Introduction
Pressure measurement is an important process in many industries. It is used to monitor systems and ensure their proper functioning. Pressure transmitters are one of the devices used for measuring pressure. They are commonly used in industries such as oil and gas, chemical, and manufacturing. In this article, I will discuss the four types of pressure transmitters.
Type 1 - Absolute Pressure Transmitter
The absolute pressure transmitter measures pressure relative to absolute zero pressure. It is commonly used in vacuum systems, and it is necessary to take into account the pressure inside and outside the vacuum chamber. It is also used in systems that require highly accurate pressure measurements, such as in medical devices.
Absolute pressure transmitters work by using a reference chamber that is maintained at absolute zero pressure. The pressure outside the chamber is then compared to the reference pressure to determine the absolute pressure.
Type 2 - Gauge Pressure Transmitter
Gauge pressure transmitters measure pressure relative to atmospheric pressure. They are commonly used in systems where pressure is above atmospheric pressure. They are used in many industries, including chemical, petrochemical, and oil and gas. They are also used in pneumatic systems and HVAC controls.
Gauge pressure transmitters work by using a pressure sensing element. The element is exposed to the pressure being measured. The pressure on the sensing element is compared to atmospheric pressure to determine the gauge pressure.
Type 3 - Differential Pressure Transmitter
Differential pressure transmitters measure the difference in pressure between two points. They are commonly used to measure flow rate, level, and pressure drop across a filter or valve. They are used in many industries, including chemical, petrochemical, and oil and gas.
Differential pressure transmitters work by measuring the pressure difference between two ports. The difference in pressure is compared to a reference pressure to determine the differential pressure.
Type 4 - Sealed Pressure Transmitter
Sealed pressure transmitters measure pressure relative to a sealed reference pressure. They are commonly used in applications where the media being measured is not compatible with the environment. For example, in the food and pharmaceutical industries, it is necessary to prevent contamination of the media being measured.
Sealed pressure transmitters work by using a pressure sensing element that is sealed with a reference chamber. The reference chamber is filled with a fluid that does not react with the media being measured. The pressure on the sensing element is then compared to the reference pressure to determine the pressure being measured.
Conclusion
In conclusion, pressure measurement is an important process in many industries. Pressure transmitters are one of the devices used for measuring pressure. There are four types of pressure transmitters: absolute pressure transmitter, gauge pressure transmitter, differential pressure transmitter, and sealed pressure transmitter. Each type has its unique features and is suitable for different applications. It is essential to choose the right pressure transmitter for the specific application to ensure accurate and reliable measurements.