Dual Calibration; Principle - Fluigent FLOW UNIT User Manual

Bubble detection
When air is detected, red aeras will be displayed on the flowgraph
over the period of detection.
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SETTING UP

DUAL CALIBRATION

Principle of single and dual calibration
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 model XS, 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 neces-
sary to use correction factors (scale factor), to convert the displayed
value into the actual value. The scale factor can be added in the
software (see Custom scale factor in the corresponding user manual).
Adding the scale factor ensures that the flow sensor reading is now
accurate for the target fluid.
The following section explains how you can calculate this scale factor
and shows an example with a fluorinated oil: FC-40.
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