A&D Weighing ML-50 - Manual (Page 18)

MS-70 / MX-50 / MF-50 / ML-50 16
6.3. 6.3. 6.3. 6.3. Proper Operation for Precision Measurement Proper Operation for Precision Measurement Proper Operation for Precision Measurement Proper Operation for Precision Measurement
6.3.1. 6.3.1. 6.3.1. 6.3.1. Operation of the sample Operation of the sample Operation of the sample Operation of the sample
Use a proper sample quantity. If the quantity is small, precise results may not be possible.
If the moisture content of the sample (example: plastic) can be estimated that is less
than 1%, the mass of moisture is not enough for the measurement, when measuring
light sample, the result may not be accurate. Consider the following sample mass for the
measurement.
An estimate of moisture content 1% 0.5% 0.1%
Necessary mass for measurement 2 g at least 5 g at least 20 g at least
If the measurement is repeated, maintain the same sample quantity.
Crush grain samples to a small, uniform powder for a quick drying process.
Spread the sample as evenly as possible.
The analyzer is designed to measure the moisture content
of the sample by its weight change. If the sample includes
volatile matter, it may vaporize during drying causing a measurement error.
When measuring a liquid or liquid state sample that may make a film on the surface, we
recommend you use a glass fiber sheet (AX-MX-32-2).
6.3.2. 6.3.2. 6.3.2. 6.3.2. Operation of the analyzer Operation of the analyzer Operation of the analyzer Operation of the analyzer
Press the RESET key to display the zero value before each
measurement.
Check that the displayed sample weight is stable before
measurement. Press the START key to start a
measurement.
Select the proper Analysis Mode to finish a measurement. Use
the change of moisture content per one minute [%/min] that is
displayed during measurement as a reference value.
The analyzer needs a pre-heating process before measurement. When measuring
samples repeatedly or continuously, the first result is always different from the others.
The pre-heating process is as follows: Put a sample pan, instead of a sample, on the
pan. Press the START key to heat it. The analyzer temperature becomes equilibrium.
Use a sample on the sample pan that has cooled to room temperature. When a sample
is put on a hot sample pan, the moisture content is diffused before measurement, and
precise results are not possible. We recommend you use multiple sample pans.
Do not pile up sample pans during a measurement.
Avoid drift and vibration of air conditioners. It may cause "measurement error" and
"unstable value". In particular, because MS-70 is sensitive instrument, it is necessary to
consider these influences.
When the difference between ambient temperature and sample temperature is small, it
may cause temperature control error.
Example: If the heating temperature is set to 50°C, it is affected by an room temperature.
Check the activation of the halogen lamp with the operation indicator.
Example: If low heating temperature is set, the brightness of halogen lamp becomes dark.
0.000
g
5.43
%
2.02
%/min
Result display
No good Good
Check the activation
with blinking