1
0454EN July 2015
Boiler room components
Flow switch K500
ISO
14001
0032A/3
OHSAS
18001
0064L/1
ISO
9001
0006/7
Description
The ow switch K500 is used to control the ow in the pipes of the heating
and/or conditioning system.
The ow switch is equipped with four blades for use in pipes from 1" (DN25)
to 8” (DN200). The device is designed in such a way as to ensure hermetic
separation of the mechanical part from the electric part.
Versions and product codes
Product code Size No. of blades included
K500Y002 1” ÷ 8” (DN25 ÷ DN200)
1 blade of 35 mm
1 blade of 58 mm
1 blade of 89 mm
1 blade of 167 mm
Technical data
• Operating temperature range: -20÷110 °C
• Maximum ambient temperature: 50 °C
• Max. working pressure: 10 bar
• Fixing with G 1”threaded tting
• Blades for pipes from 1”to 8”(from DN25 to DN200)
• Protection degree: IP65
• Measured ow rate: see the table in the paragraph“installation”
Materials
• Casing: shockproof thermoplastic material
• Body: brass
• Blades: stainless steel AISI 301
Electrical data
• SPDT dust-tight microswitch with approvals UL, cUL, CSA, ENEC.
• Rated insulation voltage: 380 V~
• Rated use voltage: 220÷250 V~
• Rated current for continuous service: 10 A
• Resistive load: 16 A
• Inductive load: 6 A
• Continuous current: 0,2 A
• Increasing ow rate:
Open contact C - NC
Close contact C - NO
Operation
When inserted in the pipe, the blade movement is proportional to the ow
that strikes it; the movement is mechanically transmitted to a microswitch
that activates or deactivates an electric contact.
The sensitivity of the ow switch can be adjusted via the setting screw.
A particular feature of the device is its low load loss.
Setting
The ow switch is calibrated at the factory for intervention at
the minimum ow rate. Turn the adjustment screw clockwise
to increase the ow rate value at which the intervention occurs.
Warning.
If you need to turn the screw anti-clockwise to decrease the ow rate,
check that the spring is not too unloaded, as this will aect the reset
of the device.
Installation
The ow switch is installed on horizontal pipe sections, away from sources of
disturbance or turbulence, such as valves, elbows, etc ... (minimum distance
from said devices is equal to 5 times the diameter of the pipe).
For correct operation, respect the maximum distance between the bottom of
the appliance and the surface of the pipe (~ 48 mm) (Fig.1).
Once the flow switch has been installed, check the correct operation by
pressing on the flow adjustment screw to simulate the flow (Figure 2).
Fig.1 Fig.2
Max. 48 mm
Flow adjustment
screw
Warning.
The 35 mm blade could interfere with the internal diameter of some
1" ttings. If this occurs simply cut the blade to reduce the length.
The table indicates the ow rate values at which the intervention and recovery
occur, the diameters of the corresponding pipes and the blade to use.
If necessary shape the prole of the blades.
Ø piping Blade length
[mm]
MIN Flow rate
[m3/h] with ow in:
MAX ow rate
[m3/h] with ow in:
reduction increase reduction increase
1” (DN25)
35
0,5 1 1,9 2
1 1/4” (DN32) 0,7 1,2 2,7 2,9
1 1/2” (DN40)
58
1 1,6 3,6 3,9
2” (DN50) 2,1 2,9 5,7 6,1
2 1/2” (DN65)
89
2,7 4 6,5 7
3” (DN80) 4,3 6,1 10,7 11,4
4” (DN100)
11,3 14,7 27,6 28,9
167 * 6,1 7,9 17,3 18,4
5” (DN125)
89 22,8 28,3 53 55,5
167 * 9,2 12,8 25 26,7
6” (DN150)
89 35,8 43 81,6 85
167 * 12,2 16,8 30,5 32,5
8” (DN200)
89 72,4 85 165,5 172,3
167 * 38,5 46,4 90,7 94
* These values are obtained by adding the longer blade
K500
