2–14
Overview
Flow Control Overview
Flow Control Components
(Refer to Fig. 2.7)
Flow Meter
Digital pulses are sent by the flow meters to the con-
troller to provide fluid flow rate information.
Fluid Regulator
The flow control regulates the fluid flow to a pre-pro-
grammed flow rate by adjusting the fluid regulator. The
fluid regulator uses a pneumatic pilot pressure from a
current to pressure (I/P) transducer to open and close
the regulator needle.
Current to Pressure (I/P) Transducer
An adjustable pneumatic signal is required for the
controller to regulate the fluid flow. The current to
pressure transducer provides this signal. The controller
outputs an analog current signal that varies from 4
milli-amps to 20 milli-amps and the transducer
changes the milli-amp signal to a 1–100 psi (7–700
kPa, 0.1–7 bar) pneumatic signal. The pneumatic
pressure signal is applied to a fluid pressure regulator,
which controls the output fluid pressure to the air spray
gun.
PrecisionMix II 3K Controller
The controller can be configured to control and display
the fluid control information, including setpoint, actual
flow, milli-amp output values to the I/P transducer,
system parameter, and I/O conditions. The controller
will indicate when the system is operating within flow
control tolerance and when it is not.
Flow Control Station
The Flow Control Station consists of a Flow Control
Reset/Warning light and Flow Control Reset button,
which are used with manual air spray guns to manually
initiate flow control reset.
Flow Control Reset Button
Pressing the reset button will cause the flow control
system to calibrate the flow rate to the current setpoint.
Flow Control Reset/Warning Light
The controller activates the Reset/Warning light when
the flow control system is resetting flow rate (solid
light) or when a flow control alarm condition occurs
(flashing light––flow rate is outside the set tolerance).
Flow Rate Alarms
Wait for the system to automatically calibrate the flow
rate or manually reset the flow rate by pressing the
reset button.
Flow Control Station
Fig. 2.8
Flow Control Reset/
Warning Light
9003A
Flow Control
Reset Button
Содержание PrecisionMix ii
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