fann 35A User Manual

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Model 35 Viscometer

Instruction Manual

Manual No. 208878, Revision N

Models 35A, 35SA, 35A/SR-12, and 35SA/SR-12

Table of Contents

Questions and Answers:

L
Linda AndersonAug 3, 2025
Why are my Fann Measuring Instruments out of calibration?
- D
  David ZamoraAug 3, 2025
  If your Fann Measuring Instruments are out of calibration, it could be due to several reasons. Contaminated bob shaft bearings can cause this, and the solution is to replace the bob shaft bearings (P/N 207450). A bent bob shaft can also be the culprit; try to slightly bend the shaft to straighten it, or contact Fann for repair or replacement. Other possible causes include a bent rotor (replace the rotor), a damaged or incorrectly installed torsion spring (refer to Section 5.4 to replace the torsion spring), or an incorrect motor speed (replace the motor with P/N 207446 or 207447).
B
brookefergusonAug 11, 2025
What to do if my Fann Measuring Instruments have erratic dial motion?
- A
  angela28Aug 11, 2025
  Erratic dial motion in Fann Measuring Instruments can stem from a few issues. One potential cause is contaminated bob shaft bearings, which can be resolved by replacing the bob shaft bearings (P/N 207450). Another cause might be a bent bob shaft; in this case, try bending the shaft slightly to straighten it, or contact Fann for repair or replacement. Finally, a rotor out of alignment or damage to the rotor can also lead to erratic dial motion, so replace the rotor if necessary (refer to Table 9-1 for a list of rotors).
P
Phillip PottsAug 18, 2025
What causes excessive run-out of rotor in Fann Measuring Instruments?
- L
  Lisa PottsAug 18, 2025
  Excessive run-out of the rotor in Fann Measuring Instruments can be caused by a damaged rotor, which requires replacement (refer to Table 9-1). Another potential cause is contamination in the main shaft recess, in which case you should contact Fann for repair.
C
Chelsea Williams DDSAug 25, 2025
How to fix excessive noise in Fann Measuring Instruments?
- L
  Laura ColemanAug 26, 2025
  Excessive noise in Fann Measuring Instruments may be due to lubrication failure or contamination in the gears, in which case you should contact Fann for repair. It could also be caused by a worn center thrust washer, which also requires you to contact Fann for repair. Another possible cause is that the top cover is not set properly; try adjusting the top cover.

fann 35A Specifications

General

Brand	fann
Model	35A
Category	Measuring Instruments
Language	English

Summary

Introduction to the Model 35 Viscometer

Background of Viscometer Operation

Describes the fundamental principles of Couette rotational viscometers and how viscosity is measured.

Document Conventions Explained

Explains the icons used in the manual for notes, cautions, and warnings.

Safety Precautions for Viscometer Use

Safe Electrical Operation Guidelines

Details precautions for operating the viscometer safely, focusing on electrical hazards.

Standard B1 Bob Usage Limitations

Information on the limitations of the standard B1 Bob for testing hot samples.

Heated Sample Cup Safety

Safety guidelines for using heated sample cups, including hand protection and temperature limits.

Model 35 Viscometer Features and Specifications

Installation Procedures for the Viscometer

Operating the Fann Model 35 Viscometer

Operating the Model 35A and 35SA

Instructions for operating the six-speed models, including speed selection and gear shift.

Operating the Model 35A/SR-12 and 35SA/SR-12

Instructions for operating the twelve-speed models, including gear box shift lever usage.

Measuring Gel Strength

Procedures for measuring gel strength using two different methods with the viscometer.

Changing Rotors, Bobs, and Torsion Springs

Guidance on removing and replacing rotors, bobs, and torsion springs, including calibration notes.

Instrument Calibration Checks

Dead Weight Calibration Procedure

Procedure for calibrating the viscometer using the DW3 Calibration Kit and weights.

Fluid Calibration Check Method

Method for checking calibration using certified Newtonian calibration fluids.

Torsion Spring Calibration

Detailed steps for adjusting or calibrating the torsion spring assembly.

Test Analysis and Calculations

Newtonian Viscosity Calculation

Formula and steps to calculate Newtonian viscosity using viscometer readings and factors.

Plastic Viscosity and Yield Point Calculation

Equations and procedure for determining plastic viscosity and yield point from test data.

Spring Constant Calculation Method

Method for calculating the spring constant, applicable to dead weight calibration.

Additional Viscosity Calculation Formulas

Presents formulas for calculating viscosity using different constants and factors.

Viscometer Measuring Ranges

Lists the measuring ranges for shear stress, shear rate, and viscosity.

Troubleshooting and Maintenance Guide

Troubleshooting Common Issues

A guide to diagnosing and correcting common problems with the viscometer.

Viscometer Maintenance Recommendations

Recommendations for proper care and servicing of the viscometer.

Available Viscometer Accessories

Model 35 Viscometer Parts List

Warranty and Returns Information

Product Warranty Details

Details the manufacturer's warranty period and conditions for products.

Item Returns Procedure

Outlines the procedure and requirements for returning items for service or repair.

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