Bronkhorst®
Instruction Manual EL-FLOW® Select 9.17.099F20
3.3.1 Changing fluid set
Optionally, EL-FLOW® Select instruments can provide Multi Fluid/Multi Range functionality (MFMR;
available if and as specified at ordering time). If MFMR is enabled, this is indicated in the lower left
corner of the serial number label.
MFMR enabled instruments are calibrated ex factory for a number of standard measuring ranges, which can be configured
for use with different fluids. Defining fluids and ranges and selecting the active fluid can be done via RS232 with
FlowTune™.
FlowTune™ provides the following key functionality:
· Definition and storage of up to eight different fluids in the instrument
· Storing fluid properties for any gas
· Changing inlet- and/or outlet pressure based on actual process
conditions
· Re-ranging the full scale (FS) flow rate within the instrument's
supported flow range
· Changing control speed per fluid set for faster or slower (smoother)
flow control
MFMR functionality is available for the full temperature and pressure range of the instrument. FlowTune™ checks the
changes for the following limitations:
· Rangeability of the flow sensor for the selected fluid
· Rangeability of the control valve for the selected fluid
· Accuracy indication for the given flow range
· Compatibility of selected gases with the used sealing materials (see Sealing material compatibility)
· Limitations to the operating conditions
After all limitation checks are passed, the entered properties are stored in the instrument, including the required controller
settings. When switching to another fluid set, controller settings are automatically adjusted to the new process conditions,
so there is no need to change PID controller settings manually.
The FlowTune™ software and the associated documentation can be downloaded from the product pages on the Bronkhorst
website: www.bronkhorst.com/products
To connect with FlowTune™, use RS232 communication via the 9-pin D-sub connector. In case a connection cannot be
established, use the power-up functionality of the multifunctional switch to switch to configuration mode and enable
RS232 communication.
After configuring the required parameters, remember to return the instrument to the original communication mode.
It is advised to use FlowTune™ only in a non-operational environment. FlowTune™ will force the instrument to Valve Safe
State as soon as the connection is made. Be sure to close communication between FlowTune™ and the instrument
properly, to restore the normal operating mode.
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