Emerson Alco 065405 Moisture Indicator

The Emerson Alco 065405, also identified as the HMI-1TT2 moisture indicator, is a critical diagnostic component for commercial refrigeration monitoring. Designed with a 1/4" sweat ODF connection, this hermetic leak-free indicator provides a clear visual interface to determine the moisture content of the system’s liquid line. It is engineered for broad field applications, supporting CFC, HCFC, and HFC refrigerants, including high-pressure R-410A systems. Featuring a 680 PSI maximum working pressure, the heavy-duty brass body and glass-to-metal seal ensure structural integrity under fluctuating thermal loads. The large viewing lens utilizes a high-sensitivity color indicator to detect trace moisture levels, helping technicians prevent acid formation and compressor motor burnout. For service contractors, installing an Emerson hermetic sight glass is the most reliable method for verifying a full liquid line and ensuring the system is dehydrated after an HVAC system evacuation.

• Universal Compatibility: Works with all standard halogenated refrigerants and associated mineral, AB, and POE lubricants.
• High Pressure Rating: Rated for up to 680 PSI MOPP, making it suitable for modern high-pressure refrigerant cycles.
• Hermetic Construction: Solid brass body with a fused glass lens prevents leak paths common in bolted configurations.
• Wide Angle Viewing: Large lens provides high visibility for detecting bubbles, flash gas, or moisture-driven color changes.
• Precise Diagnostics: Direct replacement for Alco HMI series indicators to maintain OEM system specifications.

How do I interpret the color change in the HMI-1TT2?
The Emerson 065405 uses a chemically treated paper that changes color based on the parts per million (PPM) of moisture. Blue indicates a dry system, while pink or red signals a high moisture concentration requiring a filter drier replacement.

Is the 1/4" sweat connection compatible with R-410A?
Yes, this 1/4" ODF moisture indicator is designed to handle the higher operating pressures of R-410A, provided the system pressure does not exceed 680 PSI.

Can this sight glass detect a low refrigerant charge?
Yes, an HVAC sight glass allows you to observe bubbles or foaming in the liquid line, which typically indicates a low charge or a restriction upstream of the indicator.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.