Differences between a Pressure Sensor and a Pressure Transmitter

What is a pressure sensor?

A pressure sensor is a device or device that can sense pressure and convert pressure signals into available electrical signals according to certain rules. There is no amplifying circuit inside the pressure sensor, the full-scale output is generally millivolt level, and the load capacity is low, so it cannot be directly interfaced with the computer.

What is a pressure transmitter?

The pressure transmitter is a kind of sensor that can feel the pressure and convert the pressure signal according to certain rules. A device or device that outputs a usable unified electrical signal. There is a certain continuous linear function relationship between the output signal of the pressure transmitter and the pressure signal. The transmitter is equipped with a dedicated amplifier circuit, and its unified standard output signal is usually DC: ①4~20mA or 1~5V; ②0~10mA or 0~10V. Some pressure transmitters can interface directly with a computer. Some people mistakenly call the pressure transmitter a pressure sensor.

Different working principles

Pressure sensor working principle

A pressure sensor has a measuring cell that converts (or transduces) the mechanical strain of the pressure applied and converts the force into an electrical signal. Pressure in a pipe, hose, or duct applies force on the measuring cell of a sensor, causing a deflection which is measured by an electrical circuit. This measurement is then converted into a current or voltage output.

Pressure transmitter working principle

To put it simply, pressure transmitters convert the mechanical pressure into analog electrical signal. Pressure measurement is based on capturing the changes in voltage. The pressure on the pressure transmitter acts as a force on the diaphragm – depending on the applied pressure the diaphragm either expands or compresses, and the resistance value changes accordingly. The value is then transmitted as an electrical signal. When a certain change of pressure occurs, pressure transmitters can be used to notify its users that something needs attention.

Different related applications

Pressure sensors

It is mainly used in booster cylinders, superchargers, gas-liquid booster cylinders, gas-liquid boosters, presses, compressors, air-conditioning refrigeration equipment and other fields.

Pressure transmitter

  1. Intelligence: Due to the emergence of integration, some microprocessors can be added to the integrated circuit, so that the transmitter has functions such as automatic compensation, communication, self-diagnosis, and logical judgment.
  2. Integration: Pressure transmitters have been increasingly integrated with other measurement transmitters to form measurement and control systems. Integrated systems increase operational speed and efficiency in process control and factory automation.
  3. Miniaturization: The market demand for small pressure transmitters is increasing. This kind of small pressure transmitters can work in extremely harsh environments, and only requires little maintenance and maintenance. The impact is also very small, and it can be placed in various important organs of the human body to collect data without affecting people’s normal life.

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