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Design and Implementation of Wireless Sensor Network for Freeze Dryer

  • Cho, Young Seek ;
  • Kwon, Jaerock ;
  • Choi, Seyeong
  • Received : 2014.08.04
  • Accepted : 2014.09.22
  • Published : 2015.03.31

Abstract

A wireless sensor network (WSN) is designed and implemented for a freeze dryer. Freeze-drying technology is widely used in the fields of pharmacy and biotechnology as well as the food and agriculture industries. Taking into account the demand for high-resolution pressure and temperature measurements in a freeze dryer, the proposed WSN has a significant advantage of creating a monitoring environment in a freeze dryer. The proposed WSN uses a ZigBee/IEEE 802.15.4 network with an altimeter module that contains a high-resolution pressure and temperature sensor with a serial digital data interface. The ZigBee network is suitable for low-energy and low-data-rate applications in the field of wireless communication. The altimeter module is capable of sensing pressure in the range of 7.5-975 Torr (10-1300 mbar) and temperature in the range of $-40^{\circ}C$ to $125^{\circ}C$ with a DC power consumption of $3{\mu}W$. The implemented WSN is installed in a commercial laboratory freeze dryer in order to demonstrate its functionality and efficiency. A comparison with the temperature profile measured by a thermocouple installed in the freeze dryer reveals that the resolution of the temperature profile measured by WSN is superior to that measured by the thermocouple.

Keywords

Microcontroller;Pressure sensor;Temperature sensor;Wireless sensor network;ZigBee

References

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Acknowledgement

Supported by : National Research Foundation of Korea (NRF)