Druktransducers

Druktransducers, often referred to in English as pressure transducers, are devices that convert a pressure input into an electrical signal. They typically combine a sensing element with signal conditioning and an electrical interface, enabling the pressure to be measured, displayed, stored, or used to control a process. The term can be used for various sensing technologies.

Principle and sensing elements: Most druktransducers use a diaphragm with a sensing element such as a bonded strain gauge, a capacitive cell, a piezoelectric crystal, or a resonant element. When pressure is applied, the element's dimension or electrical property changes, producing an output that is proportional to the applied pressure. The technology chosen influences sensitivity, temperature stability, and long-term drift.

Outputs and interfaces: Common electrical outputs include millivolts per volt (mV/V) for strain-gauge types, 4-20 mA current loops, or 0-10 V/0-5 V voltage signals. Digital variants provide data via I2C, SPI, Modbus, CAN, or other industrial protocols. Many devices include built-in amplification, linearization, and temperature compensation.

Types and ranges: Pressure measurements may be gauge (relative to atmospheric), absolute (relative to a vacuum), or differential (between two ports). Ranges span from sub-psi to hundreds of thousands of psi, with performance classes defined by accuracy, repeatability, and temperature range. Safety and media compatibility are important for hostile environments.

Applications and considerations: Druktransducers are widely used in process automation, automotive testing, aerospace, energy, HVAC, medical devices, and laboratory equipment. Selection factors include measurement range, accuracy class, response time, temperature range, media compatibility, and electrical interface. Calibration and maintenance ensure traceability and reliability.

See also: Pressure sensor; transducer; sensing element. Standards and compliance often involve CE marking, RoHS, and industry-specific norms.