The flow rate controller type 8750 represents a closed flow control loop to
measure and control gases using the differential pressure principle. The reliable
and robust system consists of an ELEMENT control valve, type 2301, the
compact process controller type 8693 put on top of the valve and two pressure
transmitters, type 8325. The Bürkert flow rate controller does not need
a separate flow meter. The valve seat serves as variable orifice. From the
pressure difference across the valve and the given density and temperature
a volume flow, referring to the conditions programmed, can be calculated.
For that the process controller uses the flow characteristics of the valve and
the scales of the pressure transmitters programmed. The volume flow set can
then be adjusted by changing the stroke of the control valve. The flow rate
controller offers a high repeatability and large measuring range. Beneficial is
that the control itself is used for both, controling the flow and measuring over
an orifice. With the variable orifice of the control valve the measurement range
is increased significantly. Low assembly costs and easy commissioning are
further advantages of this unique product.
Type description