Level controls propeller for powders or granulars

The level controls propeller indicators SEM are employed for level control in tanks that contain powders or granulars. The indicator’s working is very simple: a synchronous motor that rotates at low speed activates a propeller placed inside the tank to be controlled. In lack of material the motor is under voltage and the propeller revolves. The presence of material round the propeller bridles the rotation provoking control contacts exchange; another microswitch induces then the dump of the motor’s feeding voltage. Electric circuit opening and closing causes the command of an acoustic or visual signal, or the silo’s load, the conveyors and worm conveyors stop etc.
➤ Version: SEM 24VCC/S with inverter board uses a synchronous AC motor (brushless) driven by an electronic board, integrated in the housing, which converts the tension from DC to AC. The use of a brushless motor solves the typical problem of DC motors which have a limited lifetime due to the wear on the brushes.
General features:
• Aluminium casting case: hermetic protection for working in the open.
• Dust protection.
• The steel shaft is mounted on two ball bearings. 
• Aluminium propeller.
• 6 holes plate for assembly; with threaded boss 1”1/2 inch gas, supplied on request.
• The shaft with propeller is 15, 30, 50, 70, 100 cm long. 


1. Nr. 2 Pressacables PG9
2. Hub 1"1/2 gas
3. Shaft 
4. Propeller
5. Mounting plate  

The instrument is mounted on the external wall of the tank, on the side or on the top. The material should be free to move round the propeller, that should be not fouled by the material direct jet: so arrange baffles on the indicator when weight on propeller is high (high specific weight material or subject to move in block ones).


1. Adjustment screw of the spring strength


EMC 2014/30/EU
Absorbtion 3 VA
Atex version 2014/34/UE
Case aluminium
Electrical contacts 6A 250Vac - 3A 250Vdc
Low tension - LVD 2014/35/UE
Power supply 24 - 115 - 230Vca ±10% 50/60Hz - 24Vdc ±10%
Protection degree IP 65
Shaft length 15-30-50-70-100 cm
Working temperature -10° +60°C

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