Rotary blade level indicator for vertical mounting with shaft extension with protecting tube and measuring blade 69.

The rotary blade level indicator F9 observes the filling level as a limit switch. It can be used as indicator for dusty and powdery, granulated and grainy bulk goods and are appropriated due to the range of models and blades to control the level of bulk solids like dust, flour, grain, sand, plastic, etc. with a bulk density between 0.01 to 2 t/m3. Although the characteristics of the product, humidity, conductivity, grain size, etc. change, any adjustment is needed

These devices are used to control the level in silos, containers, bunkers and they can be installed horizontally or vertically. For vertical mountings there are rope shafts up to 10 m could be made depending on the product to control.

The rotating measuring blade, projecting into the silo or container, is driven by a gearmotor. If the bulk material reaches the measuring blade, the rotation will be hindered and it will be stopped. The return torque turns the pivoted motor from its end position and actuates the signal switch. A second switch turns off the motor off.

If the filling level of the bulk material sinks, the blade becomes freely again and a spring will turn the motor back into its original end position. Thereby the motor will be turned on again and the signal switch will be switched back.

There are models that can be mounted horizontally or vertically into the silo.

The standard form is mounting the device with a flange, drilling holes on the silo to allow the mounting of the controller using screws, rods, fasteners or nuts. If the flange was not requested, the thread is G 1 " 1/4 l and can be fixed using 1 or 2 nuts or introducing it into a threaded socket with a maximum of 25 mm length. If it is larger, the bulk goods have the possibility to deposit in the thread socket. This could provoke that the device becomes useless.

After the mounting is done, the housing could be turned in order to face the cable gland correctly.


Approximate measures given in mm.

Technical data

NameRotary blade indicator
TypeF9-69 – ref: 9107-...
Measuring blade speed1 rpm
Switching voltageStandard 230 V AC (50 – 60 Hz)
(Under request 115 V AC, 48 V AC, 24 V AC, 24 V DC due to a converter)
Power consumption4 VA in AC; 4 W in DC
Density of the product0,01 t/m3 – 2 t/m3
Maximum pressure-0,5 bar – +1 bar
(Under request up to +5 bar with sealing ring of Stainless Steel-PTFE-Viton)
Cable entry2 of M20x1,5
Maximum voltage of contact4 V DC – 250 V AC
Contact function1 NO + 1 NC
Capacity of the contact 1 mA / 4 V DC – 2 A / 250 V AC (for resistive loads)
For inductive or capacitive loads reduce at 50%
Bulk goods temperature-20° C – +80° C
(Under request up to +150º C)
Ambient temperature-20° C – +70° C
Protection IP66 according to DIN EN60529
Weight1,2 Kg – 5 Kg depending on the model
HousingAluminium, RAL 7001 coated
Thread connectionG 1 " 1/4 Aluminium
Flange connectionAluminium
(Under request Stainless Steel)
Measuring bladeS.S. 1.4301, shaft S.S 1.4305
(Under request special models of S.S. 1.4401)
Sealing ringNBR
(Under request Stainless Steel-PTFE-Viton)
Rod shaftStainless Steel
Protection tube shaftZincated Steel
(Under request Stainless Steel)

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