Sartorius Omnimark LMA 200PM

Speed meets analytical precision

If the sample contains a high moisture content, 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 LMA 200PM 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 moisture is measured by a built-in analytical weighing system featuring 0.1 mg resolution. 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 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 measurement 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 moisture analysis results.

Rapid Analysis Times. Two factors play a major role for ultra-fast measurements. First, the sample must absorb microwave energy within the shortest time possible and transform this into heat energy. For this purpose, the LMA 200PM has a cylindrically shaped sample chamber that optimally focuses the microwave radiation on the sample. Second, the resulting water vapor must be transported away from the sample as fast as possible to obtain fast analysis results. To accomplish this, a sample is applied to a glass fiber pad that allows water vapor to evaporate not only from top of the pad and upward through the sample, but also from the bottom of the pad. An exhaust system draws water vapor out of the sample chamber, thus preventing the effects of condensation.

Comparisons between the LMA 200PM and uWave Moisture Analyzer Industry Datasheet (ethanol) Industry Datasheet (wastewater) Industry Datasheet (fruit & vegetables) Industry Datasheet (paint & coatings)
Specifications
Weighing capacity:	70g
Measuring accuracy of the weighing system:	0.0001g
Reproducibility on average:
Initial sample weight starting at approx. 1 g (%)	+/- 0.05
Sample carriers:	90 mm (3-1/2) glass fiber pads
Display modes:	% moisture, ppm moisture, % volatile components, % dry weight (solids), ppm dry weight, g dry weight, mg loss on drying, % RATIO
Measuring range:	Approx. 8–100% moisture
Sample heating:	Microwave generator with1000 W input power
Power control for heating:	5–100%, adjustable in1% increments
Endpoint determination:	– Fully automatic, by means of mass and moisture sensors – User-defined as loss of weight/time: 1–50 mg/1–99 sec. 0.1–9.9 %/1–99 sec. – Timer mode: 0.1–99.9 min.
Analysis time (in seconds):	Approx. 40–120 (depends on sample and moisture)
Programs:	320 saved to non-volatile memory
Data prinet:	Thermal printer, built-in
Moisture analysis report:	– User-configured GLP record – The report can be printed on non-fading paper by the built-in thermal printer.
Operator guidance:	– Menu-driven, alphanumeric dialogue text (English, French, German, Italian and Spanish selectable) – 5 pre-programmed function keys
Data interfaces:	– 1+ RS-232 port for PC – 1+ Ethernet port
Housing dimensions (mm/in.) W+D+H:	510+535+304 | 20+21+12
Weight, approx. (kg | lb):	22|48.5
Power consumption (VA):	60 max.
Voltage (V AC):	100–230
Frequency (Hz):	50 … 60