Maschinenbau
Werkzeuge
Laborgeräte
2
D-LE 255 S/D - 18.07.14 / Vers.: 1
2.2 Unpacking the single/double-workplace extraction unit
1.
Place the carton on a flat surface.
2.
Remove the top packaging material.
3.
Push the packaging material away from the unit. Grasp hold of the unit by the lower edge.
4.
The unit (weight = approx. 25 kg) should be lifted out of the carton by two persons.
5.
Check the accessories:
•
Documentation
•
Main power cable Item no. 35028
•
Ø 50mm extraction hose, 2m long with two Ø 50 mm connectors, Ø 50 mm extraction hose, 2m
long, Item no. 72050 Ø 50 mm connector, Item No. 72050 ....................................................
•
See the delivery note for further accessories
2.3 Short description of the unit and component identification
The single/double-workplace extraction unit D-LE 255 S/D has a powerful high-pressure fan which is
fitted with noise suppression. The unit provides two ways to set the airflow rate indicated for
the detection device (extraction mouth):
-
Gradually, by means of a pushbutton.
-
Continuously, by means of a potentiometer.
In both cases, the airflow rate is automatically controlled. Thus, the airflow volume at the extraction
funnel remains constant regardless of the contamination degree of the filter medium.
It is also equipped with an automatic electronic ignition, an automatic shut-off feature with filter
change indicator, and automatic air volume control. Pneumatic stop valves (accessory) are con-
nected and automatically actuated when the respective dust-generating device is activated, enabling
free airflow at the specified vacuum duct.
The automatic ignition electronics detect a rotating hand-held piece in a fraction of a second and im-
mediately actuate dust extraction. The connected stop valve (accessory) automatically enables the
extraction line immediately. Any commercially-available hand-held pieces can be used for this pur-
pose. The D-LE 255 S/D is also used as an extractor for sand blasting instruments, saws and other
dust-generating devices, electronic detection functioning here in the same manner.
The existing flow control device not only monitors the airflow but also the contamination degree of the
pre-filter and ultra-fine filter. Visual and acoustic indicators are provided to indicate the condition of fil-
ter components, as well as the decrease of the exhausted airflow volume at the extraction funnel be-
low a specified minimum value. If the airflow volume falls below the minimum, all dust-generating de-
vices connected to the extraction unit are shut down.
At specific time intervals but only after switch-on, the extraction unit performs a self-test and clears
the lines.
The extraction unit is designed for mains voltages of 200 - 240 (± 10%) V. That is, the air volume set
by the potentiometer is held constant regardless of line voltage fluctuations.
The dust is collected in a double-ply disposable filter bag with a capacity of up to 10 kg, depending on
the nature of the dust.
The ultra-fine filter has a large surface area and is serially connected to the disposable filter bag, has
a maximum transmittance of <0.1%.
