3
1
Application areas
The compact submersible mixers of the RW 200-280 series have been designed for a wide range of
applications. Apart from the use in pump sumps (for avoidance of deposits and floating crusts) the units are
also ideal for a variety of mixing and stirring applications in sewage treatment plants and in industrial areas.
The mixers can be installed independently of the tank shape or dimension. Depending on the intensity of mixing
required and the flow formation needed, one or more mixers may be installed.
ATTENTION
The maximum allowable temperature of the medium pumped is 40 °C.
1.1 Approvals
Electrical safety of the S-series is CSA and CSA(U) approved.
1.2
Explosion-proof approvals
The motors of the S-series have explosion-proof certification in accordance with Factory Mutual Class 1 Div. 1
Groups C and D (60 Hz, US), ATEX 2014/34/EC, Ex II 2G Ex h db IIB T4 Gb.
2 Safety
The general and specific health and safety guidelines are described in detail in the “Safety Instructions for
Sulzer Products Type ABS” booklet. If anything is not clear or you have any questions as to safety make certain
to contact the manufacturer Sulzer.
2.1
Particular comments on the use of explosion-proof mixers in explosive zones.
1. Explosion-proof submersible mixers may only be operated with the thermal sensing system connected.
2.
If ball type float switches are used, these must be connected to an intrinsically safe electrical circuit
“Protection type EX (i)” in accordance with VDE 0165.
3. Dismantling and repair of submersible explosion-proof motors may only be carried out by approved
personnel in specially approved work shops.
2.2
Special conditions for safe use of S-type, explosion-proof motors.
1. The integral supply cable shall be suitably protected from mechanical damage and terminated within an
appropriate termination facility.
2.
Motors rated for use with 50/60 Hz sinusoidal supplies shall have the thermal protection devices connected
in such a way that the machine is isolated from the supply in the event of the stator reaching 130 °C.
3.
These motor units are not intended for user service or repair, any operation that may affect the explosion
protection characteristics should be referred to the manufacturer. The maximum permitted flamepath gaps
are tighter than those specified in EN 60079-1:2014.
