The Model 9299 Absolute Pressure Tank Level System (APTLS) uses absolute pressure transducers, along with Prime Technology’s new Smart Tank Level Indicating equipment, to measure tank fluid levels. The advantages of this system over other architectures is its, simplicity, reliability, reduced maintenance, and reduced life cycle costs. The system’s design is such that it can be used in a vented or a pressurized tank.

 

The simplicity is that the sensing of the tank’s fluid level consists of two absolute pressure transducers. The transducers can be mounted in or external to the tank. The combined MTBF for the transducers is >250,000 hours, which is an improvement over past architectures. This increase in reliability reduces frequency of the tank sensor’s preventative maintenance.

 

The Pressure Tank Level System utilizes two absolute pressure transducers to measure the fluid in the tank (reference figure 1). One transducer is mounted at the top of the tank and measures the pressure being exerted on the fluid column by the atmospheric pressure, and the other transducer is mounted at the bottom and measures the pressure of the fluid column and the atmospheric pressure. The tank level is proportional to the fluid pressure. The fluid pressure is obtained by taking the difference between the two transducers.