The primary limitation of thermal liquid flow devices is that they rely on K-factor corrections when flowing fluids other than that which they were calibrated for.
These instruments are excellent choices when you need a high-accuracy flow rate for a low pressure drop application. Because of this, the devices are preloaded with tables containing fluid properties. The differential is measured by sensors inside the flow body, and the flow calculation also relies on temperature-dependent fluid properties. Thermal liquid flow meters and controllers typically calculate flow by measuring resistance changes across two heaters in an electrical bridge arrangement. These features make Coriolis an excellent choice for high accuracy low-flow liquid applications. The primary limitation is that flow must be single-phase and cannot have high viscosity.
A single Coriolis unit can be used for either liquid or gas (often including corrosive/aggressive fluids) – and most don’t even require an annual calibration. Another noteworthy benefit of Coriolis technology is extensive material compatibility. These devices provide repeatable, high accuracy mass flow and density measurements even when the percent composition of your liquid is unknown or changing. For a thorough explanation of the Coriolis operating principle, read here. The Coriolis instrument does this by calculating mass from flow-induced vibrational changes and then converting that into a flow rate and fluid density. Here we analyze some of the most popular low-flow liquid flow solutions and evaluate use cases of each.Ĭoriolis flow meters and controllers measure mass flow directly and independently of fluid properties – with the added bonus of measuring density.
There is a wide range of flow technologies available for measurement and control in low-flow liquid applications, from mass flow and differential pressure to velocity flow and positive displacement. Flow instruments for low-flow liquid applications
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