Proservo NMS81
Endress+Hauser 31
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.
L
1
L
2
L
1
L
2
A
B
L
3
L
3
D
2
D
1
d
r
D
1
d
D
2
p (L )x
A0029573
12 Mounting with concentric stilling well
A Front view
B Side view
L
1
Length from the center of the calibration window to the upper part of the stilling well
L
2
Length from the center of the calibration window to the bottom of the stilling well
L
3
Length from the center of the calibration window to the bottom of the flange
D
1
Diameter of upper part of stilling well
D
2
Diameter of stilling well
d Diameter of displacer
p
(Lx)
Longitudinal wire position from the center of the flange
r Radial direction offset
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