BUCHI Inert Loop B-295 - Manual (Page 49)

6 Operation
49 B-290 Operation Manual, Version I
6 .2 Conversion tables for the parameters
6 .2 .1 Flow meter spraying air (rotameter)
The rotameter is an indicator for the spray gas flow. The table gives a correlation between indicated
height and volume throughput. The nozzle has a certain pressure drop which increases with higher
gas flow. As the gas volume strongly corresponds to the actual pressure, the table also contains a row
for the effective volume flow, determined in a spray process with air.
Height (mm) Liters/hour Pressure drop (bar) Actual volume flow (at standard
temperature and pressure)
in liters/hour
5 84
10 138
15 192
20 246 0.15 283
25 301 0.18 355
30 357 0.23 439
35 414 0.3 538
40 473 0.41 667
45 536 0.55 831
50 601 0.75 1052
55 670 1.05 1374
60 742 1.35 1744
65 819 1.8 2293
6 .2 .2 Peristaltic pump
The peristaltic pump can be adjusted to dif-
ferent tubes according to the inner and outer
diameters. With different tube diameters, the
absolute flow is varying. The diagram shows
the correlation for the standard silicone tube
(2 mm ID, 4 mm OD) for water.
Fig. 6.3: Pump settings versus throughput