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CMH-RPC | Precision Chilled Mirror Dewpoint Hygrometer
Featuring 3-stage chilled mirror technology and integral cooling, the CMH-RPC delivers precise and continuous moisture measurements up to -95 °C frost/dew point, translating to 37 ppb(V), making it an indispensable tool for high-accuracy applications.
The CMH-RPC offers unmatched accuracy for critical applications in laboratories and research facilities and as a reference standard for calibrating other moisture measurement instruments, delivered ready for immediate bench-top installation.
Our Model CMH Chilled Mirror Hygrometer accurately measures the dewpoint of a gas by cooling a mirrored surface, over which the gas flows until a layer of dew forms on the surface.
The Chilled Mirror Dew Point Hygrometer utilises a 3-stage cooler combined with an integral refrigeration unit to measure the dewpoint in gases from below -95 °C to 20 °C (-139 °F to 68 °F) dewpoint with an accuracy of ±0.2 °C dewpoint.
This primary measurement principle makes the CMH-RPC the ideal instrument for laboratory, scientific, and research applications and a reference instrument for checking and dewpoint calibration of dewpoint meters, dewpoint transmitters, dew meters and dewpoint analysers.
The optional pressure transducer allows for displayed pressure measurements, enhancing the instrument’s utility and application range.
Whatever the challenge — Alpha Moisture Systems has you covered.
- Highly customised solutions
- Trusted by industry leaders
- Distributors worldwide
- Over 30 years experience
Precision and reliability for advanced applications
Key features
- High accuracy of ±0.2 °C (±0.36 °F) dewpoint, suitable for laboratory, scientific research and reference applications
- Backlit LCD that displays readings in °C or °F dewpoint and ppm(V), offering clarity and flexibility in data presentation
- Sample pressure of 0 to 20 bar (0 to 300 psia) maximum
- Analogue output at 0-5 VDC, 4-20 mA, 0-10 VDC, or 0-20 mA
- Optional temperature and pressure sensors to expand measurement capabilities and provide comprehensive environmental monitoring
- RS232 serial communications for straightforward integration with data logging and monitoring systems, as well as printers
- Two programmable alarm relays for implementing threshold-based actions or alerts, improving process control
- Automatic Balance Control (ABC) for fast and straightforward measurement and control, simplifying operation and ensuring optimal performance
- Supplied with a calibration certificate traceable to National and International Humidity standards, guaranteeing precision and compliance
Technical Data
General | |
| Documentation | Instruction manual, calibration certificate |
Sensor | |
| Sensing Element | Three Stage with Additional Refrigeration |
| Dewpoint Range | -90 °C to +20 °C dewpoint ( -130 °F to +68 °F) at 22 °C ambient temperature |
| Certification | NPL traceable |
| Approvals | CE, UKCA |
| Factory Calibration | Supplied with a calibration certificate traceable to National and International Humidity standards |
| Accuracy | ± 0.2 °C (±0.36 °F) dewpoint |
| Sample Flow Rate | 0.25 - 2.4 L/min (0.5/5.0 SCFH) |
Electrical | |
| Electromagnetic Compatibility (EMC) | Complies with BS EN ICE 61326-1 |
| Power Supply | 110 Vac or 230 Vac, 50/60 Hz (specified at order) |
| Alarms | Dual alarm capability, user programmable, can be set for latching or auto-reset mode |
| Serial Communications | RS232 communication with terminal, printer or computer Remote programming Data output such as dew point and alarm status |
| Sampling Rates | 0 to 5 bar (0 to 75 psia) |
Mechanical | |
| Dimensions in mm (H x W x D) | 600 x 520 x 435 |
| Weight | 47 kg |
| Mechanical Warranty | 12 months in case of defective parts or faulty workmanship |
Downloads
What's in the box
CMH-RPC Chiled Mirror Hygrometer
CMH-RPC Manual
CMH-RPC Power Cable
Calibration Certificate
Applications
Clinical DiagnosticsIn clinical diagnostics, chilled mirror hygrometers are used to maintain optimal humidity levels during the analysis of health and disease markers. This precise moisture control is vital for accurate testing of metabolic markers, liver function, heart disease indicators, and more, ensuring reliable diagnostics for various health conditions.
Environmental MonitoringEnvironmental testing, critical for detecting pollutants in air, water, and soil, relies on chilled mirror hygrometers for accurate humidity measurement. These devices help verify that products and equipment will perform under real-world environmental conditions, essential for assessing climate and mechanical factors like temperature, humidity, shock, and vibration.
Food TestingEnsuring food safety and quality begins with proper humidity control, made possible by chilled mirror hygrometers. These devices are crucial for accurately analysing food chemistry, microbiology, nutrition, and other key safety parameters in labs or the field, contributing to consumer safety and product reliability.
Forensic LaboratoriesForensic laboratories depend on chilled mirror hygrometers to maintain precise environmental conditions for evidence analysis. Accurate humidity measurement is essential for the examination of trace evidence, fingerprinting, DNA identification, and the assessment of body fluids, ensuring the integrity of forensic analyses.
Materials ResearchIn materials research, chilled mirror hygrometers play a key role in studying the properties of biomaterials, ceramics, polymers, and more. Accurate humidity measurement allows for a deeper understanding of the relationship between material structure and properties, facilitating the development of new materials with specific characteristics.
Pharmaceutical LaboratoriesPharmaceutical development benefits from the use of chilled mirror hygrometers, ensuring controlled humidity during critical stages of drug formulation and preclinical testing. These devices are essential for accurate pharmacology services, ADME-Tox testing, and biomarker analysis, contributing to the efficacy and safety of new drugs.
Aerospace and Aviation In aerospace and aviation, maintaining ideal humidity levels is critical for passenger comfort and equipment longevity. Chilled mirror hygrometers are used to measure humidity levels in aircraft cabins and environmental control systems accurately, ensuring safe and efficient flight operations.
Frequently Asked QuestionsIf you have a question that’s not answered below, please contact us
Where should I install the CMH-RPC Chilled Mirror Hygrometer?
The CMH-RPC should be installed in safe areas as it is not certified for hazardous locations.
How much does the CMH-RPC weigh and what are its dimensions?
Where can I purchase a CMH-RPC Chilled Mirror Hygrometer?
What is the lead time for a CMH-RPC Chilled Mirror Hygrometer?
Can the Chilled Mirror be cleaned of contaminants?
Is the CMH-RPC fully compatible with the Calibration Systems you manufacture?
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Moisture Systems
If you require a customised trace moisture measurement solution, book a consultation with our expert technical team and find out how you can increase the efficiency and productivity of your operations.
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