Labconco Protector 3930000 User Manual page 22

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.
Do not use any detachable power cord that is not
!
adequately rated for the unit.
Ne pas utliser un fil électrique amovible qui n'est pas du
tension nominale de l'appareil.
Set the Face Velocity with the Speed
Control Adjustment
For Protector Work Stations with integral blower, adjustment of the speed
control gives the correct face velocity and is located behind the upper light
control panel. The face velocity should be adjusted from 60 to 100 fpm.
(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. (See Appendix E)
Using a small Phillips screwdriver, adjust the speed control to give the
required face velocity. See Figure 3-4 to locate the speed control. The
face velocity is increased by turning the speed control counter clockwise
and clockwise to decrease face velocity.
Validating the Protector Work Station
Enclosure
To determine the actual face velocity at the sash opening, airflow velocity
readings are taken. This should be done across the sash opening of the
enclosure in accordance with the Industrial Ventilation Manual. (See
Appendix E) The "average face velocity" is achieved by taking readings in
two rows across the enclosure with the readings 6" from the ends and
evenly spaced every 12"; the first row is 3" down from the upper sash foil
and the second row is 3" up from the work surface. A total of eight
readings are taken for the 4' enclosure and then averaged. Refer to
Chapter 2 for proper airflow volumes for your particular model.
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