Industrial Flow Switches - From 2 to 15 Feet/second
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- Rugged Industrial Design
- Switch Point Adjustable While Unit Is Operating
- 15 A SPDT Switch Directly Controls Pump
- Mounts in Any Position
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The FSW-40A and FSW-50 Series flow switches feature 15 A SPDT switches and an internal screw adjustment for in-line monitoring of switch points. Multiple drag disks provide incremental switch point adjustment. Their non-magnetic design makes these switches ideal for applications in which rust is a problem. The FSW-40A Series has a brass and stainless steel construction (optional 316 SS), while the FSW-50 Series comes in a plastic/316 SS construction.
The FSW-40A Series is ideal for machine-cutting oils and for sewage applications in which large objects are not caught on the drag disks. Installation “T” fittings are recommended for installing switches for 2' pipe size and below. For other pipe sizes, a “tee” fitting or weld coupling can be used.
Model No. Extra Disks
Switch Point Adjustment Range (fps) Low High FSW-40A 1 1' 2.0 to 6.0 5.0 to 15.0 FSW-41A 2 1½ to 2½' 2.0 to 6.0 5.0 to 15.0 FSW-42A 3 3 to 10' 2.0 to 6.0 5.0 to 15.0 FSW-43A 3 10 to 48' 2.0 to 6.0 5.0 to 15.0 FSW-50 1 1' 3.3 to 5.3 7.4 to 11.5 FSW-51 1 1½ to 2½' 2.7 to 5.4 5.4 to 10.8 FSW-52 1 3 to 10' 2.0 to 4.0 4.0 to 8.0
Relay Switch: SPDT 15 A @ 125 or 250 Vac; 10,000,000 operations median
Nominal Sensitivity (% Flow Change to Activate Switch):
10% @ upper end of range
30% @ lower end of range
Pressure Drop: 1 to 3' pipe, less than 1 psi; 4' and above, negligible
FSW-40A Series: 1 NPT
FSW-50 Series: 1¼ NPT
FSW-40A Series: 300 psig @ 82°C (180°F)
FSW-50 Series: 100 psig @ 93°C (200°F)
Min Temperature: 4°C (40°F)
FSW-40 Series: Brass, 300 to 304 SS, phosphor bronze and EPDM and cork rubber (other materials are brass body, Noryl® cover, 300 SS and plastic hardware); also available with 316 SS, FKM, and PTFE
FSW-50 Series: Polyphenylene sulfide, 316 SS, FKM; also available with polyphenylene sulfide, Hastelloy C and FKM construction
Electrical Cable Fitting: Water resistant for cable diameters 0.250 ±0.025'
FSW-40A Series: 1.59 kg (3.5 lb)
FSW-50 Series: 113 g (4.0 oz)