Endress+Hauser Promag 53 - Length of Connecting Cable

3 Installation Promag 53 PROFIBUS-DP/-PA
24 Endress+Hauser
3.2.9 Length of connecting cable
In order to ensure measuring accuracy, comply with the following instructions when
installing the remote version:
• Secure the cable run or route the cable in a 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 equalisation between sensor and transmitter, if necessary.
• Permissible cable length Lmax depends on the fluid conductivity (Fig. 15). A minimum
conductivity of 20
µS/cm is required for measuring demineralised water.
Fig. 15: Permissible cable length for the remote version
Gray shaded area = permissible area
Lmax = connecting cable length in [m]
Fluid conductivity in [
µS/cm]
200
100
5
10 100
L max
200
[m
]
[ S/cm]µ
L max
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