Pressure transducers that are tight without a seal

The new series AFRISO DMU 02 pressure transducers are based on a polysilicon thin film measuring cell, a new technology in industrial pressure measurement. The semiconductor bridge circuit is attached to an isolated stainless steel diaphragm. This measuring technology combines all the positive characteristics of conventional pressure sensors such as a high output signal, excellent dynamic behaviour, high long-term stability; in addition, it is resistant to vibrations and offers a high burst strength. Seals are not required since the measuring cell is directly welded to the process connection. In the case of open process connection versions, no hydraulic transfer medium is required so that DMU 02 Vario is the perfect solution for oil- and grease-free applications, pharmaceutical air, gas and ultra-pure gas measurements. If flush pressure connections are required in the process, a second diaphragm is mounted in front of the measuring cell. The Vario diaphragm systems are filled with special transfer liquids and also hermetically sealed by means of welding. The possibility of diffusion of the transfer liquid out of the system or of the measured medium into the system is excluded. The series DMU 02 Vario pressure transducers feature stainless steel housings and connections; they are available for the ranges -1/0 bar and 0/250 mbar up to 0/2000 bar. The pressure transducers are supplied with 12 to 32 V DC, they are suitable for temperatures of the measured medium from -40 to 125 °C and they supply 4-20 mA or 0-10 V output signals. Other electrical connections or output signals as well as customer-specific and industry-specific process connections are available as options. Typical application areas of the pressure transducers include engineering, process technology, food and pharmaceutical industries as well as ultra-pure gas applications.