1. The core is different: the core of the communication contactor will suffer eddy current and hysteresis loss, while the DC contactor has no core loss. Therefore, the core of the communication contactor is made of mutually insulated silicon steel sheets, and is often made into an E-shape; The core of the DC contactor is made of a single piece of mild steel, and most of them are U-shaped.
2. The arc extinguishing system is different: the grid arc extinguishing equipment is used for the communication contactor, while the magnetic blowing arc extinguishing equipment is used for the DC contactor.
3. The number of turns of the coil is different: the communication electricity is transmitted when the number of turns of the communication contactor coil is less, while the number of turns of the coil of the DC contactor is more into the direct current, the communication contactor is broken by the communication circuit, and the DC contactor is broken by the DC circuit.
4. The operating frequency is different: the starting current of the communication contactor is large, the maximum operating frequency is 600 times/hour, and the operating cost is low. The operating frequency of the DC contactor can be as high as 2000 times/hour, and the operating cost is high.
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A common problem with the failure of pressure sensors – our sensors
First, the problem of the pressure sensor sealing ring
If the output of the pressurized transmitter does not change, and the output of the pressurized transmitter changes suddenly, and the zero position of the pressure relief transmitter cannot be returned, it is likely that the problem of the pressure sensor sealing ring. It is common because of the standard reason of the sealing ring, the sensor is tightened ...
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The main categories of encoders are as follows
1. Classification according to the way of engraving the disc is different
(1) Incremental type: that is, every time the angle of the unit is emitted, a pulse signal is emitted (there is also a sine and cosine signal, and then it is subdivided, and the pulse with a higher frequency is chopped), usually the output of phase A, phase B, phase Z, phase A and phase B are ...
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Fault detection of pressure sensors – we are blessed
First, the first component blocking may be the wrong way of the device, the pressure point is unreasonable, so we often emphasize that the device must be the correct device, once the installation is wrong, maybe the installation is not good, it will bury endless hidden dangers for the back. What are the primary components? Orifice plates, remote transmission measuring joints, etc.
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How torque sensors work – we are blessed
Like many other types of sensors, torque sensors are measured using strain gauge technology. The sensor is usually a metal elastomer with a strain gauge mounted on it. Strain gauges are firmly attached to the elastomer.
If an external load acts on the sensor, the measuring body will ...
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How to deal with the malfunction of the proximity sensor during work
What is the reason for the detection signal when no metal object is close to the switch?
The magnitude of the electromagnetically induced voltage is proportional to the current of the disturbance source, that is, the larger the disturbance current, the greater the disturbance voltage. If the proximity switch does not adopt any ...
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Introducing encoders
The rotary encoder is an opto-mechatronic speed-displacement sensor. When the encoder shaft rotates and the grating disc rotates, the light cut out of the slit of the grating disc is received by the receiving element and an initial signal is generated. Germany is a well-known brand. The signal is reacted to by a follow-up circuit ...
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How to make a load cell
1. Preparation of materials
The materials required for the manufacture of load cells include: thin-film resistors, elastomers, wires and adapters.
Thin film resistor sheet is a thin form of resistor, the internal resistance value of which will coup with the participation of external forces, elastomer is a more malleable ...
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How to identify the number of pulse positions in an encoder – we are blessed
The pulse encoder is a rotary encoder that uses the rotation pulse for signal output, and the main characteristics are the standard shape and diversified shape structure; The internal coding is stable, the signal output qiang, and the pulse value and positioning value are clear. Therefore, when choosing this type of punching encoder, ...
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Solutions for ultrasonic sensor applications
In industrial use, ultrasonic sensors are characterized by high reliability and versatility. Since the ultrasonic sensor measurement method works reliably in almost all environmental conditions, even the most complex tasks can be used for a secure connection for object detection or level measurement.
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Encoder classification form
1. Classification according to the way of engraving the disc is different
(1) Incremental type: that is, every time the viewpoint of the unit is rotated, a pulse signal is announced (there is also a sine and cosine signal, and then it is subdivided, and the pulse with a higher frequency is chopped), which is generally output for phase A, phase B and Z, and phase A and phase B are ...
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Failure analysis of gas sensors in different situations – we are blessed
A gas sensor is a converter that converts the volume fraction of a gas into an electrical signal. When we use gas sensors, we will inevitably encounter some problems, in this regard, we have made the following analysis:
1. Gas sensing ...
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P+F precautions for the use of safety barriers
The safety barrier, also known as the safety energy limiter, is an important part of the intrinsic safety system. There are two main types of safety barriers: P+F Zener barriers and P+f barrier barriers. The core components of the Zener barrier are Zener diodes, current-limiting resistors and fast fuse wires.
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Wireless HART technology for industrial processes
WirelessHART uses the 2.4 GHz band (which is no-nonsense and globally) as a transmission medium for a variety of radio skills, including WLAN, Bluetooth, and ZigBee. However, WirelessHART is more than just a variant of WLAN.
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The structure of proximity sensor switches – we are blessed
1. Durability
The reason why the switch has such a long life is that the switch acts as elastic from the vertical direction of the elastic membrane. Although millions of peristalsis are carried out after the elastic membrane, because the creep rate is very small, only 0.1 - 0.3m ...
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Pressure sensors are prone to malfunction – we are blessed
The first is pressure, and the transmitter can't afford to lose it. In this case, see if the pressure connector is leaking or clogged, if you admit that it is not, look at the wiring method and see if the power supply is normal, simple pressure to confirm if the output has changed, or if there is an output at the zero point of the sensor ...
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Engineered Vibration Sensor Test Methods – Blessing
In the field of engineering oscillation testing, there are various test methods and methods, but they can be divided into three categories according to the measurement methods of various parameters and the physical properties of the measurement process.
1. Mechanical quizzes
Will the works oscillate ...
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Ultrasonic sensors are easy to install and assemble – we are blessed
Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs), where ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be considered when installing and installing ultrasonic sensors?
Ultrasonic sensors are capable of being installed and operated in any orientation, ...
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The cause of drift in temperature and humidity sensors – Blessing
1. The temperature and humidity sensor will drift during use, which is impossible to avoid.
2. The fundamental reason for the drift is that all pressure sensors are based on the elastic deformation of a kind of material, no matter how outstanding the elasticity of the raw material is, after each elastic recovery, there will always be ...
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The SLP barrier is modular
In the process of modernization, the SLP series of safety barriers is gradually forming a modular safety system, constantly innovating, and on the basis of innovation, more stringent requirements for quality.
VISOLUX offers a wide range of beams ...
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The special safety barrier base plate for the H series dark horse system
The new base plate has been developed and upgraded according to the technical parameters of the Dark Horse system, and is specially adapted to the HIMax safety system. In addition to their comprehensive functionality, these baseplates also offer the look and feel of the Dark Horse System baseplates for use in non-risk areas. The new product line masks all signal types and ...
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