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Different membranes should be used depending on the special characteristics of the bulk materials used. The weaker and less abrasion-resistant membranes are naturally somewhat more sensitive. They are particularly appropriate
- for bulk materials with particularly low specific weight,
- or in small containers.
The correct choice of the installation point is also very important.
Theavailable membranes are:
| Material |
use for |
Perbunan 0,5 mm (PB 05) or
Perbunan 1,0 mm (PB 10) |
powdered materials with low specific weight: grime, chalk, PVC granulates, food (milk powder, flour, cocoa), semolina, rolled oats, rice, sugar, cacao beans, leguminous plants, salt, coffee, grain and bulk materials of similar structure |
Viton 0,5 mm (VT 05) or
Viton 1,0 mm (VT 10) |
powdered bulk materials at higher temperatures. Moreover for: Cement, gypsum, fertilizer, dry sand, gravel and filling materials with stronger abrasion. |
Membrane characteristics:
| Type of membrane |
for indicator type |
Device Sensitivity |
Abrasion resistance |
Food |
Temp. range in °C |
fat constancy |
| PB 05 |
FMK 508 |
very high |
average |
yes |
-30 to +100 |
good |
| PB 10 |
FMN 113 |
very high |
average |
yes |
-30 to +100 |
good |
| VT 05 |
FMK 508 |
high |
very high |
no |
-30 to +150 |
very good |
| VT 10 |
FMN 113 |
high |
very high |
no |
-30 to +150 |
very good |
Always choose the larger level indicator type
- for bulk materials with greater grain size and stronger internal friction,
- if the bulk materials tend to form crusts or bridges.
Attention!
These level indicators are only conditionally suitable
- for materials that strongly form crusts,
- for materials with high internal friction (e.g. coke of larger granulation)
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