Level measurement

120

Continuous level measurement in bulk solids

4. Instrument selection within the measuring principle

Installation instructions – radar

Installation • Not centered [3] • Not above filling curtain [4] • Distance to the wall [1]: ~ 1/6 of vessel diameter, at least however 20cm/7.9" Weather protection cover • Always recommended for installation outside (solar radiation and rain) [2] Connection for purge air or plating • Connection for purge air: FMR57, already integrated. In case of strong dust generation, clogging of the antenna is avoided. Not possible for FMR66B. Baffles in vessels • Make sure that baffles [1] like limit switches, struts, etc. are not within the beam cone (see also the beam angle table in this respect (next page)) • measurements Optimizing measures • Size of antenna: The larger the antenna the smaller the beam angle and the lower the interfering echoes • Interference echo suppression: Electronic suppression of interfering echoes optimizes the measurement • Inclined installed metallic plates [3] disperse the radar signals and reduce interfering echoes Alignment • Serves the avoidance of interfering reflection and improved measurement since the measurement can be aligned to the angle of repose • An alignment of the instrument is recommended FMR57 with optional alignment device FMR66B, FMR51 with optional alignment seal or assemble bracket FMR67B with optional alignment seal, device or alignment FMR67B with optional adapter or integrated • Horn plating: FMR57, FMR51, see accessories

2

3

4

1

Size of antenna FMR20

Beam

Size of antenna FMR66B Beam

Size of antenna FMR57 Beam

1

3

C

2

Size of antenna FMR67B Beam

Distance (D) 5m/ 16ft 10m/ 32ft 15m/ 49ft 20m/ 65ft 30m/ 98ft

40m/ 131ft 50m/ 164ft 60m/ 197ft 70m/ 230ft 80m/ 262ft 90m/ 295ft 100m/ 328ft 110m/ 361ft 120m/ 394ft 125m/ 410ft

Measurement in plastic vessels

• Metal lines/pipes • Conductors •Grids Ensure during installation that the beam cone of the radar instrument for bulk solids is free of any interfering sources.

Variable alignment with optional alignment seal

Assemble bracket