Datasheet
FLOW SWITCHES
51
FLOW
SWITCHES
www.gems-sensors.co.uk
PISTON TYPE
FS-100E 2.0 - 15.0 l/min with pre-adjusted set points
FS-100E-A 1.0 - 16.0 l/min with adjustable set points
G 3/8"
50
0
69
max. ø 6.5
20.9
SW 27
G3/8"
54
1
2
Pin number of
plug connector
Housing: Brass
Piston: Brass
O-Ring: Buna N
Spring: Stainless Steel
Magnet Ferrite
Adjust the housing to setting required
78
SW 27
54
G3/8"
69
max. Ø 6.5
102
50
G3/8"
The FS-100E version (with pre-adjusted set points 2.0. . .6.0 l/min) operates in vertical
mounting position only. It is equipped with a calibrated piston which is displaced by liquid
flow to magnetically actuate a hermetically sealed reed switch isolated within the unit body.
When flow decreases the piston returns to its prior position by its own, weight and
deactuates the reed switch. The FS-100E version (with pre-adjusted set points 5.0. . .15.0
l/min) operates with the same principle but a positive spring-return deactuates the switch
when flow decreases. Mounting is possible in any position.
The FS-100E-A (adjustment range 1.0 . . . 16.0 l/min) operates according to the same
principle as the FS-100E with spring. The FS-100E-A is provided with an additional scale
on the brass body on which set points as well as setting functions can be adjusted in one
operation. Only the mark of the junction box has to be moved over the respective scale
value. Pressure drop is not influenced at all when changing set points.
FS-100E FS-100E-A
Max. flow 24 . . . 40 l/min. 55 l/min
Max. operating pressure 50 bar 50 bar
Max. pressure drop 0.3 bar 0.3 bar
Max. operating temperature +90 °C +90 °C
Set points see order number adjustable 1 ... 16 l/min
Switching function NO/NC; the required function may be adjusted by moving
(related to increasing flow) the junction box
Mounting position see order number any position
Factory calibration position vertical, inlet port down vertical, inlet port down
Repeatability ±1% ±1%
Adjustment accuracy ±10% ±10%
Hysteresis max. 5% max. 20%
Mountings G 3/8" G 3/8"
Electrical connections miniature plug connector with cable gland
(max. cable ø: 6.5 mm)
Enclosure IP 65 IP65
Electrical data contact rating 40 VA, 2 A, 220 V~ 40 VA, 2 A, 220 V~
Weight appr. 0.5 kg appr. 0.5 kg
Specifications (all data related to water at +20°C)
How to Order
Pressure Drop Diagram
set points Mounting order
(l/min) position number
FS-100E 2.0 vertical 020-0402
3.0 vertical 020-0403
4.0 vertical 020-0404
5.0 vertical 020-0405
6.0 vertical 020-0406
5.0 any position 020-0505
6.0 any position 020-0506
7.0 any position 020-0507
8.0 any position 020-0508
9.0 any position 020-0509
10.0 any position 020-0510
11.0 any position 020-0511
12.0 any position 020-0512
13.0 any position 020-0513
14.0 any position 020-0514
15.0 any position 020-0515
FS-100E-A any position
020-0315
Dimensions (in mm)
Wiring diagram
Set point adjustment/
Contact configuration
Standard Products in bold
0 10 20 30 40 50
FLOW RATE (l/min)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0