Assessments - 3, GPA: 5 ( )

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HEPA Carbon Carbon Carbon Important: Carbon filters do not provide any particulate protection, but provide odor control. Connecting the Electrical SupplySource to the Filtered Enclosure 115V Models Simply connect the 115V power cord supplied to the IEC electrical supply plug on the back of the enclosure. If using at 50 Hz operations, blower performance maximum airflow will be reduced by 17%. For the remote blower used for XPert Stations, follow the wiring diagram in Appendix C and wire the blower wires in the electrical junction box located behind the front panel. These wires are switched by the electrical relay via the blower switch. XPert System XPert Station 19 Chapter 3: Getting Started The maximum circuit load for the electrical relay is 6 amps. Only the remote blower wiring is connected inside the electrical junction box. The lights and airflow monitor are powered from a standard duplex electrical receptacle located nearby for connecting the power cord. All wiring for the XPert Filtered Balance Station should be performed by a licensed electrician and conform to local codes. In most cases, the XPert Filtered Balance Station will require the use of shielded conduit to protect the wiring. See Figure 3-4. The grounding connection shall not be made to the terminal box cover. The building electrical supply system for the remote blower should include overload protection such as a switch or circuit breaker in close proximity and within easy reach of the operator. The switch or circuit breaker shall be marked as the disconnecting device. Consult NEC-2002 for proper installation. Figure 3-4 XPert Filtered Balance Station Conduit Location for Wiring External Remote Blower. 20 Chapter 3: Getting Started 230V Models The same procedure applies for the 230V except it is shipped without a plug. Install the appropriate plug for your electrical specifications per local codes. Set the Face Velocity with the Speed Control Adjustment For XPert Filtered Balance Systems, adjustment of the speed control gives the correct face velocity and is located behind the front panel. The face velocity should be adjusted from 60 to 100 fpm for weighing operations. (Consult your Safety Officer for airflow recommendations for your application). Containment is maximized at a setting within this range. Working at the lowest face velocity appropriate for the application will give the quietest operation. Face velocity measurements are made using an anemometer. An electric anemometer can be obtained from your laboratory supply dealer. Face velocity measurements should be taken in accordance with the Industrial Ventilation Manual. Using a small Phillips screwdriver, adjust the speed control to give the required face velocity. See Figures 6-1 and 6-2 in Chapter 6 to locate the speed control. The face velocity is increased by turning the speed control counter clockwise and clockwise to decreas...

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