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

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  • Weight
    1.55 kg
  • SKU

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.

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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.

This version of the module includes signal conditioners that convert the Pt100 sensors to 4 to 20 mA outputs. The cheaper CMS-121 version presents the Pt100 sensor signals directly.

  • "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

Faulty Goods and Warranty

Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.

Our standard warranty period is 12 months from the date of purchase unless stated otherwise.

Other warranty periods:

Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years

Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.

Returns Policy

If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.

Please note:

  • The product returned will attract a 20% restocking fee.
  • The customer must pay the delivery costs.
  • Non standard, custom made or a specially manufactured or imported products are not returnable.
  • Semiconductors, books and software are not refundable

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