Proline Promag 53 PROFIBUS DP/PA
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 matching between sensor and transmitter, if necessary.
• The permissible cable length L
max
depends on the fluid conductivity (Fig. 17). A minimum
conductivity of 20 µS/cm is required for measuring demineralized water.
a0004293
Fig. 17:
Permissible cable lengths for the remote version
Gray shaded area = permissible range
L
max
= Length of connecting cable in [m]
Fluid conductivity in [µS/cm]
Flow rate characteristic values - Promag H (US units)
Nominal
diameter
Recommended flow rate
Factory settings
[mm]
[inch]
Min./max. full scale value
(v
≈
0.3 or 10 m/s)
Full scale value
(v
≈
2.5 m/s)
Pulse value
(
≈
2 pulse/s)
Low flow cut off
(v
≈
0.04 m/s)
1
/
12
"
2
0.015 to 0.5 gal/min
0.1 gal/min
0.001 gal
0.002 gal/min
5
/
32
"
4
0.07 to 2 gal/min
0.5 gal/min
0.005 gal
0.008 gal/min
5
/
16
"
8
0.25 to 8 gal/min
2 gal/min
0.02 gal
0.025 gal/min
½"
15
1.0 to 27 gal/min
6 gal/min
0.05 gal
0.10 gal/min
1"
25
2.5 to 80 gal/min
18 gal/min
0.20 gal
0.25 gal/min
1 ½"
40
7 to 190 gal/min
50 gal/min
0.50 gal
0.75 gal/min
2"
50
10 to 300 gal/min
75 gal/min
0.50 gal
1.25 gal/min
2 ½"
65
16 to 500 gal/min
130 gal/min
1 gal
2.0 gal/min
3"
80
24 to 800 gal/min
200 gal/min
2 gal
2.5 gal/min
4"
100
40 to 1250 gal/min
300 gal/min
2 gal
4.0 gal/min
200
100
5
10
100
200
[m]
[ S/cm]
m
L
max
L
max