INSTRUCTION MANUAL
CODE 80158 REV E
02/2021
Page: 23
J
.P. SELECTA s.a.u.
Autovía A2 Km 585.1 Abrera 08630 (Barcelona) España
Tel 34 93 770 08 77 Fax 34 93 770 23 62
e-mail: [email protected] - website: http://www.grupo-selecta.com
- Place all the equipment on an appropriate construction (table, bench, ...) to
the weight of it.
- Remote or isolated from the presence of personnel.
- Need several outlets.
Details for fume extraction:
1. Kjeldahl digestion generates highly corrosive acid fumes and irritating to
humans and animals. They are not toxic.
2. Although means for extracting fumes are installed, it should be set in an
isolated area of the laboratory.
3. Avoid unnecessary exposure to fumes.
4. If installed in a fume hood, this must be constructed of suitable materials,
plastics, glass, ...
5. The draw-fumes with a jet vacuum pump may be sufficient, but within an
enclosed with external ventilation. Its effectiveness depend on the actions of
the vacuum tube. A water tap (with a minimum pressure of approximately 2.5
bar) and a drainage are needed.
6. Fumes extraction with a scrubber unit or two and a vacuum pump water
circulationis recommended. It can be done without hoods or booths.
7. For MACRO 20 places systems, it is recommended installing two Scrubber
units both connected to the two vacuum inputs.
Vacuum pump for the absorption of fume.
NaOH
Ø12x17
Ø10x14
Ø7x10
Reduction
Ø10x14
10gr
Na
2
CO
3
600ml water
+
150gr Na
2
CO
3
10gr
Na
2
CO
3
2x 600ml water +150g Na
2
CO
3
MACRO 20 p
“Scrubber” unit 4001611
Assembly with fume extraction by
vacuum tube (Its effectiveness depen
on the vacuum tube).
INSTRUCTION MANUAL CODE 80158 REV B 12/04/2011
(It can be modified without notice)
Page: 14
J.P. SELECTA s.a.
Autovía A-2 Km 585.1 Abrera 08630 (Barcelona) España
Tel 34 937 700 877 Fax 34 937 702 362
e-mail: [email protected] - website: http://www.jpselecta.es
MANTENIMIENTO
Antes de quitar la tapa del equipo, desconectarlo
de la red eléctrica.
La placa de control sólo debe ser manipulada por
personal de mantenimiento debidamente autori-
zado.
LIMPIEZA:
Para la limpieza de las diferentes piezas de los apara-
tos, recomendamos los siguientes productos:
MAINTENANCE
Before removing the cover, disconnect the
equipment from the mains.
The control board could only be manipulated by
duly authorized maintenance people.
CLEANING:
For cleaning the equipment, we recommend the use of
the following products:
7. Pulsar START «7», si se usa la trompa de vacío
para la extracción de humos y abrir el grifo.
8. Poner las tapas laterales en las aberturas de la
gradilla, ajustando el tornillo en el agujero de la gra-
dilla.
9. Una vez efectuada la digestión, sacar con cuidado
los tubos junto con la gradilla y extractor de hu-
mos, y depositarlos en el soporte de la gradilla.
10. Cuando las muestras se hayan enfriado lo suficien-
te, aproximadamente 15 minutos, sacar el extractor
de humos, depositándolo en su soporte y diluir las
muestras con agua destilada (normalmente 25 ml).
Mezcle bien, usando guantes resistentes al calor
para su protección. Se puede acelerar el enfriamien-
to de los tubos soplando aire frío con un pequeño
ventilador. Si la muestra está demasiado caliente,
al agregar agua, la reacción es demasiado violenta
y se puede perder muestra. Si por el contrario, está
demasiado fría, se pueden precipitar sales que son
difíciles de disolver nuevamente (las solidificaciones
deben ser evitadas, pero si ocurren coloque de nue-
vo el tubo en el bloque calentador por un breve mo-
mento).
11. Dejar enfriar los tubos antes de la destilación.
7.- Press START “7”, if you use a vacuum pump for
fumes extraction and open the water tap.
8.- Put the end caps on the rack openings, adjusting
the screw in the rack.
9.- Once the digestion has finished, carefully take out
the tubes with the rack and fume exhaust assem-
bly, leaving them in the rack stand.
10- When the samples are cool enough, around 15
minutes, take out the fume exhaust assembly,
place it on its support and dilute the samples with
distilled water (normally 25 ml). Mix well, using heat-
resistant gloves for your protection. The tubes
cooling can be accelerated by blowing cold air with
a small fan. If the sample is too hot, we could
have a violent reaction when adding water and some
sample may be lost. On the other hand, if it is too
cold, salts can be precipitated and this will be
difficult to dissolve (solidifications must be avoided,
but if this occurs, place the tube in the heater block
again for a short time).
11- Leave tubes to cool down before distilling.
