W-LINK pro

16. December 2020 | All articles, Wurm /

Wireless-based sensor for temperature measurement

The wireless sensor delivers precise goods temperatures for HACCP-compliant documentation and is available in a number of versions, both with and without batteries.

Precise temperature measurement is the prerequisite for HACCP-compliant documentation. However, it is not so easy to install a temperature sensor in an appropriate place in practice. Either the cable disrupts the goods presentation or it is difficult to lay, such as with mobile refrigeration units (e.g. promotional units).

This is how the idea came about at Wurm Systeme to develop a wireless sensor. The challenge was to go beyond the performance of typical sensors. As a rule, these can only measure medium temperature, i.e. moving air. But products in refrigeration units are exposed to other factors, which means that the actual goods temperatures deviate from the ambient air temperature. For instance, with foil-wrapped goods, illumination causes a kind of greenhouse effect that raises the temperature inside the foil disproportionately. A special construction meant that W-LINKpro was able to simulate this effect: the measuring cell is positioned behind a foil in the housing of the sensor and is therefore exposed to similar conditions to the packaged goods. For this reason the temperature recorded is more realistic than one based merely on the air temperature.

Like all wireless sensors, the W-LINKpro needs an electricity supply. Energy is required not least for transmitting data. The goods illumination is used as the energy source for W-LINKpro. Equipped with solar cells and a small energy store, a fully loaded sensor can even transmit for several days in the dark.

There are a number of application cases in practice for which corresponding versions have been developed. For instance, there are sensors that can be operated well on the price tag rail of a refrigerated shelf. An external sensor with a 10 cm or 1 m sensor cable, on the other hand, can be positioned well in refrigerated islands or cold-storage rooms so that the sensor measures the correct temperature in the best possible position but also guarantees the wireless connection and light nergy supply.

The W-LINKpro-B model with integrated battery is an alternative where no sufficient lighting can be guaranteed. Battery life with normal use is more than 10 years. Even direct use in a deep freezer has been accounted for. The low temperatures do not impede the battery-operated sensor in the slightest. The W-LINKpro-B is also available with an internal and external sensor for flexible use.

The sensor is equipped with two keys for temporary use and in mobile seasonal furniture. It can easily be signed in to or out of the W-LINK-CAN receiving unit or Multigate via these keys. There is no need for complicated configuration adjustments.

This makes the W-LINKpro, with its various versions, an extremely flexible sensor that guarantees a more precise temperature measurement than many traditional sensors and also does without cable connections.


  Sarah Schröter

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