Sporlan 700509-002 Sight Glass

The Sporlan 700509-002, model PSG-7S, is a high-performance moisture liquid indicator designed for critical monitoring in commercial and residential refrigeration systems. Featuring 7/8" ODF solder connections, this sight glass integrates seamlessly into the liquid line, providing real-time visibility of refrigerant charge and moisture levels. The PSG series is engineered with solid copper extended ends, allowing for rapid brazing without the need for disassembly. It is built to withstand high-pressure environments with a 650 PSI rating and is compatible with a wide array of refrigerants, including R-22, R-410A, R-134A, and R-404A.

For service technicians, the PSG-7S 7/8" sight glass eliminates guesswork during system diagnostics. The highly sensitive moisture indicator provides a distinct color change—typically green for dry and yellow for wet—to signal when a filter-drier replacement is necessary to prevent acid formation or copper plating. The large, clear viewing port remains protected from internal system debris by an integrated filter pad, ensuring long-term HVAC system visibility under varying thermal loads.

• Multi-Refrigerant Compatibility: Works effectively with modern and legacy refrigerants such as R-410A, R-134a, R-404A, and R-22.
• Extended Copper Fittings: 7/8" ODF sweat connections facilitate easy field installation while protecting the glass-to-metal seal from heat damage.
• Reliable Moisture Detection: Highly sensitive indicator paper provides clear, reversible color changes based on parts per million (PPM) saturation.
• Robust Pressure Rating: UL listed for operating pressures up to 650 PSIG, making it suitable for high-pressure heat pump applications.
• Simplified Maintenance: Extra-large full-view glass allows for immediate detection of bubbles, signaling refrigerant shortage or line restrictions.

How do I prevent damage to the indicator during brazing?
Use a wet rag or thermal blocking agent around the fittings and the base of the body. Direct the torch flame away from the center of the sight glass to prevent condensation from washing away the indicator salt.

What do bubbles in the PSG-7S sight glass signify?
While bubbles can indicate a low refrigerant charge, they may also signal a restricted liquid line or a pressure drop across the filter-drier. Always verify subcooling before adding refrigerant.

Can the moisture indicator element be replaced if it gets contaminated?
The Sporlan PSG-7S is a fused glass model; if the indicator becomes permanently discolored due to extreme system contamination or acid, the entire unit typically requires replacement to ensure accurate monitoring.

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.