|
Series 35 Viscometer by Fann
|
Product Manual: Viscometer, Model 35 |
Viscometer, Model 35
Section 1: DescriptionSection 2: Safety ConsiderationsSection 3: Viscosity TestSection 4: Changing Rotors, Bobs, and Torsion SpringSection 5: Instrument CalibrationSection 6: Data ReductionSection 7: Measuring RangeSection 8: Trouble Shooting and MaintenanceSection 9: SpecificationsSection 10: AccessoriesSection 11: Parts List
Table 1: Six-Speed Testing CombinationsTable 2: Twelve-Speed Testing CombinationsTable 3: Dial Defection for Calibration Weights and Torsion Spring AssembliesTable 4: Calculated C Values from Rotor-Bob DimensionsTabel 5: Speed Factor S Base 300 rpm = 1Table 6: Measuring Range for FANN Direct Indicating ViscometerTable 7: Rotor-Bob Dimensions
Figure 1: Model 35 ViscometerFigure 2: Model SR-12 Gear BoxFigure 3: Rotor Removal/InstallationFigure 4: Torsion Spring Removal and ReplacementFigure 5: Dead Weight Calibration CheckFigure 6: Model 35 Parts IdentificationViscometer, Model 35
Section 1: Description
| The
FANN® Model 35 viscometer are direct reading instruments which are
available in six speed and 12 speed designs for use on either 50 Hz or
60 Hz electrical power. The standard power source is 115 volts but all
of the models may be fitted with a transformer which makes operation
with 220/230 volts possible.
These are Couette coaxial cylinder rotational viscometer since the
test fluid is contained in the annular space (shear gap) between an
outer cylinder and the bob. Viscosity measurements are made when the
outer cylinder, rotating at a known velocity, causes a viscous drag to
be exerted by the fluid. This drag creates a torque on the bob, which
is transmitted to a precision spring where its deflection is measured.
Viscosity as measured by a Couette type viscometer such as the Model 35
is a measure of the shear stress caused by a given shear rate. This
relationship is a linear function for Newtonian Fluids, i.e. a plot of
shear stress vs. shear rate is a straight line.
These instruments have been designed so that viscosity in centipoise
(or milli-Pascal seconds) of a Newtonian fluid is indicated on the dial
with the standard rotor, bob, and torsion spring operating at 300 rpm.
Viscosities at other test speeds may be measured by using multipliers
of the dial reading. A simple method of close approximation of
viscosity in a plastic fluid, such as a drilling fluid is described in
Section 6B.
The range of shear rates may be changed by selecting rotor
speed and using various rotor-bob combinations. A variety of torsion
springs are available and designed to be easily interchanged in order
to broaden shear stress ranges and allow the measuring of viscosity in
a wide variety of fluids.
Figure 1
Model 35 Viscometer
|
Section 2: Safety ConsiderationsSAFE OPERATIONs
| The
safe operation of the FANN Model 35 Series Viscometer requires that the
laboratory technician be familiar with the proper operating procedures
and potential hazards associated with the instrument. This instrument
is driven by 115 volt or 230 volt electrical power. Keep hands, clothes
and other objects away from the rotating parts of the machine.
The optional heated sample cups and recirculating sample cups are
electrically heated. Make sure the power cord and other wiring
associated with these cups is no good condition and properly grounded.
Make sure the viscometer is turned off and unplugged from the source
before cleaning or other repair or maintenance. Do not allow the
Viscometer Base to get wet. If samples have been spilled or splattered,
wipe clean with a damp cloth. Do not allow water to run into the base,
as exces-sive water could cause damage to the electrical components. |
STANDARD B1 BOB
| The
standard B1 Bob normally furnished with the Model 35 Series Viscometer
is a hollow Bob and must not be to test samples hotter than 200°F
(93°C). Solid Bobs are available for this type testing. |
SAFE OPERATION OF THE OPTIONAL HEATED SAMPLE CUP
| Precautions
should be taken when testing heated samples using the optional heated
sample cups to avoid possible burns from spilled hot sample, or from
touching the hot sample cup.
When heated sample cups are being used, do not exceed 200°F |
Section 3: Viscosity TestViscosity Test Overview
| The
stainless steel sample cup provided has a line at the proper 350 ml
test fluid level. Fill the cup to that line with recently stirred test
fluid. A scribed line on the rotor indicates proper immersion depth.
Refer to Fig. 1. Damage to the bob shaft bearings may occur if this
immersion depth is exceeded. If other sample holders are used, the
space between the bottom of the rotor and the bottom of the sample
holder should be one-half inch (1.27cm) or greater.
WARNING
THE STANDARD B1 BOB IS HOLLOW AND SHOULD NEVER
BE USED TO TEST SAMPLES HOTTER THAN 200°F. (93°C).
|
Model 35A and Model 35SA
| The
Model 35A and 35SA viscometer are instruments with the ability to test
at six different speeds. Their range is from 3 rpm up to 600 rpm with
the speed being determined by a combination of speed switch setting and
viscometer gear knob placement. To select the desired speed, set the
speed switch located on the right side of the base to the high or low
speed position as desired. Then turn the motor on and move the
viscometer gear shift knob located in the center of the top of the
instrument to its desired position.
Table 1 lists the proper positions for the viscometer switch and the
gear knob combinations to obtain the desired speed. The viscometer gear
shift knob may be engaged while the motor is running. Read the dial for
shear stress values.
TABLE 1
|
Speed RPM |
Viscometer Switch |
Gear Knob |
|
600 |
High |
Down |
|
300 |
Low |
Down |
|
200 |
High |
Up |
|
100 |
Low |
Up |
|
6 |
High |
Center |
|
3 |
Low |
Center |
|
SR-12 Model 35A/SR12 and 35SA/SR12
| The
Model 35A/SR12 and 35SA/SR-12 have twelve speed testing capabilities.
To achieve this broader testing range (from 0.9 rpm up to 600 rpm) an
additional gear box shift lever is used and it is located on the right
side of the gear box. Refer to Fig. 2. Position this lever to the Left
or Right as determined from Table 2.
CAUTION
NEVER CHANGE THIS GEAR BOX SHIFT LEVER WHILE THE MOTOR IS RUNNING. GEAR DAMAGE WILL RESULT.
Only the viscometer gear shift knob on the top of the instrument can be changed while the motor is running.
After preparing the instrument for 12-speed testing by setting the
gear box shift lever, select the proper speed range with the speed
shift switch on the right side of the base, then turn on the motor and
set the viscometer gear knob on the top of the instrument. Refer to
Table 2 for the correct combination of gear box shift lever setting;
speed switch selection; and viscometer gear knob placement. The stress
values will appear on the dial.
Figure 2
Gear Box Lever
TABLE 2
TWELVE-SPEED TESTING COMBINATIONS
MODEL 35A/SR12 AND MODEL 35SA/SR12
|
RPM |
Gear Box Lever |
Speed Switch |
Viscometer Gear Knob |
|
600 |
Left |
High |
Down |
|
300 |
Left |
Low |
Down |
|
200 |
Left |
High |
Up |
|
180 |
Right |
High |
Down |
|
100 |
Left |
Low |
Up |
|
90 |
Right |
Low |
Down |
|
60 |
Right |
High |
Up |
|
30 |
Right |
Low |
Up |
|
6 |
Left |
High |
Center |
|
3 |
Left |
Low |
Center |
|
1.8 |
Right |
High |
Center |
|
0.9 |
Right |
Low |
Center |
|
Gel Strength
| Gel
strengths are measured by first stirring the sample thoroughly at 600
rpm. Set gears to the neutral position and turn motor off. After
desired wait period, turn gel knob, located below gear shift knob,
refer to Fig. 1, slowly counterclockwise and read the dial at instant
of the gel break (Peak Dial Reading). Gel reading is in lbs/100 ft2. |
Section 4: Changing Rotors, Bobs, and Torsion SpringOverview
| The
R1-B1-F1 rotor-bob-torsion spring combination is standard for all FANN
viscometer. Other rotor-bob combinations may be used, provided shear
rates are calculated for the fluid being tested. Use of rotor-bob
combinations which result in large gap sizes can lead to shear stress
dial readings not consistent with readings from a smaller gap. |
Rotor removal and Replacement
| The
rotor can be removed from its socket by twisting counterclockwise, when
viewed from above, while gently pulling straight down.
The rotor may be replaced by aligning the rotor slot and groove with
the lock pin in the main shaft socket. Push the rotor upward and lock
it into position by turning it clockwise.
|
Bob removal and Replacement
| The
bob shaft end that fits into the Bob is tapered and fits into a
matching tapered hole in the bob. To remove the bob twist the bob
clockwise while pulling downward. To install the bob, twist it
clockwise while pushing upward. |
Torsion Spring Removal and Replacement
Refer to Fig. 4 for identification of parts.
- Remove the dust cap [A] and plug screw [B].
- Loosen set screws [C] and [D] about 1/2 turn. The spring can now be lifted out. Be careful not to stretch the spring.
- Insert the new spring, making sure the bottom mandrel is
properly oriented and seated. Set screw [D] should line up with the
point at which the spring leaves the bottom mandrel. A notch cut into
the upper end of the bottom mandrel will help locate this point.
Tighten set screw [D], so that it presses against the split ring to
hold the bottom mandrel of the spring.
NOTE: Before tightening
set screw [C] be positive that the top of the adjustable mandrel is
flush with the top of clamp [E]. It may be necessary to slightly
compress or stretch the spring to accomplish this.
- Tighten set screw [C]. The slot in the top of the adjustable mandrel should line up with clamping set screw [C].
- Loosen set screw [F] to zero dial under index, then rotate
knob [G] as required for alignment, then adjust knob [G] vertically to
allow the spring to be clamped in a "free" position, neither stretched
or compressed.
- Tighten set screw [F] and replace the dust cap [A].
Figure No. 4
Torsion Spring Removal and Replacement
|
Section 5: Instrument CalibrationOverview
| Periodically
the Model 35 Series Viscometer should be checked for proper calibration
and if found in error the viscometer should be calibrated or repaired.
Continued accuracy of measurements requires the instrument be properly
calibrated. The calibration is checked by applying know torques to the
bob shaft. For any applied torque, within the torque range of the
spring, there should be a specific dial reading plus or minus a small
tolerance. Two methods of calibration are described.
The Dead Weight Calibration is easier to perform and if the spring
requires adjustment, the proper setting can easily be verified. The
Standard Fluid Calibration check verifies the complete instrument is
operating properly. It will determine problems of bent bob shaft, rotor
eccentricity, and/or runout of the rotor or bob more effectively than
the Dead Weight method. Refer to Section 5-B. |
Dead Weight Calibration Check Using Model DW3 Calibration Kit.
Note: Refer to Fig. 5.
- Remove rotor and bob. Refer to Section 3-A and 3-B. Be sure that
the tapered end of the bob shaft is clean, then install the calibrating
spool.
- Install the DW-3 calibrating fixture by clamping it onto the upper portion of the viscometer support legs.
- Select a weight according to Table 3. Insert the bead at the
end of the thread into the recess in the top of the calibrating spool.
Wrap the thread a little more than once around the spool and then drape
the thread over the pulley.
- Hang the selected weight on the thread and adjust the
calibrating fixture up or down until the thread from the spool to the
pulley is horizontal. Compare the dial reading with the reading on
Table 3.
- If necessary, adjust the torsion spring. Refer to Section 5-C, "Adjusting Torsion Spring".
Factory tolerances for F1 spring only are 127 ± 1/2° for 50 g
and 254 ± 1/2° for 100 g. A movement of ± 1/2° is permissible when the
main shaft is turning. This movement will generally be dampened out
when a fluid is being tested. Check the linearity of the dial reading
with at least three weights. If the spring appears to be non-linear it
is usually a sign that the bob shaft is bent. An instrument with these
characteristics needs additional service and/or repair.
Figure No. 5
Dead Weight Calibration
DW-3 Calibration Fixture
TABLE 3
Dial Deflection for Calibration Weights And Torsion Spring Assemblies
|
Torsion Spring Assembly (with R1-B1 combination) |
Torsion Spring Constant, K1 Dynes/cm/° def |
Weight in Grams |
| |
|
10 |
20 |
50 |
100 |
200 |
| |
|
Dial Reading |
|
F-0.2 |
77.2 |
127.0 |
254.0 |
- |
- |
- |
|
F-0.5 |
193.0 |
50.8 |
101.6 |
254.0 |
- |
- |
|
F-1 |
386.0 |
25.4 |
50.8 |
127.0 |
254.0 |
- |
|
F-2 |
772.0 |
- |
25.4 |
63.5 |
127.0 |
254.0 |
|
F-3 |
1158.0 |
- |
- |
43.0 |
84.7 |
169.4 |
|
F-4 |
1544.0 |
- |
- |
- |
63.5 |
127.0 |
|
F-5 |
1930.0 |
- |
- |
- |
50.8 |
101.6 |
|
F-10 |
3860.0 |
- |
- |
- |
- |
50.8 |
|
Fluid Calibration Check
This
procedure is to be used for calibration using only Newtonian certified
calibration fluids. Fann Calibration Fluids are available in nominal
20, 50, 100, 200, and 500 cP. All are traceable to ASTM standards and
each bottle of fluid is furnished with a viscosity temperature chart
certifying that batch of fluid.
- The instrument being checked must be clean before immersing the
rotor and bob into the calibration fluid. If necessary, remove the
rotor and thoroughly clean the bob, bobshaft, and rotor. Make sure the
bob shaft and rotor are straight and have not been damaged.
CAUTION:
The batch number on the label of the calibration fluid must match the number on the viscosity/temperature chart.
- Fill the sample cup to the scribed line with calibration
fluid and place it on the instrument stage. Elevate the stage so that
the rotor is immersed to the proper immersion depth. Refer to Fig. 1.
- Place a thermometer into the sample until the bulb touches
the bottom and then secure it to the side of the viscometer to prevent
breakage.
- Operate the instrument at 300 rpm for three (3) minutes. This will equalize the temperature of the bob, rotor and the fluid.
- Read the dial at 300 rpm and 600 rpm. Record these numbers,
and the temperature from the thermometer to the nearest 0.1° C,(0.15°
F).
The viscosity from the temperature chart at the recorded
temperature should be within ±2 cP of the 300 rpm reading. Twice the cP
viscosity from the chart should be within ± 3 of the 600 rpm reading.
Plot the 300 rpm reading and the 600 rpm reading then draw a straight
line from zero through these two points. If zero, 300 and 600 points do
not fall in a straight line, probably either the rotor, bob or bobshaft
is bent or other eccentricity exists. Points at 100 rpm and 200 rpm can
be plotted if verification is needed. Readings outside the specified
limits are indications that the instrument should be either calibrated
or repaired. Refer to Section 5-C for procedure to calibrate the
spring. After completion of the calibration check, carefully wipe clean
the rotor inner and outer surfaces, the bob, the thermometer, the
sample cup, and work area. |
Torsion Spring Calibration
Refer to Fig. 4 for identification of parts.
NOTE: Make sure the bob shaft is not bent before attempting to adjust the torsion spring.
- Remove dust cap [A], then loosen set screw [C] about 1/2 turn.
- Insert the calibration tool into the spring and rotate the
adjustable mandrel (inside the spring) slightly. Turn the mandrel
counterclockwise if the dial reading is too low or turn the mandrel
clockwise if the dial reading is too high.
NOTE: Before
tightening set screw [C] check the top of the upper threaded mandrel
and be positive that it is flush with the top of the clamp [E]. To
accomplish this, it may be necessary to adjust the spring by slightly
compressing or stretching the spring.
- Tighten set screw [C]. The slot in the top of the adjustable mandrel should line up with clamping set screw [C].
- Loosen set screw [F] to zero dial under index, then rotate
knob [G] as required for alignment, then adjust knob [G] vertically to
allow the spring to be clamped in a "free" position, neither stretched
or compressed.
- Tighten set screw [F] and replace the dust cap [A].
|
Figure 5: Dead Weight Calibration DW-3 Calibration Fixture
|
Figure No. 4
Dead Weight Calibration
DW-3 Calibration Fixture
|
Section 6: Data ReductionNewtonian Viscosity Calculations
| Newtonian
Viscosity in centipoise may be read directly from the dial when
viscometer is run at 300 rpm with R1-B1-F1 combination. Other springs
may be used providing the dial reading is multiplied by the "f" factor
(spring constant).
To rapidly determine Newtonian viscosities in cP with FANN viscometer, use the following formula:
- nN = S x x f x C
where,
- S = Speed factor (Refer to Table 5)
0 = Dial reading
f = Spring factor (Refer to Table 3)
C = Rotor-bob factor (Refer to Table 4)
nN = Newtonian viscosity - cP
Example: Using an R2-B1 combination at a speed of 600 rpm with an F5.0 spring, and a dial deflects to 189.
- nN = 0.5 x 189 x 5 x .315 = 149 cP.
NOTE:
- Combinations with the larger gaps are likely to give results
that differ from these figures. For best accuracy, calibrate with a
standard fluid having a viscosity near the range of interest and using
the R-B-F combination to be used in the test.
TABLE 4
Calculated C values from rotor-bob dimensions
|
Rotor-Bob
Combination |
R-B Factor
C |
|
R1-B1 |
1.000 |
|
R1-B2 |
8.915 |
|
R1-B3 |
25.392 |
|
R1-B4 |
50.787 |
|
R2-B1 |
.315 |
|
R2-B2 |
8.229 |
|
R2-B3 |
24.707 |
|
R2-B4 |
49.412 |
|
R3-B1 |
4.517 |
|
R3-B2 |
12.431 |
|
R3-B3 |
28.909 |
|
R3-B4 |
57.815 |
|
TABLE 5
Speed Factor S base 300 rpm = 1
|
Rotor
rpm |
Speed Factor
S |
|
.9 |
333.3 |
|
1.8 |
166.6 |
|
3 |
100 |
|
6 |
50 |
|
30 |
10 |
|
60 |
5 |
|
90 |
3.33 |
|
100 |
3 |
|
180 |
1.667 |
|
200 |
1.5 |
|
300 |
1.0 |
|
600 |
.5 |
|
|
Approximation of Plastic Viscosity and Yield Point
| Using
R1-B1-F1 components, test a sample running the viscometer at 600 rpm
and note the dial reading. Change the speed to 300 rpm and note the
dial reading. Determine the PV and YP using the following equations. PV
represents the slope of a straight line between the two dial readings.
YP represents the theoretical point at which the straight line, when
projected, will intercept the vertical axis. PV (plastic viscosity, (lbs/100 ft2)/300 rpm) = 600 - 300
YP (yield point in lbs/100 ft2) = 300 - PV
CAUTION
A spring other than F1 may be used if the dial readings are
multiplied by the proper "f" factor, but the other rotor-bob
combinations can not be used for this rapid, two point method.
|
Calculation of the Spring Constant (Dead Weight Method
-
K1 = Grg /
Where K1 = spring constant - dynes/cm/degree deflection
- G = Load in grams
- g = 981 = gravitational constant (cm/sec2)
- r = Radius arm = 1 cm
- = Dial reading in degrees
Example: The required setting for the F1 spring is 386
dynes/cm/degree deflection with the R1-B1 combination. Using the 50 gm
weight supplied with the fixture, the formula is:
- K1 =
|
Section 7: Measuring Range
|
Measuring Range for FANN Model 35 Viscometers
|
|
ROTOR-BOB |
R1 B1 |
R2 B1 |
R3 B1 |
R1 B2 |
R1 B3 |
R1 B4 |
|
BASIC DATA |
|
Rotor Radius, Ro, cm |
1.8415 |
1.7588 |
2.5866 |
1.8415 |
1.8415 |
1.8415 |
|
Bob Radius, Rj, cm |
1.7245 |
1.7245 |
1.7245 |
1.2276 |
0.8622 |
0.8622 |
|
Bob Height, L, cm |
3.800 |
3.800 |
3.800 |
3.800 |
3.800 |
1.900 |
|
Shear Gap, in Annulus, cm |
0.1170 |
0.0343 |
0.8261 |
0.6139 |
0.9793 |
0.9793 |
|
Radii Ratio, Rj / Ro |
0.9365 |
0.9805 |
0.667 |
0.666 |
0.468 |
0.468 |
|
Maximum Use Temperature, oC |
93 |
93 |
93 |
93 |
93 |
93 |
|
Minimum Use Temperature, oC |
0 |
0 |
0 |
0 |
0 |
0 |
|
Overall Instrument Constant, K |
300.0 |
94.18 |
1355 |
2672 |
7620 |
15,200 |
|
Standard F1 Torsion Spring
h= Kfq/N
|
|
SHEAR STRESS RANGE |
|
Shear Stress Constant for Effective |
|
Bob Surface k2, cm-3 |
0.01323 |
0.01323 |
0.01323 |
0.0261 |
0.0529 |
0.106 |
|
Shear Stress Range, dynes/cm2g
= k1k2q
|
|
F 0.2 q
= 1o |
1.02 |
1.02 |
1.02 |
2.01 |
4.1 |
8.2 |
|
F 0.2 q
= 300o |
307 |
307 |
307 |
605 |
1225 |
2450 |
|
F 0.5 q
= 1o |
2.56 |
2.56 |
2.56 |
5.04 |
10.2 |
20.4 |
|
F 0.5q
= 300o |
766 |
766 |
766 |
1510 |
3060 |
6140 |
|
F1 q
= 1o |
5.11 |
5.11 |
5.11 |
10.1 |
20.4 |
40.9 |
|
F1 q
= 300o |
1533 |
1533 |
1533 |
3022 |
6125 |
12,300 |
|
F2 q
= 1o |
10.22 |
10.22 |
10.22 |
20.1 |
40.8 |
81.8 |
|
F2 q
= 300o |
3066 |
3066 |
3066 |
6044 |
12,250 |
24,500 |
|
F3 q
= 1o |
15.3 |
15.3 |
15.3 |
30.2 |
61.3 |
123 |
|
F3 q
= 300o |
4600 |
4600 |
4600 |
9067 |
18,400 |
36,800 |
|
F4 q
= 1o |
20.4 |
20.4 |
20.4 |
40.3 |
81.7 |
164 |
|
F4 q
= 300o |
6132 |
6132 |
6132 |
12,090 |
24,500 |
49,100 |
|
F5 q
= 1o |
25.6 |
25.6 |
25.6 |
50.4 |
102 |
205 |
|
F5 q
= 300o |
7665 |
7665 |
7665 |
15,100 |
30,600 |
61,400 |
|
F10 q
= 1o |
51.1 |
51.1 |
51.1 |
100.7 |
204 |
409 |
|
F10 q
= 300o |
15330 |
15330 |
15330 |
30,200 |
61,200 |
123,000 |
|
SHEAR STRESS RANGE |
|
Shear Rate Constant k3, sec-1 per rpm |
1.7023 |
5.4225 |
0.377 |
0.377 |
0.268 |
0.268 |
|
Shear Rate range, sec-1 ¡
= k3N |
|
N = 0.9 rpm |
1.5 |
4.9 |
0.4 |
0.4 |
0.24 |
0.24 |
|
N = 1.8 rpm |
3.1 |
9.8 |
0.7 |
0.7 |
0.48 |
0.48 |
|
N = 3 rpm |
5.1 |
16.3 |
1.1 |
1.1 |
0.80 |
0.80 |
|
N = 6 rpm |
10.2 |
32.5 |
2.3 |
2.3 |
1.61 |
1.61 |
|
N = 30 rpm |
51.1 |
163 |
11.3 |
11.3 |
8.0 |
8.0 |
|
N = 60 rpm |
102 |
325 |
22.6 |
22.6 |
16.1 |
16.1 |
|
N = 90 rpm |
153 |
488 |
33.9 |
33.9 |
24.1 |
24.1 |
|
N = 100 rpm |
170 |
542 |
37.7 |
37.7 |
26.8 |
26.8 |
|
N = 180 rpm |
306 |
976 |
67.9 |
67.9 |
48.2 |
48.2 |
|
N = 200 rpm |
340 |
1084 |
75.4 |
75.4 |
53.6 |
53.6 |
|
N = 300 rpm |
511 |
1627 |
113 |
113 |
80.4 |
80.4 |
|
N = 600 rpm |
1021 |
3254 |
226 |
226 |
161 |
161 |
|
VISCOSITY RANGE IN CENTIPOISE |
|
Minimum Viscosity(2) |
|
All models, 600 rpm maximum |
0.5(3) |
0.5(3) |
2.3 |
4.5 |
12.7 |
25 |
|
Maximum Viscosity(4) |
|
For Model 34A & HC34A, 300 rpm min. |
300 |
94 |
1,350 |
2,700 |
7,620 |
15,000 |
|
For Model 35A & 35SA, 3 rpm min. |
30,000 |
9,400 |
135,000 |
270,000 |
762,000 |
1,500,000 |
|
For Model 35A/SR 12 & 35SA/SR 12, 0.9 rpm min.
|
10,000 |
31,400 |
400,000 |
890,000 |
2,550,000 |
5,000,000 |
Notes:
- Computed for standard Torsion Spring (f = 1) For other torsion springs multiply viscosity range by f factor
- Minimum viscosity is computed for minimum shear stress and maximum shear rate
- For practical purposes the minimum viscosity is limited to 0.5 cP because of Taylor Vortices
- Maximum viscosity is computed for maximum shear stress and minimum shear rate
|
|
Section 8: Trouble Shooting and MaintenanceTroubleshooting
|
Symptoms |
Causes |
|
Erratic dial motion |
1. Contaminated bob shaft bearings
2. Bent bob shaft
3. Rotor out of alignment
4. Incorrectly adjusted main shaft |
|
Out of calibration |
1. Contaminated bob shaft
2. Bent bob shaft
3. Bent rotor
4. Friction in bob shaft bearings
5. Damaged or incorrectly installed torsion spring
6. Motor needs replacement |
|
Excessive noise |
1. Lubrication failure or contamination in gears
2. Worn center shaft bushing
3. Top cover can create a bind in gear train if set improperly |
|
Excessive run-out of rotor |
1. Damaged rotor
2. Contamination in main shaft recess |
|
Sticking support legs |
1. Corrosion/contamination within support legs
2. Broken spring
3. Legs out of adjustment |
|
Loose gear housing |
1. Bolts attaching gear housing to support legs are loose |
|
Maintenance
| The
bob and rotor should be cleaned after each test and examined
periodically for dents, abrasion or other damage. Oiling or greasing of
the viscometer is not required in normal service. Always remove the bob
from the bob shaft when transporting instrument to avoid bending bob
shaft.
Periodically test the bob shaft bearings. Operate the instrument at
3 or 6 rpm with no sample around the rotor and bob. Observe movement of
the dial. It should not move more that +/- 1 division. Rough bob shaft
bearings should be replaced.
Instrument should be serviced by qualified personnel only. If factory
service is required, contact Fann for return authorization.
|
TroubleshootingContent does not exist!Section 9: Specifications
|
Part No. |
Model No. |
Speeds RPM |
Power Req. |
Size |
Weight |
| |
|
|
|
|
H |
W |
D |
LB |
KG |
|
30164 |
35A |
3, 6, 100, 200
300 and 600 |
115 Volts, 60 Hz,
.075 Amps |
In.
Cm. |
15.2
39 |
6
15 |
10.5
27 |
15 |
6.8 |
|
30165 |
35SA |
3, 6, 100, 200
300 and 600 |
115 Volts, 50 Hz,
0.75 Amps |
In. |
15.2 |
6 |
10.5 |
15 |
6.8 |
|
30166 |
35A/SR-12 |
.09, 1.8, 3, 6, 30,
60, 90, 100, 180,
200, 300 and 600 |
115 Volts, 60 Hz,
0.75 Amps |
In.
Cm. |
15.2
39 |
6
15 |
10.5
27 |
17 |
7.7 |
|
30167 |
34SA/SR-12 |
0.9, 1.8, 3, 6, 30,
60, 90, 100, 180,
200, 300 and 600 |
115 Volts, 50 Hz,
0.60 Amps |
In.
Cm. |
15.2
39 |
6
15 |
10.5
27 |
17 |
7.7 |
TABLE 7
Rotor-Bob Dimensions
|
Unit |
r-cm |
Length-cm |
Cyl. Area-cm2 x Radius-cm |
|
B1 |
1.7245 |
3.8 |
71.005 |
|
B2 |
1.2276 |
3.8 |
35.981 |
|
B3 |
0.86225 |
3.8 |
17.751 |
|
B4 |
0.86225 |
1.9 |
8.876 |
|
R1 |
1.8415 |
|
|
|
R2 |
1.7589 |
|
|
|
R3 |
2.5867 |
|
|
|
Section 10: Accessories
|
Torsion Springs |
|
Part No. |
F. |
Constant |
Max Shear Stress |
Color Code |
|
31068
31069
30752
31070
31071
31072
31073
31074 |
F0.2
F0.5
F1
F2
F3
F4
F5
F10 |
|
77.2
193
386
772
1,158
1,544
1,930
3,860 |
|
|
307
766
1,533
3,066
4,600
6,132
7,665
15,330 |
|
|
Green
Yellow
Blue
Red
Purple
White
Black
Orange |
|
|
Rotors |
|
30847
R1, Chrome-plated Brass
30849
R2, Chrome-plated Brass
30851
R3, Chrome-plated Brass
31716
R1, 303 Stainless Steel
31718
R2, 303 Stainless Steel
31720
R3, 303 Stainless Steel
35617
R1, Closed-end, Stainless Steel
35619
R2, Closed-end, Stainless Steel
|
|
Bobs |
|
30844
B1, 303 Stainless Steel, Hollow
30843
B2, 303 Stainless Steel, Solid
30842
B3, 303 Stainless Steel, Solid
30841
B4, 303 Stainless Stell, Solid |
|
Sample Cups |
|
31203
Thermocup, 115 Volts, 50/60 Hz, 2 amps
31204
Thermocup, 230 Volts, 50/60 Hz, 1 amp
31759
Double-Wall Circulating Cup
35283
Insulated Sample Cup
30929
Stainless Steel Sample Cup |
|
Circulators |
|
35293
Heat-only Circulator, 90°- 212°F, four-liter cap., 115 Volts, 60 Hz, 1,000 Watt
35294
Refrigerated Circulator, 0°- 210°F, five-liter cap., 115 Volts, 60 Hz. Heater Capacity 1,000 Watt
|
|
Calibration |
|
31517 DW3 Dead Weight Calibration Fixture
28696
Calibration Reference Fluid, 10 cP, 16 oz (475 ml)
28691
Calibration Reference Fluid, 20 cP, 16 oz (475 ml)
28692
Calibration Reference Fluid, 50 cP, 16 oz (475 ml)
28693
Calibration Reference Fluid, 100 cP, 16 oz (475 ml)
28694
Calibration Reference Fluid, 200 cP, 16 oz (475 ml)
28695
Calibration Reference Fluid, 500 cP, 16 oz (475 ml) |
|
Section 11: Parts List
1 30985 Zeroing Sleeve
2 30973 Dust Cap
3 30986 Clamp Sleeve (2)
4 30752 Spring Ass'y. F-1
5 30924 Spring Bushing
6 30975 Lens
7 30793 Housing Cover Ass'y.
8 30862 Pointer
9 30999 Plug Screw
10 31637 Gear Housing
11 30723 Bob Shaft & Dial Ass'y.
12 30027 Retainer
13 31899 Shim
14 30920 Main Shaft Gear
15 30804 Main Shaft Key
16 31546 Retainer (2)
17 31775 Main Shaft
18 30729 Bearing (2)
19 30732 Bearing (2)
20 30912 Bearing Shield
21 L4982 Retainer
22 30887 Splash Guard
23 30847 Rotor R-1
24 30844 Bob B-1
25 30988 Clamp Nut
26 30989 Clamp Spacer
27 30977 Clamp Screw
28 30054 Drive Shaft Tube
29 30991 Support Rod (2)
30 30984 Stop Collar
31 30713 Bearing
32 30935 Drive Shaft Gear (35A)
33 30934 Drive Shaft Gear (35SA)
34 L4511 O-Ring
35 30726 Stage
36 32426 Capacitor
37 30741 Base (35A)
38 30170 Base (35SA)
39 30743 Cover Plate
40 30797 Name Plate (35A)
41 30796 Name Plate (35SA)
42 L7213 Rubber Feet (4)
43 30822 Shift Rod Ass'y.
44 30987 Detent Spring
45 30983 Gel Knob
46 30734 Bushing
47 31271 Balls (6)
48 31400 Washer
49 30913 Upper Change Gear
50 31771 Worm Gear
51 30917 Lower Change Gear
52 31794 Temp. Warning Tag
53 30922 Bearing
54 30795 Speed Selection Tag
55 30928 Cluster Gear
56 30717 Jack Shaft Ass'y.
56a 30716 Worm
56b 30715 Washer
|
Table 1: Six-Speed Testing Combinations
TABLE 1
Six-Speed Testing Combinations
Model 35A and Model 35SA
|
Speed RPM |
Viscometer Switch |
Gear Knob |
|
600 |
High |
Down |
|
300 |
Low |
Down |
|
200 |
High |
Up |
|
100 |
Low |
Up |
|
6 |
High |
Center |
|
3 |
Low |
Center |
|
Table 2: Twelve-Speed Testing Combinations
TABLE 2
Twelve-Speed Testing Combinations
Model 35A/SR12 and Model 35SA/SR12
|
RPM |
Gear Box Lever |
Speed Switch |
Viscometer Gear Knob |
|
600 |
Left |
High |
Down |
|
300 |
Left |
Low |
Down |
|
200 |
Left |
High |
Up |
|
180 |
Right |
High |
Down |
|
100 |
Left |
Low |
Up |
|
90 |
Right |
Low |
Down |
|
60 |
Right |
High |
Up |
|
30 |
Right |
Low |
Up |
|
6 |
Left |
High |
Center |
|
3 |
Left |
Low |
Center |
|
1.8 |
Right |
High |
Center |
|
0.9 |
Right |
Low |
Center |
|
Table 3: Dial Defection for Calibration Weights and Torsion Spring Assemblies
TABLE 3
Dial Deflection for Calibration Weights And Torsion Spring Assemblies
|
Torsion Spring Assembly (with R1-B1 combination) |
Torsion Spring Constant, K1 Dynes/cm/° def |
Weight in Grams |
| |
|
10 |
20 |
50 |
100 |
200 |
| |
|
Dial Reading |
|
F-0.2 |
77.2 |
127.0 |
254.0 |
- |
- |
- |
|
F-0.5 |
193.0 |
50.8 |
101.6 |
254.0 |
- |
- |
|
F-1 |
386.0 |
25.4 |
50.8 |
127.0 |
254.0 |
- |
|
F-2 |
772.0 |
- |
25.4 |
63.5 |
127.0 |
254.0 |
|
F-3 |
1158.0 |
- |
- |
43.0 |
84.7 |
169.4 |
|
F-4 |
1544.0 |
- |
- |
- |
63.5 |
127.0 |
|
F-5 |
1930.0 |
- |
- |
- |
50.8 |
101.6 |
|
F-10 |
3860.0 |
- |
- |
- |
- |
50.8 |
|
Table 4: Calculated C Values from Rotor-Bob Dimensions
TABLE 4
Calculated C Values from Rotor-Bob Dimensions
|
RPM |
Gear Box Lever |
Speed Switch |
Viscometer Gear Knob |
|
600 |
Left |
High |
Down |
|
300 |
Left |
Low |
Down |
|
200 |
Left |
High |
Up |
|
180 |
Right |
High |
Down |
|
100 |
Left |
Low |
Up |
|
90 |
Right |
Low |
Down |
|
60 |
Right |
High |
Up |
|
30 |
Right |
Low |
Up |
|
6 |
Left |
High |
Center |
|
3 |
Left |
Low |
Center |
|
1.8 |
Right |
High |
Center |
|
0.9 |
Right |
Low |
Center |
|
Tabel 5: Speed Factor S Base 300 rpm = 1
TABLE 5
Speed Factor S Base 300 rpm = 1
|
Torsion Spring Assembly (with R1-B1 combination) |
Torsion Spring Constant, K1 Dynes/cm/° def |
Weight in Grams |
| |
|
10 |
20 |
50 |
100 |
200 |
| |
|
Dial Reading |
|
F-0.2 |
77.2 |
127.0 |
254.0 |
- |
- |
- |
|
F-0.5 |
193.0 |
50.8 |
101.6 |
254.0 |
- |
- |
|
F-1 |
386.0 |
25.4 |
50.8 |
127.0 |
254.0 |
- |
|
F-2 |
772.0 |
- |
25.4 |
63.5 |
127.0 |
254.0 |
|
F-3 |
1158.0 |
- |
- |
43.0 |
84.7 |
169.4 |
|
F-4 |
1544.0 |
- |
- |
- |
63.5 |
127.0 |
|
F-5 |
1930.0 |
- |
- |
- |
50.8 |
101.6 |
|
F-10 |
3860.0 |
- |
- |
- |
- |
50.8 |
|
Table 6: Measuring Range for FANN Direct Indicating Viscometer
|
Measuring Range for FANN Model 35 Viscometers
|
|
ROTOR-BOB |
R1 B1 |
R2 B1 |
R3 B1 |
R1 B2 |
R1 B3 |
R1 B4 |
|
BASIC DATA |
|
Rotor Radius, Ro, cm |
1.8415 |
1.7588 |
2.5866 |
1.8415 |
1.8415 |
1.8415 |
|
Bob Radius, Rj, cm |
1.7245 |
1.7245 |
1.7245 |
1.2276 |
0.8622 |
0.8622 |
|
Bob Height, L, cm |
3.800 |
3.800 |
3.800 |
3.800 |
3.800 |
1.900 |
|
Shear Gap, in Annulus, cm |
0.1170 |
0.0343 |
0.8261 |
0.6139 |
0.9793 |
0.9793 |
|
Radii Ratio, Rj / Ro |
0.9365 |
0.9805 |
0.667 |
0.666 |
0.468 |
0.468 |
|
Maximum Use Temperature, oC |
93 |
93 |
93 |
93 |
93 |
93 |
|
Minimum Use Temperature, oC |
0 |
0 |
0 |
0 |
0 |
0 |
|
Overall Instrument Constant, K |
300.0 |
94.18 |
1355 |
2672 |
7620 |
15,200 |
|
Standard F1 Torsion Spring
h= Kfq/N
|
|
SHEAR STRESS RANGE |
|
Shear Stress Constant for Effective |
|
Bob Surface k2, cm-3 |
0.01323 |
0.01323 |
0.01323 |
0.0261 |
0.0529 |
0.106 |
|
Shear Stress Range, dynes/cm2g
= k1k2q
|
|
F 0.2 q
= 1o |
1.02 |
1.02 |
1.02 |
2.01 |
4.1 |
8.2 |
|
F 0.2 q
= 300o |
307 |
307 |
307 |
605 |
1225 |
2450 |
|
F 0.5 q
= 1o |
2.56 |
2.56 |
2.56 |
5.04 |
10.2 |
20.4 |
|
F 0.5q
= 300o |
766 |
766 |
766 |
1510 |
3060 |
6140 |
|
F1 q
= 1o |
5.11 |
5.11 |
5.11 |
10.1 |
20.4 |
40.9 |
|
F1 q
= 300o |
1533 |
1533 |
1533 |
3022 |
6125 |
12,300 |
|
F2 q
= 1o |
10.22 |
10.22 |
10.22 |
20.1 |
40.8 |
81.8 |
|
F2 q
= 300o |
3066 |
3066 |
3066 |
6044 |
12,250 |
24,500 |
|
F3 q
= 1o |
15.3 |
15.3 |
15.3 |
30.2 |
61.3 |
123 |
|
F3 q
= 300o |
4600 |
4600 |
4600 |
9067 |
18,400 |
36,800 |
|
F4 q
= 1o |
20.4 |
20.4 |
20.4 |
40.3 |
81.7 |
164 |
|
F4 q
= 300o |
6132 |
6132 |
6132 |
12,090 |
24,500 |
49,100 |
|
F5 q
= 1o |
25.6 |
25.6 |
25.6 |
50.4 |
102 |
205 |
|
F5 q
= 300o |
7665 |
7665 |
7665 |
15,100 |
30,600 |
61,400 |
|
F10 q
= 1o |
51.1 |
51.1 |
51.1 |
100.7 |
204 |
409 |
|
F10 q
= 300o |
15330 |
15330 |
15330 |
30,200 |
61,200 |
123,000 |
|
SHEAR STRESS RANGE |
|
Shear Rate Constant k3, sec-1 per rpm |
1.7023 |
5.4225 |
0.377 |
0.377 |
0.268 |
0.268 |
|
Shear Rate range, sec-1 ¡
= k3N |
|
N = 0.9 rpm |
1.5 |
4.9 |
0.4 |
0.4 |
0.24 |
0.24 |
|
N = 1.8 rpm |
3.1 |
9.8 |
0.7 |
0.7 |
0.48 |
0.48 |
|
N = 3 rpm |
5.1 |
16.3 |
1.1 |
1.1 |
0.80 |
0.80 |
|
N = 6 rpm |
10.2 |
32.5 |
2.3 |
2.3 |
1.61 |
1.61 |
|
N = 30 rpm |
51.1 |
163 |
11.3 |
11.3 |
8.0 |
8.0 |
|
N = 60 rpm |
102 |
325 |
22.6 |
22.6 |
16.1 |
16.1 |
|
N = 90 rpm |
153 |
488 |
33.9 |
33.9 |
24.1 |
24.1 |
|
N = 100 rpm |
170 |
542 |
37.7 |
37.7 |
26.8 |
26.8 |
|
N = 180 rpm |
306 |
976 |
67.9 |
67.9 |
48.2 |
48.2 |
|
N = 200 rpm |
340 |
1084 |
75.4 |
75.4 |
53.6 |
53.6 |
|
N = 300 rpm |
511 |
1627 |
113 |
113 |
80.4 |
80.4 |
|
N = 600 rpm |
1021 |
3254 |
226 |
226 |
161 |
161 |
|
VISCOSITY RANGE IN CENTIPOISE |
|
Minimum Viscosity(2) |
|
All models, 600 rpm maximum |
0.5(3) |
0.5(3) |
2.3 |
4.5 |
12.7 |
25 |
|
Maximum Viscosity(4) |
|
For Model 34A & HC34A, 300 rpm min. |
300 |
94 |
1,350 |
2,700 |
7,620 |
15,000 |
|
For Model 35A & 35SA, 3 rpm min. |
30,000 |
9,400 |
135,000 |
270,000 |
762,000 |
1,500,000 |
|
For Model 35A/SR 12 & 35SA/SR 12, 0.9 rpm min.
|
10,000 |
31,400 |
400,000 |
890,000 |
2,550,000 |
5,000,000 |
Notes:
- Computed for standard Torsion Spring (f = 1) For other torsion springs multiply viscosity range by f factor
- Minimum viscosity is computed for minimum shear stress and maximum shear rate
- For practical purposes the minimum viscosity is limited to 0.5 cP because of Taylor Vortices
- Maximum viscosity is computed for maximum shear stress and minimum shear rate
|
|
Table 7: Rotor-Bob Dimensions
TABLE 7
Rotor-Bob Dimensions
|
Unit |
r-cm |
Length-cm |
Cyl. Area-cm2 x Radius-cm |
|
B1 |
1.7245 |
3.8 |
71.005 |
|
B2 |
1.2276 |
3.8 |
35.981 |
|
B3 |
0.86225 |
3.8 |
17.751 |
|
B4 |
0.86225 |
1.9 |
8.876 |
|
R1 |
1.8415 |
|
|
|
R2 |
1.7589 |
|
|
|
R3 |
2.5867 |
|
|
|
Figure 1: Model 35 Viscometer
Figure 1
Model 35 Viscometer
|
Figure 2: Model SR-12 Gear Box
Figure 2
Gear Box Lever
|
Figure 3: Rotor Removal/Installation
Figure No. 3
Rotor Removal/Installation
|
Figure 4: Torsion Spring Removal and Replacement
Figure No. 4
Torsion Spring Removal and Replacement
|
Figure 5: Dead Weight Calibration Check
Figure No. 4
Dead Weight Calibration
DW-3 Calibration Fixture
|
Figure 6: Model 35 Parts Identification
Figure 6
Model 35A and Model 35SA Parts Identification
 |
Fann makes the most widely
used coaxial cylinder viscometers inthe world!
|
