A Quick Overview For You; Signs, Symbols And Abbreviations; Function; For Your Safety - WIKA WU-20 Manual De Instrucciones

2. A quick overview for you / 3. Signs and symbols
Knowledge required: Install and start the transducer only if you are familiar with the relevant
regulations and directives of your country and if you have the qualification required. You have
to be acquainted with the rules and regulations on hazardous areas (if transducer with Ex-
marking), measurement and control technology and electric circuits, since this transducer is
„electrical equipment" as defined by EN 60079-14. Depending on the operating conditions of
your application you have to have the corresponding knowledge, e.g. of aggressive media.

2. A quick overview for you

If you want to get a quick overview, read Chapters 3, 5, 7 and 11. There you will get some
short safety instructions and important information on your product and its starting. Read
these chapters in any case.

3. Signs, symbols and abbreviations

Potential danger of life or of
!
severe injuries.
Warning
For transducer with Ex-
marking: Instructions for
hazardous areas: Potential
Warning
danger of life or of severe
injuries.
Notice, important informa-
tion, malfunction.
4 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio WU-2X
GB
Potential danger of life or
of severe injuries due to
catapulting parts.
Warning
Potential danger of burns
due to hot surfaces.
Caution
The product complies with
the applicable European
directives.
ATEX
The product complies with
the requirements of the
European directive 94/9/EC
on explosion protection.
V DC Direct voltage
4. Function and accessories / 5. For your safety
2-wire Two connection lines are intended for the voltage supply.
The supply current is the measurement signal.
3-wire Two connection lines are intended for the voltage supply.
One connection line is intended for the measurement signal.
U+ Positive supply connection
U- Negative supply connection
S+ Positive measurement connection

4. Function

Ultra High Purity Transducer
WU-20: Single End
WU-25: Flow Through
WU-26: Modular Surface Mount
Function: The pressure prevailing within the application is transformed into a standardised
electrical signal through the deflection of the diaphragm, which acts on the sensor element
with the power supply fed to the transducer. This electric signal changes in proportion to the
pressure and can be evaluated correspondingly

5. For your safety

Select the appropriate transducer with regard to scale range, performance
„
!
and specific measurement conditions prior to installing and starting the
instrument.
Warning
Consider the relevant national regulations (e.g.: EN/IEC 60079-14) and
„
observe the applicable standards and directives for special applications (e.g.
with dangerous media such as acetylene, flammable gases or liquids and
toxic gases or liquids and with compressors). Non-observance can result
in serious injury and/or damage to equipment.
Open pressure connections only after the system is without pressure!
„
„ Please make sure that the transducer is only used within the overload threshold limit all the
time!
„ Observe the ambient and working conditions outlined in section 7 „Technical data".
WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio WU-2X
GB
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