System for remote measurement of a tank level, especially a tank containing liquefied hydrocarbons

摘要

The system of the invention comprises an intrinsically-safe gauge 110, arranged in the vicinity of the tank, suitable for delivering a level signal representing the level present in the tank; means 114 for digitising this level signal; means for parallel loading, at least for this digitised signal SN, a shift register 171; means for serial reading of this shift register and for remotely transmitting the contents; means 410 for receiving the signal thus transmitted; means for restoring and displaying 420, from the received signal, an item of information representing the digitised signals loaded into the shift register. Pulse code modulation allows a transmission employing very weak currents, in accordance with the requirement for intrinsic safety. The message transmitted may also comprise information on pressure, temperature, reports of alarms and other information derived and centralised at the measurement point. IMAGE