Flow Switch Installation; General Installation Instructions - SIKA VH Série Notice D'utilisation

Flow switch installation

4 Flow switch installation
CAUTION! Material damage!
When soldering the copper pipe fitting ( § 4.2) or the threaded nipple ( § 4.3) , the
flow switch (body with paddle mechanism) and the O-ring must be dismounted. Over-
heating during soldering will damage these components and impair their operation.
 Remove the flow switch and the O-ring before you start soldering.

4.1 General installation instructions

 When choosing the installation site, ensure that the specified limit values (( § 9
"Technical data") are not exceeded.
 Select suitable measures to prevent the medium from freezing.
If the flow switch is to be used in ambient temperatures of <4°C, do not carry out any op-
eration beforehand with pure water, e.g. a test run. Residual water in the flow switch can
result in frost damage.
 Firstly, clean the pipe system in which the flow switch is to be installed and remove any
magnetic particles, e.g. welding residue.
 The straight in- and outlet pipe (in front of and behind the flow switch) has to be at least 5
x DN.
 The nominal installation position of the flow switch is an "upright standing position" in
horizontal pipework.
 The switches should only be installed in a vertical position,
deviation max. 45° ( Fig. 1).
 Please contact the manufacturer if other installation positions
are desired.
 Please make sure that there are no external magnetic fields
in the immediate vicinity of the flow switch, since these can
impair device functioning ( Fig. 2a).
 There is an arrow on the flow switch. Ensure that this arrow
is parallel with the pipe shaft and is facing in the direction of
flow during installation ( Fig. 2a).
 The brass and stainless steel union nuts ¾"BSP (version
VH...) have a tightening torque of 25...30 Nm.
 When tightening the union nuts, hold the pipe section against
the surface provided ( Fig. 2b).
 The plastic union nuts (version VK...) have a tightening torque
of 7...8 Nm.
Additional information for flow switch version VH...X
 Please observe the specified limit values when choosing the installation site ( § 9
"Technical data").
- 28 - © SIKA • Ea3000_FlowSwitch • 02/2014
VH... / VK...
Fig. 1
Fig. 2a
Fig. 2b