", Let's Go to See the Sea Paroken's thorny brother Parokan's sister riding the waves Climbing the Cliff in the East, Climbing the Peak The wizard of oz no one village, catch crabs Beautiful sunrise Xiyang Bay, sunset Excellent staff's trip to the island ended perfectly, and we will cherish time and forge ahead with more enthusiasm. Our journey is the sea of stars.

2021-06-11

The company in the first half of the year outstanding staff glory trip

14

2021-02

Working Principle, Function and Selection of Signal Isolator

Nanjing Paroken Technology Co., Ltd. Working principle: First, the signal of the transmitter or instrument is modulated and converted by semiconductor devices, then isolated and converted by light or magnetic sensing devices, and then demodulated and converted back to the original signal before isolation. At the same time, the power supply of the isolated signal is isolated. Ensure that the transformed signal, power supply and ground are absolutely independent. Function: One: Protect the control loop of the lower level. Two: weaken the influence of environmental noise on the test circuit. Third, inhibit the interference of public grounding, frequency converter, solenoid valve and unknown pulse to equipment; At the same time, it has the function of limiting pressure and limiting current for lower-level equipment, which is the faithful protection of transmitter, instrument, frequency converter, solenoid valve PLC/DCS input and output and communication interface. Standard series guide rail structure, easy to install, can effectively isolate: input, output and power supply and the potential between the earth. Can overcome the inverter noise and a variety of high and low frequency pulsation interference. The main types of signal isolators are 1) Isolator:(PA-1187) In industrial production, in order to increase the load capacity of the instrument and ensure that the instruments connected to the same signal do not interfere with each other, improve the electrical safety performance. it is necessary to collect, amplify, calculate and carry out anti-interference processing on the input signals such as voltage, current or frequency and resistance, and then output the isolated current and voltage signals, which can be safely sent to the secondary instrument or plc\\dcs for use. 2) Distributor:(PA-1317) Industrial sites generally need to adopt a two-wire transmission mode, which not only provides 24V power distribution for primary instruments such as transmitters, but also outputs isolated current and voltage signals after collecting, amplifying, calculating and anti-interference processing the input current signals for use by subsequent secondary instruments or other instruments. 3) Safety barrier:(PRG-1100) Some special industrial sites (such as gas companies and chemical plants) not only need two-wire transmission, but also need to provide power distribution and signal isolation functions. At the same time, they also need to have safe spark explosion-proof performance, reliably contain power supply, prevent ignition between power supply, signal and ground, limit current and step-down double limit signals and power circuits, and limit the energy entering dangerous places within the safe quota range. Signal isolator installation and maintenance should pay attention to what matters Due to different manufacturers, the production process and wiring definition of the isolator are not all the same, but the use occasions are basically the same, so the protection requirements and maintenance of the product are basically the same. 1. Read the instructions carefully before use. 2. When used as signal isolation, the input terminal should be connected to the loop circuit, and the output terminal should be connected to the sampling circuit. 3. When used as an isolated power distribution, the input terminal should be incorporated into the power supply circuit, and the output terminal should be connected to the transmitter. 4. If it does not work normally, first check whether the wiring is correct, and pay attention to whether the power supply is correct and the polarity is anyway. Sometimes the field signal received by the PLC has a large error and poor stability. There are many reasons for this phenomenon, and the potential difference between different instrument signal reference points is an important factor. Because of this "difference", the interference current is generated between the instrument signals, resulting in large PLC errors and poor stability. Therefore, it is the best condition that the signals of different equipment and instruments have a common reference point. The isolator completely isolates the input/output electrically and forms a common reference point in the PLC analog interface board to solve the problem of achieving the ideal situation. The 4-20mA channel is isolated, and there is no space for power supply in the cabinet. What should I do? A passive signal isolator that provides 4-20mA signal isolation without the need for an external power supply. Now the market has so many brands of isolators, the price is uneven, how to choose? The isolator is located between the two system channels, so the selection of the isolator must first determine the input and output functions, and at the same time, the input and output modes of the isolator (voltage type, current type, loop power supply type, etc.) should be adapted to the front and rear channel interface modes. In addition, there are many important parameters related to product performance, such as precision, power consumption, noise, insulation strength, bus communication function, etc., for example, noise is related to precision, power consumption and heat is related to reliability, which need to be carefully selected by users. In short, applicable, reliable and cost-effective products are the main principles for selecting isolators. The on-site two-wire pressure transmitter signal received by DCS is unstable, how to solve it? The two-wire transmitter is used frequently in the field of industrial automation. Like other industrial field equipment, the two-wire transmitter also has the problem of interference and anti-interference. According to the interface mode of DCS analog board (current type or loop power supply type), the isolation distributor with different functions is selected. In principle, it is required to provide isolated power supply to the transmitter, ensure that each transmitter has an independent power supply, and isolate the transmitter signal to DCS. The PLC analog board interface is a two-wire loop power supply mode, and the signal needs to be isolated. How should the product be selected? Two-wire loop power supply is a common analog interface. Products suitable for this interface are called two-wire circuit isolation series products. The isolation device inside the isolation transmitter adopts the transformer mode, on the one hand, it transmits the signal, on the other hand, it also transmits the electric energy of the power supply end to the input part, so that the various circuits of the input part can work normally.

2021-02-14

Working Principle, Function and Selection of Signal Isolator
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