Tank overflow protection system and method

摘要

A tank overflow protection system and method for measuring process temperature and pressure utilizing one or more piezoresistive pressure transmitters. The piezoresistive pressure transmitter includes a differential pressure sensor and a temperature sensor. Data from the piezoresistive pressure transmitters can be digitally communicated via a cable. The pressure transmitters convert signals indicative of temperature and pressure to a digital value and transmit the signals to a main processor printed wire assembly for final compensation, diagnostics, and transmission to a distributed control system. A differential pressure can be calculated by subtracting two digital pressure measurement values. The temperature measurement can be employed to calculate any changes in density for a user-defined reference value.

主权项

1. An overflow protection system for a storage tank, said system comprising:
a plurality of piezoresistive pressure transmitters, wherein each piezoresistive pressure transmitter among said plurality of piezoresistive pressure transmitters includes a differential pressure sensor and a temperature sensor; an electronic cable for digitally and electrically communicating data to and from said plurality of piezoresistive pressure transmitters, said plurality of piezoresistive pressure transmitters capable of being connected to a top measurement point and a bottom measurement point of said storage tank to measure process temperature and pressure data; and a processor printed wire assembly for receiving a digital signal indicative of said process temperature and pressure data from said plurality of piezoresistive pressure transmitters for at least one of compensation, diagnostics, and transmission to a distributed control system, wherein said processor printed wire assembly calculates differential pressure data by subtracting at least two digital pressure measurement value outputs from said differential pressure sensor.