Monday, June 27, 2016

Humidity and Temperature Transmitters for Demanding Humidity Measurement

Vaisala Humidity sensors and transmitters for process measurement and control
HMT330 Series Humidity and Temperature Transmitters
Courtesy Vaisala
Humidity, the amount of water vapor in the atmosphere or a gas, can be an important measurable attribute of an industrial process. Many are aware of the measurement of relative humidity in HVAC applications and its impact on human comfort in occupied spaces, but the measurement of water vapor in air can be a required measuring point in many other processes that pose far greater challenge.

In addition to common wall or duct mounting applications, where the instrument is easily inserted or placed into the environment to be measured, there are applications that call for special adaptations to the instrument or sensing probe.
  • High pressure
  • Vacuum
  • High temperature
  • High humidity
  • Pressurized pipelines
  • Presence of chemical contaminants
Meeting the full range of industrial process control operations requires stable measurements and the choice of multiple configurations and options to customize the instrument to the process demands. Here are some features worth considering.
  • Multiple variants to match the basic process requirement
  • Full 0 to 100% humidity measurement range up to +180°C (+356°F)
  • PT 100 RTD for accurate temperature measurement
  • Pressure tolerance up to 100 bar
  • Superior sensor accuracy and stability
  • Graphic display and keypad for local operation
  • Multilingual user interface
  • Good chemical tolerance
  • Corrosion resistant housing
  • Delivered with multi-point NIST traceable calibration certificate
  • Analog outputs, RS232/485, WLAN/LAN
  • MODBUS protocol support (RTU/TCP)
  • Long term manufacturer warranty
While not all processes may require, or benefit from, the inclusion of all the listed features and capabilities, reviewing what is available and considering which features may provide better operability in your process can be beneficial. I have included a data sheet below that illustrates the HMT330 Series of humidity and temperature transmitters from Vaisala. Share your humidity measurement challenges with a product specialist. Combining your process knowledge with their product application expertise will produce solid solutions.