WIKA IUT-11 - Manual (Page 5)

Universal IS Pressure Transmitter UniTrans
Special Intrinsic Safety Instructions
Subject to change due to technical modifications. © Copyright WIKA Alexander Wiegand GmbH & Co. KG / Germany
WIKA Alexander Wiegand GmbH & Co. KG · Alexander-Wiegand-Str. · 63911 Klingenberg · (09372) 132 - 710 · Fax - 706 · E-mail: [email protected] ·
www.wika.de
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2 Special Intrinsic Safety Instructions
2.1 Protection of diaphragm
2.2 Special wiring advice
2.3 Connection to Zone 0
2.4 Special precaution for connection to Zone 0 and or Zone 20
As soon as the diaphragm of an instrument gets damaged, absolutely no intrinsic
safety can be guaranteed any longer! Thus the diaphragm must not come in con-
tact with abrasive substances! The diaphragm must be protected against pressure
peaks and must not be touched by tools! Information about material consistency
against corrosion and diffusion can be found in our WIKA Handbook, 'Pressure and
Temperature Measurement' (German: ISBN 3-9804074-0-3, English: ISBN 3-
9804074-1-1).
The housing must always be connected to earth to protect the instrument against
electromagnetic fields and electrostatic charges.
The cables and wires must not be damaged.
Cables for applications in Zone 1 and 2 or Zone 21 and 22 must be checked with
a test voltage between conductor/earth, conductor/screen, screen/earth of more
than 500 V (AC).
Flying leads with fine wires must be covered by an end splice (cable preparation).
Both the internal capacity and inductivity must be considered.
Conductive screens may only be connected to earth one-sided and outside the
hazardous area.
(In general Zone 0 is given when the instrument is surrounded by a mixture of
explosive gases more than 1.000 hours per year = continuous hazard. The trans-
mitter may only be operated under Zone 0 conditions, as long as an atmospherical
pressure of 0.8 to 1.1 bar is guaranteed).
The circuits must be of type Ex ia.
The ingress protection must comply to IP 67 according to IEC 529.
Make absolutely sure to follow the advice given in the IEC publication 60 529 for
connection to Zone 0 and/or Zone 20 for IP 67 pressure connections!
Installation in non-metallic vessels:
All metallic parts reaching into Zone 0 and/or Zone 20 must be grounded.
The intrinsically safe circuit must be decoupled from the regular circuit.
If the mounting position is less than 1m away from the transition into Zone 0 and/or
Zone 20 an overvoltage protection must be integrated. This can either be done
within the transmitter (option: overvoltage protection), or outside the transmitter by
the customer himself.
Warning
Warning
Warning
Warning Warning