37 Correct sample fi lling for correct results
In order to obtain precise and accurate results the sample fi lling has to be done seamlessly. The FillingCheck function, a means of recognising inhomogeneities and gas bubbles in the measuring cell, has been noticeably improved over the years and is now able to react even more reliably thanks to the ‘Pulsed Excitation Method’. The correct functioning and state of the glass measuring cell can now also be monitored continuously. Thus, on top of their robust and reliable construction and design, Anton Paar density meters score with a unique repeatability of better than 1*10-6
g/cm³.
The DMA 4200 M density meter with its measuring cell made of metal is especially suitable for petroleum measurements due to the fact that it works up to 200°C and 500 bar. It was developed to cope with samples like asphalt and waxes which are liquefi ed by high temperatures in order to be in a suitable aggregate state for density measurements. The ‘Pulsed Excitation Method’ makes it possible for the fi rst time to also use the FillingCheck function for metallic measuring cells.
DMA 4200 M is factory-adjusted prior to delivery and ready for use as soon as the desired measuring temperature between 0°C and 150°C has been selected.
It’s the oscillation that matters
Today, Anton Paar equips all new benchtop density meters with a so-called Y-oscillator (Figure 3a). This new design eliminates viscosity constraints over the entire measuring range, allows the reliable detection of particles and gas bubbles, and achieves an accuracy of up to 0.000007 g/cm³.
Some other density meters on the market have U-tubes that oscillate in the X-direction (Figure 3b). However, X-oscillators are proven to be subject to technical limitations such as limited accuracy in the case of viscous samples and a high error probability in the case of inhomogeneous samples or if there are particles and gas bubbles in the sample. This is why X-oscillators made from glass are limited to an accuracy of only 0.001 g/cm³.
on the obtained data, a possible drift is compensated automatically. This means that the instrument is adjusted twice as fast and it takes only half the effort that other density meters require to reach full operational status. The density meters DMA 501 and DMA 1001 even indicate when there are suboptimal ambient conditions like humidity and temperature and give recommendations on how to achieve optimum life expectancy of the instrument.
The portable density meter DMA 35, the only density meter available in intrinsically safe versions suitable for use in hazardous areas (DMA 35 Ex and DMA 35 Ex Petrol), offers the patented feature of an exchangeable glass measuring cell (AT 516421 (B1)). Thus, a broken glass cell does not halt measurement processes anymore: The exchange of the measuring cell can be carried out by the user directly on-site. Additionally, the gesture control enables measurements to be initiated or stopped by defi ned movements of the instrument. This feature is especially useful as one hand remains free and represents an additional safety aspect if measurements are carried out in places that are diffi cult to access.
Table 1 indicates to what extent the technical confi guration of Anton Paar’s individual density meters meet the needs of a vast number of customer applications. The ISO 17025 accreditation certifi es that Anton Paar density meters are not only produced according to the highest quality standards, they can also be traceably calibrated with certifi ed reference materials.
Table 1. Anton Paar density meters and their characteristics. Features
DMA 35 DMA 501 DMA 1001
Portable
Temperfect feature FillingCheck feature U-View feature
Pulsed Excitation Method
Repeatability of the density result s. d.
√
√ √ √
0.0005 g/cm³ DMA 501: 0.0002 g/cm³ DMA 1001: 0.00005 g/cm³
Automatic fi lling
System capability for multiparameter measurements
Figure 3a. Working principle of a Y-oscillator. Gesture control √ √
√ √ √ √
DMA 4100 M: 0.00001 g/cm³ DMA 4500 M: 0.000005 g/cm³ DMA 5000 M: 0.000001 g/cm³
√ √
√ √
√ √
√ 0.00005 g/cm³
DMA 4100 M DMA 4500 M DMA 5000 M
DMA 4200 M
In Anton Paar’s patented ‘Pulsed Excitation Method’ the U-tube is excited by impulses to oscillate. Once a constant amplitude is achieved, the pulse sequence is stopped. The U-tube’s oscillation is measured while it fades out freely and unaffected by any infl uences. Excitation and fade-out alternate periodically.
Its advantages are: Figure 3b. Working principle of an X-oscillator.
However, the Anton Paar engineering team wanted to meet its customers halfway: In order to develop a measuring instrument that was accurate to the fourth decimal place and affordable at the same time, they developed the Y-oscillator for the DMA 1001 density meter. Thanks to this oscillator and its option for a one-point adjustment, the reference oscillator was rendered obsolete. The measured oscillation period of the water-fi lled measuring cell is compared to the obtained result of the prior adjustment and, based
- More information for users compared to conventional density measuring methods - Improved viscosity correction - Improved repeatability and reproducibility
For more information see
www.anton-paar.com/densityredefi ned
Please note: The name DMA for all Anton Paar density meters as well as the instrument features FillingCheck, U-View, and Temperfect are trademarks protected by Anton Paar. For better readability, the annex “TM” after the protected instrument features was omitted in the text.
New Generation Soft Dry Bath
The high quality soft dry bath developed and produced by Wiggens performs with uniform heat transfer and fast heat conduction. It features a bright and clear LCD digital display and setting for the working temperature, stirring speed, working time and safety temperature. A direct connection for Pt100 temperature sensor provides a convenient temperature control solution. With infrared heating (IR) technology, built-in 3 set PID parameters, the bath can achieve faster heating effect and better temperature stability.
The Wiggens soft dry bath is very suitable for replacing the small oil bath commonly used in the laboratory dry bath module. It accommodates any container shape, operates without oil, therefore no cleaning is required as it operates from an electric heating sleeve and other heating methods. The stainless steel bottom helps to transfer the heat to alloy particles extremely quickly. The housing is surrounded by PTFE material, for insulation and anticorrosion.
The Wiggens new generation soft dry bath permits simple operation whilst still meeting the modernity of smartphones, allowing users feel connected to the intelligent lab. More information online:
ilmt.co/PL/nOV9
48085pr@reply-direct.com
WWW.LABMATE-ONLINE.COM
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