Product Description - Sartorius LMA316PA Betriebsanleitung

WLM6009-a10081

3. Product description

The system consists of a microprocessor-controlled evaluation unit (the moisture measuring
system) and one or two sensors, which are each connected to the evaluation unit with two micro-
wave cables. When using newer sensor types (Black Line series), an additional connection with
a data cable is also required (
The microwave measuring devices are available as bench-top versions for use in the laboratory
(LMA321PA, LMA316PA) and as wall-mounted units for measurements in production facilities
(PMD320PA, PMD325PA).
The microwave measuring device functions according to a high-precision resonator measuring
procedure. During a measurement, both the resonance frequency and the half-width of the reso-
nance curve are measured. Both of these variables are strongly influenced by the moisture
content and density of the sample material. A patented evaluation algorithm enables compensa-
tion of the density influence, thus resulting in a moisture measurement that is independent of
density.
In the laboratory, the product is placed directly in the cavity sensor or fork sensor, or in direct
contact with a planar sensor.
Usually this does not require any pre-processing of the products, i.e. the products can be meas-
ured in their natural state. The product surface (granularity, structure, colour, etc.) does not influ-
ence the measurement, nor does the product undergo any changes or temperature differences
as a result of the measurement. The calibration curve, recorded once, is independent of type.
This means that a mixture of types and products whose production parameters have been
changed can also be measured using a single calibration curve. Furthermore, the use of addi-
tives, such as minerals or salts only has a minor influence.
The moisture value determined on the basis of the previously performed calibration is shown
immediately on the display.
The TMV software enables storage of the measured values if required. Any number of different
items, together with the corresponding calibrations and measurement data, can be saved in the
device memory - the number is limited only by the actual memory capacity.
A backup function is also available for saving stored data, which enables you to copy data to a
USB stick or an external PC. It is also possible to restore stored data from the USB stick or
external PC to the measuring device.
page 24).
LMA316PA / LMA321PA
11