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How Modern User Interaction Design Revolutionizes the Lab#

The evolution of digital density measurement#

by Siegfried Hold
Kindly made available by Anton Paar GmbH April 2017, based on an earlier entry in the Paar-Blog

Digital density meters have been increasing efficiency in laboratories for almost 5 decades. During that period various technological steps were taken to continuously improve the instruments’ measuring performance. While the density meters´ specifications such as measuring time and accuracy were brought close to perfection, further substantial soft facts have appeared in the 21st century – namely modern user interaction and interface design:

  • Interface design determines the usability of an instruments’ user interface (GUI) (e.g. how intuitively a new operator is able to define settings and navigate through the menu).
  • In contrast, interaction design additionally takes the physical relationship between an operator and the instrument into account (e.g. accessibility of controls or the haptics of input controls).

Of course both factors are important to keep training efforts for new instruments or operators low, to offer the highest possible levels of flexibility and to provide a unique user experience.

Interface design is an endlessly broad topic, which some manufacturers of analytical instrumentation master better than others. However, this article is focused on a specific aspect of interaction design, because even the most perfect user interface design will fail if the corresponding interaction design is weak.

PCAP in comparison#

Even if this topic is discussed in the context of analytical instrumentation, it is still human beings that operate the devices and these human beings are constantly in contact with modern tablets, smartphones and more. This generates an expectation, also when touching any other screen. These modern consumer goods use state-of-the-art PCAP or PCT (projected capacitive touchscreen technology) which generates perfect user interaction – as is the case with the novel density meters of Anton Paar’s DMA Generation M – to satisfy the user´s expectations. Certain advantages of PCAP over traditional touchscreen technology provide a valuable user benefit. While analytical instrumentation meets a different set of demands than consumer products, the expectation of precision and ease of use is certainly the same. In laboratories we can find samples, solvents and cleaning liquids as well as lots of busy people. This calls for an instrument that is resistant, stable and reliable. PCAP touchscreen technology offers precisely that.

PCAP in detail#

While resistive touchscreen technology requires a deformation of the surface, the detection area with PCAP technology is ‘projected’ in front of the surface. This allows the application of chemically hardened glass as surface material which then becomes one of the most robust parts of the laboratory instrument.

Projected Touchscreen
Projected Touchscreen
Foto: Mercury13. Aus: Wikicommons

The following overview provides insights into further strengths of PCAP technology over traditional methods:

Resistive touchscreen#


  • Can be activated with virtually any object Cheap


  • Lower image clarity
  • Poor resistance of outer polyester surface to scratches
  • Occasional recalibrations
  • Moderate pressure required for reliable detection

PCAP touchscreen#


  • Excellent image clarity
  • Higher resistance to scratching
  • High resistance to surface contaminants and liquids
  • High accuracy, repeatability and precision
  • High sensitivity
  • No recalibration required
  • Precision does not depend on pressure


  • Operation with finger, gloves and PCAP stylus only
  • Sensitive to electromagnetic interference

PCAP in action#

Curious about a possible real live scenario? To get a good impression of what PCAP technology means to an analytical instrument – in this case a density meter – watch the movie below.

DMA Generation M: PCAP Touchscreen Technology

[1] Die vorliegende Version wurde am 27. April 2017 mit freundlicher Genehmigung ins Austria-Forum übernommen. Sie basiert auf einem für den Blog von Anton Paar verfassten Artikel vom 29. Oktober 2015 von Siegfried Hold.