Pressure Sensor VS Pressure Transmitter, What are the Differences?

Introduction

Pressure sensors and transmitters are crucial elements in diverse industrial applications for measuring and monitoring pressure. A pressure sensor is a device that measures the pressure of a fluid or gas and converts it into an electrical signal. On the other hand, a pressure transmitter takes the output from a pressure sensor and converts it into a standard signal that can be transmitted over a long distance and used by control systems.

Although they may seem similar at first glance, there are distinct differences between pressure sensors and pressure transmitters. Pressure sensors are typically designed to measure pressure at a specific location and provide a local indication or output. They may be used in applications where direct measurement of pressure is required, such as in industrial processes, automotive systems, or medical devices.

In contrast, pressure transmitters are more complex devices that are designed to transmit pressure information over a long distance. They often include additional features such as signal conditioning, amplification, and calibration to ensure accurate and reliable transmission of pressure data. Pressure transmitters are commonly used in applications where remote monitoring and control of pressure is required, such as in oil and gas pipelines, power plants, or water treatment facilities.

Pressure Sensors

Definition and Function

Types of Pressure Sensors

Working Principle

Pressure sensors deployed in monitoring regions form wireless sensor networks through self-organizing ways. They use elements like silicon and are often arranged in a way that allows for accurate measurement. For example, elements are placed in monitoring areas to detect pressure changes, and when the sensing element inside the pressure sensor is subjected to pressure, a Wheatstone bridge is formed, and the output will be millivolt signal. The output from these sensors can be used for various purposes depending on the application.

Pressure Transmitters

Definition and Function 

A pressure transmitter is a device that converts the output signal of sensors into a recognizable signal for controllers or converts non-electrical signals into electrical signals for remote measurement and control. For example, pressure transmitters are often used in industrial applications where accurate and reliable transmission of pressure data is crucial. They play a vital role in ensuring the smooth operation of processes such as oil and gas pipelines, power plants, and water treatment facilities.

Conversion Process

Pressure transmitters convert non-standard electrical signals into standard ones, such as 0-20mA or 4-20mA signals. This conversion process allows for seamless integration with control systems and enables remote monitoring and control. As seen in various applications, such as the design of a low power consumption wireless pressure transmitter or a leak detection and positioning system of an oil pipeline based on dynamic pressure transmitter, the conversion to standard signals is essential for accurate and efficient operation. Transmitters like these take the pressure information from sensors and transform it into a form that can be easily understood and utilized by different systems.

Differences between Pressure Sensors and Transmitters

Core Distinctions

The main differences between pressure sensors and transmitters lie in their functions of "transformation" and "transmission". Pressure sensors primarily convert non-electrical quantities, such as pressure, into electrical signals. They are responsible for detecting and transforming the physical pressure into an electrical output. For example, a pressure sensor might use a silicon element to sense pressure changes and generate an electrical signal proportional to the applied pressure.

Signal Output

Pressure sensors may output non-standard signals with dimensional units. These signals are often specific to the type of sensor and its measurement range. For instance, a certain type of pressure sensor might output a signal in units of pounds per square inch (psi) or kilopascals (kPa).

In contrast, pressure transmitters output standard signals without dimensional units. Commonly, they output signals such as 0-20mA or 4-20mA, which are easily recognizable and can be integrated into various control systems. These standard signals allow for seamless communication between different components of an industrial process and ensure accurate and reliable transmission of pressure data.

Conclusion

Summary of Differences

Importance in Industries