Overview
The OMEGA FSW-42A-SS flow switch is a precision industrial control device designed for inline flow monitoring and switching. This unit belongs to the FSW-40A Series and combines brass, 316 stainless steel, phosphor bronze, and EPDM components to deliver corrosion resistance and durability in challenging liquid flow applications. With a non-magnetic design and internal screw adjustment for flexible switch-point calibration, the FSW-42A-SS is engineered for oil, water, and process fluid monitoring where reliability is critical.
Key Features
- SPDT Relay Switch: 15 A @ 125 or 250 Vac with 10,000,000 switching operations median life
- Non-Magnetic Design: Ideal for environments where rust and corrosion are concerns
- Stainless Steel Construction: 316 SS wetted parts offer superior corrosion resistance
- Adjustable Switch Point: Internal screw adjustment with multiple drag disks for incremental tuning
- Low Pressure Drop: <1 psi for 1–3″ pipe sizes
- Wide Flow Range: Sensitive to 2–15 feet/second, with 10% nominal sensitivity @ upper range and 30% @ lower range
Technical Specifications
| Switching Element | SPDT Relay, 15 A @ 125/250 Vac |
| Operating Life | 10,000,000 operations (median) |
| Pipe Size Range | 3″ to 10″ |
| Flow Range | 2 to 15 feet/second (FPS) |
| Nominal Sensitivity | 10% @ upper end, 30% @ lower end of range |
| Pressure Rating | 300 psig @ 82°C (180°F) |
| Minimum Temperature | 4°C (40°F) |
| Maximum Temperature | 82°C (180°F) |
| Pressure Drop | <1 psi (1–3″ pipe); negligible (4″ and above) |
| Process Connection | 1″ NPT Male |
| Wetted Materials | Brass, 316 SS, phosphor bronze, EPDM, cork rubber |
| Weight | 1.59 kg (3.5 lb) |
| Cable Fitting | Water-resistant (0.250 ± 0.025″ diameter) |
| Series | FSW-40A |
Typical Applications
- Machine-cutting oil circulation and temperature monitoring
- Sewage and wastewater flow detection where large particles are not caught
- Industrial cooling and circulation loop protection
- Pump discharge monitoring and flow proving
- Process fluid management in food, chemical, and manufacturing facilities
Compatibility & Replacements
Compatible With
- Standard industrial control relay circuits (125 Vac, 250 Vac)
- PLC inputs and hardwired control logic
- Inline pipe installations with NPT fittings (1″ NPT male)
- Machine-cutting oil and water-based process fluids
Replaces / Drop-In Replacement For
- OMEGA FSW-42A (non-stainless brass version)
- Equivalent 3″–10″ pipe flow switches with SPDT relay output
Works With
- AC power supplies (125 Vac, 250 Vac)
- Standard industrial relay modules and contactor logic
- Motor starters and solenoid valve controllers
- Temperature monitoring systems in circulation loops
