The underground tank monitoring system uses a level sensor mounted in the tank turret via the standard eight hole flange used by the magnetic drive units.
Mounted in the electrical enclosure of the level sensor is a programmable transmitter that provides a linearised 4 to 20 mA output to the indicators. In the fill box a field mount indicator is installed which can provide power to the indicator loop.
Additional indicators can be installed on the system typically at the operator's console position. The system was designed to be cost-effective while, at the same time, being reasonably accurate and simple to install and maintain.
Accuracy is dependent on the shape of the tank and the actual liquid level. For a horizontal bullet tank the incremental level variation is greatest in the centre and the typical worst case on a 17.4 kl tank is an accuracy of about +1%, but improves towards the top or bottom.
The system for the above ground tanks is similar to the underground system but it uses a simpler sensor which is designed to fit the standard four hole flange pattern for a top mounted contents gauge.
The programmable transmitter can be installed within the stainless steel electrical housing mounted on top of the level sensor or in the enlarged Bintech indicator.
The basic system may be further enhanced by connection of the 4 to 20 mA output to a telemetry system enabling the tank contents to be read remotely on a host computer. The Bintech Product Notes provide detailed specifications of the sensors and indicator.