Wilo-EMU TR 212… – TR(E) 326…

Series description


Slow-running submersible mixer reduced by two-stage planetary gear


  • Energetically optimized mixing and circulation of activated sludges
  • Generation of flow rates in circulation channels
  • Further areas of application in industry

Type key

Example:Wilo-EMU TR 321.31-8/8
TRSubmersible mixer
3Number of blades
21x 100 = nominal propeller diameter in mm
31Propeller speed in rpm
8Number of poles
8x 10 = stator length in mm

Special features/product advantages

  • Efficient energy usage.
    The innovative blade geometry and energy-efficient IE3/IE4 motors ensure the best possible specific thrust coefficient. At the same time, this reduces your energy and operating costs.
  • Consistently reliable.
    The low-wearing GFK/PA6 propeller is durable and scores with its self-cleaning effect.
  • Smooth running thanks to the balanced propeller load, even in high thrust ranges and when incoming flow conditions are unfavourable.

Technical data


  • installation with stand allows free placement in basin
  • flexible installation
  • Two-stage planetary gear with exchangeable second planetary gear speed


  • Housing components: A 48 Class 35/40 B (EN-GJL-250)
  • Propeller blades: GRP
  • Propeller hub: A 536A 60-40
  • Screwed connections: AISI 316TI (1.4571)
  • Seal bushing: AISI 316TI (1.4571)
  • Gear shaft: Stainless steel AISI 329 (1.4462)



2- or 3-blade propeller with a nominal propeller diameter of 59 inch (1500 mm) to 102.5 inch (2600 mm). Entwining-free design made possible by backward-curved incoming flow edge .


Wilo-submersible motor of the T-series with standard connection for an easy and efficient adaptation of the motor output. The motor heat is given off directly to the fluid via the housing. The winding is equipped with a temperature monitor. Large-sized inclined and grooved ball bearings ensure long service life of the motor bearings.


Sealing is achieved through the use of a 3-chamber system (prechamber, gear chamber and sealing chamber). The large-volume prechamber and sealing chamber collect leakage from the mechanical seal. If desired, the prechamber can be equipped with an external sealing chamber electrode. The sealing between the fluid and the prechamber, as well as between the gear and sealing chamber are realized by a corrosion-resistant and wear-proof mechanical seal made of solid silicon carbide material. The sealing between the prechamber and gear chamber as well as between the sealing chamber and motor are realised by radial sealing rings. A seal bushing ensures long-term corrosion-protected fit of the mechanical seal.


2-stage planetary gear with exchangeable transmissions. The gear bearings are dimensioned so that the resulting mixing forces are absorbed and are not transferred to the motor bearings.


The power cable is a type NSSHÖU cable for heavy mechanical loads. The power cable enters the motor housing through a water pressure-tight cable lead-in with strain relief and bend protection. The individual wires as well as the cable sheath are additionally sealed to keep out fluids.


A separate configuration must be carried out for each application to ensure optimum generation of fluid current. Carefully follow the instructions for the supplied configuration when installing the units.


Operating mode S1 ‐ permanent operation:

The submersible mixer must be immersed when operated. Surfacing the propeller is strictly prohibited. In the case of fluctuating fluid levels, the system should switch off automatically if the degree of water submersion drops below the minimum level. The power cables must be installed in a way that these cannot be drawn into the propeller!


  • Special voltages
  • Thermistor temperature sensor
  • External sealing chamber control
  • Ceram C0 coating
  • Ex-rated to ATEX, FM or CSA


Scope of delivery

  • Submersible mixer with mounted propeller hub and cable
  • Cable length per customer request
  • 2 or 3 blades - delivered loose, installation on site
  • Accessories per customer request
  • Operating and maintenance manual




Gear chamber

Sealing chamber

directly driven


FC operation

Single-stage planetary gear


Two-stage planetary gear

Sealing by mechanical seal on motor side

Sealing by rotary shaft seal on motor side

Sealing by mechanical seal on fluid side

Seal for rotary shaft seal on fluid side


Explosion protection


Wet well installation, ground installation


Wet well installation, wall fixation


Lowering device for wet well installation


Tripod for wet well installation


Cast propeller


Steel propeller


PUR propeller


PUR/GRP propeller


GRP propeller


Motor temperature monitoring, bimetal

PTC motor temperature monitoring


Motor leakage monitoring

Sealing chamber monitoring


Propeller blades can be replaced individually


PDF: Wilo-EMU TR 212… – TR(E) 326…


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