Contact Tracing During the COVID-19 Pandemic

If an infection occurs during courses or in study areas on campus, all contacts need to be traceable. Only in this way can chains of infection be broken. 

Contact Tracing in 2 Stages

Contact Tracing during the COVID-19 pandemic at TUM is done in 2 stages at TUM:

  1. Stage: Before the course: Obligatory registration for the course (TUMonline or Moodle). Without registration it is not possible to attend the course in this semester.
  2. Stage: On the day of the course: Check-in via the QR code in the lecture hall. For this purpose the contact tracing system QRONITON was installed at TUM. After a one-time registration process, check-in in the lecture hall is done by scanning a QR code with the in-app QRONITON-scanner. In our Step-by-Step Guide, we explain step by step what has to be observed during registration and check-in. 

When visiting learning rooms, PC labs, drawing rooms etc., the first stage is not relevant. In these cases, contact tracing is conducted via QRONITON only.

Note: For students of the School of Medicine, contact information is collected using other systems.

Please remember: your participation in both stages of contact data collection is mandatory (see §4(2) and §21(5), 8th BayIfSMV). It serves your own health and safety.

Stage 1: Registration for Courses via TUMonline or Moodle

Registration for the course is done via TUMonline or Moodle. Please note the general instructions on course registration via TUMonlineThe registration is mandatory.

Stage 2: QRONITON at a Glance

The contact tracing system QRONITON records contact data of all persons in a lecture hall or learning room for contact tracing by the TUM Coronavirus crisis management team as well as the health authorities. The following data are deposited once during registration:

  • TUM ID
  • Phone number
  • Zip code of the place of residence

In order to be able to guarantee the tracing of the chain of infection, the room and the length of stay are recorded at check-in.


All data collected in the system is stored on servers in Germany and is encrypted several times to prevent access by unauthorized persons. Symmetrical encryption methods, asymmetrical encryption methods and transport encryption are used to encrypt the data. This ensures that only selected employees of TUM's Coronavirus crisis management team and the responsible health authorities can access the data to trace chains of infection. The provider of the software cannot access the data due to the encryption method used.

We have compiled detailed information on data protection in the document on data privacy in QRONITON.

Step by Step: Registration and Check-in

1. One-time Registration

Technical note: currently the in-App scan function under iOS is only available with the Safari browser. On other devices, please use Chrome or Firefox. 
  1. Go to in your browser.
  2. Use your smartphone to scan the QR Code in the lecture hall or learning room or
  3. Click on START
  4. Select With TUM ID
  5. Confirm with OK.

  1. Select Technical University of Munich from the drop-down menu and confirm by clicking the Select button.
  2. Enter your TUM ID and the corresponding password and click on Login.
  3. If you choose show transferred data you are shown which information will be transferred. Please accept the transfer. 

    Data privacy in QRONITON

Under Registration, your TUM-ID and institution ( are now stored.

  1. Click on OK
  2. Enter your telephone number and the zip code of your place of residence. Please enter a telephone number which allows the responsible public health department to contact you in case of contact tracing (e.g. private mobile phone number). The zip code is necessary to assign of the responsible public health department.

What is meant by ...

...Increased security? Here you have the possibility to choose a PIN, which must be entered for all following check-in procedures. If your smartphone is access protected, you can do without this function.

... Users without a Smartphone? You will find more information in the section Use without Smartphone.

  1. Confirm the information with OK.

This completes the registration process.

After registering on the website, your data will be stored if you allow WebStorage (if not available: cookies) in your browser. This will redirect you to the check-in when you visit the lecture hall again and scan a QR Code.

2. Check-in Upon Entering a Lecture Hall or Study Area

Whenever you visit a course room or study area, you are required to check in to the room using the QR code.

After scanning a QR Code, you will be taken directly to the Contact Scan page.

Here, you will be asked to choose the duration of your stay. The default duration is 90 minutes - the usual duration of a course. In case of a fixed duration, you do not have to check out manually, even if you leave earlier. If the duration of your stay differs from the standard 90 minutes, please enter the specific duration.

If the length of your stay is not yet foreseeable when you enter the room, select Check-in. Please note that this option makes it necessary to check out manually. 

In the upper right corner the current number of people in the room is displayed.

Confirm your entries with OK.

Check your entries. You will see how long you have been checked in and which room it is. You will also see the room capacity and the number of people who have checked into the room. 

Participation Check: Lecturers can use the information Persons in the room/Checked-in persons to check whether all those present have checked in and thus participated in the mandatory contact person entry. After updating ("reload") in the browser, the numbers are updated.

Confirm your entries with OK.

On the main page you will see an overview of personal contacts and scans performed.

If you have selected a specific duration of stay (e.g. 90 minutes) at check-in, a check-out is not necessary – even if you leave earlier.

If you have chosen the option Check-in when checking in, you must scan the QR code again before leaving the room (=check-out).

Contact tracing at TUM includes the use of a smartphone in combination with the possibility to scan QR codes.

As an alternative, you can also scan the code with your tablet or laptop, provided it has a camera and a suitable software or app.

  • Generate an offline code: If scanning the code is not possible, QRONITON offers the possibility to generate an offline code.

    Follow the steps 1.1 to 1.3 (=Registration) and then select User without Smartphone. Now you can generate a so-called Offline-Code, which you can either print out on paper or save as PDF on your PC.

    For check-in, another person present in the room can scan the code for you and use it to register in the room. Please always pay attention to the minimum distance!
  • Scan the offline code: You would like to support a person with an offline code in the room to enter contact data?

    There are two ways to do this:

    Go to and select Scan. Then allow access to your camera. Then scan the offline QR Code and link to the Code of the room or place.


    Scan the offline code with your smartphone. If you are already registered, you will be taken directly to the QR Link page.

    On the QR Link page, select Link under Other Functions. If a PIN was assigned when generating the offline code, you must now enter it. Then scan the code of the room or place, and select the duration of the stay.

3. Generate Your Own QR-Code

When you meet for a learning group or other meeting, you can create your own QR code.

  1. Open QRONITON in your browser: 
  2. If you are already registered, you will be directed to the main page.
  3. Select My QR Code
  4. The system generates a QR code that is valid for 24 hours. Have all persons present at the meeting scan this QR code.

Important: This QR Code is not intended to connect teaching and learning rooms to QRONITON. If you would like to have a teaching or learning room permanently included in QRONITON, please contact the "QR Code Officer" of your school or department. The support will provide you with the contact details of this colleague.

If your telephone number changes, please enter your new number into QRONITON immediately. Only in this way can chains of infection be traced effectively. 

How to change your telephone number:

  1. Open the menu item Data Settings
  2. Select Clear All Data.
  3. Confirm the deletion. 

You can now register again (points 1.1 to 1.3).

What Happens in Case of an Infection?

Persons who have become infected or who are considered to have a high risk of infection (e.g. contact person with symptoms), please report immediately by email to krisenstab-coronavirus(at) (Further information on reporting cases of infection, suspicion or contact).

The crisis management team will then determine possible contact persons both in dialogue with the person and with the help of QRONITON. Identified close contacts are advised on the further procedure (self-isolation, contact with the public health department, testing, etc.).

If contacts in the extended environment cannot be excluded, they will be informed about the case of infection (of course without naming the infected person by name or other identification, comparable to a contact with low risk in the Corona Warn-App).


For questions on QRONITRON, please contact it-support(at)

In case of missing or damaged QR Codes, please note the exact location, building, room and place, and contact