Isolation System Overview; How The Isolation System Works; Electrostatically - Graco HydroShield WMBH00 Instructions - Parts Manual

Isolation System Overview

Isolation System System Overview
Isolation Isolation System
How the the Isolation Isolation System
How How the Isolation
When using a HydroShield Air-Assisted Batch
Waterborne Isolation System, the fluid supply
remains grounded. The fluid supply can be any
low pressure pump or circulation system. The
low pressure fluid supply first fills an internal low
pressure pump reservoir, that then feeds into an
isolated Merkur pump to send high pressure fluid to
the gun. After the isolation system has filled with
paint, the isolation valve separates and raises. This
allows the fluid inside the isolation system to become
electrostatically charged when the gun is triggered.
The charged fluid is attracted to the grounded
workpiece, wrapping around and evenly coating all
surfaces. When the gun trigger is released, the
isolation pump automatically refills.
4
Overview
Overview
System Works Works
System Works
Spraying Waterborne Waterborne Fluids
Spraying Spraying Waterborne

Electrostatically

Electrostatically Electrostatically
This isolation system and electrostatic air-assisted
gun are designed to spray only
which meet at least one of the following flammability
requirements:
• FM, FM, FMc FM, FMc FMc Approved: Approved: Approved:
Material does not sustain burning in accordance
with the Standard Test Method for Sustained
Burning of Liquid Mixtures, ASTM D4206.
• CE-EN CE-EN CE-EN 50059 50059 50059 Compliant: Compliant: Compliant:
Material is classified as non-ignitable as defined by
EN 50059: 2018.
For more information, see
Ignitability of Coating Materials, page
When an electrostatic gun is connected to a voltage
isolation system, all of the fluid in the spray gun,
fluid hose, and isolated fluid supply is charged to
high voltage, which means that the system has
more electrical energy than a solvent-based system.
Therefore, only non-flammable fluids (as defined
above and in Models, page
the system or be used to clean, flush, or purge the
system.
Precautions must be taken when using electrostatic
waterborne equipment to avoid potential shock
hazards. When the spray gun charges the isolated
fluid to high voltage, it is similar to charging a
capacitor or a battery. The system will store some of
the energy while spraying and retain some of that
energy after the spray gun is shut off. Because it
takes some time for that stored energy to discharge,
it is important to read the instructions, including the
Fluid Voltage Discharge and Grounding Procedure,
page 25, and Grounding, page
when you can approach or touch the gun nozzle.
The amount of time it takes to discharge the
energy depends on the system design. Follow the
Fluid Voltage Discharge and Grounding Procedure,
page 25, before approaching the front of the gun.
Fluids
Fluids
only waterborne fluids
only
98.
5) can be sprayed with
16, to understand
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