FLOW 33 Ex

Induction flow meter without a display unit

I M1 Ex ia I Ma

II 1G Ex ia IIC T6 Ga

II 1D Ex ia IIIC T85°C Da

Thanks to its unique stainless steel construction, it is ideal for using where long service life is required even under heavy duty conditions. The meter is in compact construction.

The advantage is the possibility of using the meter in diverse technologies where the customer needs pulse or current signals from the meter for process management without having to use the display unit and the meter is installed in explosion hazard area at the same time. Its applications are found in various industrial branches, such petrochemical, chemical, etc.

The flow meter is equipped with two informative LEDs that indicate the status of the meter. Electrical connection is ensured by means of ATEX connectors according to individual zones. The flow meter cannot be readjusted and its outputs are fixed. Therefore, please take due care when specifying electrical outputs.  The flow meter has impulse output, 5–15 Hz output, and 4–20 mA or 0.2–1 mA current loops.


  • ATEX certificate for explosive atmospheres
  • full stainless construction
  • very rigid construction
  • extensive variability of mechanical connection
  • wide choice of materials for liners and electrodes
  • status signalling with LEDs
  • maintenance-free operation


Indukční průtokoměr FLOW 33 v přírubovém provedení čidla


Indukční průtokoměr FLOW 33Ex v sendvičovém provedení čidla


Indukční průtokoměr FLOW 33 v závitovém provedení čidla


Indukční průtokoměr FLOW 33 v potravinářském provedení čidla


Power 24V DC±15% (Pi 1.904 W)
Electrical connection I M1 Ex ia I Ma  –  Amphenol C016 (7 Pin)
II 1G Ex ia IIC T6 Ga  –  SEALCON Signal Connector M23
II 1D Ex ia IIIC T85°C Da  –  SEALCON Signal Connector M23
Design compact
Diameter nominal DN 15÷200
Lining material rubber (hard, soft, for potable water), PTFE, ceramics
Electrode material CrNi steel DIN 1.4571, Hastelloy C4, Titan, Tantal
Construction all-welded frame
Sensor material flanged – stainless steel and structural steel with polyurethane coating
sandwich, threaded, food processing – stainless steel
Process connection sandwich
flanged DIN (EN1092)
threaded (EN ISO 228-1)
food processing (fittings DIN 11851, clamp)
Pressure PN10, PN16, PN25, PN40
Min. medium conductivity 20 μS (at a lower conductivity, upon agreement with manufacturer)
Measure range (Qmin/Qmax) unidirectional for 0,2÷12 m/s (1/60)
Flow meter accuracy accuracy up to 0,5 %, repeatability up to 0,2 %
Pressure loss negligible
Display 2x LED (meter status distinguished by 4 colours)
Settings entirely by manufacturer
Outputs (passive) pulse or frquency 5÷15 Hz
current loop 4÷20 mA or 0,2÷1 mA
Flow sensor protection IP65
Ambient humidity max. 90%


The state of the meter is continuously indicated by two LED indicators located in the cover plate of the evaluation unit (next to M12 connector).

LED 1 LED 2 Description Current output


The meter is in order and the flow is zero or negative (for single-direction measurement) 4 mA


flickering blue

The meter is in order and the flow is positive whereas the blue LED indicates the transmission of volumetric pulses 4÷20 mA



Empty measuring tube < 4 mA


Meter is out of order, servicing needed < 4 mA



Meter is temporarily out of parameters < 4 mA

Meter is temporarily out of parameters
Vizualizace LED signalizace produktu FLOW33 Ex