Home > 24/7 Legionella monitoring with testo Saveris 2 Wi-fi Data Loggers

24/7 Legionella monitoring with testo Saveris 2 Wi-fi Data Loggers

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The danger often goes unnoticed, but can have very far-reaching consequences. Over and over again, Legionella in drinking water lead to cases of Legionnaire's disease.

Legionella spread among other things through hot and cold water systems. If they are inhaled, for instance in shower steam, they can cause Legionnaire's disease, a serious lung infection.

The testo Saveris 2 - T2 and T3 Wi-Fi loggers monitor hot and cold water temperatures continuously, ensuring the correct temperature can be maintained and the Legionella bacterial is unable to survive and multiply.


The challenge

Legionellosis, or Legionnaire's disease, is an infectious disease caused by bacteria of the genus Legionella. These germs reproduce especially quickly in standing, warm water at temperatures between 20 and 50 °C. Transmission to humans is in principle possible through contact with tap water. If bacteria are ingested through eating or drinking, they are as a rule harmless. Only if water containing bacteria is inhaled can this lead to sickness. Initially, this is relatively harmless, with coughing, diarrhoea and fever, however later on, it can lead to acute pneumonia. In principle, Legionnaire's disease can be treated well using antibiotics, however it can also be fatal – especially for older patients, small children and those with weakened immune systems.

Legionella occur only rarely in natural waters. Areas with an increased risk of possible infection are large buildings with complex air conditioning and water supply systems, such as hospitals, care homes, large hotels, apartment buildings or schools, in which the water can be left standing for longer periods, providing an excellent incubation medium for the Legionella. Nonetheless, the danger is also present in hot tubs, swimming pools, saunas and even on campsites.

In many countries, annual inspections with an obligation of proof are now prescribed, in order to test water systems for Legionella. When the growth of such bacterial cultures needs to be prevented, however, the responsibility lies with you. Because it is only with your help that the inhabitants or guests of the facilities, hotels or swimming pools in your care can be fully protected from Legionella. The appropriate preventive measures also allow you to avoid forced closures and economic losses.

The solution.

With the Wi-Fi temperature logger Saveris 2 T3 or T2 and the additionally available pipe clamp probe, you can test the water temperature in your hot and cold water systems precisely and reliably. If the temperatures measured by you are in the the critical range between 20 and 50 °C for a longer period, there is a danger of Legionella contamination, and therefore an urgent need for action.

Efficient measurement directly on a water pipe The pipe clamp probes, which are available together with the testo Saveris 2 T2/T3 Wi-Fi data loggers, allow you to measure the water temperature directly on the pipe. Depending on the model, Saveris 2 loggers are available with either quick reacting plier probes (T2) for pipes up to 35mm or velcro strap-on probes (T3) for pipes up to 65mm. The probe technology allows the probe to acclimatize very quickly to the pipe temperature, and reacts to even the smallest temperature changes. Legionella reproduce above all where water is stagnant. For this reason, the hot water pipes should be tested directly after the hot water storage tank. The water here should have a temperature which does not drop below 55 °C in the long-term, in order to prevent the reproduction of Legionella. In circulation systems, the point just before reentry into the drinking water heater is particularly relevant for your measurements.

Continuous Data monitoring
The Saveris 2 loggers record data continuously, making long term monitoring possible and thus enabling you to take into account different usage levels for example at weekends and holiday periods.

Fast notification of temperature exceptions
Saveris 2 loggers both record data and will alert users of any temperatures that are too high or low. Alerts can be sent by email, SMS messaging or via a Smart Phone App. Using the software it is also simple to include alarm delays and alarm scheduling.

Precise analysis of the collected data
Using the cloud based software, it is easy to create reports in PDF or CSV format. Reports can be created to run automatically and are sent by email on a daily, weekly or
monthly basis. The reports contain comprehensive information on measurement values, exceptions and Min/Max values.

Legionella detected – now what?
If you have determined, using the temperature data logger testo Saveris 2, that the temperature values of a water pipe system have fluctuated in the critical range between 20 and 50 °C for a longer period, there are different methods for tackling Legionella available to you.

  • For a thermal disinfection, all withdrawal sites must be run with hot water at a temperature of 70 °C for three minutes, as the bacteria die off at this temperature. Depending on the size of the system, thermal disinfection can also be carried out in stages.
  • For chemical disinfections, chlorine products which kill the Legionella germs are usually used. Ozone or chlorine dioxide can also be used, as there are no undesired by-products from these.
  • If the use of chemicals is not desired, the pulse rinsing technique offers a good alternative. Using compressed air bubbles which are introduced to the water transport system, sediments and bio-films which provide nourishment for bacteria are eroded.
  • Ultraviolet irradiation of the drinking water can damage the genetic information of the microorganisms, preventing them from reproducing by cell division.
  • As a rule, regular descaling of shower heads and aerators with organic acids such as vinegar or lemon juice, for example, is indispensable, since calcium lime deposits provide a good colonization structure for germs. Dismantling of excessively large pipelines or dead pipes, such as are often found in old buildings or those in need or restoration, is also a basic requirement in the fight against Legionella.

    With the temperature data logger testo Saveris 2 T2/T3, you can:
    • Measure the water temperature directly at the water pipe, thanks to a special pipe clamp probe
    • Identify limit value violations quickly
    • Analyse the temperature values precisely, with Saveris 2 Wi-Fi data logger software

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