2 Hall Flowmeter Calibration of Apparatus
2.1 Heat an open glass jar of Chinese Emery in a drying oven at a temperature of 102 to 107 Celsius degree for 1 hour.
2.2 Cool the emery to room temperature in a dessicator.
2.3 Follow the procedure outlined in steps Procedure part.
2.4 Repeat steps Procedure part using the identical 50.0 g mass of emery for all the tests until 5 flow times, the extremes of which shall not differ by more than 0.4 s,have been recorded.
2.5 The average of these five flow times is stamped on the bottom of the funnel.