WIKA N-11 - Manual (Page 5)

2147614.07 GB/D/F/E 04/2009
8 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio N-10, N-11
2147614.07 GB/D/F/E 04/2009
9 WIKA Operating instructions/Betriebsanleitung/Mode d'emploi/Instrucciones de servicio N-10, N-11
7. Starting, operation GB
Remove the protection cap by hand only just before installation and absolutely avoid
any damage to the diaphragm during installation as well (N-11).
For Model N-10 you have to provide for a sealing element; exceptions are instruments
with self-sealing threads (e.g. NPT thread).
For Model N-11 the sealing ring is included in delivery.
Please refer to our data sheet “Pressure gauge sealing washers AC 09.08” in WIKA’s
product catalog Pressure and Temperature Measurement or our website
www.wika.de for details about sealing washers.
When mounting the instrument, ensure that the sealing faces of the instrument and
the measuring point are clean and undamaged.
Screw in or unscrew the instrument only via the flats using a suitable tool and the
prescribed torque. The appropriate torque depends on the dimension of the pressure
connection and on the sealing element used (form/material). Do not use the case as
working surface for screwing in or unscrewing the instrument.
When screwing the transmitter in, ensure that the threads are not jammed.
For tapped holes and welding sockets please see Technical Information IN 00.14 for
download at www.wika.de -Service
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7. Starting, operation GB
Electrical connection
Do not disconnect the electrical connection while under voltage!
Use a supply voltage with power limitation P
≤ W.
Ensure that the power supply is limited to U < 42 VDC even in the case of
malfunction.
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Switch on the operating voltage only after establishing the electrical connec-
tion in order to avoid any spark formation.
Ground the cable screen at one end, preferably in the safe, thus non-
Ex, area (EN 60079-14). For transmitters with flying leads, the screen is
connected to the housing. The simultaneous connection of housing and
cable screen to ground is only permitted if ground loop problems between
the screen connection (e.g. at the power supply) and housing can be
excluded (see EN 60079-14). 
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Supply the pressure transmitter from a galvanically isolating power supply
unit.
Consider both the internal capacitance and inductance.
Cover flying leads with fine wires by an end splice (cable preparation).
Consider that cables for use in zones 0 and must be checked with a test voltage
between conductor/earth, conductor/screen, screen/earth of more than 500V (AC).
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An additional interlock,
to prevent the M12x1
connector from being
opened unintentionally, is
required. Use the attached
clip (WIKA part number
2073164). Put both parts
of the sleeve over the
connector shroud and
press them together to
secure it. Attach the flag to
the cable by inserting the
“arrow” into the hole.
For Transmitters with connector M1x1 and installation/use in Zone :
!
Warning
Warning
Warning
Warning