PROline Promag 53 3 Installation
Endress+Hauser 25
3.2.8 Length of c onnecting 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 equalization between sensor and transmitter, if necessary.
• The permissible cable length Lmax depends on the fluid conductivity (Fig. 14).
A minimum conductivity of 20 µS/cm is required for measuring demineralized water.
Fig. 14: Permissible cable length for the remote version
Gray shaded area = permissible range
Lmax = length of connecting cable in [ft/m]
Medium conductivity in [
µS/cm]
Flow rate characteristic values - Promag H (US units)
Nominal diameter Recommended
flow rate
Factory settings
[inch] [mm]
min./max. full scale value
(v ~ 1.0 or 33 ft/s)
(v ~ 0.3 or 10 m/s)
Full scale value
(v ~ 8 ft/s)
(v ~ 2.5 m/s)
Pulse value
(~ 2 Pulse/s)
Low flow cutoff
(v ~ 0.1 ft/s)
(v ~ 0.04 m/s)
1/12" 2 0.015 to 0.5 gpm 0.1 gpm 0.001 gal 0.002 gpm
5/32" 4 0.07 to 2 gpm 0.5 gpm 0.005 gal 0.008 gpm
5/16" 8 0.25 to 8 gpm 2 gpm 0.02 gal 0.025 gpm
1/2" 15 1.0 to 27 gpm 6 gpm 0.05 gal 0.10 gpm
1" 25 2.5 to 80 gpm 18 gpm 0.20 gal 0.25 gpm
1-1/2" 40 7 to 190 gpm 50 gpm 0.50 gal 0.75 gpm
2" 50 10 to 300 gpm 75 gpm 0.50 gal 1.25 gpm
2-1/2" 65 16 to 500 gpm 130 gpm 1 gal 2.0 gpm
3" 80 24 to 800 gpm 200 gpm 2 gal 2.5 gpm
4" 100 40 to 1250 gpm 300 gpm 2 gal 4.0 gpm
F06-xxxxxxxx-05-xx-xx-xx-006
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