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2022-02-09 An Introduction of Vibration Sensor Piezoelectric acceleration sensors are widely used because of their wide frequency response, large dynamic range, high reliability, and ease of use. In general general vibration measurement, the technical indicators that users are mainly concerned with are: sensitivity, frequency range, internal structure, difference between built-in circuit type and pure piezoelectric type, field environment and subsequent instrument configuration, etc. First, the choice of sensitivity The manufacturer generally gives the sensitivity and reference range of the sensor in the product introduction or manual. The purpose is to allow the user to easily select the appropriate product when selecting the acceleration sensor with different sensitivity. The minimum acceleration measurement value is also called the minimum resolution. In consideration of the noise problem of the post-amplifier circuit, it should be far away from the minimum available value to ensure the best signal-to-noise ratio. The maximum measurement limit must consider the nonlinear effect of the acceleration sensor itself and the maximum output voltage of the subsequent instrument. Estimation method: maximum measured acceleration × sensor charge (voltage) sensitivity, whether its value exceeds the maximum input charge (voltage) value of the supporting instrument. It is recommended that if t

2022-01-18 Vibration acceleration sensor work selection Piezoelectric accelerometers are widely used due to their wide frequency response, large dynamic range, high reliability, and ease of use. In general vibration measurement, the main technical indicators of the user are: sensitivity, frequency range, internal structure, difference between built-in circuit type and pure piezoelectric type, field environment and subsequent instrument configuration. First, the choice of sensitivity The sensitivity and reference range of the sensor are generally given by the manufacturer in the product introduction or the manual. The purpose is to allow the user to easily select the appropriate product when selecting the acceleration sensor with different sensitivity. The minimum acceleration measurement is also called the minimum resolution. Considering the noise problem of the post-amplifier circuit, it should be kept away from the minimum usable value to ensure the best signal-to-noise ratio. The maximum measurement limit takes into account the nonlinear effects of the acceleration sensor itself and the maximum output voltage of subsequent instruments. Estimation method: Maximum measured acceleration × sensor charge (voltage) sensitivity, whether its value exceeds the maximum input charge (voltage) value of the instrument. It is recommended that if the measured acceleration range is selected, it can be selected in the [reference range range" of the sensor index (considering the frequency response and weight). At the same time, in the case of frequency response and quality, try to select a high sensitivity sensor to improve Subsequent instrument input signals to improve the signal to n

2022-01-11 Singapore Develops New MEMS Pressure Sensor It is reported that a team from A*STAR, a microelectronics research institute in Singapore, has produced a small sensor. The team's main goal is to create an implantable micro-medical device. Now this goal needs to rely on a wide range of sensors. Circuit research and testing. This sensor combines a stable diaphragm with an easily-sensing silicon nanowire, making the MEMS pressure sensor more stable and suitable for medical devices. In principle, designing a small pressure sensor is simple: a pressure deformable diaphragm can be embedded in a varistor. The varistor must be made of silicon nanowires, etc., which can cause resistance changes due to pressure. Made of materials. But in fact there will be problems, including circuit design and fragile components, where errors anywhere are commercial sensors. Since the diaphragm must transmit a small pressure change to the varistor and at the same time resist deformation and breakage, the choice of diaphragm material is crucial. So Luo and his colleagues thought of using silicon dioxide to show perfect pressure sensing performance. However, although silicon dioxide has superior sensing performance, it cannot overcome the weakness of bendability. Therefore, Luo changed the solution to use double-layered silicon dioxide, while placing piezoresistive silicon nanowires in between, and adding a layer of stable silicon nitride to the top layer. By etching silicon nitride and varying thickness, adjusting silicon nanowires, the team finally found the optimal combination. The last sensor successfully satisfies the resistance to deformation and mechanical damage while still providing linear changes in pressure-sensing output, meeting the requirements for high-precision medical device applications.

2022-01-05 Application principle of level sensor The level sensor can be divided into two categories: one is a continuous level sensor that continuously measures the level change; the other is a switch level sensor that is a point meter for the point measurement. Currently, switch level sensors are widely used than continuous level sensors. It is mainly used for threshold control, overflow and idling prevention of process automatic control. Continuous level sensors are mainly used for continuous control and warehouse management, and sometimes for multi-point alarm systems. The following describes several practical level sensors and applications. 1. Capacitive Level Sensor The capacitive level sensor has two conductor electrodes (usually using the vessel wall as an electrode). Because of the change of electrostatic capacitance caused by gas, fluid or solid between the electrodes, the level can be sensitive. Its sensitive components are available in three forms, namely rods, wires and plates. The operating temperature and pressure are mainly limited by the insulating material. Capacitive level sensor can be controlled by microcomputer, realizes automatic adjustment sensitivity, and has self-diagnosis function. It can also detect damage of sensitive components, reduce insulation, cable and circuit faults, etc., and can automatically alarm and achieve high reliability. Sexual information transfer. Since the capacitive level sensor has no mechanical movable part, and the sensitive component is simple, the shape and structure are free to be large and easy to operate, it is the most widely used level sensor.

2021-12-30 Pressure Sensor Industry will Become the Highest Revenue Device in MEMS Pressure sensors are the most commonly used sensors in industrial practice. Its application is very extensive, used in various industrial automation environments. Not only related to water conservancy and hydropower, railway transportation, intelligent construction, production automation, aerospace also involves the military industry, petrochemical, oil wells, electricity, ships, machine tools, pipelines and many other industries. Shang Pu consulting machinery industry analyst pointed out that: Overall, the current domestic pressure sensor manufacturers, whether in terms of technical quality, production capacity, or in the production scale of the gap is relatively large. In this low-level competition in price wars, competition has become fierce and caused a decline in product quality. In the face of fierce market competition, pressure sensor manufacturers reduce costs through different methods, control fixed expenses, and strengthen new technology development. In the future competition, those companies with strong technical strength and good product quality will be in an advantageous position in the industry. At present, China's pressure sensor industry not only has many problems in its products, but its manufacturing companies also have certain disadvantages. At present, China's pressure sensor products still have poor reliability, insufficient research on basic technologies and manufacturing processes, poor product performance and functionality, slow product technology update cycles, and lack of dedicated solutions deve

2021-12-23 Selection and Application of Level and Level Meters Industrial production, temperature, pressure, flow, liquid level / level four thermal parameters of the measurement, the liquid level / level is very important, liquid level / level not only with the media, but also with the physical shape. The correct selection, installation and use of the instrument all directly affect the accuracy of the measurement data. Before the selection of liquid level and material level measuring instruments, in addition to familiar with the main technical performance of the instrument and its use occasions, It also requires an in-depth understanding of the process requirements. In the selection of measuring instruments, the meter's scale, function, accuracy, economy, operating conditions and suitability for media are mainly considered. Different instruments and sensors are selected for different levels and levels; pressure and differential pressure transmitters are also often used in measuring level. The role of the transmitter in automatic detection and control systems is to apply various process parameters such as temperature, pressure, flow, Levels, components, etc. are converted into a unified standard signal for display, recording or control purposes. Scale selection: The following three as

2021-12-16 How to choose the right level sensor? In the automatic production process, the liquid level detection and monitoring has always played an important role, such as the production of food and beverages, chemical products, pharmaceuticals, semiconductors, etc., cooling and lubrication of various machines, and the monitoring of the liquid level has a direct impact. The quality of the product is even related to whether the production process can proceed smoothly. At the same time, with the increase of automation, in order to ensure the consistency of product quality, the era of direct monitoring and intervention of the production process has also gone. The importance of sensors has become more pronounced, and more and more people are participating in the program system. In the design, it is no longer a simple mechanical, rough type of monitoring; therefore its requirements in addition to the reliability and stability of the test, while requiring simple installation, commissioning, compact size, application of diversification. In addition, due to the complexity and variability of the liquid level detection environment, it also brings different challenges to the application of sensors. For example: high-viscosity liquid height detection, level monitoring of wastewater containing impurities, level measurement with foam, highly corrosive liquid height alarms, and the like. Currently, there are many effective solutions for different applications in the market, but how to choose the right and cost-effective sensors has always been a headache for engineers.

2021-12-09 Introduction to Liquid Level Sensor The level sensor (static pressure level gauge / level transmitter / level sensor / water level sensor) is a pressure sensor that measures the liquid level. The static pressure input type liquid level transmitter (level gauge) is based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid. It adopts foreign advanced isolated diffusion silicon sensitive components or ceramic capacitor pressure sensitive sensors, which will be static. The voltage is converted into an electrical signal, which is then converted into a standard electrical signal (typically 4 to 20 mA / 1 to 5 VDC) by temperature compensation and linear correction. Introduction Divided into two categories: one type is contact type, including single flange static pressure / double flange differential pressure level transmitter, float type liquid level transmitter, magnetic liquid level transmitter, input liquid level change Feeder, electric inner float level transmitter, electric float level transmitter, capacitive level transmitter, magnetostrictive level transmitter, servo level transmitter, etc. The second type is non-contact type, which is divided into ultrasonic liquid level transmitter and radar liquid level transmitter.

2021-12-02 Pressure sensor thread type There are many types of pressure sensors, but the most common NPT, PT, G, and M are pipe threads. NPT is an abbreviation of National (American) PipeThread, which belongs to the American pressure sensor standard 60 degree taper thread, used in North America. National standards can be found in GB/T12716-1991. PT is the abbreviation of PipeThread. It is a 55 degree sealed taper thread and belongs to the family of the Wyeth pressure sensor thread. It is mostly used in European and Commonwealth countries. Commonly used in the water and gas pipe industry, taper is specified as 1:16. National standards can be consulted GB/T7306-2000. G is a 55 degree non-threaded seal pipe thread and is a family of Wyeth pressure sensor threads. Marked as G for cylindrical threads. National standards can be consulted GB/T7307-2001. M is a common metric thread, such as M20* indicates that the diameter is 20mm. If there is no special request from the customer, the pressure sensor produced by Yuyang is generally M20* thread. In addition, the 1/4, 1/2, and 1/8 marks in the thread refer t

2021-11-24 Pressure sensor market status With the continuous development of science and technology, measurement and automation technology requirements have been continuously improved, so there are more and more types of sensors. However, in China's pressure sensor industry, there are not only many problems in its products, but also its manufacturing enterprises have certain disadvantages. At present, China's pressure sensor products still have poor reliability, insufficient research on basic technologies and manufacturing processes, lagging in product performance and functions, slow product technology update cycles, and lack of dedicated solutions developed for use. In general, current pressure sensor manufacturers in the Chinese market have a wide gap in technical quality, production capacity, and production scale. Under the situation of low level competition, competition is becoming more and more fierce. Price warfare has become widespread and has caused this. The decline in product quality. In the face of fierce market competition, manufacturers in the industry should reduce costs through various methods, control fixed expenses, and strengthen the development of new technologies. Companies with strong technical strength and good product quality in the industry will be in a favorable position in the future competition. From the various factors that affect the competitiveness of pressure sensor companies, the optimization

2021-11-17 Differential pressure sensor characteristics Micro differential pressure sensors are characterized by ultra-sensitive and stable offsets. The chip is based on thermal gas flow measurement and incorporates a microfluidic channel. This very narrow microfluidic pathway reduces the flow rate of gas into the gas. The extremely low gas flow rate ensures that the sensor does not have to be recalibrated after connecting the tubing and the filter. The use of imported differential pressure integrated poor chip, the key components of the circuit part selected internationally renowned brand components, fully enclosed circuit, with moisture, anti-condensation, anti-leakage, lightning protection function. The shell is made of aluminum alloy or rusted steel. The two pressure ports are M10 threads or plugs. They can be mounted directly on the measuring pipe or connected through the pressure pipe. With characteristics of zero, full-scale, high precision, small temperature drift, strong anti-interference ability, stable and reliable, and low price, it has been widely used in various industries. Widely used in boiler air supply, underground ventilation, central air conditioning, air duct wind, building automation and other power, coal industry pressure process, labor pressure requirements of the laboratory, fire engineering for indoor air pressure control areas. It is also called: differential pressure sensor, pressure difference sensor, duct pressure differential pressure sensor, indoor differential pressure sensor and so on.

2021-11-10 Design of a Pressure Sensor Teste Introduction In order to adapt to the rapid detection, adjustment and repair of pressure sensors, this article determines the tested items according to a certain type of pressure sensor, and focuses on analyzing the measured parameters. It adopts Advantech IPC-610H industrial control computer and TESCOMER3000 electronic pressure controller design scheme. The software uses LabVIEW to complete development such as editing, compiling, linking, and debugging. The test data is automatically formed into a report, automatically stored and available for review, and the test record is exported in Excel format for convenient storage and printing. 1 overall design ideas This tester has strong specificity, and has high requirements on reliability and safety. The tester controls the gas circuit to simulate the water pressure environment. The pressure signal is generated by the pressure change to generate the corresponding response signal. The comparison of the specification data yields corresponding test results and displays the results on a liquid crystal display. The block diagram is shown in Figure 1. 1.1 IPC IPC uses Advantech IPC-610H. The chassis is made of all-steel 19-inch 4U standard. The backplane is a 14-slot industrial-standard passive backplane PCA-6114P4-C. The power supply uses the 250-W industry-standard power supply PS-250ATX-ZE. PCA-6010V supports dual-channel DDR2667 SDR

2021-11-04 Medium pressure air compressor pressure sensor 4 large installation precautions In the medium-pressure air compressor, the pressure sensor is a relatively important component, and it has an important relationship with the normal operation of our equipment. The installation of the sensor will affect its use, so its installation is also very important. De Nair Xiaobian summarized the four major installation precautions for the medium-pressure air compressor, hoping to help everyone. Medium pressure air compressor pressure sensor 4 large installation precautions: 1. Before the installation, an estimate should be made according to the actual situation of the whole network. 2. The installation of the medium pressure air compressor pressure sensor should be carried out along the cable. 3. In order to ensure the final safety, at least 4 pressure sensors should be installed for each cable. One end of each line should be installed, and each branch point should also be installed. The installation distance between the sensors should be less than 200m. The maintenance personnel quickly judge the point of failure. 4. The installation of the cable may be cut off on the ground, and a pressure sensor is preferably installed at the location where the change occurs. After setting the installation position, it is also necessary to use a special instrument to detect the atmospheric pressure an

2021-10-28 Difference between pressure sensor and pressure transmitter Pressure sensors usually refer to component-level products that are non-standard mV signal outputs and are the core components of pressure transmission. Due to the non-standard nature of the signal, the user needs to perform pressure calibration and design special signal processing circuits; because the signal is weak, the distance Longer need to increase the amplifier; Pressure transmitter also belongs to the pressure sensor from the written sense, but its output signal is a standard universal signal, such as 4 ~ 20mA, 1 ~ 5V, 0-5V, 0-10V, etc., can be transmitted long distances, and can be with the standard The meter set has been calibrated at the same time as its pressure value. The user needs to use the meter's range setting to use it. The difference between transmitter and sensor: The sensor consists of two parts, namely the sensor and the converter. Among them, the sensitive element refers to the part in the sensor that can directly sense or respond to the measured part; the conversion element refers to the part of the sensor that converts the sensing or response of the sensitive element into an electrical signal suitable for transmission or measurement. Because the output signal of the sensor is generally very weak, it needs to modulate and amplify it. With the development of integrated tec

2021-10-22 Difference Between Pressure Sensor and Pressure Relay and Pressure Switch The pressure switch is a function switch that automatically turns on or off when the set value is reached according to the set pressure. The pressure sensor is composed of a pressure sensitive element and a conversion circuit, and uses the pressure of the measured medium to act on the pressure sensitive element to produce a slightly varying current or voltage output. Sensors often need to be used with external amplifier circuits to complete processes from pressure detection to control and display. Since the pressure sensor is a primary component, the signal fed back by the pressure sensor needs to be processed, analyzed, stored, and controlled by the measurement and control system to make the industrial automation equipment and engineering operation control more intelligent. The pressure relay is a liquid-electric switch signal conversion element that uses liquid pressure to open and close electrical contacts. It is used to send electrical signals to control the action of electrical components when the system pressure reaches the set pressure of the relay, to achieve pump loading or discharge control, sequential operation of the actuators, system safety protection and interlocking. It consists of a pressure-displacement conversion component and a micro-switch. According to the structure type of the pressure-displacement conversion member, there are four types of plunger type, spring type, diaphragm type and bellows type. The plunger structure is divided into a single plunger type and a double plunger type. The single plunger type can be divided into three types: plunger, differential plunger and plunger-lever. According to the contact, there are single contacts and double electric shocks. The pressure swi

2021-10-21 6 commonly used sensor working principle Foreword The real world is a world of analog signals. People perceive the world through sight and touch. In the era of the Internet of Things, the sensor shoulders the mission of [five features" and perceives everything. It can be said that the current sensor development is in a state of full bloom in many fields. There are so many subdivided products, and it is not easy to list them all. Today, we talk about six sensors commonly used in the consumer field. 1. Temperature sensor Temperature sensors are used in a wide range and in many quantities, ranking first among various sensors. The development of temperature sensors has gone through three stages: traditional discrete, analog integration and new intelligent temperature sensors. The new temperature sensor is developing in the direction of intelligence and networking.

2021-09-26 Magnetostrictive liquid level sensor working principle Magnetostrictive liquid level sensor working principle Magnetostrictive liquid level sensor is based on the principle of magnetostrictive measurement developed, can accurately measure the liquid level, interface height and temperature, with high accuracy, stable and reliable, anti-jamming, installation Easy and quick, free of regular maintenance and calibration. Magnetostrictive liquid level sensors are suitable for precise measurement of various liquid surfaces and interfaces in hydrology, water conservancy, water resources, petrochemical, electric power, biologicals, grain, oil, and brewing industries. When the magnetostrictive liquid level sensor is in operation, the signal detection unit issues an interrogation current pulse, which generates a ring-shaped pulsed magnetic field along the waveguide wire. The outer tube of the sensor is equipped with a float, which floats on the surface of the liquid to move. Since the float is equipped with a set of permanent magnets, the float also generates a magnetic field. When the interrogating current pulse magnetic field interacts with the float magnetic field, a "distorted" pulse or "return" pulse is generated, and the "return" pulse propagates upward along the waveguide wire and is transmitted to the vibrator. According to the time difference between the "return" pulse and the interrogation current pulse, the actual position of the float is calculated so that the liquid level can be accurately measured.

2021-09-26 The difference between pressure sensor and liquid level sensor Pressure sensors and liquid water level sensors are common sensors that we usually have. What are the necessary connections and differences between these two sensors? Only by fully understanding the relationship between them can we better choose our own type of sensors. . First of all, the measurement principle of the pressure sensor and the liquid level sensor are similar. When the sensor is put into a certain depth in the liquid to be measured, the pressure formula of the sensor liquid receiving surface is: Ρ=ρ.g.H+Po In the formula: P is the pressure received by the level gauge on the liquid surface ρ is the density of the measured liquid g is the gravitational acceleration (according to 9.8015 when debugging) Po is the atmospheric pressure on the liquid surface H is the depth of the sensor into the liquid, meanwhile, through the air guide stainless steel The liquid pressure is introduced into the positive pressure chamber of the sensor, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor to cancel the Po on the back of the sensor, so that the pressure measured by the sensor is: ρ.gH, apparently, by measuring Pressure P, can get deep liquid level. Only the pressure sensor output is pressure P, and the level sensor output is depth H. Second, the classification of pressure sensors and liquid level sensors is different. Pressure sensors can generally be divided into strain gauge pressure sensors, ceramic pressure sensors, diffusion silicon pressure sensors, sapphire pressure sensors, piezoelectric pressure sensors. The level sensor is generally divided into floating ball level transmitter, buoyancy level transmitter, static pressure level transmitter.

2021-09-25 Ultrasonic level meter installation precautions Ultrasonic level meter installation precautions: When the probe reaches the liquid level, it will be reflected back to the probe. After receiving the probe, the probe will calculate the time from the wave to the receive wave to obtain the measurement distance. The installation height TH minus the measurement distance L will get the current level. Meter range refers to the instrument can measure the distance, the installation height TH should be less than the range. Instrument blind area refers to the instrument near the probe can not be measured in the region, the highest level and the probe spacing should be greater than the blind spot, the blind area is 0.3m, the maximum level and probe spacing must be greater than 0.3m. Wave probe is a proliferation process, that is, the direction of angle, the installation time to pay attention, or may hit the pool wall bump or channel edge. Installation principle 1) The distance from the probe launch surface to the lowest level should be less than the range of the optional instrument. 2) The distance from the probe launch surface to the highest level should be greater than the dead zone of the optional instrument. 3) The emitting surface of the probe should be parallel to the surface of the liquid. 4) The installation position of the probe should be avoided as far as it goes