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temperature pressure transmitter

time£º2019-07-08 16:37    source£ºoem pressure sensor

  gas pressure transducer

How it works
The electrical components that the pressure transmitter feels pressure are generally resistance strain gauges. Resistive strain gauges are sensitive devices that convert the pressure on the device under test into an electrical signal. The most widely used resistance strain gauges are metal resistance strain gauges and semiconductor strain gauges. Metal strain gauges are also available in strain gauges and foil strain gauges. Usually, the strain gauge is tightly bonded to the mechanical strain matrix through a special adhesive. When the stress of the base body changes, the strain gauge also deforms together, so that the resistance of the strain gauge is changed, thus increasing the strain. The voltage across the resistor changes. [4]
Main performance editing
1. It uses a wide range of measured media, and can measure oil, water and paste compatible with 316 stainless steel and 304 stainless steel, and has certain anti-corrosion capability;
2, high accuracy, high stability, selection of imported sensors, good linearity, high temperature stability;
3, small size, light weight, installation, debugging, easy to use;
4, stainless steel fully enclosed shell, waterproof;
5. The pressure sensor directly senses the measured liquid level pressure, which is not affected by the bubbling and deposition of the medium.
The main advantage of editing
1. The pressure transmitter has the characteristics of reliable work and stable performance;

2, special V / I integrated circuit, fewer peripheral devices, high reliability, easy maintenance, easy, small size, light weight, installation and debugging is extremely convenient;
3, aluminum alloy die-casting shell, three-end isolation, electrostatic spray protection layer, durable;
4, 4-20mA DC two-wire signal transmission, strong anti-interference ability, transmission distance;
5, LED, LCD, pointer three indicator head, on-site reading is very convenient. Can be used to measure viscous, crystalline and corrosive media;
6, high accuracy, high stability. In addition to the original imported sensors that have been corrected with lasers, fine compensation is provided for the integrated temperature drift and nonlinearity within the operating temperature range.
Selection rule editing
1. According to the type of pressure to be measured
The main types of pressure are gauge pressure, absolute pressure, and differential pressure. Gauge pressure refers to the pressure that is less than or greater than atmospheric pressure on the basis of the atmosphere; absolute pressure refers to the absolute pressure zero as the reference, higher than the absolute pressure; differential pressure refers to the difference between the two pressures.
2. According to the measured pressure range
Under normal circumstances, the actual measurement pressure is selected as 80% of the measurement range.
Consider the maximum pressure of the system. In general, the pressure transmitter maximum pressure range should reach 1.5 times the maximum pressure value of the system. Some water pressures and process controls have pressure spikes or continuous pulses. These spikes may reach 5 or even 10 times the "maximum" pressure and may damage the transmitter. Continuous high-voltage pulses that approach or exceed the maximum rated pressure of the transmitter will shorten the useful life of the transmitter. However, increasing the transmitter pressure rating will sacrifice the resolution of the transmitter. Buffers can be used in the system to attenuate spikes, which can reduce the sensor's response speed.
Pressure transmitters are generally designed to withstand maximum pressure for 200 million cycles without degrading performance. A trade-off solution can be found between system performance and transmitter life when selecting the transmitter.
3. According to the tested medium
According to different measurement media, it can be divided into dry gas, gas liquid, strong corrosive liquid, viscous liquid, high temperature gas liquid, etc. According to the correct selection of different media, it will help extend the life of the transmitter.
4. According to the system's maximum overload
The maximum overload of the system should be less than the overload protection limit of the transmitter, otherwise it will affect the life of the transmitter or even damage the transmitter. Usually the pressure overload of the pressure transmitter is 2 times full scale.
5. According to the required accuracy level
The measurement error of the transmitter is divided according to the accuracy level, and different accuracy corresponds to different basic error limits (expressed as a percentage of the full-scale output). In practical applications, the selection is based on the control requirements of measurement errors and on the principle of economical use.
6. According to the system operating temperature range
The temperature of the measuring medium should be within the operating temperature range of the transmitter. If it is used at overtemperature, it will produce a large measurement error and affect the service life of the transmitter. In the production process of the pressure transmitter, it will affect the temperature. Measure and compensate to ensure that the measurement error caused by the temperature is within the accuracy level requirements. In the occasion with high temperature, you can consider choosing high temperature pressure transmitter or adopt auxiliary cooling measures such as installing condensing tube and radiator.
7. According to the measurement medium and contact material compatibility
In some measurement occasions, the measuring medium is corrosive. In this case, it is necessary to use materials compatible with the measuring medium or perform special processing to ensure that the transmitter is not damaged.
8. According to the pressure interface form
It is usually threaded (M20×1.5) as standard interface.
9. According to the power supply and output signal
The pressure transmitter is usually powered by a DC power supply and provides a variety of output signal options, including 4 to 20 mA. DC;, 0 ~ 5V. DC, 1 to 5V. DC, 0 ~ 10mA. DC, etc., can have 232 or 485 digital output.
10. According to the working environment of the site and other
Whether there is vibration, electromagnetic interference, etc., the relevant information should be provided when selecting a type, so that corresponding treatment can be taken. When selecting a type, other methods such as electrical connection can also be considered according to the specific circumstances.

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