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Data loggers in practical application

Thorsten Knauf, Business Development Manager, Delta OHM, has written this article, describing typical applications and solutions with a data logger system using a medical device as an example. Incl. Interview with Ralph Rulle, owner of the independent trading company Messbar - Dipl.-Ing. Ralph Rulle e.K.


Flexibility and future security of wireless data logger systems

Modern wireless data logger systems must be able to meet the changing and growing requirements of the user and they must be flexibly extensible. In addition they should satisfy the individual requirements and directives relative to the recording of the acquired data and guarantee protection against data loss. Typical applications and solution recommendations with a data logger are described below, using a medical device as the example.

The acquisition of climatic measured values (CO2, temperature, relative humidity) should help in determining and evaluating the energy efficiency of a building (operating costs). There are various requirements from the occupational health perspective, such as the intensity of illumination at the workplace, protection against exposure, for example, through UVC radiation for sterilisation/disinfection, room air quality, comfort, differential pressure monitoring of operating rooms, etc. In addition, the monitoring of medication refrigerators (temperature) and incubators (temperature and humidity) should be integrated. Finally, cost-effective retrofitting should be possible with minimal installation effort.

A range of up to 300 m at low energy consumption

In this regard, the HD35 system from Delta OHM makes data loggers available that can be configured individually to meet the respective requirements profile for recording of temperature, relative humidity, pressure, intensity of illumination, irradiation intensity (UV, solar radiation) room air quality (CO2) and meteorological variables, such as wind speed and wind direction. The radio frequency used enables a range of up to 300 m (free-field) with concurrent minimum energy consumption. The transmission paths can be extended as needed with repeaters.  The user can quickly and cost-effectively install the battery-operated data loggersm(Battery service life of two years at 30 s recording interval) on site. Data loggers with universal inputs, current interface, voltage interface, contact input or potentiometer input) allow integration of additional variables and increase flexibility. If there are upper or lower deviations from limit values the alarm handling plays a central role. The alarms run into the alarm centre, and the alarming can occur directly on site, for example, if a refrigerator door has been left open. For this purpose, alarm modules are available that can be installed on site and used for activation of optical and acoustic signalling devices. In addition, alarms can be forwarded as SMS or forwarded via email to the responsible personnel.

The possibility of data loss is excluded through triple backup

Thanks to triple storage of the data (in the data logger, in the receiving unit access point and in the database) the possibility of lost measurement data is virtually excluded. In the example cited above, all measurement data should flow into a central point outside of the facility. For this an access point HD35APW is used, which is connected via Ethernet TCP/IP WiFi connection to the local network and transmits the data at regular intervals to an FTP server in the company's headquarters facility. There the measurement data is imported into a higher-level data acquisition system. The measurement data is transmitted directly from the access point, which is connected via the local network. Software operation, e.g. for fulfilment of requirements stipulated in 21 CFR Part 11, are optionally available and support the owner's ability to ensure the quality standards imposed on him.