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Features
Load programs*
The program database in the
LMA200PM can store up to 320 drying
programs. To view a list of available
programs, sorted alphabetically by short
name, select Setup > Manage programs
> Load program.
Change current program*
Short name, Long name
You can designate both a short name
(up to 15 characters) and a long name
(up to 20 characters) for each program.
Each short name must be unique in the
database.
ID1, ID2
You can assign 2 identifiers (up to 20
characters each) for each program.
Microwave mode
There are two modes to choose from for
operation of the microwave:
– High range (2% - 100%)
– Low range (30% - 100%), roughly
10% - 30% of the maximum microwave
output. We recommend using the low
range mode as a rule.
Analysis mode
There are three modes to choose from
for analysis:
– Standard
– Addition of water
– Concentrate
Standard
Most analyses are performed using this
method.
Addition of water
When the sample is heated by microwave
radiation, dipolar molecules, such as
water molecules, in the sample absorb
the radiated energy.
Relatively dry samples – with a moisture
content below 10% – contain few dipo-
lar molecules. Thus it takes longer to
heat the sample. Adding distilled water
to the sample has a catalytic effect,
in that the energy from the microwave
radiation is absorbed faster, causing the
sample to heat up more quickly.
Note:
The added distilled water evaporates
completely during the drying process
and does not distort the results of
moisture analysis.
Concentration
The LMA200PM can analyze only small
volume samples. If the proportion of
solids for a larger volume is sought, the
“Concentrate" function is used.
Example:
A 5-ml sample is taken from 1 liter of
waste water. Before starting the analysis,
the user enters “1000 ml" as the
initial volume. The moisture analyz-
er multiplies the proportion of solids
detected by a factor of 200 (1000 ml:
5 ml). The result is the proportion of sol-
ids in 1000 ml of the sample material.
Drying process
The drying process can be divided into
stages, with different microwave output
in each stage.
Note:
The time of the last stage is the deter-
mined by the shutoff parameter in all
drying processes.
– Standard:
The microwave output remains constant
throughout the entire drying process.
– 2 stages:
The drying process is divided into two
stages, with different levels of microwave
output in each stage. You can configure
a period of 0.0 to 10.0 minutes for first
stage.
– 3 stages:
The drying process is divided into three
stages, with different levels of microwave
output in each stage. You can configure
periods of 0.0 to 10.0 minutes for the
first and second stages.
* Access rights required
Initial weight
You can define conditions for the initial
weight that must be met before the
analysis can start:
– Off:
No conditions are defined for the initial
weight
– Minimum/maximum:
The initial weight must be greater than
the defined minimum weight and less
than the defined maximum weight.
If “Locked" is set under “Start," analysis
cannot be performed if the initial
weight is not between the minimum
and maximum values. If “Unlocked" is
set, the minimum and maximum values
are merely guidelines.
– Setpoint/tolerance limits:
You can define a target weight
(setpoint) and associated tolerance
limits for the initial weight.
In this case, the initial weight must be
greater than the setpoint minus toler-
ance and less than the setpoint plus
tolerance. If “Locked" is set under
“Start," analysis cannot be performed
if the initial weight is not within the
tolerance limits. If “Unlocked" is set, the
setpoint and tolerance values are merely
guidelines.
Sample capturing
The speed at which the balance registers
weights and transfers data during initial
weighing can be adapted to the particu-
lar sample being analyzed:
–
Standard
–
Fast
–
Very fast
–
Key w/o stability
Standard:
For normal samples and normal
handling;
Fast:
For samples that must be applied quick-
ly, or if you require a relatively exact
weight toward a target;
Very fast:
For samples containing slightly volatile
components;
Key w/o stability:
The balance performs as under the “very
fast” option;
For samples with volatile constituents,
such as hairspray:
Spray sample on pan, wait 1–2 sec.
(spray pressure)
