7. SOP
1) Turn on the viscometer and allow standing,
must be auto zero. After the few seconds the
screen appears which indicates 2 digits.
2) Now press the key. The screen displays the
instruction to remove spindle. After removing
the spindle and pressing the key the
instrument begins. It is auto zeroed.
3) After approximately 15 second the screen
displays the instruction to replace spindle
4) Attach the spindle to viscometer by screwing
them on the lower shaft using left hand
thread.
APC, S.P.Patel 7
8. 5) Press select spindle key and up and down arrow
keys. When the desired code is displayed
release the arrow key.
6) To select spindle, first press either up and down
key which cause the area to show current speed,
press the set speed key for adjusting the speed.
7) Insert center of this spindle in the test material until
the fluid level is at the immersion groove on the
spindle shaft. Tilt the spindle slightly while
immersing to avoid air entrapment.
8) To measure high viscosity choose a small spindle
and to slow speed if the chosen spindle/speed
result in torque above 100% and then reduce the
value.
APC, S.P.Patel 8
9. 9) Allow time for the individual reading to stabilize,
record the value.
10) Press the motor on/off/escape key to turn off motor
11) The time mode allows the user to record the
reading for fixed period of time or until a set torque
value is attained.
12) Then enter/auto turnkey allows determining
maximum calculated viscosity possible with current
spindle/speed.
13) Pressing the up and down arrow keys will allow the
viscometer data to be examine, pressing and other
key ( except enter/ print key) will bring back
normal display.
14) Turn off the mains after use.
APC, S.P.Patel 9
11. IQ: INSTALLATION
QUALIFICATION
Inspect package for shipping damage
Confirm that all components have been
supplied as detailed in the Operating
Manual and Packing List
Assemble lab stand as shown in manual.
Mount viscometer head to assembled lab
stand as shown in manual.
Verify appropriate spindle set (LV #1-
#4)(RV/HA/HB #2-#7)
APC, S.P.Patel 11
12. OQ: OPERATION
QUALIFICATION
Level viscometer using adjustable feet
Remove shipping cap on spindle
coupling nut
Power on Viscometer and follow
instructions displayed to complete auto
zero
Perform oscillation check.
APC, S.P.Patel 12
13. PQ: PERFORMANCE
QUALIFICATION
Verify calibration using a minimum of
one calibrated viscosity standard fluid
according to the procedure described
below
Centipoise reading should be within the
value stated on the fluid ± the instrument
accuracy and the fluid accuracy.
APC, S.P.Patel 13
14. Oscillation check
This check verifies the mechanical
condition of the sensing mechanism in the
viscometer.
Auto-zero the instrument according to
directions in the manual.
Do not attach the spindle but do press any
key so the main screen will be displayed.
The display should show 0.0% torque. The
tolerance for this and all tests is ±0.1%
APC, S.P.Patel 14
15. 1) Start the motor rotating at 10 or 20
RPM.
2) The % reading should initially bounce,
then is should stabilize at 0.0% ±0.1%
3) Stop the motor. When the % display
again stabilizes it should return to 0.0%
±0.1%
APC, S.P.Patel 15
16. Operational and Calibration
Check
Determining Measurement Accuracy
All Brookfield instruments are guaranteed to be
accurate to within 1% of the full scale
range(FSR) in use.
The full scale range (FSR) is simply the
maximum viscosity that can be measured with
any spindle/speed combination.
Select a specific spindle and rotational speed.
To determine the resulting FSR (full scale
range), depress and hold the AUTORANGE key.
APC, S.P.Patel 16
17. The % display will show 100% and the
cP display will show the FSR (full scale
range) that can be measured under
current choice of spindle and speed.
1% of this value is the measurement
accuracy under these conditions.
APC, S.P.Patel 17
18. Calibration Check
In principle, all Brookfield rotational
viscometers are calibrated torque meters.
Brookfield offers a variety of viscosity
calibration fluids that enable one to check
the calibration and linearity of the instrument
over its operating torque range of 10%-
100% torque.
APC, S.P.Patel 18
19. Any spindle and any one of several calibration
fluids may be used to perform a calibration
check.
Experts recommend using one spindle and one
fluid while taking measurements at multiple
speeds.
This enables multiple calculations of viscosity
throughout the torque range of the instrument;
one at low torque, one at medium torque and one at
high torque.
The FSR, and consequently the instrument
accuracy in terms of centipoise, will be different
at each speed.
APC, S.P.Patel 19
20. The calibration fluid must be transferred into
a 600ml low form, Griffin beaker (without
creating any bubbles) and,
on LV and RV models, the instrument Guard
Leg must be used.
The beaker, fluid, spindle and Guard Leg
must stabilized at 25.0°C (±0.1°C) before the
calibration check can be performed.
APC, S.P.Patel 20
21. EX:
Actual viscosity is 5,120cP,
Allowable error = 1% of the FSR + 1% of the
actual value of the calibration fluid
The lower and upper viscosity limits,
indicating acceptable calibration, equal the
actual value of the fluid,
in this case 5,120cP, ± the allowable error.
APC, S.P.Patel 21
22. RPM MIN
cP
MAX cP
(FSR)
1% of
FSR
%
torque
cP
READIN
G
ALLOWAB
LE
ERROR
12 1000 10000 100 51.2 5120 ± 151
6 2000 20000 200 25.5 5100 ± 251
3 4000 40000 400 12.7 5080 ± 451
Allowable error = 1% of the FSR + 1% of the actual
value of the calibration fluid
APC, S.P.Patel 22
23. Calibration Worksheet
A B C D E F G H I
Fluid
Value
from
Certificate
cP
1% of
Fluid
Value
cP
Instrument
Model
Spindle RPM FSR
cP
(depre
ss
and
hold
AUTORA
NGE
key)
1% of
FSR
cP
1% of
FSR
cP
Visco
sity
cP
APC, S.P.Patel 23
24. The viscosity reading should equal the cP value on the
fluid standard to within the combined accuracies of
the Viscometer and the viscosity standard as calculated
below
Low Limit
= A – (B + G)
Reading
I
High Limit
= A + (B + G)
Pass or Fail
APC, S.P.Patel 24
25. Any reading outside these limits may
indicate a Viscometer problem.
Contact the Brookfield technical sales
department or your local Brookfield
dealer/distributor with test results to
determine the nature of the problem.
APC, S.P.Patel 25
