Do you need to measure absolute humidity in temperatures up to 350°C (662°F)?

we have the right sensor for you

Absolute Humidity Analogue Sensor HT350

High temperature absolute humidity analogue sensor using latest heat pipe technology, suitable for process temperatures as high as 350°C (662°F).
Measuring of absolute humidity as well as the process temperature.
The humidity sensor works on the dew point & heat pipe principle, based on a stable thermal system.
The robust sensor tip is completely sealed and allows to be used in polluted environment applications. Therefore, easy cleaning is possible, if necessary.
Two versions, with active and passive cooling respectively are available.
Passive cooling is recommended to be selected for applications with polluted environments.


  • Absolute humidity measuring
  • Temperature measuring
  • Direct placement in process room
  • Sealed metal measuring tip
  • Contamination resistant
  • Maintenance-free
  • Easy mounting

Technical Data

Humidity measuring range 0 … 100 Vol% @ t > 100 °C
Humidity accuracy at 20Vol%: ± 3,5%
   at 90Vol%: ± 1,5%
Response time (t90)
          with increase of 20 … 100Vol%: <10s
          with decrease of 100 … 20Vol%:  <60s Stabilization
          after switching approx. 10min
Temperature measuring range 0 … 350 °C
Temperature accuracy 0,5 ° ± 0,75 %  of range
Operating temperature Probe          0 … 350 °C
  Electronics   5 … 60 °C
            Moisture 4 … 20 mA, Load < 600Ω
  0 … 10V optional,  Load >600Ω
  short circuit protected
          Temperature 0-10V …Load > 600Ω,
  short circuit protected
  RS 485  Interface
Power supply 12 VDC
Current consumption 8,5 A
Electrical connection terminal blocks
Probe dimensions  
             Length                140 mm + 50 mm
             Diameter 26,9mm/3mm/4mm
Electronics Plastic Housing
Humidity Copper, Nickel
Temperature sensor V4A, 1.4301
Protection rating Probe IP67,   Electronics IP 65


  • Drying systems
  • Baking ovens
  • Ceramic dryers
  • Kilns — tunnel kilns
  • Food industry
  • Animal feed production
  • Cement industry
  • Wood industry