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Flow Rate Sensor

Flow meter and leakage sensor fluid-check with hydraulic measuring point Serv-Clip Type 2 for hydraulic and gear oils.

  • Monitor flow rate and wear of pumps/cylinders
  • Operability of accumulators
  • Measure filter transmittance, heat exchanges, and nozzle flow rate
  • Capture speed of hydraulic motors

How Does It Work?

Led lights inform from 4..20mA stand of flow up to 630bar(9,100 psi), from minimal quantities like 0,02 L/minute and for diameters from 12mm can be put in practice the fluid-Check®. The leakage sensor fluid-Check® is ready to be use and will be programmed by BOLENDER-Germany according necessities of the client in liters or gallons per minute. It is based on the calorimetric principle, that means the sensor head has an intern thermo element and heating where the running oil temperature will be measured. The measuring cycle takes 3 seconds.

The sensor head temperature raises at 2°C. The time for this will be measured and the flow rate will be calculated. The needed time for measuring is 15 seconds. The special on this “made in Germany” product is not only the easy installation of 5 minutes- no cutting pipes and without contamination with an Allen wrench.
The hydraulic operator gets with the fluid-Check® sensor and the measuring connection serv-Clip® with ¾” screw that opens a wide choice of measuring devices because one can deinstall the fluid-Check® and install at the same point sensors-transducers for temperature, pressure or manometers, pressure gauges, hydraulic horses.

BOLENDER-Germany promises to meet the complex requirements for fluid measuring and pipe working with a cheap solution avoiding consequential expensive reparations of hydraulic systems.

For pipes over 3“ (88,9 mm) and wall thickness from 6 mm ask about our adapter SC-XE-607.

Calibration and Technical Information

You get pro sensor a data sheet with curves (comparison mA with l/min). Inform us the ID of the pipeline and the wished measuring range from/to in l/min.

Measuring range

0.05 . . . 8 Meter/Second

Flow rate

up to 600 Liter/Minute

Temperature rate

0.02/ Liter/Minute depending on ID


630 Bar (9100 psi)

Temperature coupling

-20 to 80°C

Threaded coupling

G 3/8 male


+/- 2%


3 wires

Output signal

4 . . . 20 mA (Analogue)

Power supply

24 V DC +/- 10%; 150 mA


M12 Universal system 

For pipes with

O 12 mm and larger


6 LED lights


per Micro button

Protection mode

IP 65

Sensor head

stainless steel 1.4571


PBT (QS-2-B-008 / LS - 2- B...) or stainless steel (QS - 1 - B - 008 / LS-1-B...)

*For stainless steel pipes up to 5.5 mm wall thickness, please contact us about our special needle Art, Nr. 501-041-02