1、FORD LABORATORY TEST METHOD EU-BJ 003-02 Date 2001 0723 1994 02 28 DETERMINATION OF LOW TEMPERATURE VISCOSITY BROOKFIELD VISCOSIMETER Action Revisions Revised Editorial - no technical change A. Cockman Application This method is used to determine the low temperature viscosities of new and used oils
2、by Brookfield viscosimeter. The method consists of cooling a test sample of oil in the cold bath and determining its viscosity without removing it from the cold bath. Apparatus and Materials Required Cold Box Capable of maintaining temperatures to - 40 OC within +/- 2 “C. Insulator Cork or wood to p
3、revent bath from resting on bottom of cold box. Stirring Rod Thermometer For viscosity bath (+ 20 to - 40 OC). Coolant Alcohol. Viscosity Bath 300 mm dia by 300 mm deep. Six Station Sample Indexing Cover Plates Plexiglass Cover With support for Brookfield viscosimeter. This item replaces one of the
4、two pyrofoam covers of the freezer. Support Stand For stirrer motor. Thermocouple (Iron-constantan) immersed in test fluid sample. Copyright 02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD EU-BJ 003-02 Brookfield Viscosimeter Model No. LVF or LVT, and spindles No. 3 and No. 4 with g
5、uard. Six Stainless Steel Sample Beakers (500 mL) Mixer Pyrometer Potentiometer With an accuracy of 1 % Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24
6、h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. 2. 3. 4. 5. 6. 7. 8. 9. 1 o. Fill beakers with 275 +/- 5 mL of oil under test. Heat oil in oven at 100 OC for 30 minutes to remove any moisture present in test sample. Cool to 23 +/- 2 OC. Place Pyrex gl
7、ass bath into cold cabinet on insulator spacer. Adjust the height so the top of the bath is 65 mm below the top of the cold cabinet. Fill the bath with alcohol, acetone, or any other low freezing point liquid. Place indexing cover on bath and insert test beakers. Adjust cold box to desired temperatu
8、re and condition test samples for 16 hours. Immerse thermocouple (iron-constantan) into test sample so that it does not touch the sides or bottom of the beaker. Attach Brookfield viscosimeter with desired spindle and guard. Place in soak hole on plexiglass cover to stabilize to 23 +/- 2 OC, 10 minut
9、es minimum. Remove Brookfield from soak hole and place on plexiglass levelling 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.) Set
10、viscosimeter motor speed (60 r.p.m.). With viscosimeter in the immersed level position, press down clutch lever, then start motor. Page 2 of 4 Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD EU-BJ 003-02 11. Release clutch lever slowly and allow spindle to run for 8 - 1 O se
11、conds, which is generally sufficient time for the viscosimeter indicator to stabilize itself. 12. To take the reading, press down on clutch lever, then switch off motor. Record indicated scale reading. 13. Repeat taking readings as in para IO, 11 and 12 until three consecutive and identical readings
12、 are obtained. Evaluation Use the value of these identical readings to calculate viscosity as follows: A. Viscosity, dynamic = scale reading x scale factor - air resistance factor in I O-3 Ns/m2 B. Viscosity, kinetic = Viscositv mm2 /s Specific Gravity at Test Temperature Note: The specific gravity
13、of the test fluid should be determined by ASTM D 1298 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. Page 3 of 4 Copynght02001, Ford Global Technolo
14、gies, Inc FORD LABORATORY TEST METHOD EU-BJ 003-02 Q- P- N- M- L- Top View A- Cold BOX B - Insulator Spacer C - Stirring Rod D - Thermometer (bath) E - Bath Coolant F - Bath G - Index Cover (6 samples) H - Plexiglass Cover Fro nt View J - StandSupport K - Thermocouple L - Brookfield Viscosimeter M - Beakers N - Mixer P - Soaker Hole Q - Potentiometer Page 4 of 4 Copynght02001, Ford Global Technologies, Inc
