Installation Proline Promag 53 MODBUS RS485
20 Endress+Hauser
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 (→ å 16).
• The maximum connecting cable length is 10 m (32.8 ft) when empty pipe detection
(EPD → ä 91) is switched on.
a0010734
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
200
100
5
10 100 200
L
max
[m][m]
[µS/cm]
L
max
[ft]
200 6000
400
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