Cart ( )Intelligent control system: digital output and communication functions of pressure transmitter
2024/1/10 14:22:39
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Pressure transmitter is an industrial automation instrument that is widely used in various control systems, monitoring systems and measurement systems. It has the characteristics of high stability, high reliability and high precision, and can meet the needs of various industrial environments. In order to ensure its normal operation, a series of preventive measures must be taken. Below, we will briefly introduce the characteristics of the pressure transmitter and fault prevention measures to help you better understand and apply this important industrial instrument.
Characteristics and fault prevention methods of pressure transmitters
The characteristics of the pressure transmitter are as follows:
1. Equipped with active compensation function, the nonlinearity, temperature drift, time drift, etc. of the sensor can be actively compensated through software. It can also perform self-diagnosis, and automatically perform self-tests on the sensors after power is turned on to check whether each part is functioning properly and make judgments. This data processing method is convenient and accurate. It can actively process data according to internal procedures, such as performing statistical analysis, removing abnormal values, etc.
2. Equipped with two-way communication function. The microprocessor can not only receive and process sensor data, but also feed information back to the sensor to adjust and control the measurement process. In addition, it can store sensor characteristic data, configuration information, compensation characteristics, etc.
3. Provide digital interface output function to facilitate the connection of digital signal output with computers or field buses.
Pressure transmitters are commonly used to monitor tank levels in a variety of industries. If these pressure measurements are inaccurate, equipment damage, process changes, and other costly consequences can result, especially when used in small tank vessels and low pressure ranges. There are many types of liquid level sensors available on the market, including floating, ultrasonic, and laser, to suit most applications.
How to prevent pressure transmitter failure
1. Avoid pressure transmitter failure through model selection
When selecting a pressure transmitter, you should pay attention to the pressure range of the measured medium and select an appropriate pressure transmitter measurement range. In addition to the measurement range, the turndown ratio is also a key technical indicator, which will affect the measurement accuracy of the pressure transmitter. Therefore, when selecting, the appropriate range and turndown ratio should be selected according to specific requirements. In addition, pay attention to the maximum pressure-bearing capacity of the pressure transmitter. Usually 1.5 times the design pressure is selected. However, under certain special working conditions, pulses or sudden pressure increases may occur. In this case, a buffer needs to be selected as Protection device for pressure transmitter to avoid damage.
At the same time, the measurement method and contact material of the pressure transmitter should be selected according to the process characteristics of the medium being measured. If the measured medium is dry gas or pure liquid and the viscosity is not high, you can choose an ordinary pressure transmitter and install two valve groups in front of the meter for maintenance. However, if the measured medium is a highly corrosive liquid or a viscous liquid, you need to choose a corrosion-resistant diaphragm pressure transmitter. You can also choose a diaphragm pressure transmitter with a convex diaphragm according to the actual situation. When measuring high/low temperature media, it is best to choose a split pressure transmitter and use a pressure tube or capillary tube for pressure measurement. If you choose the capillary pressure guide method, be sure to pay attention to the operating temperature requirements to avoid the problem of vaporization or solidification of the pressure guide oil in actual use.
2. Avoid pressure transmitter failure during installation
The location of the pressure point of the pressure transmitter is clearly stipulated in the national standards. Therefore, during the design, the national standards must be strictly followed to ensure the quality of the automation instrument project. For specific installation methods, please refer to relevant standard documents and will not be detailed here.
The above is a brief introduction to the characteristics of pressure transmitters and fault prevention methods. Hopefully this information will help you better understand and apply this critical industrial instrument.
Characteristics and fault prevention methods of pressure transmitters
The characteristics of the pressure transmitter are as follows:
1. Equipped with active compensation function, the nonlinearity, temperature drift, time drift, etc. of the sensor can be actively compensated through software. It can also perform self-diagnosis, and automatically perform self-tests on the sensors after power is turned on to check whether each part is functioning properly and make judgments. This data processing method is convenient and accurate. It can actively process data according to internal procedures, such as performing statistical analysis, removing abnormal values, etc.
2. Equipped with two-way communication function. The microprocessor can not only receive and process sensor data, but also feed information back to the sensor to adjust and control the measurement process. In addition, it can store sensor characteristic data, configuration information, compensation characteristics, etc.
3. Provide digital interface output function to facilitate the connection of digital signal output with computers or field buses.
Pressure transmitters are commonly used to monitor tank levels in a variety of industries. If these pressure measurements are inaccurate, equipment damage, process changes, and other costly consequences can result, especially when used in small tank vessels and low pressure ranges. There are many types of liquid level sensors available on the market, including floating, ultrasonic, and laser, to suit most applications.
How to prevent pressure transmitter failure
1. Avoid pressure transmitter failure through model selection
When selecting a pressure transmitter, you should pay attention to the pressure range of the measured medium and select an appropriate pressure transmitter measurement range. In addition to the measurement range, the turndown ratio is also a key technical indicator, which will affect the measurement accuracy of the pressure transmitter. Therefore, when selecting, the appropriate range and turndown ratio should be selected according to specific requirements. In addition, pay attention to the maximum pressure-bearing capacity of the pressure transmitter. Usually 1.5 times the design pressure is selected. However, under certain special working conditions, pulses or sudden pressure increases may occur. In this case, a buffer needs to be selected as Protection device for pressure transmitter to avoid damage.
At the same time, the measurement method and contact material of the pressure transmitter should be selected according to the process characteristics of the medium being measured. If the measured medium is dry gas or pure liquid and the viscosity is not high, you can choose an ordinary pressure transmitter and install two valve groups in front of the meter for maintenance. However, if the measured medium is a highly corrosive liquid or a viscous liquid, you need to choose a corrosion-resistant diaphragm pressure transmitter. You can also choose a diaphragm pressure transmitter with a convex diaphragm according to the actual situation. When measuring high/low temperature media, it is best to choose a split pressure transmitter and use a pressure tube or capillary tube for pressure measurement. If you choose the capillary pressure guide method, be sure to pay attention to the operating temperature requirements to avoid the problem of vaporization or solidification of the pressure guide oil in actual use.
2. Avoid pressure transmitter failure during installation
The location of the pressure point of the pressure transmitter is clearly stipulated in the national standards. Therefore, during the design, the national standards must be strictly followed to ensure the quality of the automation instrument project. For specific installation methods, please refer to relevant standard documents and will not be detailed here.
The above is a brief introduction to the characteristics of pressure transmitters and fault prevention methods. Hopefully this information will help you better understand and apply this critical industrial instrument.
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