Bronkhorst®
Instruction Manual MI Series Industrial mini CORI-FLOW™
9.17.120A
17
·
To avoid simultaneous heating and cooling of different parts of the instrument, make sure the ambient temperature is
as stable and evenly distributed across the environment as possible.
·
Avoid temperature shocks; heating or cooling should amount to no more than 1 °C per second.
·
Make sure that the media temperature matches the ambient temperature as closely as possible.
·
The mini CORI-FLOW™ will show an amount of self heating, due to power dissipation of the electronics. This effect can
be as large as approximately 15 °C (depending on media and ambient temperature). In practice, there will be a balance
between media temperature, self heating and ambient temperature.
·
Operation in a cool environment can compensate somewhat for the effect of high media temperatures.
·
Heating and cooling effects will also depend on the cooling/heat conducting capacities of the installation itself on which
the instrument is mounted.
Make sure the temperature in the housing does not exceed 70°C, otherwise the electronics might get damaged. To check
this, the internal temperature output can be used (parameter
, e.g., via FlowDDE or a readout and control
unit (E-8000 or BRIGHT)).
3.6
Communication
The following table lists the supported communication modes of the mini CORI-FLOW™:
Connection
Type
Communication standard
Fieldbus/protocol
Main terminal
Analog
0…5Vdc
0…10Vdc
0…20mA
4…20mA
n/a
Digital
RS232
ProPar
RS485
FLOW-BUS
Modbus (RTU/ASCII)
HART
HART
Fieldbus terminal
Digital
RS485
FLOW-BUS
Modbus (RTU/ASCII)
PROFIBUS DP
Ethernet
PROFINET
EtherCAT®
The communication standards (analog and digital) and fieldbus interface (if applicable) are specified at ordering time, i.e.:
·
In analog mode, the instrument is set to the specified voltage/current range
·
The dedicated fieldbus connection only provides the specified fieldbus interface
Using analog and digital interfaces simultaneously
The instrument can be operated via the analog and the digital interface at the same time; analog signals and digital
parameters can be read (or changed) simultaneously. The instrument accepts a setpoint from either the analog or any of the
digital interfaces (this is called the control mode; see
for more information). In analog mode, the analog
input and output signals are translated to the digital setpoint and measure parameter respectively. The default control
mode (analog or digital) is selected at ordering time.
3.6.1
Analog operation
With analog operation the following signals are available:
·
output signal: measured value
·
input signal: setpoint (controller only)
Setpoints below 2% of the full scale will be interpreted as 0%.