Bronkhorst Mini CORI-FLOW - Manual (Page 10)

BRONKHORST CORI-TECH B.V.
1.1.5 Liquid dosing systems with pumps
In Bronkhorst liquid mass dosing systems Liqui-Flow or CORI-FLOW instruments control liquid mass flow
using a pump through a U/f converter. The pump is just used as an actuator to follow the controller to achieve
the wanted mass flow (setpoint). It is not used as a positioner as it normally is, using the standard pump control
software. Normally Bronkhorst will take care of all electrical and mechanical connections between the parts as
mentioned above are realized, as well as an optimization of the PID-control and a test on water/IPA (when
possible).
The analog controller output signal, which normally would be used to drive a proportional valve, is limited to
either 10 Vdc/15 Vdc and connected to the analog input signal of the pump drive.
Each Liquid Dosing System consists of a flow sensor with controlling function, a pump and all inter-connecting
material. A filter and check valve can be supplied on request. Furthermore, Bronkhorst will take care of
electrical and mechanical connection, testing and optimization including the PID-integrated controller.
In addition to the Bronkhorst Liquid Pump for small flow ranges, a complete series of pumps is available for
those applications which require higher flow rates, higher pressures, wide control ranges or aggressive fluids.
Further to operation in an analog mode, the system can also be used digitally with RS232 or with on-board
interface to PROFIBUS-DP ® , DeviceNet™, Modbus-RTU, or FLOW-BUS.
See picture below for schematic setup.
Please note that for proper functioning of the pump or valve the MFC needs to be adjusted electrically and also
needs to be provided with the right parameter settings. This will be taken care of in our factory.
For pump- or valve connections in the field after delivery, please contact your local sales representative.
page 10 9.17.050