BRONKHORST EL-FLOW Select Series - Advanced Measurement and Control

Bronkhorst®
Instruction Manual EL-FLOW® Select 9.17.099F36
Setpoint
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…32767
9
1/1
0x0021/34
This parameter is used to set the required flow rate for the controller. Within the setpoint range, value 32000 corresponds to
100%
To convert Measure and Setpoint to actual volume flows, use parameters Capacity and Capacity Unit (see Fluid set)
Temperature
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
R
-250…500
142
33/7
0xA138…0xA139/41273…41274
This parameter returns the internal temperature in the instrument housing in °C, which approximates the actual media
temperature.
Pressure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
0…3.4E+38
143
33/8
0xA140…0xA141/41281…41282
In case an external pressure sensor is connected, this parameter returns the actual system pressure in bar(a).
If there is no external pressure sensor, the default value of this parameter is equal to parameter Inlet pressure.
4.3.1 Advanced measurement and control
Fmeasure
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
R
-3.4E+38…
3.4E+38
205
33/0
0xA100…0xA101/ 41217…41218
Floating point variant of Measure. Fmeasure shows the measured value in the capacity unit for which the instrument is set.
The instrument uses parameters Capacity, Capacity 0%, Capacity Unit and Sensor Type to calculate Fmeasure.
Fsetpoint
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Float
RW
0…3.4E+38
206
33/3
0xA119…0xA11A/ 41241…41242
Floating point variant of Setpoint. Fsetpoint shows the setpoint in the capacity unit for which the instrument is set. Like
Fmeasure, Fsetpoint is dependent of Capacity, Capacity 0%, Capacity Unit and Sensor Type.
Setpoint Slope
Type
Access
Range
FlowDDE
FLOW-BUS
Modbus
Unsigned int
RW
0…30000
10
1/2
0x0022/35
The value of this parameter represents the time it would take to adjust the setpoint if it were changed from 0 to 100%. This
feature can be used to smooth 'nervous' controller behavior, e.g. to reduce setpoint overshoot or undershoot.
The supported range corresponds to 0…3000 seconds. Default value = 0.
Example:
If Setpoint Slope = 100 it will take 10 seconds to adjust the setpoint if it is changed from 0 to 100%. A setpoint change of 20%
will take (20%/100%)*10 seconds = 2 seconds.