KROHNE BM 26 A EN User Manual
Page 36
36
Installation and Operating Instructions BM 26 A
4.3
Heating system for measuring tube BM 26 A/B
For extreme operating conditions, the measuring tube is fitted with a heating jacket with 2 standard
Ermeto 12 connections, for heat transfer fluid or steam heating. See section 7.1 for more technical
data.
The maximum allowable operating pressure, Pmax, of the heating medium depends on the length of
the measuring chamber.
Measuring chamber length, L
Pmax*
m ft
bar
psig
0 < L ≤ 2
0 < L ≤ 6.5
10
145
2 < L ≤ 4
6.5 < L ≤ 13
7
101.5
4 < L ≤ 6
13 < L ≤ 19.5
5
72.5
* The heating steam or cooling fluid must have a temperature in the range of -200°C to +400°C /
-330°F to 750°F. Insulation of the measuring tube is recommended.
If operating conditions outside the ranges above are necessary, please contact KROHNE.
1. Heating medium inlet
2. Heating
system
3. Measuring
tube
4.4
Liquid/liquid interface measurement BM 26 A/TS
If a tank contains two liquids with different densities, the level of the interface can be measured
by means of an adapted float loaded with ballast. The floats buoyancy properties permit it to float on
the surface of the heavier liquid and ignore the lighter liquid. The difference in liquid densities must
be at least 100 g/l or 6.24 lb/ft
3
, with the float being fully submerged in the lighter liquid.