KERN & SOHN OEX Safety - Manual (Page 12)

12 OEX-BA-e-1410
6 Changing the scale place of operation

While moving a scale in another place of operation, all safety
measures listed in point 5 of this instruction should be taken.
7 Cleaning and maintenance

Unplug the power adapter IEX-A01 from mains.

Check wether the indicator´s electrostatic grounding is correctly plugged and
is not defected.

Clean the scale and the housing with a slightly moistened cloth. You
can use typical domestic cleaning agents.

For clearing an overlay of the indicator do not use agents that can
mechanically scratch the surface. It includes an internal conductive
layer that is important for save operation.

Platform levelling feet and shock absorbers are made of rubber.
Within the hazardous area they need to be cleaned with a slightly
moistened cloth. Moisture protects against gathering electrostatic
charges.

While cleaning the platform do not damage the masking springs.
They are for gathering electrostatic charges from the weight pan.
They should be ~5mm above the shock absorbers.

Cleaning may not be performed when there are explosive gases.

There is forbidden to us concentrated acids, bases, solvents or
alcohol for cleaning the device.

There is also forbidden to use compressed air and high pressure
washing equipment.
8 Technical surveys

Technical inspection of a scale operating in explosive area has to be
carried out by a trained personnel at least once every three months.
Each technical inspection has to cover:
 Condition of scale’s indicator electrostatic grounding, including:
o Its mounting to the indicator’s housing and connection resistance - max.
100Ω,
o Mounting of a steel flexible tube protecting a conductor to the weighing
platform and the indicator (reg. scal
es with indicator “on a cable”).

Quality of the connection between the platform and the indicator (pliant steel pipe
connecting the two subassemblies).

The damage and loosing one of connection is inadmissible.

Electrical connection between the housing and the platform - max. resistance
between the weight pan (put on) and the housing should be lower than 100Ω.

Stability and levelling of the scale.