First, according to the working principle: electromagnetic, magnetoelectric, electric, inductive, rectifying, thermoelectric, electrostatic, electronic and so on.
Second, according to the nature of the measurement: there are ammeter, voltmeter, power meter, ohmmeter, electricity meter, power factor meter, frequency meter, multimeter and so on.
Third, according to the way of use: switch board and portable.
Switch panel meters are usually fixed on the switch board or switchboard with large errors. Portable meters generally have small errors and high accuracy.
Fourth, according to the working current points: there are DC instruments, AC instruments, AC and DC meters.
Composition of electrical instruments
Commonly used electrical instruments are mainly made of bakelite or iron or hard plastic, panels with scales and symbols, measuring lines (simple meters), head electromagnetic systems, pointers, dampers, shafts, bearings, springs , zero adjuster and other components.
Electrical instrument requirements
In order to ensure the accuracy and reliability of the measurement results, the following requirements are imposed on the electrical instrument:
1. High accuracy and small error, the value should meet the requirements of the accuracy;
2. The error should not change with the influence of external environmental conditions such as time, temperature, humidity, and external magnetic field;
3. The power consumption of the meter itself should be as small as possible. Otherwise, when measuring small power, it will cause a large error;
4. The meter should have sufficient insulation strength and pressure resistance, and should also have the ability to withstand short-term overload to ensure safe use;
5, should have a good reading device, the measured value should be able to read directly;
6, the structure is sturdy, easy to use and maintain.
Glyph of electrician instrument
The dial of the electrician is marked with various symbols to indicate the type of the instrument, the object to be measured, the measurement range, the accuracy, and the conditions of use.
The accuracy level of electrical instruments is divided into seven levels of 0.1, 0.2, 0.5, 1.0, 1.5, 2.5, and 5.0. The smaller the number, the higher the accuracy.
According to the ability to resist external magnetic field or electric field interference, it is divided into I, II, III, IV, etc., among which I has the best defense ability.
According to the conditions of use, it is divided into three groups: A, B, and C. Groups A and B are used indoors, and group C is used for outdoor or ship, aircraft, and vehicle.
Maintenance of electrical instruments
1. Strictly follow the instructions, save and use in the temperature, humidity, dust, vibration, electromagnetic field and other conditions.
2. After long-term storage, the meter should be energized regularly to check and remove moisture.
3. After long-term use of the instrument, the necessary inspection and correction shall be carried out according to the electrical measurement requirements.
4. Do not disassemble and debug the instrument at will, otherwise it will affect its sensitivity and accuracy.
5. For the instrument with battery in the table, pay attention to check the discharge condition of the battery. If it is not user, it should be replaced in time to avoid the battery electrolyte overflowing and corroding the machine. For instruments that are not used for a long time, the battery inside the watch should be taken out.
Correct use of electrical meters
How to properly use and rationally select electrical measuring instruments:
1. Select the instrument type according to the nature of the measurement object. First of all, depending on whether DC or AC is being measured, DC instruments or AC instruments can be selected. If you measure the amount of AC, you should also pay attention to whether it is a sine wave or a non-sinusoidal wave; when measuring, it is necessary to distinguish whether the measured value is the average value, the effective value, the instantaneous value, or the maximum value, and pay attention to the frequency for the AC quantity.
2. Select the instrument level according to the actual needs of the measurement object. According to the nature of the project, as long as the error of the measurement results is within the practical allowable range of the project. For example, in commonly used standards and some precision measurements, instruments with an accuracy of 0.1 to 0.2 can be used; in the experimental measurement, instruments of 0.5 to 1.5 can be used; in the factory production, instruments of 1.0 to 5.0 can be used.
3. Select the internal resistance of the meter according to the resistance of the measuring object and the measuring line. For the voltmeter that measures the voltage, the larger the internal resistance is, the better the resistance inside the voltmeter is greater than 100 times the measured object. For an ammeter that measures current, the smaller the internal resistance, the better. It is often required that the internal resistance of the ammeter is less than 100 times that of the object under test.
4. Select the allowable rating of the meter according to the measurement object. Do not use a large range of meters to measure small values ​​to avoid readings. Of course, it is even more difficult to measure the large amount of power with a small-range meter to avoid damage to the meter. Therefore, when selecting the instrument, you must carefully observe the rated voltage, rated current and rated power that the instrument and equipment are allowed to withstand.
We are a specialist automation systems integrator with our own well-equipped workshop for building electrical and industrial control panels. Our team use the very latest design and project software, to ensure traceability throughout all steps of the manufacturing process. We constantly invest in the latest electrical control system building equipment, tools, and software.
Every control system is designed to suit your specific application; using only the very best components from leading manufacturers. We are happy to build control panels from your own electrical schematics, or alternatively
Marine Control Box are strictly complying with the Marine standard and all the components are Marine Classification Certified.
Sound electrical design principles are the foundation of every industrial Control Panel we build. We use the very latest electrical design software, including ePlan Pro Panel Professional. Our engineers use Solidworks for 3D modeling of components and laser cutting our panel doors.
Being a quality driven firm, we do hard work to serve our customers in a well-systematized & successful way by presenting the optimum grade services. Our offered services are rendered by a crew of creative and talented personnel. We provide these services in accordance with the prevailing industry guidelines and set principles by using contemporary technology. In addition to this, offered services are highly in demand in the market for their outstanding features such as cost effectiveness, hassle free management and timely execution.
Cantilever Control Box ,Assembly Cantilever Control Box ,Plc Cantilever Control Box ,Electrical Distribution Box
Nantong Double Star Automation Equipment Co., Ltd. , https://www.nt-doublestar.com