Full definition
A pressure transmitter is an electronic device that converts pressure measurements into a proportional electrical signal, commonly found in industrial applications. The two primary output formats for these signals are the 4-20 mA current loop, which is widely used due to its robustness against electrical noise, and the 0-10V voltage output, which is suitable for short distances and lower power applications. Pressure transmitters utilize various measurement principles to achieve accurate readings, with the piezoresistive method—employing a silicon cell—being the most prevalent due to its cost-effectiveness and reliability. Other methods include capacitive pressure sensing, known for its high stability, and thin-film technology, which excels in high-temperature environments.
The performance of a pressure transmitter is often characterized by its accuracy, typically ranging from ±0.1% to ±0.5% of the full scale (FS), depending on the specific model and application. These devices can measure a wide range of pressure, from as low as 0-1 bar to as high as 0-1,600 bar, accommodating various industrial needs. Additionally, they are designed to operate in extreme temperature conditions, with a range from -40°C to +125°C, making them suitable for use in harsh environments.
Pressure transmitters comply with industry standards, such as IEC 61298, which outlines the performance requirements and testing methods for these devices. Many pressure transmitters also feature high protection ratings, such as IP67 or IP68, ensuring their durability and reliability in wet or dusty conditions. Various manufacturers, including Wika, Keller, Parker, Endress+Hauser, and Siemens, produce these devices, providing a variety of options to meet diverse industrial specifications.