The GEMU 3021 intelligent flow transmitter can be used for measuring liquid inert and corrosive aqueous media. The keypad at the front of the unit enables simple setting of measurement units, required display values etc.

  • High-resolution turbine flow measurement
  • Medium wetted parts in plastic, sapphire and ceramics
  • Totalizer type (flow counter)
    • Frequency/Current output signals
    • Reset input for resetting the accumulated flow rate
  • Batch controller type (dosing function)
    • 2x relay outputs
    • 1x binary output for batch end
    • 2x binary inputs for selecting batches
    • 1x binary input as start signal
  • Extremely low pressure loss
  • Easy operation via keypad
  • Process adaptable
  • Short inlet and outlet distances
  • Freely scalable measurement range
  • Integrated flow rectifier


Note Please click "Magnifying Glass" next to the attributes listed below to view helpful information.
Type 3021
Nominal Size DN 25 DN 50
Body Configuration 2/2-way body
Connection Union ends with DIN insert (socket) Union ends with inch insert (socket) Unions ends with DIN insert (IR butt welding)
Material Body PVC-U, grey, inner parts PVDF Body PVDF, inner parts PVDF
Seal Material EPDM FPM
Display Position
Display parallel, 0° to flow direction Display parallel, 180° to flow direction Display vertical, 270° to flow direction Display vertical, 90° to flow direction
Function Batch controller, 2 relays, remote control inputs and time control Totalizer, 0/4-20 mA and pulse output
Voltage 24 V DC
Protection Class to EN 60529 IP 65
Weight DN 25: 600 gDN 50: 1500 g
Mounting Position Optional
Mounting Note Inlet/outlet distances 5 x DN
Note Measuring certificate with calibration data is included.
Calibration with water 20°C.

To prevent blockage of the rotor due to particles contained in the medium, an upstream dirt filter (mesh width 100 µm) should be installed!

Working Medium

Working Medium Liquid inert or corrosive aqueous media which have no negative impact on the physical and chemical properties of the body and seal material.


Directives CE
EMC 89/336/EEC

Operating Conditions

Storage Temperature -10 to +60 ºC
Operating Temperature -20 to +60 ºC
Medium Temperature with Body Material PVC-U (Code 1): +10 to +60 ºCPVDF (Code 20): -20 to +80 ºC
Type of Medium liquid ≤ 120 mm2/s (120cSt)


Medium Wetted Parts Material Bearing/Shaft: Sapphire/Ceramics (AI203) Body: PVC-U/PVDF Inner turbine components: PVDF Seals: FPM, EPDM
Flow Transducer Material Housing bolt: 1.4303 Housing Cover of Measuring Device, Size B: PMMA Housing seal: NBR Housing: PP
Plug Material Plug Bolt: PA 66 (Batch controller) Plug Housing: PA 6 (Totalizer) VQSt 36-2-4.8 Profile packing: NBR