Several pressure transmitter manufacturers have their own system where differential pressure is measured with two pressure transmitters electronically connected. The names are different per transmitter manufacturer. Rosemount has the ERS™ system 3051SAM, Yokogawa calls it the DRS pressure system EJC40A, and Endress and Hauser has the Electronic Dp FMD72. All of them work on the “Master” and “Slave” principle. Both pressure transmitter are registering the process pressure, where the High pressure sensor (HP) measures the hydrostatic pressure and the Low pressure sensor (LP) measures the head pressure. The differential pressure (DP) is calculated by using these two digital values. There are a few advantages why to use this system in favor compared to the traditional Dp pressure transmitters. In most cases the advantages start to count when the height differences between nozzles is big (Eg: 20 mtr). With capillary systems with these capillary length the mounting effect or ambient temperature fluctuations can lead to unacceptable inaccuracies.
Badotherm can mount diaphragm seals to all three systems and is able to perform the required validations on the system. This leads to a reliable instrument in both the gauge pressure values as the electronic output of the Dp signal.