Endress+Hauser Proservo NMS83 Operating Instructions Manual page 19

Proservo NMS83
Endress+Hauser
5.1.3 Mounting with a stilling well
The stilling well diameter that is required to protect the measuring wire without disturbing
its operation varies depending on the tank height. The stilling well could either be of
constant diameter, or narrower at its upper part and wider at its lower part. The following
figure shows two examples of the latter case, namely a concentric stilling well and an
asymmetric stilling well.
A
D
1
d
r
D
2
 6 Mounting with concentric stilling well
A Front view
B Side view
L Length from the center of the calibration window to the upper part of the stilling well
1
L Length from the center of the calibration window to the bottom of the stilling well
2
L Length from the center of the calibration window to the bottom of the flange
3
D Diameter of upper part of stilling well
1
D Diameter of stilling well
2
d Diameter of displacer
p Longitudinal wire position from the center of the flange
(Lx)
r Radial direction offset
B
D
1
d
p(L ) x
D
2
Installation
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