Descriptions, ranges and measurement parameters of Brookfield viscometers and accessories

The purpose of this document is to provide the user of Brookfield viscometers and their accessories with all the information necessary to perform mathematical analyzes of viscosity data obtained using our equipment. This section includes the important characteristics of the mobiles, the measurement ranges and the constants organized by product and presented in the form of tables. The following Brookfield viscometers and accessories are covered:

• A.1 Analogue reading viscometer
• A.2 Viscometer / rheometer with digital reading
• A.3 Wells Brookfield Cone / Plane Viscometer / Rheometer
• A.4 CAP viscometer
• A.5 PVS rheometer
• A.6 Disc-shaped mobiles
• A.7 Cylindrical mobiles
• A.8 Thermosel system
• A.9 SSA Low Volume Adapter
• A.10 ULA low viscosity adapter
• A.11 DIN adapter
• A.12 Helipath system
• A.13 Spiral adapter
• A.14 Krebs viscometer

Calibrated torsion powers of viscometers with analog reading and viscometers and rheometers with digital reading.

LV 673.7 dyne-centimeters (full scale)

RV 7187.0 dyne-centimeters (full scale)

HA 14374.0 dyne-centimeters (full scale)

HB 57496.0 dyne-centimeters (full scale)

Notes:

• These values apply to all models with the same prefix: LV refers to models LVF, LVT, LVTD, LVTCP, LVTDCP, etc.
• For intermediate models, multiply the base value of the spring by the multiplier given in the model designation: 5xLVT = 5 x 673.7 = 3368.5 dynes.centimeter (full scale). The multiplier coefficients also apply to all factors and to all measurement ranges.
• The torsion recorded by the device corresponds to the reading of the % the analog or digital display multiplied by the full-scale torsion power of the viscometer divided by 100: RVT model,

reading 40; torsion = (40 x 7187.0) / 100 or torsion = 2874.8 dyne-cm.

Note concerning the expressions used in this annex:

The shear rate constants (when indicated) are multiplying coefficients to be applied to the rotational speed (in RPM) in order to obtain the shear rate (in seconds –1) for that speed. These constants are independent of the viscometer model, the viscosity of the product and / or the temperature.

The mobile factors are listed as constants in relation to the rotational speeds of the mobile. Divide the constant by the speed used to obtain the factor corresponding to the mobile / speed combination of the viscometer concerned. This factor is then used as a multiplying coefficient to obtain the viscosity (in centipoise) from the reading of % twist. For example, the factor given for the LV2 rover is 300 / N (see section A.1.4). The speed of rotation of the mobile (in RPM) is represented by N. If the measurement is carried out at 12 RPM, the factor to be applied will be 300/12 ie 25. Multiply all the torsion measurements obtained with the viscometer with this mobile combination / speed by 25 to obtain the viscosity in centipoise. Where mentioned, measuring chamber diameters represent internal diameters (ID). The diameters of the mobiles correspond to the external diameters (OD).

All dimensions are shown in millimeters and inches (in parentheses) unless otherwise stated. Be sure to use the values in millimeters when required by the rheological equations.

Number of speeds and moving parts of analog viscometers

Notes:

Variations in the speed combination (other than the standard combinations mentioned above) are identified by a suffix in the model identification: the RVT –200 model for example has a maximum speed of 200 RPM. All other speeds are in the same proportions as for standard models. The speeds of the RVT-200 model are therefore: 200, 100, 40, 20, 10, 5, 2, 1 RPM.

The speed specifications apply to all models with the same main designation: the LVT model therefore refers to models LVT, LVTD, LVT-CP, LVTDCP, etc. Each of these devices therefore has 8 speeds as indicated for the LVT model.

Please contact Labomat Essor to find out about the availability of special models (non-standard spring torsion powers and / or specific speed combinations).

Number of speeds and moving parts of digital viscometers and rheometers

Note: RV HA HB viscometers are delivered with 6 standard mobiles, mobile number 1 is optional

Disc-shaped mobiles: description and conversion factor

Conversion factors

N = RPM M = 1000

Dimensions

Dimensions are in mm (inches). Dimension A is 115 mm (4.531 inches) for LV mobiles. Dimension A is 133 mm (5.250 inches) for RV / H rovers. Dimension B is 3.2 mm (0.125 inches) for all mobiles.

Cylindrical mobiles: description and conversion factor

Conversion factors and shear rate

* N = RPM M = 1000 + = optional mobile ** The factors are given for measurements made without caliper

Dimensions

Dimensions are in mm (inches). Dimension A is 115 mm (4.531 inches) for LV mobiles. Dimension A is 133 mm (5.250 inches) for RV / H rovers. Dimension B is 3.2 mm (0.125 inches) for all mobiles.

Table of equations of cylindrical mobiles

Mobiles for Wells-Brookfield cone / plane viscometer: description, conversion factor and shear rate

Cones dimensions and shear rate

Mobiles for CAP viscometer: description, conversion factor and shear rate

Description of the PVS rheometer stator

PVS rheometer - optional geometry TA5