Fixed Connecting Cable; Adjusting The Switching Unit; Type Of Contact; Flow Switch Version Vh - SIKA VH Série Notice D'utilisation

VH... / VK...

5.4 Fixed connecting cable

 Connect the connecting cable according to the connection diagram ( Fig. 15,  Fig. 16):
Flow switch version VH3.../VK3...
Fig. 15a
* To prevent electrostatic charging the VH3...X devices have to be connected to the equipotential
bonding via the fixed connecting cable.
6

Adjusting the switching unit

6.1 Type of contact

Standard contact:
The switching unit of the control switch enables two types of contact:
1. Normally open contact:
2. Normally closed contact:
The following table explains the two types of contact:
Type of contact
Normally open contact
Normally closed con-
tact
If not otherwise agreed with the customer, the switching unit is factory set as a normally
open contact.
Change-over contact (only for VH3...):
For flow switches with a change-over contact a fine adjustment can only be carried out within
the red arrow. The contact switches after reaching the set switching point.
6.2 Flow switch version VH...X
The flow switch version VH...X is supplied ex works with normally open contact and a fixed
switching point. Adjustment of the type of contact and the switching point for flow switch ver-
sion VH...X is not permitted.
Technical changes reserved
Standard contact:
Flow switch version VH3...X
Fig. 15b
"RED" arrow on the switching unit
"WHITE" or "BLUE" arrow on the switching unit
Setting
increasing
RED arrow
decreasing
increasing
WHITE or
BLUE arrow
decreasing
Adjusting the switching unit
Change-over contact :
only flow switch version VH3...
Flow rate
closing
opening
opening
closing
Fig. 16
Electric contact
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