The Spriano transmitter series SS170 measures liquid levels, density and interface levels in open or closed tanks. It converts the hydrostatic thrust exerted by a displacer immersed in a liquid into a current signal proportional to the measured level by means of a mechanical force transmission system based on a torsion tube and a piezoresistive sensor.
The series is available in standard materials (Carbon Steels, Stainless Steels AISI 316 & 321) as well as in special alloys (Hastelloy C, Duplex, Titanium, Inconel, etc.) always conforming to the latest NACE requirements. The best measurement resolution is obtained at nominal density conditions.
This implies that by reducing the measuring range, the output resolution Ru% varies according to the following equation: Ru% = 0.01 x 0.75 x 1.42 / (measuring range).
The nominal accuracy is less than ±0.5% including non-linearity, repeatability and hysteresis errors. The standard operating temperature of the process medium ranges from -60/+200°C, and with the finned extension arm can work above 200°C and up to 450°C.
A high-tech measuring solution
The Spriano torsion rod level transmitter represents an excellent technology available on the market in the area of measuring technologies that exploit Archimedes’ principle, i.e. that principle according to which every body immersed in a fluid (liquid or gas) undergoes a force directed from the bottom upwards of an intensity comparable to the force-weight of the displaced fluid.
There are considerable advantages when this technology is compared to similar principles such as LVDT or ‘spring type’. In fact, the torsion bar principle allows the measuring chamber to be adapted to any type of process connection, including Top-Side or Top-Bottom solutions, in addition to Top-mounting (at the top of the tank).