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♦ Operating Window
The purpose of the pressure monitor kit is to
shutdown the sprayer if abnormal pressure conditions
are detected to prevent spraying material that is not
mixed on ratio.
Two pressure transducers are added to read the A
and B fluid pressures in the outlet manifold and send
the readings back to the Local Control Module (LCM).
The control watches the difference between the A and
B pressures. The control will alarm if the pressures
split because of a plug, leak, or running out of fluid.
When an alarm indicates that the sprayer may be
off ratio, the air solenoid shuts off the air supply to
the proportioner motor. The light tower will indicate
an alarm has occurred, and the alarm code will
be on the LCM display. For more information see
Advisories and Alarms, page 11.
The following alarms can occur:
• Differential Pressure (B>A)
• Differential Pressure (A>B)
• Pressure A High
• Pressure B High
• Air Solenoid Disconnected
• Pressure A Disconnected
• Pressure B Disconnected
Operating Window
Below Minimum Spray Pressure
The air motor is allowed to automatically operate in
Circulation Mode with a yellow light anytime the fluid
pressures are below the minimum spray pressure.
This allows for loading the system and circulating the
fluids without alarms or shutdowns.
Above Minimum Spray Pressure
When the control sees the fluid pressures above the
minimum spray pressure for 3–30 seconds, and the
pressures are balanced within the pre-set limits, it
will automatically start the monitor mode, and the
green light on the light tower will change to solid
on. If the control does not see balanced pressures
within 30 seconds of going above the minimum spray
pressure, it will alarm and shut off the air motor. The
default minimum spray pressure is 2000 psi (14 MPa,
138 bar). Enter Setup Mode to change the minimum
spray pressure as necessary.
Maximum Spray Pressure
The control will alarm and shutdown if it sees either A
or B above the maximum working pressure of 7250
psi (50 MPa, 500 bar). Enter Setup Mode to reduce
the maximum allowable pressure set point.
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