Wet/Dry-Bulb Psychrometer Humidity Measurement Module 4-20mA

(0 review)

SKU : CMS-123
Quantity on Hand : 0
Skill Level : Assembled and Tested

Buy 10, Get 5% Off!
Buy 100, Get 10% Off!

545.00 545.0 USD 545.00


Not Available For Sale

  • WeightMajor
  • WeightMinor

This combination does not exist.

Add to cart

Description: Wet/Dry dual Pt100 thermometer module with 4 to 20 mA outputs for high accuracy relative humidity measurement, or humidity measurement in high temperature or constantly wet environments.The Comeco RHU is designed to measure relative humidity in air and other gases and gas mixtures utilizing the well-known method of "dry" and "wet" thermometers. It uses 2 identical class 'A' RTD sensors mounted in stainless steel sheaths mounted on a stainless steel plate. The plate can be installed inside or outside drying or moistening chambers. The wet/dry bulb method for determining humidity is especially suitable in areas of high humidity such as fog rooms for horticulture.

The method of "wet/dry” temperature difference provides high accuracy in RH measurement. For this accuracy to be ensured, it is absolutely necessary to keep the "wet" sensor always wet and to guarantee the evaporation from its surface. For this purpose, this module is equipped with a special moistening system. It is also important to assure continuous gas movement along the sensors during the measurement process. Together with a COMECO RH-control instrument (RT180 or RT390), RHU can be widely used in areas where standard capacitance RH probes are not applicable: high-temperature chambers, high-accuracy RH measurement, etc.

The formulas for converting wet and dry temperatures to a humidity for air can be found at the 4WX.COM Weather Information Center.


  • "Dry" thermometer: Pt100, 4-20 mA out
  • "Wet" thermometer: Pt100, 4-20 mA out
  • Conversion range: 0% to 100% RH
  • External Mounting range: -50 to 200 °C
  • Internal Mounting range: -20 to 120 °C
  • Measurement Accuracy: 1% RH
  • Response Time: 2 s
  • Manufacturer's Part No: RHUS-BD-TT