Proline Promag 55 FOUNDATION Fieldbus
Installation
Hauser
21
3.2.9
Length of connecting cable
In order to ensure measuring accuracy, please comply with the following instructions when
installing the remote version:
• Secure the cable run or route the cable in an armored conduit. Movement of the cable can falsify
the measuring signal, particularly if the fluid conductivity is low.
• Route the cable well clear of electrical machines and switching elements.
• Ensure potential equalization between sensor and transmitter, if necessary.
• The permissible cable length L
max
depends on the fluid conductivity (
16,
17).
Promag S
a0006116
Fig. 16:
Permitted lengths for connecting cable in remote version, as a function of the conductivity of the fluid
Gray shaded area = permissible range
L
max
= length of connecting cable
Promag H
A0010734
Fig. 17:
Permitted lengths for connecting cable in remote version, as a function of the conductivity of the fluid
Gray shaded area = permissible range
L
max
= length of connecting cable
[µS/cm]
50
40
30
20
10
5
0
10
0
20
30
40
50
[m]
L
max
L
max
50
100
150
0
[ft]
200
100
5
10
100
200
L
max
[m]
[m]
[µS/cm]
L
max
[ft]
200
600
0
400
