Bronkhorst®
Instruction Manual EL-FLOW® Prestige 9.17.084N8
Numerous input/output options can be installed through the programmable 9-pin D-sub connector (from factory). In
addition to the various analog signal options and the standard RS232 communication, there are such options as RS485
communication, digital frequency/pulse output, alarm output/reset, valve purge/close and analog valve output.
Furthermore Bronkhorst offers various integrated fieldbus options: DeviceNet™, PROFIBUS DP, Modbus RTU/ASCII, EtherCAT®,
PROFINET and FLOW-BUS.
1.3.1 EL-FLOW® Prestige PI
The EL-FLOW® Prestige PI (pressure insensitive) adds active pressure compensation
to the already very accurate controlling characteristics, resulting in even more
accurate flow measurement and control stability.
An innovative static compensation algorithm ('FLUIDAT On Board') uses the actual
fluid temperature and pressure to calculate fluid properties in real time. Density,
viscosity, thermal conductivity and heat capacity of the processed media change
under the influence of pressure and temperature. The Fluidat On Board algorithm
continuously recalculates these properties and uses them to adjust the gas flow.
Dynamic pressure compensation detects rapid and large pressure changes (caused,
for instance, by operating multiple flow devices on the same fluid line, also called
the Crosstalk Pressure Effect) and adjusts the control signal in such a way that the
gas flow remains stable.
The EL-FLOW® Prestige PI is available with a choice from two different pressure sensors (up to 10 bar(g) and up to 100
bar(g)), both of which apply static compensation. The 10 bar type also uses dynamic compensation.
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