Endress+Hauser Smartec CLD18, Руководство по эксплуатации

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Smartec CLD18 Commissioning
Hauser 29
8.4.1 Installation factor
In confined installation conditions, the conductivity measurement in the liquid is affected by
the pipe walls. This effect is offset by the installation factor. The cell constant is corrected by
multiplying by the installation factor.
The value of the installation factor depends on the diameter and the conductivity of the pipe
nozzle as well as the sensor's distance to the wall.
The installation factor f (f = 1.00) can be disregarded if the distance to the wall is sufficient
(a>20 mm (0.79 in), from DN60).
If the distance to the wall is small, the installation factor increases for electrically insulating
pipes (f > 1), and decreases for electrically conductive pipes (f < 1).
It can be measured using calibration solutions, or a close approximation determined from the
following diagram.
1
2
a [inch]
0
10
20 30 40
a [mm]
0.95
1 00 .
1.05
f
0.39 0.79
1.18 1.57
A0020517
 14 Relationship between the installation factor (f) and the distance from wall (a)
1 Electrically conductive pipe wall
2 Electrically insulating pipe wall