Parker Refrigeration Specialties 112618 Float Switch

The Parker Refrigeration Specialties 112618 Float Switch is a heavy-duty LLSS float switch with leads designed for precision liquid level monitoring in industrial ammonia and halocarbon systems. As a direct replacement for 109637, this unit features a stainless steel AISI 304L construction for the float chamber, ensuring compatibility with aggressive refrigerants and secondary coolants. The SPDT (Single Pole Double Throw) switch mechanism is housed in molded UV-resistant plastic with a rugged aluminum cover, providing IP65 rated protection for demanding plant environments. Designed for extreme thermal cycles, it maintains operational integrity from -100°F to 150°F at a maximum operating pressure of 450 psig (31 bar). The 24-inch (610 mm) leaded electrical connection facilitates versatile field wiring for 120/240 VAC or 125 VDC circuits, making it an essential component for high-side or low-side level control and safety cut-out applications.

Technical Benefits for Contractors

• Direct Retrofit Compatibility: Engineered as the official successor to the 109637 model, ensuring drop-in replacement without piping modifications.
• Corrosion Resistance: The 304L stainless steel assembly eliminates the risk of rust and material degradation in high-moisture refrigeration galleries.
• Flexible Power Logic: Supports 120 VAC (10A), 240 VAC (10A), and 125 VDC (0.5A), allowing for integration into various PLC or mechanical control loops.
• Broad Fluid Range: Rated for a specific gravity range of 0.57 to 1.7, covering almost all standard industrial refrigerants.
• Vibration Resistant Design: The 2-inch differential leaded connection helps mitigate nuisance tripping caused by turbulent liquid levels.

Common Installation Questions

What are the primary tank connection sizes for the LLSS series?
The assembly typically accommodates 3/4"-14 FPT or 1" BW float chamber fittings, with 1/2" NPT for the switch housing, ensuring a secure seal in pressurized systems.

Can this float switch be used in low-temperature CO2 systems?
Yes, the Parker 112618 is rated down to -100°F (-75°C), making it suitable for low-temperature applications provided the operating pressure does not exceed 450 psig.

How do I verify the electrical rating for DC control circuits?
For DC applications, this switch is rated for 0.5 Amps at 125 VDC. Always verify your relay coil in-rush current does not exceed these parameters during commissioning.

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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.