The food, beverage, and agriculture industries are required to adhere to strict safety guidelines and regulations to prevent contamination and preserve the high quality of end products. Compliance to safety is so critical that even minor issues can impact produce quality, food safety and result in low yields, unexpected downtime and low-quality end products. Measurement instrumentation helps to prevent issues when growing or processing food and when producing beverages. Reliable and accurate process monitoring and the ability to provide tools are crucial to optimizing the entire production process, from growing the food to preparation, manufacturing, filling, packaging, and storage.

Vaisala’s measurement device portfolio includes instruments for measuring humidity, temperature, dew point, carbon dioxide (CO2), vaporized hydrogen peroxide, and barometric pressure.

Accurately measuring the humidity in the drying air is essential to optimize the drying process. It is important to keep the air dry enough to avoid microbial growth and keep products safe, and optimal conditions can only be achieved with accurate dryer controls. Optimizing the drying process provides a competitive advantage to manufacturers, saves energy and costs, and improves process consistency and end product quality. Typical applications include monitoring fluid bed and spray drying and controlling humidity levels in baking ovens.

As to what levels to set, this will depend on the product attributes, such as the desired aw value of the end-product. Since the optimal input volume varies based on the product you’re drying, a universal drying theory does not exist. It is basically up to the manufacturer to define the optimal exhaust air relative humidity or dew point levels. But in the drying phases, regardless of the level desired, knowing the values of parameters like sticky point, adsorption isotherm and glass transition point (Tg) and keeping the conditions stable with accurate and stable HUMICAP sensor measurement technology is essential and a key methodology for developing more cost and energy effective manufacturing processes.


Humidity and Temperature Probe HMP3 for general purpose humidity and temperature applications with exchangeable sensor

  • Available with field replaceable (HUMICAP R2 sensor)
  • RH accuracy up to 0.8 %RH
  • Temperature accuracy up to 0.1 °C (0.18 °F)
  • Temperature measurement range −40 … +120 °C (−40 … +248 °F)
  • Compatible with Indigo series of transmitters and Insight PC software

Dew Point and Temperature Meter Series DMT340 for demanding low humidity conditions 
  • Vaisala DRYCAP® sensor provides accurate, reliable measurement with excellent long-term stability and fast response time
  • Condensation-resistant
  • Unique auto-calibration feature
  • Graphical display and keypad for convenient operation
  • Optional alarm relays and mains power supply module
  • Integrated data logging with over four years of measurement history
  • LAN communication option
  • Traceable calibration (certificate included)

Compact Humidity and Temperature Probe HMP9 for rapidly changing environments 
  • Miniature probe head with low thermal mass for superior response time
  • RH accuracy up to 0.8 %RH
  • Temperature accuracy up to 0.1 °C(0.18 °F)
  • Temperature measurement range −40 … +120 °C (−40 … +248 °F)
  • Sensor purge provides superior chemical resistance
  • Modbus RTU over RS-485
  • Compatible with Indigo transmitters and Insight PC software
  • Traceable calibration certificate: 6 points for humidity, 1 point for temperature
  • M10×1.5 cable gland included for mounting the probe head