Overview
The Omega Engineering FSW-42A-SS is a drag-disk flow switch designed for industrial liquid flow monitoring in 3″ to 10″ pipe systems. Operating at flow rates between 2 ft/s and 15 ft/s, this unit combines robust construction with precision control. The FSW-40A Series features brass and stainless steel construction with optional 316 SS, making the -SS variant ideal for applications where corrosion resistance is critical.
Key Features
- Features a 15 A SPDT switch and internal screw adjustment for in-line monitoring of switch points
- Multiple drag disks provide incremental switch point adjustment
- Non-magnetic design makes these switches ideal for applications in which rust is a problem
- Ideal for machine-cutting oils and for sewage applications in which large objects are not caught on the drag disks
- 316 stainless steel construction for superior corrosion resistance in harsh environments
- Relay Switch rated SPDT 15 A @ 125 or 250 Vac with 10,000,000 operations median
Technical Specifications
- Nominal Sensitivity: 10% @ upper end of range, 30% @ lower end of range
- Pressure Drop: 1 to 3′ pipe, less than 1 psi; 4′ and above, negligible
- Max Pressure/Temperature: FSW-40A Series: 300 psig @ 82 °C (180 °F)
- Min Temperature: 4 °C (40 °F)
- Installation Fitting: 1 NPT
- Weight: FSW-40A Series: 1.59 kg (3.5 lb)
Typical Applications
- Machine-cutting oil systems requiring flow verification
- Sewage and wastewater treatment monitoring
- Closed-loop cooling systems in industrial machinery
- Corrosive liquid handling in chemical processing
- Hydraulic and lubricant flow detection
- General industrial liquid flow alarming and control
Compatibility & Replacements
Compatible With
- 3″ to 10″ nominal pipe systems
- Industrial control circuits rated for 125 or 250 Vac
- PLC and relay-based automation systems accepting SPDT switch inputs
- Flow monitoring and safety interlocks in liquid handling systems
Replaces / Drop-In Replacement For
- FSW-42A (standard brass/stainless steel model) — upgrade to 316 SS for improved corrosion resistance
- Other FSW-40A Series variants designed for smaller pipe diameters
Works With
- Standard 1″ NPT process connections
- Industrial electrical systems and control panels
- Relay logic and PLC discrete input modules accepting dry contact closures
- Temperature and pressure rating: 300 psig @ 82 °C (180 °F) maximum
