Endress+Hauser Proline Promag 51, Operating Instructions Manual

Page: 27 / 124

Proline Promag 51 3 Installation
Hauser 27
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.
• The permissible cable length Lmax depends on the fluid conductivity (Fig. 17).
A minimum conductivity of 20
µ
S/cm is required for measuring demineralized water.
F06-xxxxxxxx-05-xx-xx-xx-006
Fig. 17: Permissible cable length for the remote version
Gray shaded area = permissible range
Lmax = length of connecting cable in [m]
Fluid conductivity in [
µ
S/cm]
200
100
5
10 100 200
[m]
[ S/cm]
µ
L
max
L
max