Omega Products FSW-40A User Manual

INDUSTRIAL FLOW SWITCHES

From 2 to 15 ft/s

FSW-40A/

FSW-50 Series

U Rugged

Industrial Design

U Switch Point

Adjustable While
Unit is Operating

U 15 A SPDT

Switch Directly
Controls Pump

U Mounts in

Any Position

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,
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.

SPECIFICATIONS

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
Maximum Pressure/Temperature:
FSW-40A Series: 300 psig @

82°C (180°F)

FSW-50 Series: 100 psig @

93°C (200°F)

Minimum Temperature: 4°C (40°F)

106

(4.2)

52

(2.0)

100

62

(2.4)

Extra
drag discs
included

Dimensions: mm (inch)
FSW-40A/41A: 38 (1.5)
FSW-42A: 89 (3.5)
FSW-43A: 140 (5.5)

Wetted Parts:
FSW-40 Series: Red brass, 316 SS,

phosphor bronze and EPDM and cork
rubber (other materials are brass
body, Noryl

FSW-50 Series: Polyphenylene
sulfide, 316 SS, FKM; also available
with polyphenylene sulfide,
Hastelloy C and FKM construction

®

cover, 316 SS hardware)

(3.9) deep

1 NPT

FSW-42A
shown
smaller than
actual size.

11⁄4 NPT

Dimensions:
mm (inch)

Extra drag
disks included

Electrical Cable Fitting:

Water resistant for cable diameters

0.250 ±0.025"

Weight:
FSW-40A Series: 1.59 kg (3.5 lb)
FSW-50 Series: 179 g (6 oz)

FSW-50: 29 (1.2)
FSW-51: 46 (1.8)
FSW-52: 84 (3.3)

FSW-50 shown smaller
than actual size.

To Order Visit omega.com/fsw40_50 for Pricing and Details

No. of Extra
Model No. Disks Included For Pipe Sizes Low High

FSW-40A 1 1" 2.0 to 6.0 5.0 to 15.0
FSW-41A 2 1¹⁄₂ to 2¹⁄₂" 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 1¹⁄₂ to 2¹⁄₂" 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

Comes complete with operator’s manual.
For FSW-40A series with 316 SS, FKM and PTFE special construction, add suffix “-SS” to

model number, for additional cost. For FSW-50 series with polyphenylene sulfide Hastelloy C
and FKM special construction, add suffix “-HST” to model number, for additional cost.

Ordering Examples: FSW-40A-SS, FSW-40A flow switch with special 316 SS, FKM
and PTFE construction.

FSW-52, flow switch for 3 to 10" pipe.

Switch Point

Adjustment Range (fps)

79

(3.1)

46

(1.8)

B-79