KROHNE BM 100A EN User Manual
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Installation and operating instructions BM 100 A
Traction forces during emptying cycles for powder applications
Traction load is dependent upon the height and shape of the tank, product particle size & density,
and the rate at which the tank is emptied. The table below gives the load at which cable probes will
break.
Cable maximum design loads (traction)
Probe
Maximum Load
Type K : Single cable Ø8 mm / Ø 0.3”
3.5 T / 7700 lb
Type B : Twin cable Ø6 mm / Ø 0.2”
3.6 T / 7900 lb (1.8 T per cable)
Traction on cable according to product (approximate value in metric tons & pounds)
Probe Length
Material Probe
used
10 m / 32.8 ft.
20 m / 65.6 ft.
30 m / 98.4 ft.
Cement
Single cable Ш8 / Ш 0.3” 1.0 T / 2200 lbs
2.0 T / 4410 lbs
3.0 T / 6620 lbs
Flyash
Single cable Ш8 / Ш 0.3” 0.5 T / 1100 lbs
1.0 T / 2200 lbs
1.5 T / 3300 lbs
Wheat
Single cable Ш8 / Ш 0.3” 0.3 T / 660 lbs
0.6 T / 1320 lbs
1.2 T / 2650 lbs
PE granules Twin cable Ш6 / Ш 0.2”
0.2 T / 440 lbs
0.6 T / 1320 lbs
1.0 T / 2200 lbs
Electro static discharge (E.S.D.)
BM100 Standard and Ex gauge electronics are normally shielded up to 16KV against E.S.D.*.
*For non-Ex powder applications, BM100A probes are protected up to 32 kV.
Note:
E.S.D. cannot be solved by BM100A E.S.D. protection. It is the customer’s responsibility
to avoid E.S.D. by connecting the tank, product and probe installation to ground.
1
Danger of injury
The probe may become electro
statically-charged during
operation; earth the probe by
pushing it against tank wall with a
suitably isolated tool just before
touching it to avoid receiving a
shock.
2
Earth the entry pipe and product.
Product deposits on the nozzle and probe
Product build-up can occur under the nozzle: this may weaken the pulse. Avoid cavities that permit
the build-up of deposits.
Tank roof deformation
Tank roofs should support loads of at least 3.5 tonnes / 7700lb for gauge installations using type K
single cable probes and 3.6 tonnes / 7900 lb for gauge installations using type B twin cable probes
without deformation.