New Products - FANN®

Model 35 Viscometer

Viscometer Model 35Widely known as the Standard of the Industry for drilling fluid viscosity measurements

Fann produces a range of true Couette coaxial cylinder rotational viscometers. The Model 35 Viscometer is the best known and most commonly used Fann viscometer.

The test fluid is contained in the annular space or shear gap between the cylinders. Rotation of the outer cylinder at known velocities is accomplished through precision gearing. The viscous drag exerted by the fluid creates a torque on the inner cylinder or bob. This torque is transmitted to a precision spring where its deflection is measured and then related to the test conditions and instrument constants.

This system permits the true simulation of most significant flow process conditions encountered in industrial processing.

Direct Indicating Viscometers combine accuracy with simplicity of design, and are recommended for evaluating materials that are Bingham plastics. Model 35 Viscometers are equipped with factory installed R1 Rotor Sleeve, B1 Bob, F1 Torsion Spring, and a stainless steel sample cup for testing according to American Petroleum Institute Specification RP 13B.

Other rotor-bob combinations and/or torsion springs can be substituted to extend the torque measuring range or to increase the sensitivity of the torque measurement. Shear stress is read directly from a calibrated scale. Plastic viscosity and yield point of a fluid can be determined easily by making two simple subtractions from the observed data when the instrument is used with the R1-B1 combination and the standard F1 torsion spring.

A wide range of accessories are available for the Model 35 Viscometer.


The Model 35 Viscometer has been evaluated for compliance, and fulfills the requirements of EN 61010-1:2010, CAN/CSA C22.2 No. 61010-1-2012 and UL61010-2-030:2012.

A copy of this Declaration of Conformity is available upon request.


 Ordering Information and Specifications

Six speed viscometers have speeds of 600, 300, 200, 100, 6, and 3 rpm

Twelve speed viscometers have speeds of 600, 300, 200, 180, 100, 90, 60, 30, 6, 3, 1.8, and 0.9 rpm

Part No. Model No. # of Speeds Voltage
207198 35A 6 115 Volts 60 HZ
207199 35SA 6 115 Volts 50 HZ
207200 35A/SR-12 12 115 Volts 60 HZ
207201 35SA/SR-12 12 115 Volts 50 HZ
101671767 35SA/SR-12 with Case and Transformer 12 115 Volts 50 HZ
101671768 35A with Case 6 115 Volts 60 HZ
101671770 35SA with Case and Transformer 6 115 Volts 50 HZ
101671771 35SA/SR-12 with Case 12 115 Volts 60 HZ

Model 35 Viscometer

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  TitleНазвание  DateДата
Summary Summary Model 35 Viscometer Calibration
Calibration information for Fann Model 35 Viscometer
Summary Summary Microsoft Word - Yield Stress Adapter _YSA_.doc
Yield Stress Adapter accesory for Model 35 Viscometer
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Summary Summary Rheology - Its Importance Today
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Model 35 Direct Indicating Viscometer
Summary Summary Torsion Springs Constants for Model 35 Viscometer
Torsion Spring Constants
Summary Summary Viscometer Model 35 Accessories
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Summary Summary Viscometer Model 35
Fann Model 35 viscometers are direct reading instruments 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. Model 35 viscometers are Couette coaxial cylinder rotational viscometers.
Summary Summary VISCOMETER MODEL 35A - 206364 - 1 Year Spares
Summary Summary Calibration Fluids Shelf Life
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Summary Summary Viscometer Model 35 Accessories