How Does a rotational viscometer work

Rotational viscometers work by getting the measurements of the torque on a vertical stand that moves the spindle in a rotational direction. The rotation of the spindle is usually proportional to how viscous the sample is.

Introduction

Rotational viscometers work by getting the measurements of the torque on a vertical stand that moves the spindle in a rotational direction. The rotation of the spindle is usually proportional to how viscous the sample is.

What is the Use?

Rotational viscometers are used to measure viscosity. It is common to find most rotational viscometers looking the same, however, two unique and different set-ups are used when measuring viscosity using the rotational viscometer.

Spring systems

In this set-up, the system mainly uses a spring. The spring is used to measure the torque strength on the spindle. The springs in this system are always marked and calibrated to make it easy to note and read the measurements. Usually, about three to four spring ranges exist. Of importance to note here is that, each particular range is directly related to a particular strength of viscosity. 

Servo Systems

Servo system is the second system that can be used to measure the torque. This system mostly relies on a servo motor. The precision servo motor is used to move the shaft. In this system, the spindle is usually connected directly to the shaft. This is unlike in the spring system in which the spindle is connected to the pivot.

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How does a rotational viscometer work?

Rotational viscometers work by getting the measurements of the torque on a vertical stand that moves the spindle in a rotational direction. The rotation of the spindle […]

Advantage & Disadvantage

Important advantage of the servo systems to note is that, it offers much great ranges for the measurement of torque and speed. Another very important factor to note about the servo system is that, this set up, unlike the spring set up which require frequent and constant re-checking of the calibrations and markings, the servo system can actually stay for a very long time without requiring re-marking and re-checking.

The main disadvantage of the servo system is that; more friction is experienced in this set up than in the spring set up. This means that the accuracy, especially in low speeds is highly reduced and also the accuracy for low viscosity is less than that of the spring set up.

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