SOP Title: Operation, Cleaning and Calibration of Digital Viscometer
- Objective:
To lay down the procedure for Operation, Cleaning and Calibration of Digital Viscometer.
- Scope:
This SOP is applicable for Operation, Cleaning and Calibration of Digital Viscometer located in Quality Control Laboratory.
- Responsibility:
- Quality Control: To prepare and review the SOP. To follow the procedures laid down for operation, cleaning and calibration of Digital Viscometer as per this SOP.
- Quality Assurance Department: To review and approve the SOP and Annexures.
- Accountability:
Head Quality Control Department, Head Quality Assurance Department.
- Procedure:
| 5.1 | Safety Precautions/Instructions: | |||
| 5.1.1 | Ensure all the electrical connections are properly earthed. Ensure the power plug of the Digital Viscometer is fixed in the socket properly. | |||
| 5.1.2 | Wear personal protective equipment’s such as safety glasses, hand gloves during operation of instrument. | |||
| 5.1.3 | Turn the power switch to the ON position and allow the viscometer to warm up for 10 minutes before performing auto zero. | |||
| 5.1.4 | The user should ensure that the substance placed under test do not release poisonous, toxic or flammable gases at the temperature which they are subjected to during the testing. | |||
| 5.2 | Instrument Operation: | |||
| 5.2.1 | Introduction to the front screen of Digital Viscometer: | |||
| 5.2.3 |
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| 5.3 | Operation of Digital Viscometer: | |||
| 5.3.1 | Check the validity of calibration before starting any operations. | |||
| 5.3.2 | Ensure that the instrument should be cleaned before operation. | |||
| 5.3.3 | Connect the power cord to 230 VAC/50 Hz stabilized power supply. | |||
| 5.3.4 | Switch ON the mains of Digital Viscometer. | |||
| 5.3.5 | Allow 10 minutes warm up time before operation of Digital Viscometer. | |||
| 5.3.6 | After instrument is powered “ON”. The Viscometer Present Blue screen followed by auto zero screen. Remove the shipping cap before auto zero. | |||
| 5.3.7 | AUTO ZERO: | |||
| 5.3.8 | The Auto Zero should be perform for Viscometer before taking viscosity measurement. | |||
| 5.3.9 | The auto zero shall be performed every time the instrument is turned ON. | |||
| 5.3.10 | The operator must ensure that the viscometer is in level by observing bubble in centre position and should remove any attached spindle before performing auto zero. | |||
| 5.3.11 | Press “Next” option from screen to performed Auto Zero. | |||
| 5.3.12 | After the auto Zero is complete, Press “Next” option from screen to Configure Viscosity Test screen. | |||
| 5.3.13 | After the auto Zero is complete, go for Oscillation Check before performing analysis of sample. | |||
| Note: Do not touch the viscometer during the Auto zero process to ensure the best zero value. | ||||
| HOME SCREEN: | ||||
| 5.3.14 | The Home screen can be accessed by using the Home Icon | |||
| 5.3.15 | The Home screen shows the Main Menu functions and provides access to
User Log In and Settings |
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| 5.3.16 | Configure Viscosity Test |
Create and Run viscosity tests. |
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Load Test |
Load a test that has previously been saved or created with PG Flash software. Tests may be loaded from internal memory or a USB Flash Drive. | |||
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View Results |
Load Results (saved test data) that have previously been saved. Results may be loaded from internal memory or a USB Flash Drive. | |||
| Manage Files | Manage the file system in the internal memory or on a USB Flash Drive for test programs and saved
data. Create new folder structures, delete files, rename files and move files. |
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| External Mode | Direct the instrument to communicate with Brookfield Rheocalc T Software for complete viscometer control through software. | |||
| Configure Viscosity Test : | ||||
| 5.3.17 | The Command Keys include Clear, Save and Run.
CLEAR- Clear all data that has been entered into the test parameters and restore the values to the factory default. SAVE- Save the current test. RUN- Run the current test. |
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| RANGE : | |||||||||||||||||
| 5.3.18 | The Range is also shown in the Running Viscosity Test during the
measurement. Viscosity will be displayed in the unit of measure specified in Settings and is set to centipoise (cP). |
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| 5.3.19 | RANGE | ||||||||||||||||
| 5.3.20 | The Viscometer will calculate the measurement range for a specific Spindle and speed combination. This information is displayed on the screen while selecting the spindle number. | ||||||||||||||||
| OUT OF RANGE : | |||||||||||||||||
| Note: When the %Torque reading exceeds 100% (over range), the display of %Torque, Viscosity, and Shear Stress will be EEEE | |||||||||||||||||
| 5.3.21 | If the %Torque value is between 0 – 9.9%, the data field label will flash. | ||||||||||||||||
| 5.3.22 | When the %Torque is below zero(negative values), the display of Viscosity
and Shear Stress will be —-. |
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| Note: Instrument recommends collecting data only when the % Torque reading is between 10 – 100%. | |||||||||||||||||
| 5.3.23 | The Viscometer will give on screen indications when the measurement is out of range of the instrument and the instrument will display as:
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| Note: Measurement data should not be collected when the %Torque reading is out of range. The out of range condition can be resolved by either changing the speed (reduce speed when reading is out of range: high) or changing the spindle (increase the spindle size when the reading is out of range: low). | |||||||||||||||||
| OPERATION FOR MAKING MEASUREMENT | |||||||||||||||||
| 1 )Viscometer | |||||||||||||||||
| 5.3.24 | The instrument should be turned ON, leveled. | ||||||||||||||||
| 5.3.25 | The level is adjusted using the two feet on the bottom of the base and confirmed using the bubble level on the front of the head of instrument. | ||||||||||||||||
| 5.3.26 | Adjust the feet until the bubble is inside the center target. Set the bubble level priorto auto zero and check the level prior to each measurement. | ||||||||||||||||
| Note: The proper level is essential for correct operation of the Viscometer. | |||||||||||||||||
| 2) Sample | |||||||||||||||||
| 5.3.27 | The fluid to be measured (sample), must be in a container. The standard
spindles supplied are designed to be used with 600 ml beaker or equivalent container with an internal diameter of 8.25 cm/height 12.1cm OR larger container may be used. |
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| 3)Selecting a Spindle/Speed | |||||||||||||||||
| 5.3.28 | If the spindle number and speed is already mentioned for the sample, then put directly in test method and carry out test. | ||||||||||||||||
| 5.3.29 | If not, then the process of selecting a spindle and speed for an unknown fluid is normally trial and error. | ||||||||||||||||
| 4) Spindle Entry code and Range Coefficients | |||||||||||||||||
| 5.3.30 | The range coefficient is a convenient tool for quickly determining the maximum viscosity that can be measured with a specific spindle/speed combination. | ||||||||||||||||
| 5.3.31 | Divide the Range Coefficient by the spindle speed to determine the maximum viscosity in centipoise that can be measured. | ||||||||||||||||
| 5.3.32 | Spindle Entry Code and Range Coefficients:- ( as per operational manual Table )
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| 5.3.33 | E.g. LV Viscometer with LV2 spindle: Range Coefficient is 30,000. At 60 RPM, the maximum viscosity that can be measured is 30,000/60 or 500 cP. | ||||||||||||||||
| 5.3.34 | Two general rules are there in the trial and error process.
1) Viscosity range is inversely proportional to the size of the spindle. 2) Viscosity range is inversely proportional to the rotational speed. |
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| 5.3.35 | Viscometers are provided with a set of four spindles and a narrow guard leg | ||||||||||||||||
| 5.3.36 | The spindles are attached to the viscometer by screwing them onto the coupling nut on the lower shaft. | ||||||||||||||||
| 5.3.37 | Note that the spindles have a left-hand thread. The lower shaft should be secured and slightly lifted with one hand while screwing the spindle to the left. The face of the spindle nut and the matching surface on the lower shaft should be smooth and clean to prevent eccentric rotation of the spindle. | ||||||||||||||||
| Note: To avoid the trapping of air bubble beneath the disc, First immerse the spindle at an angle, and then connect it to the viscometer without taking out spindle from the sample solution. | |||||||||||||||||
| 5.3.38 | Spindles can be identified by the number on the side of the spindle coupling nut as shown in picture: | ||||||||||||||||
| Note: Spindle should dip up to the mark to get accurate reading. | |||||||||||||||||
| 5.3.39 | The repeatability viscosity should control the following parameters:
1) Test temperature 2) Sample container size 3) Viscometer model 4) Sample volume 5)Spindle used 6)Whether or not to attach the guard leg 7) Test speed or speeds 8) Length of time or number of spindle revolutions to record viscosity 9) How the sample was prepared and/or loaded into the container. |
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| 5)Multiple Data Points | |||||||||||||||||
| 5.3.40 | The majority of viscosity and yield stress measurements are made at the quality control level consist of a single data point. Many fluids exhibit a characteristic change in viscosity and stress with a change in applied force. | ||||||||||||||||
| 5.3.41 | Non-Newtonian flow is analyzed through the collection of viscosity data over a range of shear rates and the generation of a graph of viscosity versus shear rate. | ||||||||||||||||
| 5.3.42 | For collecting multiple data points for comprehensive analysis of flow behavior when using test programs created with PG Flash Software. | ||||||||||||||||
| 6) Selecting Data Collection : | |||||||||||||||||
| 5.3.43 | The Data Collection setting is shown in Configure Viscosity Test directly under the Temperature display. Pressing the blue arrow, in this field, will present the Data Collection screen : | ||||||||||||||||
| a ) Single point : | |||||||||||||||||
| 5.3.44 | Collect only a single data point when the End Condition is met. | ||||||||||||||||
| b) Single Point Averaging: | |||||||||||||||||
| 5.3.45 | Specify an amount of time over which to average measured data. Collect a single data point when the End Condition is met. | ||||||||||||||||
| 5.3.46 | Example 1: The End Condition is Time with a value of 1 minute and 30 seconds, the Single Point Averaging Duration is 30 seconds, the single data point collected from this step will be an average of the data measured from 1 minute to 1 minute 30 seconds. | ||||||||||||||||
| c)Multi Point: | |||||||||||||||||
| 5.3.47 | Collect multiple data points based on time. The Data Interval is specified in Hours:Mins:Secs. If the End Condition is set to Time, then the total number of points will be calculated and displayed in the Data Collection screen. | ||||||||||||||||
| 5.3.48 | Example 1: End Condition is Time = 2 minutes, Multi Point Data Interval is 10 seconds. Total points collected will be 12 with the last data point taken in the last second of the step. | ||||||||||||||||
| 5.3.49 | Example 2: End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 10 seconds. During the test the total time required to reach 200 cP is 65 seconds. Total points collected will be 6 with the last data point taken at 60 seconds, 5 seconds before the test is finished. | ||||||||||||||||
| d)Multi point Averaging : | |||||||||||||||||
| 5.3.50 | Specify an amount of time over which to average measured data. Collect
multiple data points based on time until the End Condition is met. |
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| 5.3.51 | Example 1: End Condition is Time = 2 minutes, Multi Point Data Interval is 10 seconds. Averaging Duration is 5 seconds. Total points collected will be 12 with the last data point taken in the last second of the step. Each data point will be an average of the data measured in the last 5 seconds of each Data Interval. | ||||||||||||||||
| 7) End Condition : | |||||||||||||||||
| 5.3.52 | The completion of a test is defined by the End Condition. Each time that you enter Configure Viscosity Test, the End Condition will be set to the last value used. The End Condition parameter or values can be changed by pressing the End Condition button. | ||||||||||||||||
| 5.3.53 | The End Condition can be changed by pressing the blue down arrow
within the parameter field. |
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| 5.3.54 | Six End Conditions are available:
1)Time 2)# of Points 3)# of Revolutions 4)Torque 5)Viscosity 6)Temperature |
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| 1)Time: | |||||||||||||||||
| 5.3.55 | The test will complete when the specified amount of time has elapsed. Time is entered in Hours, Minutes, and Seconds. refer point 5.3.54 | ||||||||||||||||
| 2)# of Points : | |||||||||||||||||
| 5.3.56 | The test will complete when the specified number of data points has been collected. Data is collected according to the Data Collection setting refer point 5.3.57. The range of data points is: 1 – 9,999. | ||||||||||||||||
| 3)# of Revolutions: | |||||||||||||||||
| 5.3.57 | The test will complete when the specified number of revolutions of the
spindle has occurred. Data is collected according to the Data Collection setting refer point 5.3.57. The range for number of revolutions is 1 – 9,999. |
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| 4)Torque: | |||||||||||||||||
| 5.3.58 | The test will complete when the specified Torque value is measured. Data
is collected according to the Data Collection setting refer point 5.3.54. The range of values for the measured Torque is: -10.0 % – 100.0 % |
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| 5)Viscosity: | |||||||||||||||||
| 5.3.59 | The test will complete when the specified Viscosity value is measured. Data is collected according to the Data Collection setting refer point 5.3.54. range of measured Viscosity is 0 – 10,000,000,000 cP. | ||||||||||||||||
| 6)Temperature: | |||||||||||||||||
| 5.3.60 | The test will complete when the specified Temperature value is measured to
within the indicated Tolerance. Temperature is measured through connected temperature probe. |
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| Note: A small tolerance value will require a much longer time to reach the End Condition. | |||||||||||||||||
| Note: Audible alarms may be turned off in the User Settings | |||||||||||||||||
| 9) Running a Test: | |||||||||||||||||
| 5.3.61 | A viscosity test is started by pressing the Run button on the Configure Viscosity Test screen. | ||||||||||||||||
| 5.3.62 | When Run is pressed, the display will change to the Running Viscosity Test screen and the display shows: | ||||||||||||||||
| 5.3.63 | The Running Viscosity Test screen provides information on the current measurement Consist :
1)Torque 2)Viscosity 3)Shear Stress 4)Shear Rate 5)Temperature 6)Speed |
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| 1) Torque: | |||||||||||||||||
| 5.3.64 | It is described as a percent (%) and has a range of 0 – 100%. The instrument provide measurement results within the stated accuracy provided the Torque reading is between 10 and 100%. If the Torque reading falls below 10% the labels in the data fields will flash to indicate an error condition. | ||||||||||||||||
| 2)Viscosity : | |||||||||||||||||
| 5.3.65 | Viscosity is calculated from the measured Torque based on the selected spindle and speed of rotation. | ||||||||||||||||
| 3)Shear Stress: | |||||||||||||||||
| 5.3.66 | Shear Stress is calculated from the measured Torque based on the selected spindle. | ||||||||||||||||
| 4)Shear Rate: | |||||||||||||||||
| 5.3.67 | Shear Rate is calculated from selected speed based on the selected spindle. | ||||||||||||||||
| 5) Temperature | |||||||||||||||||
| 5.3.68 | Temperature is the input value from a connected temperature probe. The provided probe shall be inserted into the test sample to check the temperature. | ||||||||||||||||
| 6) Speed | |||||||||||||||||
| 5.3.69 | Speed is the selected speed from the Configure Viscosity Test screen. | ||||||||||||||||
| 5.3.70 | The More/Less Bar can be used to reduce the number of parameters shown in the display. | ||||||||||||||||
| 5.3.71 | The Speed parameter is active while running a test. The operator can change the speed of test without returning to the Configure Viscosity Test screen. refer point 5.3.71 | ||||||||||||||||
| Note: If the speed is changed during the execution of a saved test, then the test status will be changed to “Unsaved Test”. | |||||||||||||||||
| 7) Results: | |||||||||||||||||
| Return to the Home Menu. | |||||||||||||||||
| 5.3.72 | Each data point includes: Viscosity, Torque, Speed, Temperature, Time, Shear Stress (SS), Shear Rate (SR), Density, and Accuracy. | ||||||
| c)Auto Zero: | |||||||
| 5.3.73 | Auto Zero is an operation performed by the Viscometer automatically during the power up sequence. This operation sets to a correct zero value. | ||||||
| 5.3.74 | Selecting Oscillation Check will present a screen instructing to level the viscometer and remove the spindle. After Confirmation of level will present the Oscillation Check screen as shown below. | ||||||
| 5.3.75 | A successful Oscillation Check will show a very smooth decrease of
%Torque with a final value within +/-0.2 of 0.0. Any value above 0.2 % or below -0.2% indicates that a calibration check should be performed |
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| a)Measurement Units: | |||||||
| 5.3.76 | The Measurement Units menu displays current selections for measurement
units. Each unit can be changed by pressing the down arrow and selecting the desired value. |
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| 5.3.77 | Measurement Units are part of the data file for saved results. Available units include:
1)Viscosity 2) Speed 3) Temperature 4) Stress (Shear) 5) Density |
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| 5.3.78 | 1)Viscosity | ||||||
| cP | Centipoises | ||||||
| P | Poise | ||||||
| mPa•s | milliPascal seconds | ||||||
| Pa•s | Pascal seconds | ||||||
| cSt | Centistokes | ||||||
| mm2/s | millimeters squared per second | ||||||
| Note: When cSt units are chosen for viscosity, a density value must be entered in the Density field in Configure Viscosity Test. | |||||||
| 2) Speed | |||||||
| 5.3.79 | RPM | revolutions per minute | |||||
| 1/s | reciprocal seconds | ||||||
| 3) Temperature | |||||||
| 5.3.80 | C | Centigrade | |||||
| F | Fahrenheit | ||||||
| 4) Stress (Shear) | |||||||
| 5.3.81 | Dyne/cm2 | Dyne per square centimeter | |||||
| N/m2 | Newton / square meter | ||||||
| Pa | Pascal | ||||||
| 5) Density: | |||||||
| 5.3.82 | g/cm3 | gram / cubic centimeter (1gm/cm3) | |||||
| kg/m3 | kilogram / cubic meter (1kg/m3) | ||||||
| Note: Density and viscosity are both sensitive to temperature. When using a density value in Configure Viscosity Test, enter a density value that was
determined at the same temperature as that of the viscosity measurement. |
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| d)Spindle List: | |||||||
| 5.3.83 | The selection of Spindle in Configure Viscosity Test can be done by using either a number pad or a scroll list. | ||||||
| e)Speed List: | |||||||
| 5.3.84 | The selection of Speed in Configure Viscosity Test can be done by using either a number pad or a scroll list. | ||||||
| 5.3.85 | When scroll list is selected, the speed entry is restricted to the speed sets for the LV viscometers. The contents of the scroll list are defined in the Speed List menu. | ||||||
| 5.3.86 | The Brookfield speed sets are defined below | ||||||
| LV | 0.3, 0.6, 1.5, 3, 6, 12, 30, 60 | ||||||
| 2)Users and Access | ||
| 5.3.87 | The instrument can be set up with User accounts to restrict access and enhance data tracking. Two user levels are available in the instrument and each can be customized by the Administrator. | |
| 5.3.88 | All user accounts require a password for access to the instrument. | |
| 5.3.89 | The User Settings are divided into three categories; General Settings, Data Access Functions, and Viscosity Test Setup. | |
| 5.3.90 | The administrator can customize both the Power User and User through the
Power User Level Access and User Level Access in the Users and Access Menu. |
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| 5.4 | Calibration | |
| Frequency: Quarterly calibration | ||
| 5.4.1 | Generate the A. R. No. on the “Instrument/Equipment Calibration Register” as per SOP and give requisition to QA Department for calibration formats of instruments on the due date of calibration. | |
| 5.4.2 | For issuance of calibration report refer SOP “Control of documents, Preparation, Approval, Issuance and Maintenance. | |
| 5.4.3 | Perform the Oscillation Check before Perform the calibration of instrument. Refer point no. 5.3.115 | |
| 5.4.4 | Perform the calibration of instrument as per Annexure and procedure mentioned below. | |
| 5.4.5 | Calibration of Digital Viscometer is performed for below parameters:
1)Temperature Calibration 2) Spindle Calibration By Using Viscosity Standard Fluid |
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| 1)Temperature :- | ||
| 5.4.6 | The instrument should be turned on, leveled. | |
| 5.4.7 | The level is adjusted using the two feet on the bottom of the base and confirmed using the bubble level on the front of the head. | |
| 5.4.8 | Adjust the feet until the bubble is inside the center target. Set the level prior
to auto zero and check the level to each measurement and perform auto zero. |
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| 5.4.9 | Allow 10 minutes warm up time before operation of Digital Viscometer. | |
| 5.4.10 | Temperature data will only be displayed if a Brookfield temperature probe is connected to the Viscometer. | |
| 5.4.11 | The Temperature value is measured to within the indicated Tolerance. Temperature is measured through connected temperature probe. | |
| 5.4.12 | A suitable Viscosity standard fluid is require to perform the calibration performance check. | |
| 5.4.13 | Brookfield Viscosity Standard Fluids having a validity of one year from date of initial use. | |
| 5.4.14 | Viscosity Standard Fluids can be stored under normal Laboratory condition. | |
| Note: 1) For Viscosity Standards < 30,000 cP, use a 600 mL Low Form Griffin Beaker having a working volume of 500 ml.
2) For Viscosity Standards ≥ 30,000 cP, use the fluid container. |
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| 5.4.15 | Pour the viscosity standard fluid into a 600 ml beaker while being careful to not trap any bubbles. | |
| 5.4.16 | Place beaker into a constant temperature Bath set to 25°C | |
| 5.4.17 | Immerse the temperature probe in the liquid for 1 hour | |
| 5.4.18 | After 1 hour, check the temperature of the viscosity standard fluid with a calibrated thermometer. | |
| 5.4.19 | Enter the details in calibration report. Refer Annexure No.:- 01 | |
| 5.4.20 | Ensure that the results obtained, comply with the acceptance criteria. | |
| Acceptance Criteria :- 25.0 ± 0.1°C | ||
| 2) Spindle Calibration By Using Viscosity Standard Fluid :- | ||
| 5.4.21 | A suitable Viscosity standard fluid is require to perform the calibration performance check. | |
| Note: LV #4 (64) spindles have been omitted to perform a calibration check on instrument from procedure.
Reasons that the small amount of spindle surface that makes contact with the viscosity standard, the difficulty of establishing the immersion mark precisely and the need for precise temperature control at 25°C in the immediate range of the spindle. |
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| 5.4.22 | Pour the viscosity standard fluid into a 600 ml beaker while being careful to not trap any bubbles. | |
| 5.4.23 | Place beaker into a constant temperature Bath set to 25°C | |
| 5.4.24 | Connect the spindle No. 61 to the viscometer | |
| 5.4.25 | Lower the viscometer head into position. Be sure to use supplied guard leg. | |
| 5.4.26 | The viscometer Standard fluid, together with the spindle, should be immersed in the bath for a minimum of 1 hour, gently stirring the fluid. | |
| Note: spindle should be immersed in standard fluid up to the mark to get accurate reading. | ||
| 5.4.27 | Enter the details of sample in the instrument such as spindle number, Temperature, RPM, end condition etc. | |
| 5.4.28 | After 1 hour check the temperature. After attaining temperature 25.0°C ±0.1°C. Press the run option from test panel. | |
| Note: The spindle must rotate at least five times before readings are taken. | ||
| 5.4.29 | For spindle No. 61 measure the viscosity using three rotational speeds. Such as 1 RPM, 2 RPM, 4 RPM. | |
| 5.4.30 | Constant values of SMC and TK:-
SMC = Spindle Multiplier Constant ; TK = Torque Constant Calculation of Full Scale viscosity Range (FSR) :-
FSR (cP) = TK * SMC* 10000_ RPM |
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| 5.4.31 | Same procedure to be followed for Spindle no. 63 from point no. 5.4.5 to 5.4.30. For spindle No. 63 .Measure the viscosity using three rotational speeds. Such as 10 RPM, 30 RPM, 60 RPM. | ||||||||||||||||||
| Interpretation of Calibration Test Results: | |||||||||||||||||||
| 5.4.32 | The viscosity reading should equal the cP value on the fluid standard to within the combined accuracy of the viscometer and the viscosity standard. | ||||||||||||||||||
| 5.4.33 | Brookfield Viscosity Standards Fluids are accurate to (+/-) 1% of their stated value. The instrument is accurate to (+/-) 1% of the range when using spindles LV #1-3. | ||||||||||||||||||
| 5.4.34 | Example: Calculate the acceptable range of viscosity using DV2TLV with LV-3 Spindle at 20 RPM Viscosity Standard Fluid 1000 with a viscosity of 1005 cP at 25°C:
1) Calculate full scale viscosity range using the equation: Full Scale Viscosity Range [cP] = TK * SMC * 10,000 RPM Where: TK – 0.09373 from point no 5.4.30 SMC =128 from point no. 5.4.30
Full Scale Viscosity Range = 0.09373* 128 * 10,000 = 6,000 cP 20 The viscosity is accurate to (+/-) 60 cP (which is 1% of 6,000) 2) The viscosity standard fluid is 1005 cP. Its accuracy is (+/-)1% of 1005 or(+/-)10.05 cP. 3)Total allowable error is (10.05 + 60) cP = (+/-) 70.05 cP. 4)Viscosity reading between 935 and 1075.1 cP indicates that the Viscometer is operating correctly. Reading outside these limits may indicate a Viscometer problem. |
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| 5.4.35 | For more information of Constant values of SMC and TK refer operational manual Table D-1 and Table D-2 at page 68,69,70 | ||||||||||||||||||
| 5.4.36 | Enter the details in calibration report. Ensure that the results obtained, should complies with the acceptance criteria. If instrument fails to meet to acceptance criteria then file an incident and investigate the cause of failure. | ||||||||||||||||||
| 5.4.37 | If calibration activity is outsourced, the values are to be transcribed in the Annexure No. 01, and external party certificate to be attached. | ||||||||||||||||||
| 5.5 | Cleaning Procedure: | ||||||||||||||||||
| 5.5.1 | Make sure that the instrument is in a clean, dry working environment (dust-free, moderate temperature, low humidity, etc.). | ||||||||||||||||||
| 5.5.2 | Make sure the instrument is on a level surface. | ||||||||||||||||||
| 5.5.3 | Hands/fingers must be clean and free of sample residue. Not doing so may result in deposit build up on the upper part of the shaft and cause interference between the shaft and the pivot cup. | ||||||||||||||||||
| 5.5.4 | Be sure to remove the spindle from the instrument prior to cleaning. If the spindle is cleaned in place Severe instrument damage may occur. | ||||||||||||||||||
| 5.5.5 | Instrument and display Clean with a dry, non-abrasive cloth. Do not use solvents or cleaners. The instrument housing is manufactured from polycarbonate ABS. Clean instrument housing with mild soap and water. | ||||||||||||||||||
| 5.5.6 | Spindles are made of stainless steel. Clean with a non-abrasive cloth and solvent appropriate for sample material. | ||||||||||||||||||
| 5.5.7 | When cleaning, do not apply excessive force, which may result in bending spindles. | ||||||||||||||||||
- Definitions / Abbreviations:
- Definitions:
- Calibration: Tests performed to ensure that the instrument is functioning as per set parameters. These tests are performed as per predefined frequency and also after any major repair or replacement of parts.
- Viscosity: – A quantity expressing the magnitude of internal friction in a fluid, as measured by the force per unit area resisting uniform flow.
- Digital Viscometer: – Viscosity is the measure of the internal friction of a fluid. This friction becomes apparent when a layer of a fluid is made to move in relation to another layer. The greater the friction, the greater the amount of force required to cause this movement, which is called shear.
- Abbreviations:
| Abbreviation | Expansion |
| ± | Plus or Minus |
| No. | Number |
| A.R.No. | Analytical Reference Number |
| mg | milligram |
| ml | millilitre |
| cm | Centimetre |
| cP | Centipoise |
| CFR | Code of federal regulation |
| vs | verses |
| ° | Degree |
| FSR | Full Scale Range |
| SRC | Shear Rate Constant |
| SMC | Spindle Multiplier Constant |
| RPM | Rotation per minute |
Calibration Report
- TEMPERATURE CALIBRATION:-
| Description of test | Set Temperature | Acceptance Criteria | Observation | Remarks | |
| Internal Temperature Probe | External Temperature Probe | ||||
| Temperature | 25.0 ºC | 25.0 ± 0.1 ºC | |||
- SPINDLE CALIBRATION BY USING VISCOSITY STANDARD FLUID:-
- Standard Fluid Viscosity as per Certificate = ________cP (A)
2. 1 % value of Standard Fluid Viscosity = A * 1___
100
=____________________ (B)
3. Calculation of Full Scale viscosity Range (FSR) :-
FSR (cP) = TK * SMC* 10000_
RPM
*Note: – For value of Torque Constant (TK) and Spindle Multiplier Constant (SMC) refer SOP
- Calculation of Viscosity Acceptable Range :-
| Low Limit | High Limit |
| A – (B + C) | A + (B + C) |
- Viscosity check for Spindle :-
| Spindle Number | RPM | Observed Viscosity (cP) | Observed
Torque (%) |
FSR
|
1% of FSR
(C) |
Acceptance Criteria | Remark | |
| Low
Limit |
High
Limit |
|||||||
| 61 | 1 | |||||||
| 2 | ||||||||
| 4 | ||||||||
- Viscosity check for Spindle :-
| Spindle Number | RPM | Observed Viscosity (cP) | Observed
Torque (%) |
FSR
|
1% of FSR
(C) |
Acceptance Criteria | Remark | |
| Low
Limit |
High
Limit |
|||||||
| 63 | 10 | |||||||
| 30 | ||||||||
| 60 | ||||||||
Remark: The result Complies/Does not complies as per acceptance criteria.
Performed By: ________________ Date: ____________ Checked By: ______________ Date: ______________