SMALL-Ex® Öl-Durchfluss “ViscoFlow”

SMALL-Ex® Measuring Instruments are intrinsically safe volume flow measuring instruments for pure oil. In the volume flow measuring instrument is an arrangement of gears, whose revolutions are counted by an impulse sensor. They can be equipped with integrated pressure and/or temperature measuring sensors.

The volume flow will transmit as analogous signal with a signal range of 5-15 Hz, 0/4-20 mA, *-** V (max. 10 V DC; at a power supply of min. 7.5 V DC) or CAN-Bus. Moreover, possible is a “pulse output”, up to max. 1kHz, at which the volume can be counted because a defined amount of oil flows through the device per pulse.
The volume flow measuring instrument for oil can be used as an instantaneous display of liters per minute or impulse output as “counting”.

The oil is passed through gear-wheels so, per count, a defined amount of oil flows. Thus, the instrument is independent of viscosities or temperatures. This value will be transmitted via an arbitrary signal and also optionally displayed in the illuminated display on site.
This measuring instrument can be used e.g. in hydraulic systems up to 400 bar for measurement of pump performance or (the impulse version) for displacement measurement of hydraulic cylinders.


I Ex ia I Ma
Ex ia I Ma
PO Ex ia I Ma X


BVS 06 ATEX E005 X
IECEx BVS 09.0056X
IECEx TSA 13.0023X
MSHA 18-ISA 150004-0
TC RU C-DE.AA87.B.00727/21

Env. Tempemperature

-50 to +100 °C for Group I
-50 to +80 °C for Group II

Housing material

Stainless steel, cast iron (depending on type)

Gauge accuracy

+/- 0,5% from end-value (higher accuracy on request)


pure oil, fuel

Illuminated Display



l/min; l/sec; gpm (other units on reauest)

Output signal

5 – 15Hz
0/4 – 20mA
* – **V (max. 10 V DC, at min. 7,5V power supply)
pulse output up to 1 kHz

Nominal voltage

12V DC (7,5 – 14,0 V DC) 3-wiring technology
16V DC (9,6 – 16,1 V DC) 3-wiring technology
24V DC (14 – 26,6 V DC) 2-wiring technology


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Did you know?

This is what one of our displays for our MAGIN-EX® measurement device series looks like.

We also offer control displays for all our other measurement devices and series.