Is it possible to compress the QSD data files?

 Yes, you can make the data files smaller (for details, see the User Manuals):

  • E4/E1
    • Before a measurement: In the ‘Setup Measurement’ menu, under ‘Resonance optimization’, you can vary the time resolution by sliding the pin on the dial towards low noise, i.e. low time resolution.
    • After a measurement: In the ‘File’ menu, there is a function ‘Condense…’ with which you can compress the QSoft data. The output file will be a QTools data file.
  • D300
    • Before a measurement: In the ‘Settings’ window, under the tab ‘Miscellaneous’, there is a line ‘Points in median’ where you can set, for instance, 10 which would mean that 10 data points are averaged before being plotted on the screen. The whole data set will then be a 1/10 of the size it would have as un-averaged.
After a measurement: Go to the QSoft directory, found under Program FilesQ-Sense, and open the .exe file ‘Condenser’. Follow the instructions from there.

How do I stitch files?

  1. Open QSoft 401 (does not work in older versions).
  2. Open the two files that you would like to stitch.
  3. Go to ‘File’ › ‘Stitch data files’.
  4. A new window appears. Here, you choose which of the two open files that should come first. You should choose the file for the baseline of the bare surface. You also have an option to choose the ‘new time between data files’. Set this time to ‘0’ (i.e. there should be no time difference between the two files).
Click ‘Stitch’.

How do I install and activate the QTools software? 

  1. Please exit all programs before attempting installation. QTools can be found either on the installation CD or at our website.
  2. Run the QTools installation file and the InstallAware wizard will guide you through the setup process. Please note that you need to have admin rights in order to be able to complete the installation.
  3. If QTools has not been previously installed on this PC, the QTools installation manager will automatically be launched the first time you start QTools. You can then start a 10-day trial period. We recommend that you at this time apply for a registration string. Just follow the on-screen instructions.

There are two types of registration strings, temporary and permanent. A temporary string is 25 characters long and will expire in a few days. A permanent string is 30 characters long and can only be obtained after you have sent the file ‘QTools reg info.qri’ (from the folder specified in the information dialog box that QTools presents – depends on the OS) to This file will automatically be generated by the QTools registration manager. If you have an email program running, QTools can automatically use this to create an email. All you then have to do is to click on ‘Send’ in the mail QTools created for you.

The ‘QTools reg info.qri’ file contains information that identifies your computer and this information will be coded into the registration file you will receive from Q-Sense. QTools will periodically check if there is a match between the registration string and the ‘QTools reg info.qri’ file. If there is no match, QTools will notify the user and ask for a valid registration string. QTools cannot be run from a local server but needs to be installed locally on each computer.

Please also note that after changing hard drive or upgrading from Windows XP to 7, a new QTools registration string needs to be generated after software reinstallation.

How do I register QTools if it is installed on a computer without an Internet connection?
  1. First locate the registration file named ‘QTools reg info.qri’ from the folder specified in the information dialog box that QTools presents during registration (folder depends on the OS).
  2. Copy the file to another media (thumb drive), then send that file as an attachment from an Internet connected PC with an email client.

Please note that it is preferable to identify this file with a name chosen so that it is possible to know which PC it came from. The reason is that each registration file is unique. It is especially important if there are several QTools computers in the facility.

How do I deactivate my QTools registration string to allow a new user to install QTools?

Open QTools. Go to ‘Help’ › ‘Launch Registration Manager’, then click ‘Remove registration’. This will disable QTools on that computer. Note that the registration string is connected to the computer and not the user. Also, it is necessary to have administrative rights in order to run QTools registration manager. QTools, however, can be run under normal user rights.

The new user can then apply for a new registration string on another computer. For details see the FAQ ‘How do I install and activate the QTools software?’.

What is the maximum kinetic resolution of Analyzer/Explorer?

The maximum acquisition rate is more than 200 data points per second. If default settings are used, an average function is employed that gives around 100 data points per second, distributed according to how many modules and frequencies that you have chosen to acquire. The exact number of data points taken depends on how fast the signal is damped, which means that a measurement in water gives a higher kinetic resolution than one in air, and higher frequencies give a higher resolution than lower ones.

Why does the number of data points per time unit differ within one single measurement?

QSoft is trying to sample as many points as possible with the given settings (more resonances and more averaging will slow down sample speed). For each point, a lot of data is being transferred from electronics to the PC, where it is processed. So depending on how much the PC is loaded with other processes it will have a slightly different sampling speed.

Why are the default settings in QSoft 401 different for different sensors?

Clicking ‘Automatically optimize all resonances’ will give the default settings for a measurement run. The optimization of driving and recording of the crystal is dependent on D and the overtone number, which means that different sensors (flow modules) can have different settings.

How do I handle the error message ‘Instrument running uncalibrated’?

Make sure you have got the latest version of QSoft401 installed. This version of the software will take care of the problem automatically or guide you through the steps necessary to solve it.

I am using solvents with my D300, but the QSoft settings only refer to water or air. What settings should I use for solvents?

There are no particular settings for each type of solvent, such as toluene or ethanol, but they should be similar to water settings. What is important is that the decay curve window looks normal, i.e. the time interval used for data sampling of the sinusoidal decay curve is properly chosen: it should be long enough to include a sufficient number of oscillation periods, allowing a good mathematical fit to it, but not too long so that the decay curve has leveled out within the window. Use the ‘Sample frequency’ to change the length of the decay curve capturing window.

What is ‘wavelength’ in QSoft 301?

The wavelength, set under ‘Settings’ › ‘Edit…’ › ‘Acquisition’, is the number of data points used in the fitting of a decay curve. Together with the sampling frequency they give the decay fitting time

What is the OS compatiblity for QSoft and QTools?

QSoft and QTools are compatible with Windows 7, 8 and 10 platforms. We do not support Vista and XP but current versions of the software may work.

Please note that you need a native Windows installation (it will not work properly on virtual Windows for e.g. Mac).

Can I install QSoft or QTools on a Mac?

There is currently no version of QTools for the Mac OS. It may be possible to install it on a dual boot Mac, with Windows XP or higher installed on it. QTools cannot be registered on Windows emulation software made for the Mac OS, however. You will need to partition your hard disk, then install a licensed copy of Windows on it.