SOP for Operation and Calibration of Brookfield Viscometer | calibration of brookfield viscometer

1.1 To lay down the procedure for BROOKFIELD VISCOMETER operation.

2.0 SCOPE:

This procedure applies to Quality Control Department.


3.1 QC chemists to prepare and follow the SOP.

3.2 Head – QA & QC for implementation of SOP.


Check the spirit level of the viscometer every time before use. The level is adjusted by using the two leveling screws on the base. Adjust so that the spirit level on top of the instrument is centered within the circle.

4.1 Ensure the calibration status is valid and turn the power switch located on the rear panel to the ‘ON’ position.

4.2 This will result in different screen displays and after a few seconds, the screen displays REMOVE SPINDLE, PRESS ANY KEY.

4.3 After removing the spindle ( if attached to it ) and pressing any key, the instrument begins its auto zero. The screen will blink “AUTOZEROING”.


Note: Be sure that the viscometer is leveled before this operation.

4.4 After a few seconds, the blinking stops, and the following is displayed REPLACE SPINDLE, PRESS ANY KEY, pressing any key at this point result is in the display of the instrument default screen.

4.5 Connect the selected spindle to the viscometer by screwing them to the lower shaft. The lower shaft should be behold in one hand and lifted up and the spindle should be screwed to the left.

4.6 Spindles are identified by the number on the side of the spindle nut.

4.7 The two-digit entry code for the selected spindle should be entered by pressing the SELECT SPINDLE key, on pressing it once, the top line of the display will begin to blink.

4.8 Then press the UP or DOWN arrow keys for increasing or decreasing the number which is to the right of the ‘S’ character while ‘S’ is blinking, until the requirement spindle value is displayed.

4.9 The two-digit entry code for each spindle is given below.


4.10 Then press the SELECT SPINDLE key once again after selecting the desired spindle code. This will cause the ‘S’ character to cease blinking and the new spindle code will be displayed and accepted for use.

4.11 Then select the speed for the spindle by first pressing either the UP or DOWN arrow keys, which will cause the area to the right of RPM (on the bottom line) to display the currently selected speed. If the arrow key is pressed just once and then released, the character's RPM will blink for a few seconds and then will cease blinking, resulting in no change to the speed entry.

brookfield viscometer

4.12 Press the UP or DOWN arrow key until the desired speed is displayed and then release it.

4.13 Then press the AUTO RANGE key, which displays the maximum calculated viscosity (full-scale reading) which can be measured with the current spindle/speed setting.

4.14 If the viscosity of the test fluid is greater than 
the AUTO RANGE displayed, then “ cP EEEE” and ‘%EEEE’ will be displayed when operated with this test fluid.

4.15 Change either the spindle or speed to achieve maximum accuracy with the auto range.

4.16 Pressing and holding the AUTO RANGE key during power-on will enable the viscosity display to the read cPs or m.pas. 1 cPs = 1milli pascal.

4.17 Insert and center spindle in the test material until the fluid level is at the immersion groove in the spindle shaft. Press the MOTOR ON / OFF key once to turn the motor ON.

4.18 Allow time for the indicated reading to stabilize. For maximum accuracy, readings below 10% torque must not be taken.

4.19 Press the MOTOR ON / OFF key once again to turn the motor OFF when changing a spindle/speed or changing samples.

4.20 Remove the spindle before cleaning and clean it after use.


            SOP: Standard Operating Procedure

            QA:  Quality Assurance

            QC:  Quality Control           


Determination of viscosity of semisolid by using Brookfield Viscometer


a). LV Brookfield Viscometer.

The LV Brookfield viscometer is dial reading (analog) type. It is supplied with spindles suitable for most applications within the viscosity range of the instrument.

The Brookfield viscometer is of the rotational variety. It measures the torque required to rotate an immersed spindle in a fluid. The spindle is driven by a synchronous motor through a calibrated spring; the deflection of the spring is indicated by the pointer and dial.

For a given spindle geometry and speed, an increase in viscosity will be indicated by an increase in the deflection of the spring.

When performing a test according to an existing specification or procedure using the spindle and speed specified. 

When conducting an original test, the best method for spindle and speed selection is trial & error. The goal is to obtain a viscometer dial reading between 10 and 100 remembering that accuracy improves as the reading approaches 100.

When the reading is over 100, select a slower speed and /or a smaller spindle. Conversely, if the reading is under 10, select a higher speed and/or a larger spindle. If the approximate viscosity of the sample fluid is known, a faster method for homing in on the right spindle/speed combination is available by referring to the factor finder supplied with the viscometer.

b). 500 ml Beaker.

c). Thermometer

Brookfield Viscometer

Procedure for Viscosity Testing 

a). Take the sample fluid in a beaker and remove any entrapped air by gently tapping the container on the tabletop. The sample should be at a constant and uniform temperature. Be sure to bring the sample and spindle to the same temperature before taking a viscosity reading.

b). Connect the required spindle in the viscometer. Immerse the spindle in the fluid taken in the beaker up to the middle of the indentation in the shaft. Switch on the viscometer to start rotation and allow it to run until a constant reading is obtained.

c). Once a valid reading is obtained; multiply it by the spindle factor for the spindle/speed combination used to get the viscosity in centipoises.

Viscosity, cps = x f at -------------ºC


x = Dial reading.

f = Spindle factor.

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