Chapter 2: Prerequisites
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•
Never install balances near heating sources such as radiators and hot
plates.
•
Avoid incandescent lighting of the enclosure where radiant heat
produced will raise temperatures. (See Chapter 7 for adding an
accessory fluorescent light kit).
•
Do not place the balance and enclosure on a bench that would receive
direct sunlight.
Humidity and Static Electricity Requirements
XPert:
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 all enhanced
when static attraction of powders is minimized. The construction of the
XPert Balance Enclosure avoids the use of plastics, which are highly
insulative. The advantages to the glass and epoxy-coated metal construction
are twofold.
1. The enclosure does not contribute high electrostatic forces affecting
the precision of the balance.
2. The attraction and ultimate accumulation of powders, (hazardous or
nuisance), are minimized on the inside of the enclosure.
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.
•
Ionizers in various forms (guns, bars and blowers) are effective ways to
flood an area with ions and essentially “neutralize” electrostatic
electricity.
Summary of Contents for Protector XVS Series
Page 49: ...Chapter 7 Accessorizing your XPert or XVS Enclosure Product Service 1 800 522 7658 45...
Page 54: ...Appendix A Replacement Parts Product Service 1 800 522 7658 50...
Page 56: ...Appendix B Dimensions Product Service 1 800 522 7658 52 2 3 and 4 Units...
Page 57: ...Appendix B Dimensions Product Service 1 800 522 7658 53 2 3 and 4 Units...
Page 58: ...Appendix B Dimensions Product Service 1 800 522 7658 54...
