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Product Information 

  • The H2F-CU12FM Water Flow Meter is designed to be fitted into water lines ONLY to display flow per minute & total litres used

  • This flow meter is perfect for stationary installations such as water filters, water coolers & dispensers, irrigation & electronic projects as well as hydroponics and machinery cooling systems

  • This flow meter is NOT suitable for fuels

Fitting Recessed Display 


  • The LCD Polarised Display on the H2F-CU12FM Water Flow Meter is designed to be only visible when viewed from horizontal and below.  When viewed from this angle the display is extremely clear

  • Using the display as a template mark out hole and cut to suit

  • Fix in position with bolts provided or suitable screws

H2F FM Viewing Angle.jpg


Connecting Sender Unit  (refer diagram below)

  • The sender unit must be installed in the horizontal position

  • The thread specification of the sender unit are 1/2" BSP Male

  • Make sure the sender is fitted with the water flow in the direction of the arrow

      noting that flow direction is one way

  • The display comes pre-wired with an approximately 1.4m sender cable  

  • Extra 1.4m & 3m extension leads are available for the three pin plugs

  • Up to 6 leads may be joined to make 9.8m in total length

  • Please Note:  Sender leads cannot be cut and joined – this will void your warranty, extension leads must be used

Connection to 12Volt DC Adapter


  • It is recommended that you get the 12v power from the ignition or a separate switch

  • Simply cut off the two pin 12v plug to the required length and connect the black wire to the negative terminal and the red wire to the positive power source

  • The back-light will stay ON when connected to 12v

  • All settings and amounts will be stored if power is disconnected


Current use at 12Volt DC Adapter

  • 1 mA when operational

  • 0.015 mA when asleep 

  • Please Note: 1,000 mA (milliamp) = 1 A (amp)

Programming & Display Selection

  • Press "DISPLAY" button to turn display on the screen

  • To set the Display for the 1/2" sender supplied you will need to press both buttons at the same time & release.  "H22" is the setting that you need displayed

  • If "H22" is not displayed, continue to press and release the "DISPLAY" button until "H22" is displayed

  • Press "DISPLAY" button again this will display the accumulated flowing volume (flow totalisation) or real time flow rate

  • Press and release "RESET" button for four seconds which will reset the total measuring volume to zero

  • All settings and amounts will be stored when the screen turns off

  • Please Note:  The maximum monitoring capacity is 99,999 litres



  • The Topargee H2F-CU12FM Water Flow Meter will automatically turn on when there is water flowing through the sensor 

  • It will automatically turn off 10 seconds after there is no water flowing

  • Blue back-light remains on unless a switch is fitted in power line


  • Press and hold the "RESET" button for 4 seconds

  • The total measuring volume will be reset to 0


  • ​Colour                              White

  • Power                               12 Volt DC

  • Mounting                           Recessed Mount

  • Screen                               LCD Polarised Display

  • Sender Lead                       1.4 Meters

  • Ext Lead Option                  Yes

  • Connection Size                  1/2” BSP Male

  • Flow Rate                           1.5 - 25 LPM (90 - 1500 LPH)

  • Flow Rate Display                LPM & total amount

Please Note: flow will be restricted if maximum flow rate is exceeded. Check BEFORE purchasing / fitting

  • Pressure                              Max 6 bar (87 psi)

  • Temperature                         0 to 60℃ (32 to 140℉)

  • Suitable for Fuels                  No

  • ​Suitable for Water                Yes

  • Displays Litres or Gallons       Yes

  • Weight                               140 g (5.38 oz)

  • Accuracy                             +/- 5%

  • Materials                             Sensor Body - Glass filled PPS

                                                Turbine - PA Composite

                                                Turbine Holder - Acetal Copolymer

                                                Shaft of Turbine - #304 Stainless Steel

                                                O-Ring - EPDMR

                                                Control Unit Housing - ABS resin















Please Note: Due to continuous product improvement, specifications are subject to change without notice

Downloadable Installation Guide

Flow Sensor 38 Measurements.jpg
H2F FM Dimensions.FS.jpg

H2F-CU12FM Water Flow Meter Installation Guide

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