Level measurement

64 Continuous level measurement in liquids

4. Instrument selection within the measuring principle

Installation instructions radar – free space

Weather protection cover • Always recommended for outside installation to avoid strong temperature changes of electronics Installation • Not in the center • Not above the fillstream • Distance to wall: ~1/6 of the tank diameter, at least, however, 30cm/12" (6GHz) or 15cm/6" (26GHz/80GHz) If these conditions cannot be met: Use stilling well • Lateral installation on request Nozzle • FMR51/54 horn antenna should protrude from the nozzle. Please note the max. nozzle length, otherwise use antenna extension • FMR50/52 note the max. nozzle length • FMR5x note the max. nozzle length, depending on nozzle diameter and antenna • The inactive part of the rod antenna should be longer than the height of the nozzle. Please contact our application consultant if this is not possible • Please note the information in the Technical Documentations Measuring range • Measurement is possible up to the tip of the antenna, on principle, however, the end of the measuring range should not be closer than 50mm/2" to the tip of the antenna because of corrosion and build-up formation • The measuring range starts where the radar beam meets the tank bottom. With dish bottoms or conical outlets, the level cannot be detected below this point Tank installations • Avoid any installations like limit switches, temperature sensors, etc. within the signal beam (see table below) • etc. may impair measurement Optimization options • Size of antenna: The larger the antenna diameter the smaller the beam angle (see table below, the less interference echoes) • A stilling well or a Levelflex can always be used to avoid interference Foam of formation • Radar pulses may be absorbed by foam • The surface of foam can reflect. Solution: Trial measurement with Levelflex or hydrostatic measurement

C

50 51 52

Version FMR

50 51

51 52

50 51

10

20

54

Antenna

DN40 DN40* DN80 DN150 DN200 DN250 DN40 DN50 DN80 DN100

Beam angle

30°

12°

12°

23°

19°

15°

23°

18°

10°

8°

Max. nozzle length without extension [mm/"]**

140/ 6

365/ 14

880/ 35

205/ 8.1

290/ 11.5

380/ 15

500/20

** depending on nozzle diameter, as well as mounting inside or outside the nozzle