Sartorius CPA12001S-OCE Specifications download pdf (Page 44)

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Sartorius LMA200PM

Speed Meets Analytical Precision

If the sample contains a high moisture con-

tent, microwave drying is the fastest and

most effective thermogravimetric method

(loss-on-drying principle) for moisture

analysis. Developed for measuring moisture

content ranging from approx. 8% to 100%,

the LMA200PM performs moisture analysis

in a fraction of the time it takes for other

thermogravimetric methods. It delivers

results between approx. 40–120 seconds

on average. With a cylindrical design,

a focused emission of microwave energy

is channeled vertically through dual

apertures at the bottom of the chamber.

This concentrates the microwave energy

specifically to the sample. During the test,

a carousel spins the sample, permitting an

even distribution of microwave energy. This

prevents hot and cold spots from occurring,

a familiar problem with conventional

microwave analyzers.

Built-in analytical balance

The moist and dry weight of the sample

required for calculating the loss of mois-

ture is measured by a built-in analytical

weighing system featuring 0.1 mg resolu-

tion. Thanks to its monolithic design

(the cell is robotically etched from a

single block), this system is particularly

suitable for use in a moisture analyzer,

because it considerably reduces zero point

drift during heat exposure when compared

with classic weighing systems.

Intelligent endpoint determination

A moisture sensor integrated in the exhaust

system of the sample chamber monitors

the progress of drying. When the measure-

ment begins, the moisture of the air inside

the sample chamber continuously increases

as water evaporates from the sample. Once

the sample has dried and no longer releases

water, the air moisture content drops back

to its original level – a clear indication of

the end point. At the same time, the built-

in weighing system monitors the weight

progression and confirms when the

sample reaches a constant weight. This dual

monitoring system ensures optimal mois-

ture analysis results.

High speed

Two factors play a major role for ultra-fast

measurements. First, the sample must

absorb microwave energy within the short-

est time possible and transform it into heat

energy. For this purpose, the LMA200PM

has a cylindrically shaped sample chamber

that focuses the microwave radiation on

the sample optimally. Second, the resulting

water vapor must be transported away

from the sample as fast as possible to

obtain rapid analysis results. To accomplish

this, a sample is applied to a glass fiber pad

that allows water vapor to evaporate not

only from the top of the pad and upward

through the sample, but also from the bot-

tom of the pad. An exhaust system draws

water vapor out of the sample chamber,

thus preventing the effects of condensa-

tion.

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