FLOW
SWITCHES
PISTON TYPE
FS-550E 15.0 - 125.0 (l/min) with pre-adjusted set points
Standard FS-550E switches sense liquid flow in either direction to monitor flow/noflow conditions. The paddle is trimmed during installation to permit switch actuation at
the desired flow rate. As flow increases in a pipe, the paddle of the switch pivots to
move out of the liquid path, producing less than 200mb of pressure drop regardless of
pipe size.
Specifications
(all data related to water at +20°C)
Max. flow
Max. operating pressure
Proof pressure
Max. pressure drop
Temperature range
determined by the pipe’s inside diameter
55 bar
82 bar
0.2 bar
cable: -20 °C...+80 °C
terminal box: -20 °C...+150 °C
see set point adjustment guideline
Set points
Switching function
(related to increasing flow)
Mounting orientation
Repeatability
Dimensions (in mm)
58 x 64
34
22
FLOW SWITCHES
36
Enclosure
Electrical data contact rating
Weight
88
±25%
max. 50%
R1"
- cable: PVC,3 x 0.34 mm2 (length: approx. 1 m)
- terminal box
- IP 65
- SPDT max.
20 VA, 0.5 A, 250 V~
0.6 kg
6
Adjustment accuracy
Hysteresis
Mounting
Electrical connections
17
-SPDT
vertical, electrical connection up
±5%
PG11
PG7
Electrical
Connection
Brass
Stainless Steel
Cable
Terminal box
020-3493
020-3497
020-3495
020-3499
Set Point Adjustment
135
How to Order
(approximate)
Pipeline sizes
1 1/2"
2"
2 1/2"
26
3"
decr.
incr.
decr.
42
106
84
80
57
144
103
80
114
76
53
Mounting Method
decr.
incr.
57
incr.
decr.
1 1/2"
2"
2 1/2"
3"
incr.
Set points (l/min) with increasing
and decreasing flow
182
152
118
144
99
76
Housing:
Paddle:
Spring:
Magnet:
Brass or Stainless Steel
Stainless
Stainless
PTFE
www.gems-sensors.co.uk
Cut-off size
Wiring Diagram
24mm max from
inside of pipe to
underside of
hexagon
white
brown
green
Standard Products in bold
63