OfiTE 800 Manuale utente
Model 800 Viscometer
#130-10-C/#130-11-C - With Carrying Case and Power Supply
#130-10-L - With Retractable Legs (For Kits)
Instruction Manual
Updated 3/16/2022
Ver. 11
OFI Testing Equipment, Inc.
11302 Steeplecrest Dr. · Houston, Texas · 77065 · U.S.A.
Tele: 832.320.7300 · Fax: 713.880.9886 · www.ote.com
©Copyright OFITE 2015
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 1
Introduction.....................................................................................2
Description......................................................................................2
Components ...................................................................................3
Specications .................................................................................5
Safety...............................................................................................8
Setup.............................................................................................. 11
Calibration.....................................................................................12
Operation.......................................................................................15
Calculations ..................................................................................17
Disassembly .................................................................................17
Maintenance..................................................................................18
Warranty and Return Policy ........................................................23
Table of
Contents
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 2
The Model 800 8-Speed Electronic Viscometer is designed and exclusively
manufactured by OFI Testing Equipment, Inc. It is extensively used worldwide
in both the eld and laboratory for the precise measurement of rheological
properties of uids.
The OFITE Model 800 Viscometer determines the ow characteristics of oils
and drilling uids in terms of shear rate and shear stress over various time
and temperature ranges at atmospheric pressure. Speeds are easily changed
with a control knob, and shear stress values are displayed on a lighted
magnied dial for ease of reading.
The viscometer’s motor RPM is continuously monitored and automatically
adjusted by the OFITE Pulse-Power electronic speed regulator to maintain
a constant shear rate under varying input power and drilling uid shear
conditions. The eight precisely regulated test speeds (shear rates in RPM)
are as follows: 3 (Gel), 6, 30, 60, 100, 200, 300, and 600. A higher stirring
speed is also provided. Speeds may be changed with a control knob
selection, without stopping the motor.
The Model 800 is suitable for both eld and laboratory use and uses a
motor-driven electronic package to provide drilling uid engineers with
an extremely accurate and versatile tool. The Model 800 operates from a
13–16 VDC power source. The electronic regulator continuously monitors
and automatically adjusts the rotational speed to maintain a constant shear
rate under varying uid shear conditions and input power variations that are
commonly found on-site.
Introduction
Description
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 3
#130-10 Model 800 8-Speed Viscometer
#130-10-2 Speed Reference PC Board (For 130-10 Model Only)
#130-10-3 Speed Control PC Board (For 130-10 Model Only)
#130-10-5 Switch Plate
#130-10-6 Wiring Harness
#130-10-8-1 Encoder Disc
#130-10-14 Motor (For 130-10 Model Only)
#130-10-16 Belt
#130-10-17 Cover
#130-10-18 Lens for Cover
#130-10-20 Torsion Shaft
#130-10-22 Card Guide for PC Boards
#130-10-61 Light Assembly
#130-21 Cup, Stainless Steel
#130-76-28 Motor (For 130-11 Model Only)
#132-50 Rotor Drive
#132-56 Rotor Sleeve, R1, 303 Stainless Steel
#132-57 Shield
#132-58 Bob, B1, 303 Stainless Steel
#132-59 Bearing Retainer
#132-71 Bearing
#132-74 Locking Ring, 1.653"
#132-75 Locking Ring, ½"
#132-76 Locking Ring, "
#134-05-2 Shielded Bearing for Bob Shaft
#134-10 Torsion Spring Assy, F1
#134-39 Clamp Sleeve for Torsion Spring
#134-40 Shim, ⅝" × ⅜"
#135-02 External Retainer Ring
#135-18 Socket Set Screw
#142-63 Locking Screw
#163-26 Small Clip
#170-21 Stand Support Rod
#170-44 Rubber Foot, ½"
#171-32 Midget Knob
Case:
#130-10-13-5 Carrying Case with Custom Foam Insert (For 130-10 Only)
#130-11-13-5 Carrying Case with Custom Foam Insert (For 130-11 Only)
Components
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 4
Optional:
#132-56-C R1 Closed-Cup Rotor; 316 Stainless Steel (For completion and
fracturing uid testing.)
#130-45-1 Calibration Instrument
#132-80 Calibration Fluid, Certied, 100 cP, 16 oz
Additional Bobs, Sleeves, and Springs:
#132-58-1 B2 Bob, 303 Stainless Steel
#132-58-2 B3 Bob, 303 Stainless Steel
#132-58-3 B4 Bob, 303 Stainless Steel
#132-58-4 B5 Bob, 303 Stainless Steel
#132-58H B1 Bob, Hastelloy®
#132-56H R1 Sleeve, Hastelloy®
#134-10-2 F0.2 Torsion Spring Assembly (Green)
#134-10-3 F0.5 Torsion Spring Assembly (Yellow)
#134-10-4 F2.0 Torsion Spring Assembly (Red)
#134-10-5 F3.0 Torsion Spring Assembly (Purple)
#134-10-6 F4.0 Torsion Spring Assembly (White)
#130-10-SP One Year Spare Parts
#130-10-18 Lens for Cover
#130-10-503 Fuse, 4 Amp, Qty: 4
#130-10-61 Light Assembly
#130-48 Retaining Ring Pliers, Internal
#130-76-47 Retaining Ring Pliers, External
#132-59 Bearing Retainer
#132-71 Bearing, Qty: 2
#132-75 Locking Ring, ½"
#132-80 Calibration Fluid, 100 cP, 16 oz
#132-81 Calibration Fluid, 50 cP, 16 oz
#134-05-2 Shielded Bearing for Bob Shaft, Qty: 4
#134-10 Torsion Spring Assy, F1
#135-02 External Retainer Ring, Qty: 2
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 5
Specications Instrument Geometry True Couette Coaxial Cylinder
Speed Accuracy (RPM) .1
Motor Speeds (RPM) 8 Fixed Speeds (600, 300, 200, 100, 60,
30, 6, and 3)
Readout Direct Dial
Power Requirements 13 – 16 VDC
Weight (kg) 6.0
Dimensions (cm) 15.2 × 17.8 × 40.6
Shipping Weight (kg) 20.4
Shipping Dimensions (cm) 55.9 × 25.4 × 40.6
Range of Measurement for Model 800
Rotor - Bob R1B1 R1B2 R1B3 R1B4 R1B5
Rotor Radius, RR, (cm) 1.8415 1.8415 1.8415 1.8415 1.8415
Bob Radius, RB, (cm) 1.7245 1.2276 0.8622 0.8622 1.5987
Bob Height, L, (cm) 3.8 3.8 3.8 1.9 3.8
Shear Gap, (cm) 0.117 0.6139 0.9793 0.9793 0.2428
R Ratio, RB/RR 0.9365 0.666 0.468 0.468 0.8681
Shear Rate Constant kR(sec-1
per RPM) 1.7023 0.377 0.2682 0.2682 0.8503
Shear Stress Constant for
Eective Bob Surface kS(cm-3)0.01323 0.02610 0.05290 0.10600 0.01541
Overall Instrument Constant,
K, with Standard F1.0 Spring,
ŋ=KfƟ/N
300 2,672 7,620 15,200 349
Max. Shear Stress,
SSMAX, (Dyne / cm2)
Constant
kT
R1B1 R1B2 R1B3 R1B4 R1B5
F 0.2 (Green) 77.2 330 651 1,320 2,644 384
F 0.5 (Yellow) 193 840 1,657 3,359 6,730 977
F 1.0 (Blue) 386 1,680 3,314 6,717 13,460 1,955
F 2.0 (Red) 772 3,360 6,629 13,435 26,921 3,910
F 3.0 (Purple) 1,158 5,040 9,943 20,152 40,381 5,865
F 4.0 (White) 1,544 6,720 13,257 26,870 53,841 7,819
F 5.0 (Black) 1,930 840 16,571 33,587 67,302 9,774
F 10.0 (Orange) 3,860 16,800 33,143 67,175 134,603 19,548
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 6
Shear Rate Range R1B1 R1B2 R1B3 R1B4 R1B5
Shear Rate Constant, KR,
(sec-1 per RPM) 1.7023 0.3770 0.2682 0.2682 0.8503
Shear Rate, (sec-1 or 1/s)
3 RPM 5.11 1.13 0.80 0.80 2.56
6 RPM 10.21 2.26 1.61 1.61 5.11
30 RPM 51.07 11.31 8.05 8.05 25.54
60 RPM 102.14 22.62 16.09 16.09 51.07
100 RPM 170.23 37.70 26.82 26.82 85.12
200 RPM 340.46 75.40 53.64 53.64 170.23
300 RPM 510.69 113.10 80.46 80.46 255.35
600 RPM 1021.38 226.20 160.92 160.92 510.69
Viscosity Ranges<a>
(cP) R1B1 R1B2 R1B3 R1B4 R1B5
Minimum Viscosity<b>
@600 RPM 0.5<c> 4.5 12.7 25 1.2
Maximum Viscosity<d>
@3 RPM 33,000 293,920 838,200 1,672,000 38,390
<a> Computed for standard Torsion Spring (F 1.0). For other torsion springs, multiply by F factor.
<b> Lower viscosities can be measured by the Model 800, however one must take into account the
eect of bearing drag, Taylor vortices, zero oset, etc. when looking at the expected accuracy of the
reading.
<c> For practical purposes the minimum viscosity is limited to 0.5 cP due to Taylor Vortices.
<d> Maximum viscosity is based on Maximum Shear Stress and Minimum shear rate (RPM). However,
due to practical and physical limitations, it may be dicult to take these measurements.
Shear Stress Conversions
To convert from units on left side to units on top, multiply by factor @ intercept.
Centipoise
(cP) Poise (P) g/(cm*s) (mN*s)m2mPa*s (lb*s)
100 ft2
Centipoise
(cP) 1 0.01 0.01 1 1 0.002088
Poise (P) 100 1 100 100 100 0.2088
g/(cm*s) 100 1 100 100 100 0.2088
(mN*s)m21 0.01 0.01 1 1 0.002088
mPa*s 1 0.01 0.01 1 1 0.002088
(lb*s)
100 ft2478.93 4.789 4.789 478.93 478.93 1
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 7
Shear Stress Conversions
To convert from units on left side to units on top, multiply by factor @ intercept.
Dyne/cm2Pa lb/100ft2lb/ft2DR
Dyne/cm21 0.1 0.2084 0.002084 0.1957
Pa 10 1 2.084 0.02084 1.957
lb/100ft24.788 0.4788 1 0.01 0.939
lb/ft2478.8 47.88 100 1 93.9
DR 5.107 0.5107 1.065 0.01065 1
What Bob & Spring Should I Use?
There is often confusion or misunderstanding about what a viscometer can
actually measure. For example, a viscometer with an R1 B1 F1 combination
can measure water fairly well at 100 RPM and higher, but at 3 RPM, the
readings would be shaky at best. While on the other hand, a linear uid with a
viscosity of 15,000, could not get past 6 RPM with the same combination.
To estimate which spring might be best, use the formula below to calculate a
Minimum Spring factor, where one establishes the maximum RPM the uid
is going to be tested at, as well as what the expected “Apparent Viscosity”
of the uid at that RPM. If the Factor comes out as .87, then an F 1.0 spring
should be used. If it comes out as .16, then an F 0.2 spring would be best. To
cover all ranges, it may be necessary to use more than one spring.
Minimum Spring Factor (F) = RPM(max) * AV(max)
BOB(F)*90,000
Bob (F)
R1B1 1.0
R1B2 8.9
R1B3 25.4
R1B4 50.7
R1B5 2.4
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 8
Safety
Explanation of Symbols
Caution: Risk of Danger - This symbol directs the operator to consult the
instruction manual for safety related warnings. (ISO-7000-0434)
Whenever this symbol is used on the equipment, the user must
consult the manual to determine the nature of the hazard and any
actions which have to be taken.
Fuse: This is the internationally recognized symbol for a user-replaceable
fuse. This symbol will be followed by information required to guide the
user to choose the proper replacement fuse.
Direct Current (DC): This symbol indicates an input (or output) that is
direct current only. (IEC 60417-5013)
Note: This symbol will indicate important notes and helpful hints for the
operation of the equipment.
Polarity: This symbol indicates that the equipment receives positive
voltage on the center pin of the connector and the return voltage is on the
outer case.
Tip: This symbol is used to identify operational information and best
practices to obtain the most reliable data.
Caution: Note - This symbol is used to indicate statements in the manual
which warn against actions which may cause damage to the equipment
during routine service or maintenance
OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 9
Electrical Requirements
The Model 800 Viscometer is to be powered by a DC power source. The
power supply for the #130-10 Model is capable of providing between 13
and 16 volts DC. The power supply for the #130-11 Model supplies 24 volts
DC. The equipment is current limited to 4 amps by a user-replaceable fuse.
However, we suggest that the power supply be current limited to less than 4
amps to provide additional protection to the equipment.
Power (On/O) Switch
Input Connector:
13 – 16 VDC Power
Inlet / Emergency
Disconnect Device
Power (On/O) Switch
Input Connector:
24 VDC Power
Inlet / Emergency
Disconnect Device
When connecting the equipment to your power source, make sure that the
13-16 VDC is connected to the center pin of the connector.
The equipment is supplied with a user-replaceable fuse. This fuse must only
be replaced by a 250-volt, 4-amp, time-delayed fuse.
Environmental Conditions
The equipment is designed for use in normal environmental conditions:
- Indoors
- At or below an altitude of 2,000 m (6,562 ft)
- In temperatures between 5° and 40°C (41°–104°F)
- With a maximum relative humidity of 80% for temperatures up to 31°C
(88°F) decreasing linearly to 50% relative humidity at 40°C (104°F)
- This equipment has not been rated according to IEC 60529
Installation
The Model 800 Viscometer should be used in a location where it will not be
subjected to excessive moisture. It should be placed on a at, stable surface
in a well-ventilated environment.
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