Labconco Protector Work Stations 3930021 - Manual (Page 22)

Chapter 3: Getting Started
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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.
The Protector Work Station enclosures have been tested at Labconco’s airflow test
facility per ASHRAE 110-1995. (See Appendix E) All enclosures achieve an “as
manufactured rating” of less than 0.05 part per million (ppm) at 4 liters per minute
(lpm); AM <0.05 (Consult Labconco for individual ratings). For “field use”
ASHRAE testing contact Labconco for a certified on-site contractor. While no
enclosure can compensate for improper technique, these tests confirm that the
Protector Work Station enclosures provide a safe working environment.
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