4 to 20 mA Humidity Probe

Available for backorder
  • Weight
    0.07 kg
  • SKU
    CMS-100

Loop powered probe for measuring the humidity of air or non-agressive gasses. 2 wire, 4 to 20 mA outputs signal

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The RHB humidity probe from Comeco measures relative humidity of air and non-aggressive gases at atmospheric pressure, and transforms it into standard 4 to 20 mA 2-wire signal. Main features of the RHB transducer are the very fast response time and the short recovery time, which allows better control system parameters, as well as the reduced accuracy influence of the mounting capacitances. The probe has a cable outlet and can be equipped with a stainless steel sintered filter for sensor protection. Thanks to its simple and robust design and low price, the RHB probe can be widely used in HVAC storage control systems as well as for some food industry applications.

Please note - in situations of high humidity (>90%) condensation on the sensor surface can occur which will severely affect the accuracy of readings. If this does occur the probes will work again normally after room temperature drying.

It is recommended in high humidity situations the Sintered Filter option be used. See part no. CMS-101.

Even with a sintered filter, if RHB probes are operated over long periods of time (weeks) at 99% RH with condensation, the customer must take care to remove the filter and to dry the sensor occasionally.

If this is unacceptable then it will be necessary to use the “DRY-WET BULB” method (see our RHU model).

  • Solid-state sensing element
  • Loop Powered
  • 4 to 20 mA, 2-wire
  • ≤4.0% Measurement Error
  • Sintered Filter
  • Comeco Part No. RHB-1PV-X
  • Power supply: 8 to 36 VDC
  • Measurement Range: 0% to 100% RH
  • Time Constant: 1 second
  • Recovery Time: 2 seconds
  • Output Signal: 2 wire, 4 to 20 mA
  • Maximum Load: 750 Ω at 24 V, 20 mA
  • Measurement Error: ≤4.0% full span
  • Temperature Drift: ≤1.5 %RH
  • Hysteresis: ≤1.5 %RH
  • Self-heating Error: ≤0.01 %RH/mA
  • Supply Voltage Dependence: ≤0.005 %RH/V

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

Full Terms and Conditions

By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.

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