McDonnell & Miller FS8-WJ Switch

1" BSPT, SPDT Snap Switch, General Purpose Liquid Flow Switch for up to 160 PSI Max Pressure with 1", 2", 3", and 6" Stainless Steel Paddles (Part Number 120602)

McDonnell & Miller FS8-WJ Flow Switch – 1" BSPT, SPDT Snap Switch, NEMA 4X Rated | 120602

The McDonnell & Miller FS8-WJ Flow Switch is a durable, high-performance liquid flow switch designed for general-purpose applications exposed to harsh environments. This NEMA 4X-rated unit features a 1" BSPT connection, SPDT snap switch, and sealed Monel bellows, making it ideal for demanding commercial or industrial systems.

This flow switch operates at up to 160 PSI and includes four stainless steel paddles (1", 2", 3", and 6") to accommodate a variety of pipe sizes. With its sensitivity adjusting screw, flow setpoints can be easily fine-tuned for accurate performance.

Key Features:

• 1" BSPT threaded connection (NPT also available)

• SPDT snap switch for reliable switching

• Sealed Monel bellows for enhanced durability

• Includes 4 interchangeable stainless steel paddles: 1", 2", 3", and 6" (25, 50, 80, 150 mm)

• NEMA 4X enclosure – water-tight and dust-tight

• Sensitivity adjustment screw for easy calibration

• Compatible with systems operating up to 160 PSI

• Temperature range: 32°F to 225°F (0°C to 107°C)

• Gold-plated contact option available

Applications:
Perfect for general-purpose liquid flow detection in:

• HVAC systems

• Water treatment plants

• Pump and piping systems

• Industrial fluid handling

Replacement For:
NEMA 4X-style flow switches from Potter/Taco, Watts, Penn, and other major manufacturers.

Model: FS8-WJ
Part Number: 120602
Max Pressure: 160 PSI
Max Temperature: 225°F (107°C)

⚠️ Note: Always verify compatibility with system specifications prior to installation.