User's Manual
Table Of Contents
- Table of contents
- Document information
- Function and system design
- Input
- Output
- Power supply
- Performance characteristics
- Installation
- Environment
- Process
- Custody transfer approval
- Mechanical construction
- Operability
- Certificates and approvals
- Ordering information
- Application packages
- Accessories
- Documentation
- Registered trademarks
Micropilot NMR84
Endress+Hauser 15
Installation
Installation conditions
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 25 mm (1 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)
xxx (xx.x)
1 1
≤5 (0.2)
A
B
≤5 (0.2)
A0023596
8 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
D1 (= antenna size) D2 L
150 mm (6 in) 200 mm (8 in) 300 mm (12 in)
200 mm (8 in) 250 mm (10 in) 300 mm (12 in)
250 mm (10 in) 300 mm (12 in) 450 mm (18 in)