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6 Installation
6.4 Electrical connection in Ex areas
General information
The relevant regulations must be observed during electrical connection; furthermore, in the potentially
explosive area the minimum requirements according to Directive 1999/92/EC apply, for example:
• Regulation for the project planning, selection and installation of electrical plants in potentially explo-
sive areas (IEC/EN 60079-14)
• EU type examination certificate
NOTE!
Only certified measuring devices may be used in intrinsically safe electrical circuits,!
NOTE!
The intrinsically safe electrical circuit must be restricted to overvoltage category I, as stipulated in
IEC 60664-1. The electrical circuit supply is only to be provided by a certified, intrinsically safe power
source with a protection level of "ia".
NOTE!
In particular, equipment used in potentially explosive areas where hybrid mixtures are present must be
checked. Hybrid mixtures are explosive mixtures of flammable gases, vapors, or mists with flammable
dusts. The operator is responsible for checking that the equipment is suitable for such uses.
DANGER!
Only the HART® modem may be used in the explosion-proof area!
The JUMO interface must not be used!
The device's voltage supply must be intrinsically safe and must not exceed the following maximum
values:
U
i
: DC 28 V
I
i
: 115 mA
P
i
: 750 mW
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