Frequently Asked Questions - All FAQ

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FAQ - All FAQ

There are many reasons to get an automated process viscometer. Some are:> >

  • to reduce the number of laboratory measurements,>
  • to have real-time feedback regarding product evolution or stability,>
  • to optimize process control,>
  • to control product quality,>
  • to verify the quality of purchased goods.> >
  • >Mainly 2 things:> > >robustness to avoid unnecessary maintenance and downtime> >repeatability to get timely and reliable information> > >Other parameters:> > >mountable in any position (directly on reactors or pipes, in tank, on bypass loop, etc.)> >compatible with process conditions (temperature, pressure, corrosion, clogging, etc.)> >safety compliant (FM, ATEX, 3A, PED, etc.)> >instantaneous measurement> >automated functioning> >

    In 1981, Sofraser patented the first viscometer maintained in vibration at its resonance frequency.
    More than 30 years later, we still use this technology because it has been proven to be the best for process viscosity measurement.>

    >It is the natural vibration frequency of a mechanical system (like a diapason). The resonance frequency allows a system to oscillate with the the greatest amplitude of a vibration. In our system, the amplitude of the vibrating rod is about 0.1 mm.>

    No. The viscometer vibrating at resonance frequency is not affected by external vibrations and disturbances.>

    The vibrating technology provides a relative measure. The calibration is realized by correlation to certified mineral oils. By measuring the vibration amplitude in various mineral oils, the linearization parameters are deduced and programmed in the electronics.>

    In normal working conditions, the parameters will not change once they are entered in the electronics. This is due to a specific mechanical design, a thermal treatment, and precise assembly.>

    Installation is not difficult. Once the sensor is installed on an empty pipe (no fluid present), the first and most important thing is offsetting the electronics (zero in the air).  This is a simple procedure that involves pushing a few buttons; detailed instructions are in the User Manual. Any time the sensor is removed and re-installed, the offset must be performed. >

    No special maintenance is required on the sensors. When cleaning the process, leave the viscometer in place. The motion of the vibrating rod combined with the cleansing solution washes the sensor. >

    You can check calibration by measuring a lab referenced Newtonian fluid (silicon or certified mineral oils) for which viscosity at room temperature is know. Re-calibration, using certified mineral oils, of the instrument can be done at our factory in France or at our Houston office.>

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    "It is Sofraser’s mission to build and maintain strong partnerships with our global network, our key accounts and OEM customers.

    Long-lasting products, on-going support, and satisfied customers are direct results of our qualified and knowledgeable group of sales representatives."

    Jean-Marie DUBOYS,
    OEM & KA Manager