KROHNE BM 102 EN - Manual (Page 26)

26 BM 102
4 Technical data
4.1 Technical data
Application
Range of applications Continuous level measurement of liquids, solids and powders
Function and system design
Measuring principle
Time domain reflectometry using a direct mode of measurement
Equipment architecture See section 4.2
Input
Measured variable Distance (between the reference point – gauge flange facing –
and the product surface), level, liquid interface & volume
Measurement range Variable according to probe type, see Equipment architecture,
section 4.2.1 Minimum tank height = 0.15 m or 0.5 ft.
Blocking Distance
(dead zone) Variable according to probe type, see probe measurement limits,
section 4.2.2
Output
Analogue 4 … 20 mA, passive output
Load
Passive outputs 750 Ω maximum
Error signal 22 mA
Resolution ± 3 µA
Digital HART
®
, passive output
Digital, Ex ia HART
®
, passive intrinsically-safe output
Signal on alarm Status markers via PC STAR 2 or HART
®
controller (HHC)
Performance characteristics
Reference operating conditions
Ambient temperature
+20°C ± 5°C or +68°F ± 9°F
Ambient air pressure 1013 mbar abs. ± 20 mbar or 14.69 psig ± 0.29 psi
Relative air humidity 60% ± 15%
Reference target - coaxial probe : water surface
- single probe : Ø 0.8 m or Ø 31.5 in. metal plate
- twin probe : metal block “short circuit”
Free space diameter > 300 mm or > 11.81” *
Distance to obstruction > 1 m or > 3.3 ft.
Accuracy
Level measurement Liquids when probe length, L ≤ 15 m or 50 ft.
± 15 mm or 0.6” outside the dead zone
Optional: ± 5 mm or 0.2”
Liquids when probe length, L > 15 m or 50 ft.
± 15 mm or 0.6” ± 0.1% of the measured distance
Optional: ± 0.05% of the measured distance
Solids (powders)
± 20 mm or 0.8”
with 4 … 20 mA current output
± 0.01% of the measured distance
* not for coaxial probe.