FED-STD-791D
6.2.2.7 Place the other temperature sensing bulb in cooling bath medium adjacent to the
two control sample bottles.
6.2.3 Determine cloud point of test oil(s) by ASTM D 2500 procedure.
6.2.4 Prepare duplicate samples of test oil(s) using test jars filled with approximately 40
mL of test oil(s). Identify these with their SAE grade.
NOTE 1: Clean, dust-free jars and stoppers are required to eliminate possible contamination
which may contribute to erroneous results.
6.2.5 Pretreat the duplicate test oil samples.
6.2.5.1 Place test sample jars in a hot water bath at +80C for 2 h. Shake each test jar
with sample several times.
6.2.5.2 Loosen stopper and allow sample to cool to room temperature. Then reinsert
stopper.
6.2.5.3 Place test sample jars in cooling bath adjacent to control sample jars. All
samples must be at same level if liquid bath is used.
6.2.6 Prepare bath for cyclic temperature test.
6.2.6.1 Temperature of bath should be at +15C. Check thermometer and recorded
temperature of temperature sensing bulbs.
6.2.6.2 If liquid bath is used, adjust level in bath to slightly above sample level in test
jars.
6.2.6.3 Select temperature cycle A or cycle C (Figure l or Figure 2): use cycle A
followed by cycle C for oil with cloud point of -5 to +45 C and cycle C for oils with cloud
point below -5C. Figure 2 includes temperature/time tables for use with programmable
controllers.
6.2.6.4 Initiate the temperature cycle selected in 6.2.6.3.
6.2.7 During the final cool down, check proper temperature control each day as follows:
6.2.7.1 Read the "Temperature Measurement Sample" thermometer. Return this sample
to the center of the bath.
6.2.7.2 Compare this temperature with the recorded temperature.
23
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business