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FLUIGENT
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10.
Frequently Asked Questions
How can I clean the Flow Unit after use ?
See §7 how to do it.
In which range of temperature the values given by the sensors stay accurate?
The FLOW UNIT sensors are already temperature compensated, so they work in a range of 10°C to 50 °C. This
can be useful if your device needs to be contained within an incubation chamber.
Will the size of the capillary of the XS FLOW UNIT model have an influence on my system?
Yes the diameter of the capillary is small: 25 µm, so depending on the size of your system, you may need to
push your fluids harder to obtain a given flow-rate. Then the maximum pressure drop between the sides of the
XS FLOW UNIT model at maximum flow-rate is 0.8 bar.
Is there a specific way of washing the XS FLOW UNIT?
You can find cleaning procedures in §4.3. Concerning specifically the XS FLOW UNIT, it may withstand pressures
up to 200 bar, so is it possible to use high pressure or flow-rate pumps in case of clogging.
Is there a specific way to prevent clogging in XS FLOW UNIT?
It is possible to add a filter in the fluidic path. As an example, you can find among Idex products, biocompatible
precolumn filters (references A-355, A-356). These filters are designed for use with 1/16
’’
OD tubing. You can
choose either 0.5 µm (A-700) or 2 µm (A-701) frit version to filter particles from you flow path.
Why is the flow-rate measured by the FLOW UNIT not stable?
Some fluid controllers are unable to limit the fluctuations of the flow-rates around a mean ordered value
because of the mechanical actuation they use. How to connect tubing to the FLOW UNIT models Therefore, the
flow-rate within your system can be an imprecise response to the fluid controller.
Visit us on
www.fluigent.com
for further information.
Why will the measured flow-rate not reach a steady state?
For some fluid controllers, the settling-time may be long. For this reason, the transition phase after an order
change in the fluid controller takes much longer, depending on the nature of the fluid controller.
Visit us on
www.fluigent.com
for further information.
Why does the flow-rate measured by the FLOW UNIT not match the ordered flow-rate on my fluid controller?
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.
See section
8
for more details on the calibration of the
FLOW UNIT.
There might be a leak within your system. Please check if your system is completely tight before going
any further.
See §4.2 how to connect your FLOW UNIT.
The settling time may be long.
Check your fluid controller supplier for more information.
Your fluid controller may not be as precise as the FLOW UNIT sensor.
