8. Place Hydrometer Cylinder on a level table and using a Thermometer
measure the temperature of the solution in the Hydrometer Cylinder
immediately (Figure 11A). For Thermometer requirements refer to
Appendix A. The measurement of the temperature collected during this
step will be known as the measured temperature of the solution and will
be required on the next step.
9. Depending on what Dry Acid Product is being used, go to Appendix A: GranuFlo® Dry Acid Specific
Gravities Table, page 37:
Locate the GranuFlo® Catalog number of the dry acid product being used.
Using the measured temperature from step 8, locate the value of the measured temperature of
the solution on the chart.
Moving across and then down, identify the ‘low’ and ‘high’ specific gravity numbers.
These ‘low’ and ‘high’ numbers can be recorded in the appropriate box in the GranuFlo® Batch
Production Record Form, pg 31.
Record the measured temperature in the appropriate box in the GranuFlo® Batch Production
Record Form, pg 31, as well.
10. Obtain the clean hydrometer and slowly lower the hydrometer into the
solution until the hydrometer begins to float freely.
11. Hold the top of the hydrometer between your thumb and finger and
spin the hydrometer in the Hydrometer Cylinder (Figure 11B ).
The slow spinning action of the hydrometer will cause the
hydrometer to stay away from the sides of the Hydrometer
Cylinder.
In addition, this will help keep bubbles from forming on the
hydrometer.
12. The hydrometer will move up and down.
While the hydrometer is moving up and down pay attention to
the movement of the surface of the solution around the
hydrometer.
If the meniscus is crinkled or dragged out of shape by the motion
of the hydrometer, then this indicates either the hydrometer or
the surface of the solution is not clean (Figure 12). Discard
contents of Hydrometer Cylinder into the Residual Solution
Bucket.
Clean the hydrometer and the hydrometer cylinder and restart
from Section 7.1, #3, page 16.
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