Operating instructions DPK 6207…
© BA_DPK_EN_Rev06-2010.docx Page 16 of 18
Only dust with an ignition temperature of over 200°C and a minimum ignition energy of over > 3 mJ may be
handled by steel structures where there is a the risk of internal strikes by sparking foreign bodies. A gas
atmosphere may only exist in Zone 2. Otherwise a complete stainless steel structure is permitted.
Gases in explosion group II C are generally not permitted.
Only non-conductive coatings with a disruptive discharge voltage of max. kV may be used internally.
No insulating coatings with a thickness of over 2 mm may be applied to the exterior of the equipment.
The maximum surface temperature of the housing is determined by the temperature of the product. This
temperature must be defined outside the equipment on the basis of the glow and ignition temperatures of dusts
and gases. The following rule of thumb applies:
- The maximum surface temperature is 80% of the ignition temperature of the gas (in °C)
- The maximum surface temperature is 2/3 of the ignition temperature of the dust (in °C)
- The surface temperature is at least 75 K below the glow temperature of the dust
Equipment which falls under the scope of Directive 94/9/EC must be inspected and serviced if necessary
regularly and at reasonable intervals. The manufacturer recommends that this be carried out every month – if
the operating conditions remain the same, the intervals may be adjusted.
The exterior surfaces are to be cleaned immediately if they become dirty – dust deposits with a layer thickness
of over 5 mm must be prevented at all costs.
Any modification to the equipment requires the written consent of JAUDT. In particular, speed and velocities
must not be increased. In general the relative speeds between moving metallic parts must not exceed 1 m/s.
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