KROHNE BM 70 M - Manual (Page 45)

BM 70 M 45
8.6.5 Stilling well
Fct. 3.1.6 STILLWELL
If the device is operated with a stilling well, the option Stilling well = YES and the inside diameter
of the pipe should be entered here in mm.
•
NO: operation without stilling well
• YES: operation with stilling well
If YES has been selected, proceed with ↵ and enter the inside diameter:
• Setting range: 25 ... 200 mm
• Default value: 100 mm
If the diameter of the stilling well is greater than 200 mm, enter the maximum value = 200 mm.
8.6.6 Reference and tank bottom offsets
Fct 3.1.7 REF. OFFSET
An arbitrary reference offset is added to the measured distance (positive when the reference point
is above the flange; negative when the reference point is below the flange): see Example 1 below.
The offset is effective for all distance values (local display, current output, switching output, digital
information).
• Setting range: -10 m ... +10 m (32.8 ft)
•
Default value: 0
Fct 3.1.8 TB.OFFSET
An arbitrary tank bottom offset is added to the measured level (positive, when the reference point
is below the set tank height; negative, when the reference point is above the tank bottom): see
Examples 2 and 3. The offset acts on all level values (local display, current output, switching
output, conversion table, digital information).
• Setting range: -99.99 m ... +99.99 m (328 ft)
•
Default value: 0
Examples of setting the reference offset and tank bottom offset:
Example 1:
Reference point for distance measurement
(ullage) differs from flange position (in the
example, 1 m above the flange).
Let the tank height be H = 6 m.
H = 6m
BM 70 Reference point
Reference plane
for distance measuring
RO = 1m
"Ullage"
7m
Block-
distance