Tag: what is

The full name of RTD is Resistance Temperature Detector. RTD is a special kind of resistor whose resistance value increases as the temperature increases and decreases as the temperature decreases. RTD is used as sensor in industry to measure temperature, so RTD is also called "thermal resistance". RTDs are more linear than thermocouples and are the most accurate and stable temperature sensors available. But because the change of resistance takes time, its response speed is slow. At the same time, its price is relatively expensive, and it is suitable for occasions where there are certain requirements for accuracy and the cost control is not strict.

At present, with the continuous improvement of people's living, various industries pay more and more attention to the temperature and humidity management environment of product production, equipment and warehouse storage. Therefore, it is necessary to use the temperature data loggers. The temperature and humidity data logger measures the temperature and humidity parameters and stores them in the recorder according to predetermined time intervals or uploads them to the computer cloud platform through Bluetooth or USB. The data logger can be exported and analyzed to ensure that whether there are any incidents that endanger the safety of the product during the storage and shipping. However, which industries need temperature and humidity monitoring systems?

The full name of OTDR is Optical Time Domain Reflectometer. An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize an optical fiber. It is the optical equivalent of an electronic time domain reflectometer. OTDR is widely used in the maintenance and construction of optical cable lines, and can measure optical fiber length, optical fiber transmission attenuation, joint attenuation and fault location.

Hybrid stepper motor is a stepper motor designed by combining the advantages of permanent magnet and reactive. It is divided into 2 phase, 3 phase and 5 phase. The two phase stepping angle is generally 1.8 degrees, the three phase stepping angle is generally 1.2 degrees, and the five phase stepping angle is generally 0.72 degrees.

DIP switch, short for dual in-line package switch, is an electrical switch that can be turned by hand. Its pitch includes 2.54mm and 1.27mm. There are two pins on the back of each position, all on ON side, which is turned on, and then disconnect. These pins are independent and there is no association with each other. Such products are mostly used for binary coding.

A molded case circuit breaker, also known as an installation circuit breaker, is an electrical protection device used to protect a circuit from overcurrent, which can cause an overload or short circuit. All parts are sealed in plastic housing, auxiliary contacts, undervoltage releases and shunt releases are mostly modular. Due to its very compact structure, molded case circuit breakers are basically impossible to repair. Most of them use manual operation, and large-capacity can choose electric switching. Due to the application of electronic overcurrent release, molded case circuit breakers can also be divided into two types: class A and class B. Class B has good three-stage protection characteristics, but due to price factors, the use of thermal magnetic release Class A products have a higher market share.

Hall effect magnetic proximity sensor can achieve the largest detection distance with a small switch volume. It can detect magnetic objects (usually permanent magnets), and then generate a trigger switch signal output. Since the magnetic field can pass through many non-magnetic objects, this triggering process does not necessarily require the target object to be directly close to the sensing surface of the magnetic proximity switch, but the magnetic field is transmitted to a long distance through a magnetic conductor.

A contactor is an electrical appliance that uses a current flowing through a coil to generate a magnetic field to close the contacts to complete the control of the load. As a kind of contactor, the AC contactor also controls the load, but there is an additional precondition on the original basis. The AC current flows through the coil. AC contactors have been widely used at present, high performance lighting contactors and 1 pole - 4 pole definite purpose contactors are popular AC contactors.

There are two and three positions for toggle switch operation. Three button switch and a certain side of the position is not positioned, etc. At the same time, its connection circuit types are also more. There are many kinds of button handles for toggle switches, such as metal conical knob handle, plastic conical knob handle, fluorescent knob handle, plastic sleeve knob handle, spherical knob handle, flat bar knob handle, lock bar knob handle, wave knob handle, paddle knob handle, etc. Lock lever handle is suitable for dangerous operation. There are "promote unlock" type knob handle, which is provided with a spring, screw mouth end milling groove. The operator must first lift the knob handle and then push it to another position to ensure safe work.

A centrifugal pump is a mechanical device designed to move fluid by transferring rotational energy from one or more driven rotors, called impellers. Fluid enters the rapidly rotating impeller along its axis and exits through the impeller's blade tips along its circumference by centrifugal force. The action of the impeller increases the velocity and pressure of the fluid and directs it towards the pump outlet. The pump casing is specially designed to compress the fluid from the pump inlet, direct it to the impeller, and then slow and control the fluid before discharging.

The absolute value rotary encoder is a detector that can output the angle data within one revolution of the motor to an external target. Absolute encoders are generally capable of outputting 360° with 8 to 12 bits. There are many optical channel engraving lines on the absolute encoder optical disc, and each engraving line is arranged with 2 lines, 4 lines, 8 lines and 16 lines in turn, the shaft encoder obtain a set of unique binary codes (Gray codes) from the zeroth power of 2 to the n-1th power of 2.

A brushed DC motor is a rotating motor that converts DC electric energy into mechanical energy or converts mechanical energy into DC electric energy with a built-in brush device. Different from the DC brushless motor, the brush device is used to introduce or draw DC voltage and DC current. BDC motor is the basis of all motors, which has the characteristics of fast starting, timely braking, smooth speed regulation in a large range, and simple circuit control.

Butterfly valve is a kind of regulating control valve with a simple structure. The butterfly valve can be used for switching control of low pressure pipeline medium, which rotates around the valve shaft to achieve opening and closing. Butterfly valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

RC servo motor, short for radio control servo motor, can also be regarded as a DC servo motor, but its characteristics and application fields are different from DC servo motors. RC servo motors are mostly used for steering control of remote control models. Potentiometers (variable resistors) are used to detect the position, and the rotation angle can reach 180°.

AC synchronous generator is a mechanical device that converts other forms of energy into electrical energy. The AC synchronous alternator is driven by a water turbine, steam turbine, diesel engine or other power machinery, which converts the energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy and then transmits it to the generator, at last, it converted into electrical energy by a generator. Brush alternator is widely used in industrial and agricultural production, national defense, science and technology and daily life.

Single phase motors generally refer to low-power single phase asynchronous motors powered by a single phase AC power supply. It is also called a single phase induction motor. This kind of motor usually has two phase windings on the stator, and the rotor is of ordinary squirrel cage type. The distribution of the two phase windings on the stator and the different power supply conditions can produce different starting characteristics and operating characteristics.
Single phase motors have a large production volume and are closely related to people's daily lives. Especially with the improvement of people's living standards, the consumption of single phase motors for household appliances is also increasing.

Squirrel cage induction motor is the simplest and most widely used type of asynchronous motor. Its rotor coil is cast aluminum and shaped like a squirrel cage, so it is called a "squirrel cage motor". These motors are a specific kind of induction motor, which uses the electromagnetic induction effect to transform electrical current into rotational energy. This article will explain the principles of squirrel cage motors, their specifications, and what kinds of applications they are used for. This way, we can make informed choices when choosing the right motor.

Dosing pumps are available in thick sections and non-adjustable flow, the former is more widely applicable. The flow star is mainly adjusted by changing the stroke length, such as changing the crank radius, the plunger returns when the backstop position and the plunger rod and crosshead connection between the evolution, but also by changing the number of reciprocations or both methods to adjust the flow.

Speed reducers primarily serve two purposes. First, they can multiply the torque generated by the input power source to increase the amount of usable work. Second, they are used to reduce the input power source speed to achieve desired output speeds. For this reason, a smaller, less expensive motor with a speed reducer may enjoy wider application fields than a larger motor without one.

Explosion-proof motor is a type of motor with explosion-proof performance. It is a kind of motor that can be used in flammable and explosive places, and it does not produce electric sparks during operation. It has a structure different from that used in ordinary environments. It can prevent the combustible gas and dust outside the motor from entering the motor to the greatest extent, or even if it enters, it will not ignite the combustible gas and dust in the surrounding environment from the flame out of the casing when short-circuited and caught in the interior.