27
5 Electrical connection
5
Electrical connection
NOTE!
If you determine an external defect – also a mechanical way – the differential pressure transmitter has
to be sent for repair to the manufacturer.
5.1
Installation notes
DANGER!
When making the electrical connection, the relevant regulations must be observed:
- Regulations concerning electrical apparatus in hazardous areas (Elex V)
- Regulations on the installation of electrical apparatus in hazardous areas
- EC-type-examination certificate
The electrical connection must only be carried out by qualified personnel!
The supply must be intrinsically safe and must not exceed the following maximum values:
U
i
: DC 28 V
I
i
: 120 mA
P
i
: 0.8 W
1
effective internal inductance L: 28 µH
effective internal capacitance C: 28 nF
minimum internal resistance R
i min
: 19 Ω
In the version with attached cable, the following values have to be added according to the cable
length L:
effective internal inductance L
cable
: 2 µH/m × L
effective internal capacitance C
cable
: 0.2 nF/m × L
minimum internal resistance R
cable
: 0 Ω/m × L
Only intrinsically safe, certified measuring devices may be used in intrinsically safe circuits!
If the pressure transmitter is mounted on containers or pipelines in which a potentially explosive at-
mosphere is present continuously or for long periods, the supply cable of the pressure transmitter
must have a fixed installation!
L
i
/R
i
ratio:
1
see "Permissible temperatures gas", Page 32, and "Permissble temperatures dust", Page 32
Cable length (m)
Li (µH)
Ci (nF)
Li/Ri (µH/Ω)
0
28
28
1.47
2
32
28.4
1.68
5
38
29
2.00
10
48
30
2.53
20
68
32
3.58
50
128
38
6.74
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