Bronkhorst EL-FLOW Prestige - Manual (Page 35)

Bronkhorst High-Tech B.V.
EL-FLOW Prestige 35 9.17.084
Value Mode Instrument action Setpoint source Slave factor
20 Valve Steering Setpoint is redirected to ‘ 55 Valve Output’
with controller idle
21 Analog Valve
Steering
Analog input is redirected to ‘ 55 Valve
Output’ with the controller idle
22 Valve Safe State valve is in safe (unpowered) state
(closed for N.C. valves and fully opened
for N.O. valves)
Instrument control modes
After power-up the ‘ 12 Control Mode’ will be set to ‘Analog input’ or ‘BUS/RS232’, depending on the customer’s default setting for
analog or digital operation. If however the ‘ 12 Control Mode’ is set to a value other than 0, 1, 9 or 18 the actual control mode setting
is maintained after power-up.
For information about master/slave controller operation through the FLOW-BUS interface, see section 4.3.1.
See section 4.4.2 for changing the default control mode using the ‘ 86 IOStatus’ parameter.
4.2.3 Advanced fluidset, range and operating conditions parameters
For changing fluidset, flow range or operating conditions it is strongly advised to use the FlowTune TM software
available with the EL-FLOW Prestige instrument. FlowTune checks any changes for compatibility of the process
conditions with the instrument. When the parameters discussed in this section are changed manually, no such checks
are performed and the instrument output may become disordered or the instrument may even be damaged if used
in conditions the instrument is not suited for. Consult Bronkhorst service personnel when in doubt.
Fluid Number
Type Access Range FlowDDE FLOW-BUS Modbus
Unsigned char RW 0…7 24 1/16 0x0030/49
With the ‘ 24 Fluid Number’ parameter any of the maximum 8 available fluid sets can be selected. Each fluid set has its specific
(configurable) properties, such as ‘ 25 Fluid Name’, ‘ 21 Capacity’, etc. Default value = 0 (fluid 1).
The ' 24 Fluid Number' parameter is also accessible via FlowPlot or FlowView software or any of the Bronkhorst
readout/control units (BRIGHT, E-8000).
Fluid Name
Type Access Range FlowDDE FLOW-BUS Modbus
Unsigned char[10] RW - 25 1/17 0x8188…0x818C/33161…33165
This parameter consists of the fluid name for the selected ‘ 24 Fluid Number’. This parameter may contain three value types:
Gas name, e.g. 'N2', 'He', 'C3H6 #2'.
CAS number, e.g. '7727-37-9', '7440-59-7', '115-07-1'
'Mix': when the ‘
25 Fluid Name’ value is 'Mix', the instrument will use the gas mixture stored in the parameters ' 346 Mix Fraction
Type', ' 347 Mix Fraction Temperature', ' 348 Mix Fraction Pressure', ' 349 Mix Fraction Index', ' 350 Mix Fraction', ' 351 Mix Component
Name'. The instrument will ignore custom (fixed) fluid properties stored in the parameters ' 170 Density', ' 250 Heat Capacity',
' 251 Thermal Conductivity' and ' 252 Viscosity'.
Use the FlowTune TM software to set the instrument for using (fixed) custom fluid properties, e.g. obtained from
FLUIDAT on the Net.
When no valid ' 25 Fluid Name' is entered or when insufficient or invalid fluid properties are entered, the instrument
will be forced into the 'Valve Safe State' mode until a valid fluidset configuration is made.