Carrier HR81LG025 Flow Switch

Monitoring fluid velocity in critical industrial cooling systems requires industrial-grade precision, and the Carrier HR81LG025 Flow Switch delivers exactly that. This genuine OEM component, manufactured by IFM Electronic (Model SC0514) in Germany, is the standard replacement for Carrier GX and HX series chillers. Built for high-stakes environments, it utilizes a thermal dispersion principle to monitor liquid flow, ensuring your 30HXA or 30GX unit remains protected against low-flow conditions. With a robust IP67 rating, this calibrated flow sensor is engineered to withstand the moisture and thermal cycling typical of commercial mechanical rooms.

Operating on 24V AC/DC, the HR81LG025 features an adjustable set point ranging from 10 to 60 cm/s, allowing for precise field tuning based on specific system requirements. The sensor is equipped with a 5-pin micro DC connector and high-pressure-rated housing (capable of handling up to 300 bar in specific ST series configurations, though tailored here for Carrier liquid lines) to ensure a leak-free seal and reliable signal transmission. For technicians performing scheduled maintenance or emergency repairs, this drop-in replacement flow switch eliminates the compatibility issues associated with generic aftermarket sensors, maintaining the original factory safety logic of the chiller's control board.

• Universal Compatibility: Specifically engineered as a direct replacement for Carrier part number HR81LG015 and HR81LG025 in GX/HX chiller applications.
• Precise Switching: Features a normally closed (NC) contact with an 80 mA output, providing immediate feedback to the controller upon flow loss.
• Rugged Enclosure: The 316L stainless steel sensing face and IP67 protection ensure long-term resistance to corrosion and wash-down environments.
• Adjustable Sensitivity: The 10...60 cm/s set point range provides the flexibility needed to dial in flow detection for varying glycol concentrations and viscosities.
• Simplified Wiring: Integration is efficient with clear electrical labeling and a standardized 5-lead pin configuration for fast field termination.

Is this flow switch compatible with both water and glycol-based systems?
Yes, the IFM SC0514 technology used in this switch is designed for reliable detection in water and various coolant mixtures commonly found in Carrier industrial HVAC systems.

Does this unit come with the mounting adapter?
The HR81LG025 is typically provided as the sensor head; however, it is designed to interface with standard 1/4" NPT process connections or existing Carrier-specific flow tees. Always verify your existing fitting's threads (typically G 1/4 or 1/4" NPT depending on the specific chiller manifold) before installation.

What is the primary function of the 5-pin connector?
The 5-pin micro DC connector provides a secure, vibration-resistant link for both power (24V) and the switching signal, ensuring the HVAC safety circuit remains closed only when adequate flow is detected.

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.