Precise oil viscosity measurement

The VLO-M2 viscosity sensor from TrueDyne Sensors AG is a microelectromechanical system (MEMS) that measures the viscosity of fluids with great precision. The sensor uses an omega-shaped microchannel to route the medium via a pressure gradient to the omega chip. The vibronic measuring system generates the measured values ​​by setting a silicon tube in the chip into resonant vibration and analysing it. This enables high-precision measurement results that are available immediately, allowing for continuous measurement during ongoing processes.

The VLO-M2 viscosity sensor compensates for the effect of temperature on the medium's viscosity and density by recording the temperature of the medium in real-time on the chip. The sensor's MEMS system is only 30 x 80 x 15 mm³, allowing it to fit in tight spaces and is ATEX Zone0/1 certified. The sensor can be used for a variety of applications, including monitoring fuel concentrations in engines.

The sensor's density measurements range from 0 to 1600 kg/m3 at a flow rate of 0 to 10 l/h. The VLO-M2 viscosity sensor sends the measurement data to the readout system via the data line in Modbus RTU transmission mode. The sensor has a high measuring accuracy of ±0.2 mPa s + 5% of reading for viscosity and ±0.2 kg/m³ for density, with a repeatability of ±0.1 mPas for viscosity and ±0.1 kg/m³ for density.