Safety Instructions: Zone 0 - Endress+Hauser Cubemass Serie Consignes De Sécurité

Cubemass
Safety instructions: 
Zone 0
Endress+Hauser
• The following applies when connecting the electronics housing in Ex e:
Only separately certified cable and pipe entries, drain plugs (Ex e II) must be used, which are suitable for an
operating temperature of up to 80 °C and for an ingress protection of IP 67. The cables must be installed
such that they are fixed in place. Adequate strain relief must be ensured.
• Suitable cables and suitable, certified cable glands, cable entries and drain plugs must be used for measuring
devices operated at temperatures below –20 °C.
• The cable entries and openings not used must be sealed tight with suitable components.
• If Category "ia" intrinsically safe circuits of the measuring device are connected to certified intrinsically safe
Category "ib" circuits with explosion group IIC or IIB ratings, the type of protection changes to Ex ib IIC or
Ex ib IIB, as applicable. Intrinsically safe "ib" circuits are suitable for areas which require Category 2
equipment.
• If the active intrinsically safe communication circuits (input/output option: S, T; terminals 26/27 or 24/25)
are fed into areas that require 1D or 2D apparatus, the connected apparatus must be tested and certified
accordingly.
• In Zone 0, potentially explosive vapor/air mixtures may only occur under atmospheric conditions. If no
potentially explosive mixtures are present, or if additional protective measures have been taken according to
EN 1127-1, the devices may be operated under other atmospheric conditions in accordance with the
manufacturer's specifications.
Potential equalization
The transmitter is to be securely connected to the potential equalization system using the screw terminal on the
outside of the transmitter housing. Alternatively, the transmitter of the compact version can be integrated into
the potential equalization via the pipeline as long as the pipeline provides a ground connection conforming to
regulations.
!
Note!
Further information about potential equalization, shielding and grounding can be found in the associated
Operating Instructions.
Potential equalization with shield grounded at both sides for Modbus version
3
+5 V
R
R
R
GND
Fig. 2: Example for connecting potential equalization lines
1 Distributor/T-Box
2 Bus devices for potentially explosive atmospheres
3 Bus terminator Modbus RS485
4 Bus supply unit or automation system
4a Potential equalization line is fed out into the safe area
!
Note!
The length of the spur must be observed.
If Category II1G devices are necessary when installing the measuring device, make sure that sources of ignition
resulting from impact or friction between the housing and an iron or steel object cannot be created, even for
operational faults or malfunctions that seldom occur.
1 1
2
XA000146D
E X
E X
2
4a
4
A0007469
17