RMF Systems Smart Bypass Units – BPUS1B

RMF Systems success with depth filtration on hydraulic and lube oil systems and the growing demand for contamination monitoring sensors to optimize the application of the filters has led to the development of the next generation in RMF Systems technology:  RMF By-pass filters with an integrated CMS unit.

Smart By-Pass Units enable machine operators to keep their hydraulic oil clean and monitor contamination levels real-time in one economical installation.  The integrated CMS (Contamination Monitoring Sensor) can be combined with the entire selection of By-Pass Units in the RMF Systems range.

The CMS in-line contamination monitor automatically measures and displays particulate contamination, moisture and temperature levels in various hydraulic fluids where ongoing measurement or analysis is required.

  • Measures and displays the international standard formats
    • ISO 4406: 1999, NAS 1638, AS 4059E and ISO 11218
  • 8 Channel solid contamination measurement
  • Moisture (RH) & temperature option
  • 9-36 Volt DC
    Large backlit display and keypad
  • Multicolour LED status alarms
  • Programmable alarm relays
  • PC/PLC operation
  • Windows based software included
  • RS 485 communication standard / USB optional


  • Excavators
  • Wheel loader
  • Forestry machines
  • Asphalt machines
  • Concrete pumps
  • Aviation ground support equipment
  • Agricultural machines


  • Extremely clean oil due to high filtration efficiency
  • Permanent reporting of contamination levels
  • Permanent reporting of moisture RH % and temperature
  • Prevention of channel forming by radial filtration direction
  • Large dirt and water holding capacity
  • Compact and easy maintenance
  • Environmentally friendly elements available
  • Longer usage life for oil and components
  • Reduces cost of ownership


Product Specs

Filter housing material:     Anodised Aluminium

Seal material:      NBR or FPM (see ordering code)

Nominal flow:      4.2 l/min

By-Pass opening pressure:    6.2 bar (at 0 bar back pressure)

Suitable elements:      Cellulose and Glass Fiber

Min. overhead clearance for element removal:  700 mm

Operating pressure flow control valve:   12 – 420 bar

Max. pressure filter housing:    20 bar

Max. oil temperature:     80 °C

Dirt indicator:       Pressure gauge (0 – 10 bar)

Inlet connection:      12S

Outlet connection:      ½” BSP female

Max. tank volume:      ± 1500 l

Fluid compatibility:      Hydraulic mineral fluids according to ISO 2943

Approximate weight:     11.0 kg

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