Description
The FSW301 flow switch comprises a
paddle system with a permanent
magnet attached. Above that
magnet is a reed contact, located
outside the flow of fluid. A second
magnet with opposing poles creates
the force necessary to reset the switch
back to the no flow position.
When the monitored flow pushes the
paddle and changes the position of
the magnet in relation to the reed
contact it activates the contact.
As soon as the flow is interrupted,
the paddle moves back to its starting
position, which returns the reed
contact to the initial position. The force
necessary to push the magnet back is
provided by the two magnets repelling
each other. Using magnetic force
instead of the usual leaf spring means
the switch is considerably more stable
in the long term and much less
sensitive to pressure peaks.
The reed contact used as a sensing
element consists of two ferro-magnetic
contact blades located in a glass bulb
filled with inert gas. This practically
eliminates wear resulting from contact
burning. This construction allows a
useful life of up to 100,000,000
switching cycles.
Specifications and Dimensions
Maximum Pressure: 25 bar
Maximum Process Temperature: 110°C
Maximum Ambient Temperature: 80°C
Protection Class: IP65
Process Connection: ½" BSPP Male
Maximum Switching Current: 1 A
Maximum Switching Voltage: 230 Vac, 48 Vdc
Maximum Switching Capacity: 26 VA, 20 W
Set Point Tolerance: ±15%
Plug Connector: DIN 43650 socket.
Materials of Construction:
Body: Brass
Paddle System: Polypropylene, Noryl
Shaft: Stainless steel |
 |
Pipe Size
mm |
Paddle Trim |
Setpoints (Horiz. Pipe. Water 20°C)† |
Max.
Flow Rate
lpm (m³/h) |
Paddle
Mark |
Insertion
Length (L3) mm |
Increasing Flow
lpm (m³/h) |
Decreasing Flow
lpm (m³/h) |
|---|
| 20* |
9 |
40 |
18.3 (1.1) |
15 (0.9) |
66 (4) |
| 25* |
15 |
46 |
21.7 (1.3) |
18.3 (1.1) |
83 (5) |
| 32* |
20 |
51 |
31.7 (1.9) |
26.7 (1.6) |
133 (8) |
| 40* |
30 |
61 |
35 (2.1) |
30 (1.8) |
166 (10) |
| 50* |
40 |
71 |
45 (2.7) |
40 (2.4) |
233 (14) |
| 80* |
60 |
91 |
85 (5.1) |
78.3 (4.7) |
500 (30) |
| 100** |
80 |
111 |
106.7 (6.4) |
96.7 (5.8) |
666 (40) |
| 150** |
80 |
111 |
258.3 (15.5) |
236.7 (14.2) |
1666 (100) |
| 200** |
80 |
111 |
500 (30) |
483.3 (29) |
3000 (180) |
* Requires Installation into 'T' Fitting to EN 10242
** Requires Installation into ½" BSPP Socket, Length 15mm to EN 10241
†Insertion into vertical pipes possible, set points on request |
|
† All amounts shown in EUR, GBP, or USD
Note: Comes with operator's manual.
Ordering Example: (1) FSW301-G Insertion style flow switch, £150.22
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