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Designed to be used with high flow-rate FLOW UNITS, L and XL.

  • Flow Unit HQ connector 1/4-28 Flat-Bottom for 1/16? OD tubing (x2)
  • Ferrule for HQ Flow Unit (x4)
  • FEP Tubing 1/16” OD x 0.020” ID (1m)
icon questions


  • Connect the USB cable between your computer and the Flowboard. The green led is now switched on.
Flowboard powered on connected via USB
  • Connect the Flow Unit on the Flowboard.
FRP faq 2
  • The flow-rate calculated by the FLOW UNIT is based on a temperature diffusion-advection measurement with the glass capillary. If your fluid is not pure water (or isopropanol) you first need to add a scale factor to calibrate your FLOW UNIT.
  • There might be a leak within your system. Please check if your system is completely tight before going any further.
  • This might be because of your screwed fitting. Please unscrew and then re-screw it.
  • Your fluid controller may not be as precise as the FLOW UNIT sensor.

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Most of the times, flow-rate peaks represent air bubbles. In order to get a stable measured flow rate, you have to remove all the air bubbles into your set-up. To achieve this, flush your set up by applying a higher pressure until air bubbles disappeared. Besides, you own flow controller might not deliver a stable flow. Contact us for more information.

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You can calculate a scale factor which will correct the measured flow-rate returned by the Flow Unit.

The different FLOW UNIT models are calibrated to provide an accurate reading when used with the corresponding fluid, water or isopropyl alcohol.

For the FLOW UNIT models XS/XL, only one single calibration for water is available. For the FLOW UNIT models S/M/L, two calibrations are available: Water and Isopropyl alcohol.

The FLOW UNIT can be used to handle different fluids not originally calibrated for. When possible, select a standard calibration field that most closely matches your fluid.

For example, water calibration can be used for water based solution and isopropyl alcohol calibration for hydrocarbons or oil. The calibration can be selected and switched in the software.

In order to obtain accurate flow-rates for alternative fluids, it is necessary to use correction factors (scale factor), to convert the displayed value into the actual value. The scale factor can be added in the software. Adding the scale factor ensures that the flow sensor reading is now accurate for the target fluid.

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The following section explains how you can calculate this scale factor and shows an example with a fluorinated oil: FC-40.

A method for providing a known flow-rate is required to work out the scale factor for the selected fluid. This could be a syringe pump, a peristaltic pump or a pressure regulator delivering fluid onto a precision balance with volume calculated from known density. Here is an example using MFCS™-EZ.

Make a table that contains the time for each measurement, results from weighing scale, the flow-rate of the pump and the data measured by the FLOW UNIT. A minimum of 3 measurements is recommended for each flow-rate.

The principle of the experiment is to inject the FC-40 through the desired FLOW UNIT model connected to the FLOWBOARD. Then simultaneously you record the flow-rate given by the software and you measure the weight of fluid you have collected over a chosen period of time. Knowing the density of the fluid, you are able to define the actual flow-rate.

Note that if a peristaltic or a syringe pump is used, one has to wait until the target flow-rate is reached (settling times can be long) and to calculate an average flow-rate due to the pulsations.

FRP faq 8

The list of materials needed to reproduce the experiment is given below:


– One (1) FLOW UNIT model

– One (1) MFCS™-EZ or with the appropriate pressure range (1 bar for FC-40) and MAESFLO™ software.

– One (1) precision weighing scale

The table below displays the information recorded during the experiment: the pressure imposed by the MFCS™-EZ, Qs the flow-rate recorded by the FLOW UNIT through the Flow-Rate Platform software, Qw the flow-rate measured with the precision weighing scale, and Qw/Qs the calculated scale factor for a single point calibration.

Flow rate calculation table

Consequently, when working around 317 ?l/min (target flow-rate), you have to add the scale factor of 3.5 so that the measurement of the sensor corresponds to the actual flow-rate for FC-40.

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