Mobile Navigation

Chemical Engineering

View Comments

Two pressure transmitters at the same measuring point

| By Mary Page Bailey and Gerald Ondrey

For a pharmaceutical manufacturer, this company developed a customized product to measure significantly varying pressures from a single measuring point. The solution was to use two pressure transmitters from the Pascal CV3 series, each covering different measuring ranges and both mounted on the same diaphragm seal (photo). Depending on the stage of the production process and the filling level of the tank, the system can switch from a wider measuring range of up to 4 bars to a finer measuring range of up to 400 mbars. The smaller measuring range is overload-protected and the sensor disregards the higher pressures. In order to achieve such high levels of measuring accuracy under widely fluctuating temperatures, the diaphragm seal is further equipped with a patented low-temperature-coefficient diaphragm, which compensates for any temperature-related expansion of the seal’s transmission fluid. This increases measurement accuracy by up to 70%, compared to conventional sinusoidal diaphragms. — Labom Mess- und Regeltechnik GmbH, Hude, Germany