KROHNE BM 102 Handbook - Manual (Page 69)

BM 102 69
5.2.2 Definition of terms
Distance
Distance from the face of flange to the level (1 product) or the surface of
the top product (2 products).
Level: Height from the bottom of the of the tank to the surface of the top product
(Tank height – distance).
Probe Length: Ordered length of probe, L1, from face of flange to end of probe (including
short circuit and counterweight).
Tank Height: Distance from the face of the flange to the bottom of the tank.
Ullage (volume): Unfilled volume.
Volume: Total volume filled.