I often hear pressure transmitters, so what exactly does a pressure transmitter refer to? How can I choose a suitable pressure transmitter? Selection is very important. Let's take a closer look at its selection skills.
Selection tips
1. Confirm the type of pressure transmitter measuring pressure
The main types of pressure are gauge pressure, absolute pressure, and differential pressure. Gage pressure refers to the pressure that is less than or greater than atmospheric pressure based on the atmosphere; absolute pressure refers to the absolute zero pressure as the reference and is higher than absolute pressure; differential pressure refers to the difference between the two pressures.
2. Confirm the pressure range
In general, the actual measurement pressure is selected as 80% of the measurement range.
3. Confirm the introduction of measured pressure
According to the different measurement media, it can be divided into dry gas, gas liquid, strong apparel liquid, viscous liquid, high temperature gas liquid, etc. The correct selection according to different media is conducive to prolonging the service life of the product.
4. Confirm the maximum overload of the system
The maximum overload of the system should be less than the overload protection limit of the transmitter, otherwise it will affect the service life of the product or even damage the product.
5. Confirm the accuracy level
The measurement error of the transmitter is divided according to the accuracy level. Different accuracy corresponds to different basic error limits (expressed as a percentage of full-scale output). In practical applications, the selection is based on the control requirements of measurement errors and based on the principle of economic use.
6. Confirm the operating temperature range
The temperature of the measured medium should be within the working temperature range of the transmitter. If it is used over temperature, it will produce a large measurement error and affect the service life; in the production process of the pressure transmitter, the temperature effect will be measured and compensated. In order to ensure that the measurement error caused by the temperature of the product is within the range required by the accuracy level. In the case of high temperature, you can consider choosing a high-temperature pressure transmitter or taking auxiliary cooling measures such as installing a condenser tube and a radiator. 7. Confirm the compatibility of the measuring medium and contact materials
In some measurement occasions, the measurement medium is corrosive, in this case, it is necessary to select materials compatible with the measurement medium or perform special technological treatment to ensure that the transmitter is not damaged.
8. Confirm the pressure interface form?
The company's products use threaded connection (M20 × 1.5) as the standard interface form. If the customer needs other special interface forms, they can design and produce according to customer requirements.
9. Confirm the power supply and output signal
The product is powered by a DC power supply and provides a variety of output signal options, including 4 ～ 20mA, 0 ～ 5VDC, 1 ～ 5VD
C, 0 ～ 10mA and 232 or 485 digital output.
10. Confirm the on-site working environment and other needs to know whether there is vibration and electromagnetic interference, etc., provide relevant information when providing model selection, so as to take corresponding treatment. In the selection, other things such as electrical connection methods can also be considered according to the situation.
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