Kett FD-720 Operating Manual Download

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3) Specifying settings for RAPID (High-speed drying) mode

During the initial phase of measurement, the material is dried at a temperature higher than the specified
drying temperature to speed up drying and reduce the amount of time required for performing
measurements. Once drying has proceeded to a sufficient point, the temperature is returned to the specified
temperature and drying is continued at that temperature to help prevent burning.

In this mode, it is necessary to specify the drying temperature to be used during the initial phase of
measurement (i.e., the rapid drying temperature) and the amount of change in moisture content over a 30-
second interval needed to maintain that temperature (i.e., the conditions under which the rapid drying
temperature is to be maintained). Rapid drying will continue to be performed until the change in moisture
content over a 30-second interval (

∆

M) falls to a level below the specified level at which rapid drying

conditions are to be maintained, and after that drying will continue at the specified drying temperature.

The amount of change in moisture content over which rapid drying is to be continued may be specified in
0.1-percent increments from 0.1 to 9.9 percent.

Note that a higher value should be specified for the rapid drying temperature than the regular drying
temperature.

Note that it may take a considerable amount of time for the temperature to be lowered from the rapid drying
temperature to the regular drying temperature.

Specifying a relatively low degree of change in moisture content or specifying a high rapid drying temperature
may reduce the amount of time required to perform a measurement, but depending on the sample material
being measured doing so could result in the material becoming burnt or make it impossible to obtain accurate
measurements. Conversely, specifying a relatively high degree of change in moisture content or specifying a
low rapid drying temperature could make it difficult to obtain the effects expected from performing rapid drying.
Either AUTO (automatic halting) or TIME (timed halting) may be specified as the halt condition.

Key(s) used

Operating instructions

With the display displaying the weight in grams, press the
key.

If a password has been specified, the message ‘PASS’ will be
displayed to indicate that a password should be entered. Follow
the instructions in “10-2-7 Specifying a password” on p. 46 to
enter the password.

The ‘CONDITIONS’ display area will begin to flash. Press the

key until ‘MODE’ begins to flash.

With the ‘MODE’ display area flashing, press the

key. This

will cause the highlight to shift to measuring mode selection and
for the currently specified measuring mode to begin flashing.

Press the

key until ‘RPD’ begins to flash.

If ‘RPD’ is already flashing, then proceed directly on to the next

step.

When ‘RPD’ begins to flash, press the

key. The highlight

will then be transferred to the specification of the rapid drying
temperature and the numeric display will begin to flash.