45


More confi dence into measuring results originates from the fact that fi lling errors are detected more reliably as PEM allows monitoring the condition of the measuring cell. As a consequence, erroneous results due to bubbles or particles in the fi lled-in sample are eliminated. More certainty means more confi dence.


The FillingCheck™ function makes it possible to detect fi lling errors, also in metallic U-tube oscillators. This is also valid for measurements up to 150°C. Detecting fi lling errors allows avoiding them.


Table 1. Sample changers and their respective properties. Type


Xsample 320


Xsample 330


Xsample 340


Xsample 520


Figure 2. The family of Anton Paar benchtop density meters and the portable DMA 35.


The Silent Assistants That Never Get Tired


With a sample fi lling device, be it a single or a multiple sample fi lling unit, the workload of the operator is made signifi cantly easier. Productivity, quality and repeatability of measurement results can be enhanced. While one sample is being fi lled and measured by the respective instrument(s), the operator can dedicate the time to other tasks such as preparing the next sample to be fi lled and analysed. Filling conditions are exactly identical and not subject to human infl uences. Time can be saved and cross contamination minimised as most fi lling devices provide automatic cleaning and drying procedures. The quality can be monitored even more closely as samples can be determined around the clock - a multi-sample changer never gets tired!


Depending on the requirements, several options of Xsample sample changers offer improved automatic fi lling. Table 1 gives an overview of their characteristic features.


The single sample units Xsample 320 and Xsample 330 allow automatic fi lling by means of a peristaltic pump. Single samples with higher viscosities that are best introduced with a syringe can be accommodated with the Xsample 340 single sample device. Up to two cleaning agents avoid carry-over if samples with different properties are fi lled in succession. Xsample 610 allows effortless fi lling of heavy duty single samples. With temperatures up to 95°C, highly viscous samples and even samples that are solid at room temperature can be handled.


For unattended fi lling of multiple samples 24 hours a day, Xsample 520 is well-suited for similar samples that are measured consecutively when sample recovery is not necessary. In case of different samples, Xsample 530 scores with up to three cleaning liquids to avoid cross contamination, with moderate maintenance requirements, robust design and high resistance to chemicals. Xsample 530 distinguishes itself with its optional sample recovery – no sample goes down the drain, no money is wasted.


Xsample 630 holds the pole position among the Xsample family for multiple samples and offers everything you could possibly ask for. Improved heating to temperatures up to 95°C and short heating periods result in enormous time savings. Xsample 630’s increased performance in magazines with up to 56 positions allows measurements of challenging petrochemical samples, waxes, food, and fl avour samples according to ASTM standards.


Xsample 530


Xsample 610


Xsample 630


Sample fi lling


Single from vial Single from vial


Single with


syringe


Multiple from vial Up to 96


Magazine positions


n/a n/a


Max. sample viscosity


3,000 mPa.s


3,000 mPa.s


n/a


36,000 mPa.s


3,000 mPa.s


Multiple from vial Up to 154 36,000


mPa.s


Single with


syringe


Multiple from vial Up to 56


n/a


10,000 mPa.s at 95°C


36,000 mPa.s at 95°C


Samples per hour


30 15


Sample recovery


No Yes


Automatic cleaning & drying


No Yes


(2 cleaning agents)


Yes 12 30 No No 16 Optional


(2 cleaning agents)


No


Yes (up to 3 cleaning agents


Yes 8 No


(2 cleaning agents)


8 No


Yes (up to 3 cleaning agents)


An Amazingly Wide Range of Applications


Be it the chemical industry, alcoholic and non-alcoholic beverages, pharma and petro industries, density measurement nowadays serves as a means of fast and reliable quality control worldwide.


Density measurement is helpful at all stages of production to determine the quality of incoming raw materials, to monitor the manufacturing progress all the way to the fi nal product where density measurement ensures that only product with the correct composition is delivered to the end user or consumer. The sugar content of soft drinks, the concentration measurement of sulphuric acid, the state of charge of batteries, the right composition to fulfi l the standards required for biodiesel, the conversion of volume-to-weight for products quantifi ed by weight while the products are fi lled, paid and even taxed by their volume, and the concentration of salt solutions for roads and pathways to help commuters in the wintertime to arrive safely at their fi nal destination are only a few examples.


Density meters, with or without a suitable fi lling device, can be combined with other measuring instruments or modules for the simultaneous determination of multiple parameters. In these measuring systems, usually a DMA M density meter acts as the master instrument that gets commands from a PC and forwards them to the respective instruments or modules. The combination of instruments for analysing the required parameters leads to custom-tailored measurement solutions for many industries.


A Modulyzer, the combination of a DMA 4500 M density meter, an Abbemat 550 refractometer, an MCP polarimeter, rounded off with an Xsample 530 multiple sample changer, represents an acknowledged measuring system, especially for the fl avour and fragrance industry as valuable sample can be recovered. With this system, the density, refractive index, and optical rotation can be measured simultaneously. A Modulyzer is shown in Figure 3.


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