Emerson Alco 065407 Moisture Indicator

The Emerson Alco 065407 (Model HMI-1TT4) is a high-performance 1/2" ODF sweat moisture indicator designed for rigorous monitoring of refrigerant liquid lines. Engineered with a 680 PSI maximum working pressure, this hermetic sight glass provides reliable leak-free performance and clear visibility for CFC, HCFC, and HFC refrigerants. The crystal-clear viewing lens features a highly sensitive moisture indicator element that changes color based on the parts-per-million (PPM) of water concentration in the system, allowing technicians to accurately diagnose refrigerant moisture levels before acid formation damages the compressor. Its solid brass construction and extended copper tails ensure easy brazing into the circuit without risk of seal degradation. This HVAC liquid line indicator is essential for confirming a full head of liquid at the expansion valve and verifying the effectiveness of the system’s filter drier during routine maintenance or after-service recovery.

• Wide Refrigerant Compatibility: Fully compatible with mineral, alkylbenzene, and POE oils, making it a versatile HMI-1TT4 sight glass for various field applications.
• High Pressure Rating: The 680 PSI MOPP rating ensures safety and reliability in high-pressure R-410A systems and traditional R-22 retrofits.
• Large Viewing Port: Provides a wide-angle view for immediate detection of bubbles or flash gas in the liquid line.
• Corrosion-Resistant Housing: The Emerson Alco moisture indicator features a robust brass body to withstand harsh mechanical room environments.

What does a yellow indicator signify in this sight glass?
A shift to yellow indicates that the moisture concentration has exceeded acceptable levels for the specific refrigerant type, signaling the need for a filter drier replacement to prevent system acidification.

Is this moisture indicator rated for R-410A systems?
Yes, the HMI-1TT4 model is rated for 680 PSI, making it suitable for R-410A high-pressure liquid lines as well as standard CFC/HCFC systems.

Can this unit be brazed without disassembly?
The 1/2" sweat connections should be wrapped with a wet rag during installation to protect the internal indicator element from excessive heat, despite its hermetic design.

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.