KROHNE BM 102 EN - Manual (Page 11)

BM 102 11
For clean applications only :
Coaxial (type 3) probes may be used close to or touching objects or walls as the EM field generated
by the probe is contained within the probe’s outer sheath (refer also to the EM field sizes/free area
given in the figures on the next page).
1 Agitator
2 Support beam perpendicular to the
pulse direction
3 Abrupt changes in tank cross section
4 Heating tubes
5 Alternative solution: reference chamber
-electromagnetic field is contained
within chamber
6 Gauge electromagnetic field:
Any intruding metallic object will be
detected in this zone if perpendicular to
the emitted pulse direction.
= Do not fit the gauge near to these objects.
Recommended minimum distance of probe from objects inside the tank
Probe Type
Minimum free space
Single (types 1,2 and 6) 300 mm or 12”
Twin (type 4) 100 mm or 4”
Coaxial (type 3) 0 mm or 0”
Electromagnetic field shape around probe, by type (not to scale)
Single (types 1,2 and 6)
Twin (type 4) Coaxial (type 3)
No beam angle for any probe type.