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Summary of Contents for fann 280
- Page 1 Rheometer Calibration Fixture Instruction Manual Model 280 & 286 Instruction Manual Part No. 204210 Revision B...
- Page 2 Fann Instrument Company, Houston, Texas, U.S.A. Printed in U.S.A. NOTE Fann reserves the right to make improvements in design, construction and appearance of our products without prior notice. ® FANN is a registered trademark of Fann Instrument Company.
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Page 3: Table Of Contents
TABLE OF CONTENTS Section Page Description ........................1 Calibration Check Procedure Rheometer ..............3 Spring Calibration Procedure Model 280 Rheometer ..........7 Spring Calibration Procedure Model 286 Rheometer ..........11 Parts List .........................15 Table Calibration Weight vs Dial Reading ................4 Figure Typical Torsion Shaft Assembly ................5 Model 280 Set Up .....................6... -
Page 4: Description
The Rheometer Calibration Fixture is designed for calibration verification and calibration adjustment of the torsion spring in either the Model 280 or the Model 286 Rheometers. This instruction describes checking and adjusting the strength of the torsion spring such that a known torque will produce a known deflection, (dial reading). -
Page 6: Calibration Check Procedure Rheometer
(Refer to Fig. 2 for Model 280 and Fig. 3 for Model 286) Route the thread over the sheave, and allow it to hang. Make sure the thread does not lap over itself on the spool. -
Page 7: Calibration Weight Vs Dial Reading
Take readings as shown in the Table 1. TABLE 1 WEIGHT DIAL READING 25 GRAMS 103-104 50 GRAMS 204-206 75 GRAMS 309-312... -
Page 8: Typical Torsion Shaft Assembly
Fig. 1 Typical Torsion Shaft Assembly... -
Page 9: Model 280 Set Up
Fig. 2 Model 280 Set Up... -
Page 10: Spring Calibration Procedure Model 280 Rheometer
SECTION 3 SPRING CALIBRATION PROCEDURE MODEL 280 RHEOMETER This procedure requires the removal of the Torsion Shaft Assembly, shown in Fig.1, from the Rheometer, and mounting it in the Calibration Fixture. Torsion Shaft Assembly Removal Unscrew and remove the Sleeve, Bob, and Dust Shield from the Rheometer. - Page 11 [64] against spring [67]. and collet 67- Mounting Torsion Shaft Assembly in the Calibration Fixture. Re-assemble the Calibration Fixture and set it up for the Model 280 torsion shaft assembly. (Refer to Fig. 2).
- Page 12 Push upper spring collet [67-2] into torsion assembly body [61] and lock it with hex set screw [81-B] in a position so that dial zero aligns with the hairline. Check calibration as described in Section 3D above. If still incorrect, repeat this section.
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Page 13: Model 286 Set Up
Fig.3 Model 286 Set Up... -
Page 14: Spring Calibration Procedure Model 286 Rheometer
SECTION 4 SPRING CALIBRATION PROCEDURE MODEL 286 RHEOMETER This procedure requires the removal of the Torsion Shaft Assembly, shown in Fig.1, from the Rheometer, and mounting it in the Calibration Fixture. Torsion Shaft Assembly Removal Disconnect the Rheometer from the power source. Unscrew and remove the Sleeve, Bob, and Dust shield from the Rheometer. - Page 15 Remove the large retainer ring on top of the Torsion Body. Lift the torsion shaft assembly up and out of the Rheometer frame. Preliminary Spring Setting A preliminary setting of the torsion spring should be made prior to mounting it in the fixture. Make this setting as follows: Set the torsion spring assembly for approximately 9-1/4 to 9-1/2 active pair turns by rotating the outer collet [67-3] on spring [67] to the proper point.
- Page 16 Taking the Readings Hang the 25, 50 and 75 Gram weights each in turn on the loop in the end if the thread and note the dial readings obtained. (Refer to Table 1). If the dial readings are higher than shown in Table 1 - shorten the active part of the spring.
- Page 17 Make sure all holes in the circuit board are in line and nothing is binding the circuit board as it is assembled into place. Make sure the two top mounting holes are in line and the holes for the power transistor and voltage regulator are in line.
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Page 18: Parts List
SECTION 5 PARTS LIST Calibration Stand Parts List Part No. Description 207096 Weights, 25 grams & 50 grams 207849 Thread 204210 Instructions 205683 Bearing, bob shaft Optional Calibration Fluids PART NO. DESCRIPTION 207124 Calibration Fluid 10 cP 207119 Calibration Fluid 20 cP 207120 Calibration Fluid 50 cP 207121... - Page 19 For your protection, items being returned must be carefully packed to prevent damage in shipment and insured against possible damage or loss. Fann will not be responsible for damage resulting from careless or insufficient packing.