Installation And Maintenance; Electrical Connection - JUMO MIDAS S21 Ex Betriebsanleitung

6

Installation and maintenance

6 Installation and maintenance
6.1

Electrical connection

DANGER!
The relevant regulations must be observed during electrical connection:
- Regulation for electrical plants in potentially explosive rooms (Elex V)
- Regulation for the installation of electrical plants in potentially explosive areas
- EC-type examination certificate
 The electrical connection must only be carried out by qualified personnel!
The voltage supply must be intrinsically safe and must not exceed the following maximum values:
U : DC 28 V
i
I : 100 mA
i
P : 750 mW
i
Effective inner inductivity L: negligibly small
Effective inner capacity C: ≤ 10.4 nF
In intrinsically safe electrical circuits, only intrinsically safe, certified measuring devices may be used!
For electrical connection 11 (attached cable) the following values results in dependence of the cable
length L:
U ≤ 28 V
i
I ≤ 100 mA
i
P ≤ 750 mW
i
C ≤ 10.4 nF + 100
i
L ≤ 1
i
General information
• Maximum cable length 50 m
• Minimum bending radius 120 mm (for permanent laying)
• Protect the cable end against humidity
• Observe the length-dependent inductivities and capacities if lengthening the cable
• Lay the signal lines isolated from cables with a voltage of > 60 V
• Use protected cables with twisted cores
• Keep away from large, electrical plants
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 "ib".
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.
16
pF
× L
m
µH
× L
m