Labconco XPert Nano Enclosures 38876 Series - Manual (Page 9)

Chapter 2: Prerequisites
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The corners of a building typically have less vibration than the center.

The bench with the balance enclosure should not contain any vibration-
producing equipment, such as shakers or pumps.
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Marble slabs with dampening pads placed within the enclosure are also an
effective low cost means of controlling vibration.

The balance should be calibrated and verified at least annually; for best
results, the balance should be calibrated inside the enclosure while running at
the desired face velocity.
Temperature Variation Requirements
The extent the balance readings are influenced by temperature variations is a
function of the balance design. Most manufacturers would suggest that a
temperature drift of 1-2°C is generally tolerable. Only validation through your
Operational Qualification protocol can define what is acceptable. To minimize the
potential for temperature variations:

Never install balances near heating sources such as radiators and hot plates.

Do not place the balance and enclosure on a bench that would receive direct
sunlight.
Humidity and Static Electricity Requirements
Electrostatics can be troublesome in a balance enclosure. It is important to
understand and, to the extent possible, control static charges. An electrostatic
charged vessel, sample or enclosure can apply forces and lead to errors in
weighing. The repulsion or attraction can be detected with micro, semi micro and
analytical balances. Static charges can also lead to particulates being attracted to
surfaces within the balance enclosure. Containment of harmful powders,
prevention of cross-contamination and clean-up is enhanced when static attraction
of powders is minimized. The construction of the XPert Nano Enclosure avoids
the use of plastics, which are highly insulative.
To correct or ensure against electrostatic issues, the following additional measures
may be prescribed to improve weighing operations.

Maintain a humidity level between 45 and 60%. The ability to sustain this
humidity range can be challenging depending upon the regional climate and
HVAC system.

The XPert Nano Enclosure is offered with a factory installed ionizer which
will neutralize surface charges.