Differential pressure (dp) measurement is widely used to measure level in pressurized and vacuum tanks. However, traditional dp measurement using impulse lines and capillaries has its drawbacks in terms of accuracy and total cost of ownership.
The problems often encountered with conventional dp systems that use impulse lines include clogging, icing, leaks and condensation. Even those dp systems that use oil-filled capillaries face issues in applications with changing ambient temperatures. Electronic dp Deltabar FMD71 and FMD72 eliminate these problems - you not only benefit from precise measured values but also increased reliability and safety in your process.
Endress+Hauser's electronic differential pressure system, consisting of one transmitter with two sensors, offers proven pressure sensor technology in a new and innovative manner. The transmitter calculates the differential pressure from both sensors and transmits the level, volume or mass via 4...20 mA/HART as a standard 2-wire loop-powered device. This increases reliability and safety and reduces costs.
The system's modular design ensures that repair costs and downtime are drastically reduced. Individual components can be replaced separately, significantly reducing maintenance costs and ensuring maximum plant availability. It's also easy to retrofit the FMD71 and FMD72 into existing mechanical systems, using the same transmitter mounting position.
Additional measurement parameters are available via HART, enabling you to improve your process control. Besides differential pressure and level it is also possible to get the process pressure information as well as the sensor temperature. This valuable information can not only help with maintenance but also improves safety, for example, by avoiding overpressure.
The electronic dp systems allow you to select the ideal process connections, housing and measuring cells based on your application needs. The Ceraphire ceramic cell (FMD71) is absolutely vacuum-resistant and best suited to corrosive and abrasive media. Based on capacitive sensor technology, the Ceraphire ceramic cell offers additional safety with its self-monitoring function. The silicon cell on the FMD72 offers fast-acting temperature compensation for consistently accurate measurement – even in applications with rapidly changing temperatures!
The system is designed to provide increased process safety in the oil & gas, chemical and food & beverage industries. Safety risks are minimized with the new electronic differential pressure system architecture and design as it eliminates of tubing and connection leaks often encountered in traditional systems, and gets rid of line condensation or evaporation events (dry/wet leg inconsistencies) and plugging events.