Device description
VKX / VKL
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© SIKA • Ea6300_VKX_VKL • 08/2020
1 Device description
SIKA flow switches are designed for minimum or maximum monitoring of liquid flows.
1.1 Intended use
The flow switches are exclusively designed for minimum or maximum monitoring of liquid
flows.
WARNING! No safety component!
The flow switches are no safety components in accordance with Directive 2006/42/EC
(Machine Directive).
Never use the flow switch as a safety component.
The operational safety of the supplied equipment is only guaranteed if it is operated accord-
ing to its intended use. The specified limit values (
§ 9 "Technical data") should never be
exceeded.
Before ordering and installation, check that the flow switches are suitable to your application.
1.1.1 Reed contact - Switching of inductive or capacitive loads
CAUTION! Destruction or damage of reed contact!
Take notice of the max. contact loads mentioned on the specification
plate!
The max. contact loads mentioned on the type plate (switching voltage, switching current and
switching capacity) refer to pure ohmic loads and may not be exceeded under any circum-
stances.
High voltage and current peaks can occur, particularly when switching inductive or capacitive
loads (e.g. relay coil, capacitors). Even if the overload is brief, this can destroy (welding the
contacts) or damage (reduced lifespan) the reed contact.
Only use protection methods which be appropriate and checked.
Protection method when electrical connection of reed contacts:
The following protective circuits are basically possible: current limiting resistors, RC cir-
cuits, freewheeling diodes, suppression diodes, varistors or a combination of these.
Please verify the effectiveness of the chosen protection method in accordance with the spe-
cific loads involved.
1.2 Exclusion of liability
We accept no liability for any damage or malfunctions resulting from incorrect installation, in-
appropriate use of the device or failure to follow the instructions in this operating manual.
