Popular science: the development history and trend of pressure transmitters

Popular science: the development history and trend of pressure transmitters

A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. It can convert the physical pressure parameters of gas, liquid, etc. felt by the load cell sensor into standard electrical signals (such as 4~20m, 0~5V, etc.) to provide secondary instruments such as indicating alarms, recorders, regulators, etc. Perform measurements, instructions and process adjustments.

Nowadays, pressure transmitters are widely used in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools, pipelines, etc. industry. Today, the editor takes you to understand the development history and development trend of pressure transmitters.

The development of pressure transmitters has generally gone through four stages:

(1) Early pressure transmitters used large displacement working principles, such as mercury float differential pressure gauges and capsules Type differential pressure transmitters, these transmitters are low accuracy and bulky.

(2) In the 1950s, a force-balanced differential pressure transmitter with higher accuracy was introduced, but the feedback force was small, the structure was complicated, and the reliability, stability, and vibration resistance were poor.

(3) In the mid-1970s, with the emergence of new processes, new materials, and new technologies, especially the rapid development of electronic technology, displacement transmitters with compact size and simple structure appeared.

(4) In the 1990s, science and technology developed rapidly. The measurement accuracy of transmitters was improved and gradually developed toward intelligence. Digital signal transmission is more conducive to data acquisition. Diffused silicon piezoresistive transmitters and capacitors appeared. Different types of transmitters, differential inductive transmitters and ceramic capacitive transmitters.

At present, the diffused silicon pressure transmitter is widely used in the market. The diffused silicon pressure transmitter is made by encapsulating an isolated silicon piezoresistive pressure sensitive element in a stainless steel shell. It can convert the felt liquid or gas pressure into a standard electrical signal for external output, which is widely used in field measurement and control of industrial processes such as water supply/drainage, heating, petroleum, chemical, metallurgy, etc.

(Pressure transmitter)

The development trend of pressure transmitter:

Today, the research field of pressure transmitter in various countries in the world is very extensive, and it has almost penetrated into various industries, but In summary, there are mainly the following trends:

1. Intelligentization: Due to the emergence of integration, some microprocessors can be added to the integrated circuit, so that the transmitter has automatic compensation, communication, self-diagnosis, and logic judgment. And other functions.

2. Integration: Pressure transmitters have been increasingly integrated with other measurement transmitters to form a measurement and control system. The integrated system can improve operation speed and efficiency in process control and factory automation.

3. Miniaturization: The market has an increasing demand for small pressure transmitters. Such small pressure transmitters can work in extremely harsh environments and require very little maintenance and maintenance. The environmental impact is also very small, can be placed in various vital organs of the human body to collect data, does not affect people's normal life.

4. Standardization: The design and manufacture of transmitters have formed certain industry standards.

5. Extensive: Another development trend of pressure transmitters is expanding from the machinery industry to other fields, such as automotive components, medical instruments, and energy and environmental control systems.

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