1、 FORD LABORATORY TEST METHOD BJ 003-02 Date Action Revisions 2001 07 23 Revised Editorial no technical change A. Cockman 1992 05 05 Printed copies are uncontrolled Page 1 of 4 Copyright 2001, Ford Global Technologies, Inc. DETERMINATION OF LOW TEMPERATURE VISCOSITY -BROOKFIELD VISCOSIMETER Applicati
2、on This procedure is intended for use in the determination by Brookfield viscosimeter of the low temperature viscosities of new and used oils. The method consists of cooling a test sample of oil in the cold bath and determining the viscosity without removing it from the cold bath. Apparatus Required
3、 (See Sketch) Freezer Cabinet Revco Model ULT 659 or equivalent, capable of maintaining temperatures to minus 80 F. Insulator Cork or wood to prevent bath from resting on bottom of freezer. Stirring Rod Thermometer For viscosity bath (+ 60 to - 80 F). Coolant Alcohol, acetone, or other low freezing
4、point liquid. Viscosity Bath 12 inch diameter by 12 inches deep. Six Station Sample Indexing Cover Plates Plexiglas Cover with Support for Brookfield Viscosimeter This item replaces one of the two pyrofoam covers of the freezer. Support Stand For stirring motor. Thermocouple (iron constantan) Immers
5、ed in test fluid sample. FORD LABORATORY TEST METHOD BJ 003-02 Page 2 of 4 Copyright 2001, Ford Global Technologies, Inc. Brookfield Viscosimeter Model No. LVF or LVT, and spindles No. 3 and No. 4, with guard. Beakers Six stainless steel sample beakers, 500 mL. Mixer Pyrometer Potentiometer Lewis, M
6、odel 14-PO, or equivalent. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise speci
7、fied. Procedure 1. Fill beakers with 275 +/- 5 mL of test fluid. 2. Heat test fluid in oven at 210 F for 30 minutes to remove any moisture present in test sample. Cool to 23 +/- 2 C. 3. Place Pyrex glass bath 12 inch diameter by 12 inch, into cold cabinet on insulator spacer. Adjust the height so th
8、e top of the bath is 2 5/8 inches below the top of the cold cabinet. 4. Fill the bath with alcohol, acetone, or any other low freezing point liquid. 5. Place indexing cover on bath and insert test beakers. 6. Adjust cold box to desired temperature and permit test samples to “soak“ for 16 hours. 7. I
9、mmerse thermocouple (iron constantan) into test sample so that it does not touch the sides or bottom of the beaker. 8. Attach Brookfield Viscosimeter with desired spindle and guard. Place in soak hole on plexiglass cover to stabilize to 23 +/- 2 C for 10 minutes minimum. 9. Remove Brookfield from so
10、ak hole and place on plexiglass leveling support pad which is adjusted to maintain the proper immersion to the depth indicated by the groove cut in the spindle. This groove mark indicates the maximum and minimum immersion. (See manufacturers specification.) 10. Set viscosimeter motor speed (60 rpm).
11、 With viscosimeter in the immersed level position, press down clutch lever; then start motor. FORD LABORATORY TEST METHOD BJ 003-02 Page 3 of 4 Copyright 2001, Ford Global Technologies, Inc. 11. Release clutch lever slowly and allow spindle to run for 8 to 10 seconds, which is generally sufficient t
12、ime for the viscosimeter indicator to stabilize. 12. To take the reading, press down on clutch lever, then shut off motor. Record indicated scale reading. 13. Repeat taking readings as in Steps 9, 10 and 11 until three consecutive and identical readings are obtained. 14. Use the value of these ident
13、ical readings to compute viscosity as follows: (a) Viscosity, centipoises = scale reading x scale factor - air resistance factor (b) Viscosity, centistokes = Viscosity, Centipoises Specific Gravity at Test Temperature Note: The specific gravity of the test fluid should be determined by ASTM D 1298-5
14、5 method. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD BJ 003-02 Page 4 of 4 Copyright 2001, Ford Global Technologies, Inc. DE
15、TERMINATION OF LOW TEMPERATURE VISCOSITY BROOKFIELD VISCOSIMETER Schematic Sketch of Low Temperature Viscosity Apparatus TOP VIEW FRONT VIEW A - Freezer F - Bath 12“ Dia x 12“ Pyrex L - Brookfield B - Insulator Spacer G - Index Cover - 6 Samples M - Beakers (6) ss C- Stirring Rod H - Plexiglass Cover N - Mixer D- Thermometer Bath J - Stand Support P - Soaker Hole E- Bath Coolant K - Thermocouple Sample Q - Potentiometer
