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Equipment in a refractometer kit
QUALITY SURVEILLANCE LOG BOOKS

Aviation Boatswains Mate F - Aviation theories and other practices
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Operation of the Refractometer The refractometer is to be used in the quality surveillance lab, not on the flight deck or on the sponson. The light source can be a fluorescent or incandescent bulb, but the area must be well lighted. To use the instrument, perform the following steps: 1. Set up the ring stand assembly as shown in figure 3-10. 2. Use prescribed sampling procedures and take a 1-quart sample of the fuel to be tested in a clean sample bottle. 3. Half fill the aluminum dish with tap water. 4. Fill the graduated cylinder (fig. 3-10) and the separator funnel about one-third full with the fuel to be tested. Rinse the cylinder and funnel thoroughly to clear them of any foreign material and empty the contents. 5. Now fill the graduated cylinder with exactly 160 ml of the fuel sample. 6. Check to see if the drain cock on the separator funnel is closed. If not, close it and pour the 160 ml from the graduated cylinder into the separator-y funnel. 7. Using a piston pipet, add exactly 2 ml of water from the dish to the separator funnel. Place the capon the funnel and shake it for 3 minutes. Place the funnel in the ringstand as shown (fig. 3- 10). 8. Open the hinged plastic cover of the refrac- tometer’s window (fig. 3-11), make sure the window and cover are clean, and place several drops of water on it. Close the cover and look through the eyepiece. Observe the shadow line. Remove the black plastic rod from the bottom of the refractometer. Using the rod, adjust the setscrew (on the bottom of the refractometer) until the shadow line meets the zero line of the scale. See figures 3-12 and 3-13. By adjusting the set screw Figure 3-12.—Refractometer (side view). Figure 3-13.—Views through a refractometer. 3-24







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