HP Metal Jet S100 User Manual page 9

amounts of material remaining after preliminary cleanup, must be removed using an explosion-
protected vacuum cleaner.
● Inside and outside the equipment should be cleaned regularly with an explosion-protected vacuum
cleaner to avoid dust accumulation. Do not sweep the dust or try to remove it with a compressed-air
gun.
● An explosion-protected vacuum cleaner certified for collection of combustible metal dust is
required for cleaning. Take measures to mitigate powder spillage and avoid potential ignition
sources such as ESD (ElectroStatic Discharges), flames, and sparks. Do not smoke nearby.
● An explosion-protected vacuum cleaner compliant with the following normative specifications:
– Europe/International Electrotechnical Commission (IEC): Zone 22 or better, temperature Class
200°C (392°F) maximum.
– United States/National Electrical Code (NEC): Class II, division 2 or better, temperature Class
200°C (392°F) maximum.
– Suitable for conductive powder (IIIC and/or group E).
–
Refer to the material safety data sheet (MSDS) and meet local regulations.
– Recommended equipment fitted with wet filter (vacuum with submerged flow inches inert liquid)
or High Efficiency Particulate Air (HEPA) filter grade.
● The equipment and accessories must be properly grounded at mains outlets only; do not
manipulate internal bonding. If static discharges or electrical sparks are noticed, stop operation,
disconnect the equipment, and contact your support representative.
● The auxiliary equipment (that is, the oven for the rebaking process) (not provided by HP) must
be explosion-protected for combustible dust and flammable vapors, according to the explosion
protection document (EPD) or explosion hazard analysis covering the probability of an explosive
atmosphere and presence of effective ignition sources as per local laws requirements. Refer to the
safety data sheet of the powder being processed.
● The tanks or drums have to be electrically conductive or dissipative, and the powder cannot
generate mechanical sparks. In addition, the earthing clamps are necessary to ground the tanks
or drums during use.
● Follow the cooling time and ensure a maximum powder temperature of 70°C (158°F) before putting it
into the load station.
● Ground the Portable Tank and drums using static earthing clamps during unloading. The Portable
Tank is secured with a tri-clamp and earthed using a metal chain. When in motion, the Portable Tank
is earthed through the chain. To ensure effective dissipation with the metal chain, the resistance of
the floor to leakage must be less than 100 MOhms.
● HP recommends the use of HP equipment for unpacking 3D parts and refilling the Build Unit. If other
methods are used, read the following notes:
– Dust clouds generated during handling and/or storage can form explosive mixtures with air.
Dust explosion characteristics vary with the particle size, particle shape, moisture content,
contaminants, and other variables.
Explosion hazard 5