لخّصلي

1.Refer to the attached table (Column Ia) for Hagenbach correction factor (y).Steadily apply vacuum to capillary tube by pulling the syringe piston.This will cause successive filling of the reference level vessel (5), the capillary tube (1), the measuring sphere (8), and the pre-run sphere (9).Liquid column will separate at the lower end of the capillary (7) and form suspended level at the dome-shaped top part (6).Transfer 15 ml of test sample to the Viscometer through filling tube (3) into reservoir (4).Connect a syringe to the capillary tube (1).Close the venting tube (2) by a finger or rubber stopper.Discontinue the syringe suction.2.3.4.5.6.7.8.9.10.

1. 
   

   Place the Ubbelohde Viscometer on a level table carefully.

   
   


2. 
   

   Prepare a solution of dish wash liquid with water. Take 40 ml of water in a beaker, and slowly add 10 ml of dish wash liquid. Mix the solution (avoid bubble formation).

   
   


3. 
   

   Transfer 15 ml of test sample to the Viscometer through filling tube (3) into reservoir (4).

   
   


4. 
   

   Connect a syringe to the capillary tube (1). Close the venting tube (2) by a finger or rubber stopper. Steadily apply vacuum to capillary tube by pulling the syringe piston. This will cause successive filling of the reference level vessel (5), the capillary tube (1), the measuring sphere (8), and the pre-run sphere (9).

   
   


5. 
   

   Discontinue the syringe suction. Open the venting tube.

   
   


6. 
   

   Liquid column will separate at the lower end of the capillary (7) and form suspended level at the dome-shaped top part (6).

   
   


7. 
   

   Remove the syringe from tubing. Fluid begins to flow down through capillary.

   
   


8. 
   

   Measure the time interval it takes the leading edge of the meniscus of sample to descend from the upper edge of upper timing mark M1 to the upper edge of lower timing mark M2.

   
   


9. 
   

   Repeat step 4 to 8 for 2 times to get an averaged time interval.

   
   


10. 
    

    Refer to the attached table (Column Ia) for Hagenbach correction factor (y).