Gentek 3950301, 3940200 Location and Air Current Requirements, Exhaust and Blower Requirements

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Chapter 2: Prerequisites

The ability of a material to become polarized is a property known as permittivity. On highly insulative materials like acrylic, ions or charged molecules are strongly bound to the surface by polarization forces. The higher the force, the higher is the permittivity value of the material. It is suggested by balance manufacturers that the use of high permittivity materials, such as plastic be avoided.

Since static electricity is a surface phenomenon, materials can also be classified by their surface resistivity measured in ohms per square. The table below lists the surface resistivity of various classes of material.

Surface Resistivity Table

Material	Surface Resistivity				Example
Conductive	0 →		105 Ω per square		Skin, Metals
Static dissipative	105	→	109 Ω	per square	Glass
Antistatic	109	→	1012 Ω	per square	Polyethylene bag
Insulative	1012 Ω per square→				Acrylic, Packing foam, Styrofoam

Location and Air Current

Requirements

The XPert Filtered Enclosures have been designed to contain hazards by negating typical cross drafts and turbulence within the opening. Air movement does not affect most modern balances with draft shields. However, as a precautionary safety measure and a higher level of quality management, it is recommended that the enclosure be placed in an area to avoid:

•High traffic areas where walking might cause an air disturbance or be a nuisance to balance readings.

•Overhead or wall HVAC diffusers, fans, radiators or other lab equipment producing air currents.

•Next to doorways or windows that may be opened.

Exhaust and Blower

Requirements

XPert

System

The XPert Filtered Balance System uses an integral motorized impeller to draw room air past the operator and through the enclosure. This contaminated air is then pushed through the HEPA filter. The HEPA-filtered exhaust air is then forced out the top of the enclosure. An optional carbon filter may be installed on the downstream side of the HEPA filter to protect against nuisance odors.

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Contents User’s Manual USA Warranty Prerequisites Able OntentsMaintaining Your Filtered Enclosure Chapter Introduction Introduction About This Manual Typographical Conventions Chapter Prerequisites Support, Vibration and Movement Requirements Temperature Variation RequirementsBackground on Electrostatics or Static Electricity Humidity and Static Electricity RequirementsExhaust and Blower Requirements Location and Air Current RequirementsSurface Resistivity Table XPert Station Space Requirements Electrical RequirementsLift by the front air foil Chapter Getting StartedDo not move the enclosure by tilting it onto a hand truck Unpacking the EnclosureWork Surface and Hepa Filtered Enclosure Installation Work Surface SpecificationsFiltered Enclosure Installation XPert Station Getting Started Getting Started Carbon Filters Accessory for Odor Control only Installation of Hepa Filters Accessory Odor Control CarbonHepa Filters 115V Models Filter Type Appropriate UseGetting Started Validating the Vented Enclosure Set the Face Velocity with the Speed Control AdjustmentSealing the Filtered Enclosure to the Work Surface High Performance Features Chapter High Performance Features and Safety PrecautionsHigh Performance Features and Safety 1510 Hepa Filtered Enclosure Airflow Diagram High Performance Features and Safety High Performance Features and Safety High Performance Features and Safety High Performance Features and Safety Safety Precautions High Performance Features and Safety High Performance Features and Safety High Performance Features and Safety Planning Routine Daily Work ProceduresLoading Materials and Equipment Start-upWork Techniques Final PurgingHepa Filter Applications Suitability and Guidelines Suitable ApplicationsShutdown Odor Control Carbon Filter Applications sold as an accessory Definition of Terms Appropriate Chemicals for Odor Control Carbon Filters Prohibited Acid Use Chemical Carcinogen Use with Odor Control Carbon FiltersBalance Station, which uses a remote blower Chapter Maintaining Your Filtered Enclosure Weekly Routine Maintenance ScheduleMonthly or more often as required Decontamination Determination of when to Replace Hepa FiltersAnnually Maintaining Your Filtered Enclosure Purpose Hepa Filter Leak TestMineral oil Catalog #1491400 Acceptance Calibrate and Operate the Airflow Monitors Labconco Airflow Monitor / Airflow Switch OperationGuardian Airflow Monitor LED Monitor Calibration Enclosure Operating In-Flow Alarm Condition Set Point SpeedGuardian Digital 1000 Airflow Monitor Guardian Airflow Monitor LED with Airflow SwitchDigital 1000 Calibration OperationFactory Settings Guardian Digital 1000 Airflow Monitor Maintaining Your Filtered Enclosure Odor Control Carbon Filter Replacement Procedure See Steps for Calculating PPM and Filter Life Calculating Odor Control Carbon Filter LifeRe-Certification Initial CertificationFormaldehyde only Ammonia onlyMotorized Impeller Replacement Fluorescent Light ReplacementMotorized Impeller Replacement Speed Control Replacement Work Surfaces Chapter Accessorizing Modifying Your Filtered EnclosureAirflow Monitor Add appropriate Front Panel with cutout to mount DigitalExhaust Transition Kits for Ducting to Outside Remote Blowers Part DescriptionExhaust Dampers Accessory Filters Hepa FilterHepa Filter Bag-In/Bag-Out Bag Odor Control Carbon FilterUtility Shelf Kit Storage CabinetsAccessorizing and Modifying your Filtered Enclosure Problem Cause Corrective Action Chapter Troubleshooting Servicer Operating LOGTroubleshooting Problem Cause Corrective Action Date Comments Service Operating Record LogAppendix a Filtered Enclosure Components Replacement Parts Qty Part Number Description Qty Part Number Description Long Use for XPert System and XPert Station Use for XPert System, XPert Station, Digital Monitor and Bag Appendix B Dimensions Exhaust Options Figure B-1 XPert Filtered Balance System Figure B-2 XPert Filtered Balance Station Appendix B Dimensions and Exhaust Options Environmental Conditions Appendix C Filtered Enclosure SpecificationsAppendix C Filtered Enclosure Specifications Appendix C Filtered Enclosure Specifications Appendix C Filtered Enclosure Specifications Appendix C Filtered Enclosure Specifications Appendix C Filtered Enclosure Specifications Model Size Ppendix Uick Hart Iltered NclosuresNon-mandatory recommendations from Prudent Practices Appendix E References Nfpa 30 2000 Flammable and Combustible Liquids Code General References Laboratory Safety, Principles and Practices, American Page USA