Burkert Type 8623 - Manual (Page 9)

8623-2-Standard - 7
english
• Mixing of two fluids
• Control of one fluid flow via a second fluid flow
In ratio control, the flow in one pipe run is fed into the flow ina second pipe run
at a certain ratio. The ratio is adjustable between 0.00 and 10.00. The two flow
rates are measured using two flow sensors with frequency outputs.
Q
1
= v * Q
2
3.2 Ratio control
Q
1
controlled flow rate
v ratio factor
Q
2
uncontrolled flow rate
Fig.: Structure of a ratio control system with the compact flow controller type
8623-2 (schematic)
Setpoint (2- 1,000 Hz)
Controller Type 8623-2
actual value
(2-1,000 Hz)
flow rate
sensor 1
flow rate
sensor 2
controlled flow
rate Q 1
flow rate Q
2
(uncontrolled)
proportional valve