How to choose the calibration method of the hottes

  • Detail

How to choose the calibration method of MEMS pressure sensor

according to memes consulting, the value of measuring instruments is determined by their accuracy. Pressure sensor is also a kind of measuring "instrument", which is widely used in automobile, medical care and industry. In these applications, it is very important to ensure the accuracy of pressure sensors to ensure quality control and patient safety

piezoresistive pressure sensor, with the advantages of fast response, durability, wide range, small impact of temperature change on pressure output, and high accuracy, has become a popular choice of current measuring instruments. However, as long as the sensor has uniformity problems and temperature related errors, it needs to be corrected or compensated

there are two compensation methods for pressure sensors: active compensation and passive compensation. Passive compensation is completed by modifying the resistance in the manufacturing process. It is suitable for pressure sensors working in an environment with small temperature changes. For the environment with large temperature changes, the on-board circuit or microcontroller is used for active compensation

at this time, the temperature of the surrounding environment of the pressure sensor also needs to be measured regularly through the temperature sensor. Then it is installed on the on-board circuit to correct the temperature related error (also known as offset error, English: offset). This ensures that the temperature error of the pressure sensor is close to zero, the working range is wider and the quality is better

how to choose the calibration method of pressure sensor

there are two methods to calibrate the pressure sensor: (1) the customer calibrates the pressure sensor used in the production line; (2) The pressure sensor manufacturer shall make full compensation and hand over the pre calibrated sensor to the customer for subsequent integration

there are many reasons why customers want to complete the calibration themselves. One reason is that the customer has installed the microcontroller in the final product. In this case, the active calibration can be completed through the microcontroller

peek, the sensor packaging or assembly worker used by the customer, forms the same two component sequence in the device, which may impose a lot of stress on the pressure sensor. When this happens, the calibrated pressure sensor will produce additional pressure display due to the stress of the packaging process. The increased pressure will produce a new zero point

the disadvantage of customer calibration is that calibration is difficult to perform, and it may be highly destructive. The cost of purchasing calibrated sensors is lower than that of professional equipment and experience. The most fatal disadvantage is that customers will waste a lot of time doing calibration by themselves. Because each sensor needs to be calibrated separately, batch calibration is impossible. In addition, the temperature range required for calibration means that the equipment takes a long time to reach the required temperature limit

it is more expensive to buy fully compensated pressure sensors from manufacturers such as merit sensor than uncompensated sensors. However, it is important to weigh all factors. Time is money. If you spend too much time on calibration, it is a good choice to buy a fully compensated pressure sensor or simply insert calibration components

this is an ideal choice for those companies who want to get high output, especially those companies that do not have equipment, professional skills and processes. At present, China shares about 50million daily orders of bicycles in the whole industry to ensure calibration. Generally speaking, pressure sensor manufacturers have professional calibration personnel. This market is the first in the city to adopt electronic sampling boxes for rapid inspection, tools and professional knowledge to complete calibration

the customized solution provided by merit sensor

lp series is a pressure sensor provided by merit sensor company for ultra-low pressure applications, involving various ranges. This type of sensor is very suitable for applications such as continuous positive airway pressure (CPAP) machines, because this series is suitable for the use of non corrosive gases. The LP series offers the option of pre calibration, which means that the pressure sensor can be used immediately for medical use. It is also suitable for industrial applications. It is an ideal material for manufacturing supercapacitors, as well as air filtration systems and vital capacity measurement for medical and health care applications

pmd series launched by merit sensor is suitable for low and medium pressure applications. PMD series is suitable for air and other non corrosive liquids. This series can also measure differential pressure, absolute pressure and vacuum degree. PMD series is the most ideal pressure sensor for ink level in printers, which can work in the range of 0.34-3.5 atmospheric pressure. In this application, because of the use of an external microprocessor, the calibration is fast and direct. PMD series without compensation is also very popular products

tvc series is suitable for harsh medium environments such as high temperature fuel oil. The dielectric resistance of this series is high, which is the best choice in the automotive industry. The device adopts radial seal, which is conducive to module level integration to minimize the introduction of stress

fully compensated sensors are popular in automotive applications because they integrate time-consuming, over temperature calibration into the production process, and customers in the automotive industry are not troubled by these problems

in the past 25 years, merit sensor has accumulated rich experience in the field of piezoresistive pressure sensors. Customers who need pressure sensors may choose merit sensor products. Merit sensor provides standard and customized solutions for a variety of applications. Merit sensor can also provide uncompensated and passively compensated components for applications with small temperature range changes; And fully compensated components for applications with large temperature range changes

if the customer is unable to determine which solution is the most suitable, merit sensor can help. Merit sensor will provide customers with time, personnel and training support to find flexible and innovative solutions to help customers successfully promote their products to the market

Copyright © 2011 JIN SHI