Bronkhorst
®
9.17.057
page 21
4 Advanced operation
4.1 Using mass flow meters/controllers on different gases or under different
conditions
4.1.1 Stored calibration curves
FLOW-SMS instruments with digital pc-boards allow storage of max. 8 calibration curves for various gases or process
conditions. Fluidsets can digitally be selected when the instrument is hooked-up by RS232 to a computer, using
(Bronkhorst®) software tools.
4.1.2 Multi Fluid / Multi Range instruments
Instruments with activated Multi Fluid / Multi Range (MFMR) functionality are calibrated for standard ranges which
can easily be configured for other fluids and ranges. Changing fluid and range can be performed by means of the
software tool FlowTune, through the RS232 connection of an instrument. The program can convert the primal
calibration curve inside the instrument to the selected fluid and range.
In digital instruments with activated MFMR functionality the parameters capacity, density, unit type, capacity unit etc.
are dynamic parameters. For example, changing the capacity unit from ‘ml
n
/min’ to ‘l
n
/min’ effects that the capacity
automatically changes, for instance from 2000 ml
n
/min to 2 l
n
/min. The 100% output is not affected. Changing the
capacity from 2000 ml
n
/min to 1000 ml
n
/min effects that the instruments full scale capacity (100% output) changes to
1000 ml
n
/min. The instrument is reranged.
4.1.3 Conversion factor calculation using Fluidat software
Bronkhorst® gathered the physical properties of over 600 fluids in a database called FLUIDAT.
Application software, such as FLOW CALCULATIONS, enables the user to calculate accurate conversion factors, not
only at 20°C/1 atm but at any temperature/pressure combination, both for gases and for liquids.
Apply to your distributor for more details of this software.
Check FLUIDAT® on http://www.fluidat.com
FLUIDAT® is a collection of routines to calculate physical properties of gases and liquids. These routines
are made available at the FLUIDAT® on the Net website.
4.1.4 Sealing material
Before using for a different fluid, check if the
sealing material
of the complete module like O-rings,
plunger and packing gland of capillary are suitable for the application. The instrument is fitted with
Viton, EPDM or Kalrez seals. Which sealing material is used is shown in the last character of the model
key. It is also important to make sure that the seals of the mounting accessories (base block, adapters,
etc.) are suitable for the fluids used (see schematic diagram /dimensional drawing).
