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Safety tips for handling electronic measurement devices
Protective lead
connection
Risks of loss of
protective lead
continuity
Proper operating
voltage
Risks involved in
opening the covers
Risks involved in work-
ing with an open unit
Charged capacitors
Use of proper fuses
When safe operation
can no longer be
assured
WARNING
EXPLOSION HAZARD
6
The protective lead should be attached to the protective lead connector before any
other connection is made.
The unit can be hazardous if the protective lead is interrupted inside or outside the
unit or if the protective lead is disconnected.
The unit voltage must be set to match the line voltage before the power supply is
activated.
Current-bearing components can be exposed when the covers or parts are
removed, even if this can be done without tools. Current can be present at some
connection points.
The unit must be disconnected from all power sources before any maintenance
work is performed.
The unit capacitors can retain their charge even when the unit is disconnected from
all power sources.
Only fuses of the specified type and rated current should be used as replacements.
Never use patched fuses. Do not short-circuit the fuse holder contacts.
If it is apparent that safe operation is no longer possible, the unit should be taken
out of operation and secured against unauthorized use.
The possibility of safe operation is excluded:
If the unit is visibly damaged
If the unit is no longer operational
After prolonged storage under adverse conditions
After severe transport stresses.
Substitution of components may impair suitability for Class I, Division 2.
Do not disconnect equipment unless power has been switched off or the area is
known to be non-hazardous.
I/O connectors must only be connected to Class 2 circuits.
SCC-F Sample gas feed unit Operator's manual
42/23-51 EN Rev. 3
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