Micropilot NMR84
Installation
Hauser
13
5
Installation
5.1
Installation conditions
5.1.1
Conditions for the stilling well
• Metal (no enamel coating)
• Constant diameter (no rectangular stilling wells)
• Weld seam as smooth as possible
• For best radar propagation behavior it is recommended to have holes instead of slots. If
slots can not be avoided, they should be as thin and short as possible.
• Maximum gap between antenna/horn and wall of the stilling well: 5 mm (0.2 in).
• At any transition (e.g. when using a ball valve or mending pipe segments) gaps must not
exceed 1 mm (0.04 in).
• The stilling well must be smooth on the inside. Average roughness ≤ 6.3 µm (0.248 µin)
• Length and number of the holes do not affect the measurement. The hole diameter
(deburred) can be 1/7 of the well diameter, but should not exceed 30 mm (1.2 in).
• An increase of the pipe diameter is possible if the minimum lengths according to the
following figure and table are taken into account:
øD1
øD1
øD2
øD2
L
L
500 (19.7)
500 (19.7)
1
1
≤5 (0.2)
A
B
≤5 (0.2)
A0023596
3
Installation of NMR84 in stilling wells with a larger diameter
A
Antenna ≤150 mm (6 in) (without horn extension)
B
Antenna ≥ 200 mm (8 in) (with horn extension)
1
Extension from ØD1 to ØD2
Содержание Micropilot NMR84
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