English Product Name

Overview

The Alpha Moisture Systems CMH-P2 is a portable, primary-standard chilled-mirror hygrometer engineered for high-accuracy dew point measurement across demanding industrial and utility environments. Unlike indirect sensing technologies—such as capacitive or aluminum oxide sensors—the CMH-P2 employs the fundamental physical principle of condensation thermometry: direct optical detection of dew or frost formation on a temperature-controlled mirror surface. This benchmark method delivers inherently traceable, drift-free measurements with metrological integrity validated against international humidity standards. Designed and manufactured in the UK under ISO 9001:2015 quality management systems, the CMH-P2 provides full measurement traceability to the UK’s National Physical Laboratory (NPL) and other accredited national metrology institutes. Its robust mechanical architecture, combined with modular sensor configuration and field-deployable form factor, makes it suitable for both routine verification and critical compliance monitoring—particularly where regulatory adherence to IEC 62271-1 (high-voltage switchgear), IEEE C37.122 (SF₆ gas handling), or ISO 8573-1 (compressed air purity) is required.

Key Features

• Primary-standard chilled-mirror sensor with chemically resistant wetted materials (316 stainless steel, PTFE, Viton), enabling reliable operation in aggressive process gases including SF₆, H₂, natural gas, and compressed air.
• Auto-compensated optical contamination control: proprietary thermal balance algorithm continuously corrects for mirror surface degradation without manual intervention or recalibration.
• Wide operational dew point range of −70 °C to +75 °C (−94 °F to +167 °F) achieved via selectable cooling configurations—standard thermoelectric or high-efficiency cascade modules—ensuring adaptability across drying, purification, and conditioning applications.
• Modular sensor deployment: supports both local and remote probe mounting, accommodating confined spaces, pressurized ducts, or hazardous area sampling via explosion-proof enclosures (ATEX/IECEx options available).
• Integrated vacuum pump option enables active sampling from low-pressure or ambient sources, while standard 1/4″ compression fittings support positive-pressure connections up to 150 psig.
• Multi-interface data acquisition: analog outputs (0–5 V, 4–20 mA, etc.) with user-defined scaling, RS-232 serial communication, and optional Bluetooth module for real-time wireless logging and remote diagnostics.

Sample Compatibility & Compliance

The CMH-P2 is certified for use with non-corrosive and mildly corrosive background gases typical in power generation, gas transmission, and industrial manufacturing. Its wetted components are compatible with SF₆ (per IEC 60480), compressed air (ISO 8573-1 Class 0–4), hydrogen (ISO 8573-8), and natural gas (ISO 10715). All calibration certificates include uncertainty budgets compliant with ISO/IEC 17025 requirements. The instrument supports GLP/GMP audit trails when paired with Alpha’s optional software suite, and its relay alarm outputs meet functional safety requirements for interlocking with dryer controls or gas-handling systems. Traceability documentation—including calibration reports with NPL-traceable references—is supplied with each unit.

Software & Data Management

Alpha’s proprietary DewPoint Manager software (Windows-compatible) enables configuration, real-time visualization, trend analysis, and report generation. It supports time-stamped data export in CSV and PDF formats, configurable alarm thresholds, and automated calibration log archiving. When deployed with the Bluetooth data acquisition module, the system complies with FDA 21 CFR Part 11 requirements for electronic records and signatures—including audit trail generation, user access controls, and data integrity validation. Historical datasets can be synchronized with enterprise SCADA or LIMS platforms via Modbus TCP or OPC UA gateways (available as add-on integration kits).

Applications

• Power industry: In-situ moisture monitoring of SF₆ insulation gas in circuit breakers, GIS, and transformers—critical for dielectric strength assurance and predictive maintenance per IEEE C37.122.2.
• Industrial gas drying: Verification of desiccant, refrigerant, and membrane dryer performance in pharmaceutical, food processing, and electronics manufacturing.
• Energy infrastructure: Humidity control in wind turbine nacelles, solar inverter enclosures, and hydrogen fueling station compressors.
• Calibration laboratories: Use as a transportable reference standard for validating secondary sensors (e.g., capacitive, tunable diode laser) in accordance with ISO/IEC 17025.
• Cleanroom and controlled environments: Continuous dew point surveillance for ISO 14644-1 classified spaces requiring <−40 °C dew point stability.

FAQ

Is the CMH-P2 suitable for measuring dew point in SF₆ gas?
Yes—the sensor’s 316 stainless steel and fluoropolymer wetted parts are fully compatible with SF₆, and the system meets IEC 60480 and IEEE C37.122 specifications for moisture-in-gas analysis.

Can the CMH-P2 operate under positive pressure?
Yes—standard configuration supports up to 150 psig; higher pressure ranges are available with custom pressure-rated sensor housings and isolation valves.

Does the instrument require periodic recalibration?
No scheduled recalibration is required due to its primary-standard design and auto-compensation for optical contamination; however, annual verification against a traceable reference is recommended for ISO 9001 or GxP compliance.

What cooling options are available for sub-ambient measurements?
Two configurations: standard single-stage thermoelectric cooling (down to −40 °C DP) and high-efficiency cascade cooling (−70 °C to +75 °C DP), both field-swappable.

Is Bluetooth connectivity included by default?
Bluetooth is an optional accessory module; the base unit includes RS-232 and analog outputs as standard.