Data logger with wireless sensors operates up to 125°C

May 11, 2015 // By Jean-Pierre Joosting
The MSR385WD wireless data logger from MSR Electronics GmbH operates in the 868 MHz ISM band enabling users to permanently record temperature, humidity and pressure values using miniature transmitter modules over long periods of time, at operating temperatures from -20 °C to +125 °C

Two years after the market launch of the first wireless data logger as part of the miniaturised series of MSR data loggers, the company is expanding its product range further towards wireless applications. The MSR385WD is a universal wireless data logger that features a very broad operating temperature range.

In order to ensure the temperature-resistance of the miniature transmitter modules, MSR Electronics falls back on many years of experience in the field of silicone casting technology for waterproof electronics applications. This technology can be used to optimally protect the wireless sensors of the transmitter modules, allowing for metrological applications even under harsh environmental conditions, for instance in continuous furnaces. The measured values are transmitted by means of transmitter modules equipped with either internal or external temperature, humidity and pressure sensors, in the unlicensed ISM frequency band at 868 MHz, across distances of up to 500 m.

The measuring and transmission intervals of the transmitter modules can be adjusted as follows: 1 s, 10 s, 1 minute, 15 minutes, 1 hour. Depending on the type of housing selected, the transmitter modules are supplied with power either by means of a rechargeable 260 mAh lithium-polymer battery or an 800 mAh Li-SOCl2 battery. Optimised power management ensures that — depending on the frequency of measurements and radio transmissions — the power supply to the MSR385SM miniature transmitter modules is warranted for up to five years. In a tiny housing such a compact transmitter module weighs approximately 25 g and measures just 35 x 55 x 25 mm externally.