Introduction
7890A GC Safety Manual 5
Do not use an Uninterruptable Power Supply (UPS) with a GC
If the area where the GC is located suddenly looses power, an unsafe
condition can result if the GC remains powered on. Do not use the GC
with a UPS.
Electrostatic discharge is a threat to GC electronics
The printed circuit (PC) boards in the GC can be damaged by electrostatic
discharge. Do not touch any of the boards unless it is absolutely
necessary. If you must handle them, wear a grounded wrist strap and take
other antistatic precautions. Wear a grounded wrist strap any time you
must remove the GC right side cover.
Many parts are dangerously hot
Many parts of the GC operate at temperatures high enough to cause
serious burns. These parts include but are not limited to:
• The inlets
• The oven and its contents
• The detectors
• The column nuts attaching the column to an inlet or detector
• The valve box
You should always cool these areas of the GC to room temperature before
working on them. They will cool faster if you first set the temperature of
the heated zone to room temperature. Turn the zone off after it has
reached the setpoint. If you must perform maintenance on hot parts, use a
wrench and wear thermally protective gloves. Whenever possible, cool the
part of the instrument that you will be maintaining before you begin
working on it.
Be careful when working behind the instrument. During cool-down cycles, the GC
emits hot exhaust which can cause burns.
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