tryktransmittere

tryktransmittere are devices used in industrial instrumentation to convert pressure measurements into an electrical signal for process control. They provide a calibrated signal that can be transmitted over cables to control systems, recorders, or safety systems. The term generally refers to instruments that measure gauge, absolute, or differential pressure and translate it into standardized outputs.

Most transmitters use a sensing element such as a piezoresistive silicon diaphragm or a capacitive element. The applied process pressure deflects the diaphragm, producing a change in the sensing element's electrical properties, which is then amplified and conditioned by electronics to deliver a stable output. Common outputs include 4-20 mA current loops, 0-10 V voltage, or digital communication protocols such as HART, FOUNDATION Fieldbus, or Profibus. Some units also provide localized displays or diagnostic information.

Construction typically includes a process connection, a protective housing, a wetted sensor assembly, signal conditioning electronics, and an electrical connection. They may be ruggedized for harsh environments and offered with explosion protection (ATEX/IECEx) and various ingress protection ratings. Temperature compensation and calibration are important for accuracy and stability; common accuracy classes range from around 0.25% to 0.5% of full scale, with higher performance options available.

Applications span chemical processing, oil and gas, water and wastewater, power generation, and HVAC systems. When selecting a pressure transmitter, one considers pressure range, type of pressure (gauge/absolute/differential), accuracy, temperature range, chemical compatibility of wetted materials, response time, output protocol, and environmental protection. Regular calibration and maintenance ensure long-term reliability.