8
2. Description of Features and Principles of Operation
2-1 Principles of Operation
This unit determines the moisture and solid contents of samples by heating them using infrared
illumination and measuring changes in mass due to evaporation. This is referred to as the loss on
drying method and is the simplest method for determining moisture content and thus mandated by
many public regulations related to measurement standards.
2-2 Features
UniBloc sensor
The core of the scale is formed by a single-unit aluminum UniBloc*
1
weight sensor which provides excellent responsive-
ness, temperature characteristics, and shock resistance. This UniBloc*
1
sensor ensures excellent reliability in moisture
content measurements even over extended use.
New Auto Taring mechanism
The FD-720 comes with an internal Auto Taring mechanism which makes it possible to perform reset correction while
performing measurements, thus eliminating drift of the scale even when performing measurements over long periods of
time and making it possible to obtain extremely reliable measurements.
Mid-infrared quartz heating lamp
The FD-720 uses a mid-infrared quartz heating lamp (with a central wavelength of 2.6
µ
m). This heater provides
excellent drying efficiency over a wide range of different types of sample, makes it difficult for differences to occur as a
result of the colors of different samples, and eliminates the overheating of sample surfaces, thus making it possible to
obtain ideal drying conditions.
What‘s more, this heating lamp also provides a long service life 5~10 times greater (20,000 to 30,000 hours*
2
) than
older infrared or halogen lamps.
A wide selection of measuring modes
The FD-720 provides a wide selection of measuring modes (automatic halting mode, timed halting mode, high-speed
drying mode, low-speed drying mode, stepped drying mode, and predictive measuring mode) which makes it possible to
perform measurements under the drying conditions most appropriate to the drying characteristics of the sample being
measured.
The ability to store measuring conditions
The FD-720 provides 10 measuring conditions storage areas which may be used to store sets of measuring conditions
to be used for different types of materials, thus reducing the amount of time involved in specifying settings before
performing measurements.
Data memory
The FD-720 is able to store up to 100 sets of measurement data in memory, thus making it possible to output large
batches of data all at one time.
Printer port
The FD-720 is equipped with a printer port which may be used to connect to a (separately sold) printer, thus making it
possible to print out text or graph data showing final measurements, or intermediate drying states while performing
measurements.
Scale calibration
The scale of the FD-720 can be calibrated, and it is possible to print output during calibration meeting GLP, GMP, or ISO
standards.
The ability to display changes in moisture content (
∆
M) in a numeric and scalar display
The change (
∆
M) in moisture content over 30-second intervals is displayed in a numeric and scalar display, thus making
it easier to estimate when a measurements should be completed. This feature is also useful in helping to determine
measurement completion conditions.
*1 UniBlock is a product name of the Shimadzu Corporation.
*2 Indicates actual measured time for operation of infrared heater. Your performance may vary.
2-3 Applications (i.e., materials which can be measured)
Materials for which water is the only main component which evaporates as a result of heating
Materials for which no dangerous chemical reactions or other changes occur as a result of
heating
* Measurements can be performed using virtually any material meeting these conditions.
Summary of Contents for FD-720
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