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Bob Hardy, founder of RH Systems, walks through what makes our Duet revolutionary for technicians.

The Duet

The Duet from RH Systems is a state-of-the-art chilled mirror hygrometer developed and manufactured in the United States. Independently designed by Bob Hardy, RH Systems founder, the Duet blends traditional chilled mirror technology with modern enhancements to create a highly precise, portable standard for dual Dew and Frost Point measurement along with PPM and relative humidity.
Dual Measurement Mastery
Optimizing the chilled mirror principle, the Duet’s precision engineering and advanced
measurement algorithms deliver accurate, direct humidity measurements, including dew
point, frost point, %RH, ppm, ambient temperature, and pressure.
Precision & Portability
Ratiometric resistance measurement with dual embedded thermometer. Weighs 20-25 lbs with custom Pelican case for on-site measurement.
Harmonious Dew-Frost Discrimination
FrostLock establishes a known condensate state --either frost or super-cooled dew --at mirror temperatures below 0°C, eliminating mixed or ambiguous conditions. This harmonious precision in dew-frost discrimination resolves long-standing industry misconceptions, ensuring accurate calculation of dependent humidity values

Design Based On Fundamental NIST Developed Principles

A system capable of continuous, high-accuracy humidity generation over a wide range of humidity, temperature, and flow rates.

Specifications

Operation

Documents

Warranty

Specifications

Specifications

The Duet specifications are outlined below

Model: Duet Duet-HT
Measuring Range:
Frost/Dew Point -60 °C FP to 20 °C DP -40 °C FP to 70 °C DP
Relative Humidity 0.1 %RH to 100 %RH
Temperature -100 °C to 100 °C * (calibrated range –20 °C to 70 °C)
Accuracy:
Frost/Dew Point ± 0.1 °C
Temperature ± 0.07 °C
Reproducibility:
Frost/Dew Point ± 0.05 °C
Temperature ± 0.05 °C
Inputs/Outputs:
Digital Communication RS-232, USB-B, TCP/IP
Analog Outputs 2 Channel, 0-5 V or 0-20 mA (user configurable)
Second Mirror PRT Pt100, 4-wire connection
Miscellaneous:
Mirror Cooling 3-stage Thermoelectric
Measuring Head Cooling Air
Display Color Touch Screen
Gas Couplings ¼” or 6 mm Swagelok (specify)
Sample Gas Flow Rate 0.2 l/min to 2 l/min
Sample Gas Circuit PFA Heated, Stainless Steel
Sample Gas Max Pressure 2 bara
Environmental:
Operating Temperature 10 °C to 30 °C
Storage Temperature -20 °C to 60 °C
Ambient Humidity 90 %RH max., non-condensing
Power Requirements:
Voltage 100 – 240 VAC, 50/60 Hz
Power Consumption 200 W 300 W
Physical:
Height 155 mm
Width 440 mm
Depth 410 mm
Weight 12 kg
We reserve the right to change design or technical data without notice.

* Calibrated range -20 °C to 70 °C

Operation

Operation

Coming Soon!

Warranty

Warranty

RH Systems (RHS) warrants the products it manufactures or distributes to be free of defects in material and workmanship under normal use and service when operated within the specified design limitations for a period of 12 months from date of initial shipment. Under this Warranty, RHS will, at its discretion, repair or replace any component that upon examination by RHS or its duly authorized representatives proves to be defective during the warranty period provided the system is returned to the factory for inspection and repair shipping prepaid. Improper or unauthorized maintenance, storage, repair, or alteration of any kind by personnel other than RHS or its duly authorized representatives may void all warranties. Warranty may also be voided for misuse, neglect, accident, corrosion, and improper installation. This Warranty is exclusive and in lieu of any and all other warranties of merchantability, fitness for a particular purpose, or any other warranty, expressed or implied, and all other liabilities and obligations on the part of RHS. RHS will not be liable for any other claims or damages, either direct, indirect, or consequential arising out of the use of its products.

Schedule Consultation

Let's Chat
Joshua Stine
Chief Relationship Engineer

At RH Systems, we’re constantly pushing ourselves towards advancing our products and services for a wide range of clients, setting a new standard for accuracy and paving the way for future breakthroughs.

Customer satisfaction is the foundation of our reputation, so we never take a one-size-fits-all approach. We work with you to understand your needs and provide customized solutions that work seamlessly right from the jump.

Ready to chat with our Sales Team? Send an email to sales@rhs.com and we’ll get right back to you.

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Fill out the form below and we’ll be in touch soon.

    Frequently Asked Questions

    What are your hours?

    9am – 5pm Arizona Time
    Where are you located?

    1225 West Houston Ave, Gilbert, AZ 85233
    Do you offer virtual or in-person training?
    Yes, please contact sales@rhs.com for a quote.
    What products do you service?
    We service the entire RH Systems line of products, you may find our products here.
    Do you service products not manufactured by RH Systems?
    Yes, please contact sales@rhs.com for more information.
    Are you accredited?

    As a NVLAP accredited laboratory, RH Systems is reassessed to ensure that our quality and practices maintain such standards (NVLAP Laboratory Code 600161-0). The National Institute of Standards and Technology (NIST) administers the National Voluntary Laboratory Accreditation Program (NVLAP), which accredits public and private laboratories based on evaluation of their technical qualifications and competence to carry out specific calibrations or tests. 


    NVLAP provides an unbiased third-party evaluation and recognition of performance. Accreditation signifies that a laboratory has demonstrated compliance with NVLAP management and technical requirements, including quality systems, personnel, accommodation and environment, test and calibration methods, equipment, measurement tractability, sampling, handling of test and calibration items, and test and calibration reports. Learn more here.

    Where can I find the range for each unit?
    On our Product Page, click the specific unit. Then, click on download brochure.

    REVIEWS

    “Bob is more interested in the subject matter and the science behind his products than in making a sale. He wants to make sure that a solution will work for us. Beyond their products, RH Systems will continue to innovate and amaze the humidity community with new systems and instruments that will advance the metrological community.”

    Tee Yee Zheng Supertron Sensing

    RH Systems helped me understand the systems better. That makes me ask better questions and ultimately become a better technologist. They show that their customers are clearly everything. From the way they treat us, you can tell that people must absolutely love working there.

    Paul Gomez Sandia National Labs

    “Bob and the staff at RH Systems are the greatest and their undying devotion to supporting the community is greatly appreciated. They are prepping the next generation of professionals in our community for a continuation of support unparalleled in temp and humidity and should be a beacon for all metrology.”

    Joseph Rindone Metrologist at Paladin Metrology Advocates

    “RH Systems goes the extra mile, without fail. And they stand behind what they do. Customer service is a dying art. RH Systems still gives you one-on-one attention and they always pick up the phone. In our industry, we have a lot of red tape. Bob helps us navigate this and wants to take on the challenge of forming a custom solution. He is invested in what his customers need. That speaks volumes.”

    Roger Free Calibration Technician at Haleon

    “RH Systems has created the best frost point generator in the world. The G3 is very fast, has high precision and is still very easy to use. The three separately flow-controlled outputs give you maximum flexibility when connecting measuring devices.”

    Helmut Hager CEO, Techmetrics

    “I’ve never met anyone who wants to do more than what his customers expect than Bob. I respect and admire that philosophy so much! You will never regret doing business with Bob Hardy!”

    Janne' Mummert Business Consultant, JM Consulting
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