The miniature MSR 147WD Data Logger introduced by Saelig Company has been designed to receive pre-calibrated humidity and temperature sensors. The small (35 x 17 x 57 mm) and lightweight (27 g) logger is suited for tests on human subjects, or for measuring the properties of textiles and clothing during manufacture and in active use.
The MSR 147WD, equipped with Bluetooth Low Energy (BLE) communication and storage for one million 
Source: Saelig Company measured values, can wirelessly monitor physiological parameters such as skin temperature and ambient humidity over long periods. The logger is powered by an internal rechargeable 260-mAh lithium-polymer battery, and it is also available in an IP67 waterproof version.
Five logging channels connect external, pre-calibrated MSR humidity and temperature sensors. The MSR sensors can be individually inserted and removed, and an automatic configuration feature means that the MSR 147WD data logger instantly recognizes a sensor when it is inserted. Calibration data is stored in the sensor itself. Sensors measuring air pressure and three-axis acceleration (static) can be internally-mounted for additional data parameters. The measured values can be retrieved online by means of a BLE or USB connection. A smartphone app “MSR DataLogger” allows for remote control (start, stop, read out data recordings) or for transferring readings to “MSR SmartCloud” storage.
The MSR 147WD features a built-in OLED color display that shows data and graphical charts, allowing real-time data to be checked without needing a smartphone. When testing functional clothing (e.g., comfort on the skin and the microclimate between individual layers of clothing) the built-in Bluetooth 4.0 smart communication makes the task significantly easier. Using the MSR DataLogger app on a smart device permits the user to check that the data is being properly recorded without requiring a test subject to adjust clothing to access the logger.
Application examples:
- Environmental chamber tests on subjects in controlled conditions: skin temperature and moisture level.
- Operational field tests (skiing, jogging, cycling, swimming, fire-fighting, military operations) for moisture levels inside shoes, helmets and clothing.
- Sleep tests: skin moisture level, temperature, sleeping tent temperature, moisture and pressure variations of air beds during movement.
- Medical field: skin temperature/moisture level with surgical stockings, temperature/moisture level profile with medical skin coverings; efficiency measurements of cooling and heating pads.
- Test measurements for designing foundry-protective clothing and other functional or work clothing.
Made in Switzerland by MSR Electronics GmbH, specialists in designing miniaturized dataloggers for a broad range of uses, MSR 147WD Data Loggers are available from Saelig, their U.S. technical distributor.
