MEDC Ex FernTel IP - Manual (Page 8)

8 Manual FernTel IP Z2 UL
• The required general purpose has to be respected. The device must be
mounted on a closed rear panel in vertical mode or used as a desktop unit.
• A magnetic field with disturbing frequencies can adjust a disturbance of the
acoustic quality. Pay attention to an acceptable installing place.
• For opening the device must be free of power.
• In opened state of the telephone dust must not attain into the device.
• For the impermeability of the housing necessary gasket respectively the
protective cover at the upper part must not be damaged during mounting or
dismounting.
• After repairing of the device for use in dust environment, the repaired parts
have to be tested again.
• The speech speed hopper of the handset consists out of a not electrical
conductive plastic material. It may be charging with high air speed
dangerously. A cleaning of the speech speed hopper with pressed air is not
allowed.
• Changes of the product for technical improvement are possible without
announcement before.
• The telephone has to be included into the potential equalisation either with
the internal earth connecting bolt of the metal plate or with the external earth
connecting bolt at the housing. The potential equalisation must exist inside
and outside of the explosion at risk area. The potential equalisation is
necessary to support the explosion protection.