7
⑶
Use petroleum ether (other organic solvents are forbidden) to clean
thrice. Each time shall follow the bellow procedures:
①
Pour the petroleum ether into the oil cup till the cup is 1/4
～
1/3 full.
②
Cover the cup mouth with a piece of glass cleaned by petroleum ether.
Shake the cup evenly for one minute with certain force.
③
Pour away the petroleum ether and dry the cup with a blower for 2~3
minutes.
⑷
Use the oil sample to be tested to clean the cup for 1~3 times.
①
Pour the petroleum ether into the oil cup till the cup is 1/4
～
1/3 full.
②
Cover the cup mouth with a piece of glass cleaned by petroleum ether.
Shake the cup evenly for one minute with certain force.
③
Pour away the left oil sample and then the test starts.
2. Agitating Blade Cleaning Method
⑴
Wipe the agitating blade again and again with clean silk cloth until fine
particles are not found on their surfaces. It is forbidden to touch the
surfaces with hands.
⑵
Use forceps to clamp the blade; put them into petroleum ether and wash.
⑶
Use forceps to clamp the blade and dry them with a blower.
⑷
Use forceps to clamp the blade; put them into the oil sample to be tested
and wash.
3. Oil Cup Storage
Method 1
Fill the cup with good insulating oil after the test is finished and
place it stable.
Method 2
Clean and dry the cup under the above procedures and then put
it into a vacuum dryer.
Note:
The oil cup and agitating blade shall be cleaned under the above
procedures after the first test and tests with poor oil.
