Operating Limitations - BRAND Dispensette III Instrucciones De Manejo

Functions and Limitations of Use
Limitations of Use
This instrument is designed for dispensing liquids,
observing the following physical limits:
– use temperature from +15 °C to +40 °C (from
59 °F to 104 °F) of instrument and reagent
– vapor pressure up to max. 600 mbar. Aspirate
slowly above 300 mbar, in order to prevent the
liquid from boiling.
– kinematic viscosity up to 500 mm
(dynamic viscosity [mPas] =
kinematic viscosity [mm²/s] x density [g/cm³])
– Density: Dispensette
Organic: up to 2.2 g/cm
Operating Exclusions
Dispensette III never use with:
®
– liquids attacking Al
and PTFE (e.g., dissolved sodium azide*)
– liquids attacking borosilicate glass (e.g.,
hydrofluoric acid)
– liquids which are decomposed catalytically
by platinum-iridium (e.g., H
– hydrochloric acid > 20 % and nitric acid > 30 %
– tetrahydrofuran
– trifluoroacetic acid
– explosive liquids (e.g., carbon disulfide)
– suspensions (e.g., of charcoal) as solid particles
may clog or damage the instrument
– liquids attacking PP (screw cap)**
* Dissolved sodium azide permitted up to a
concentration of max. 0.1%.
** When stronger chemical resistance is needed,
use the PTFE screw caps. (Accessories
page 54)
34
/s
2
III / Dispensette
® ®
3
O -ceramic, ETFE, FEP, PFA
2 3
O )
2 2

Operating Limitations

Liquids, which form deposits may make the piston
difficult to move or may cause jamming
(e.g., crystallizing solutions or concentrated alka-
line solutions). If the piston becomes difficult to
move, the instrument should be cleaned immedi-
ately (page 48).
When dispensing inflammable media, make sure
to avoid to buildup of static charge, e.g., do not
dispense into plastic vessels; do not wipe instru-
ments with a dry cloth.
The Dispensette is designed for general labora-
®
tory applications and complies with the relevant
standards, e.g. DIN EN ISO 8655. Compatibility of
the instrument for a specific application (e.g., trace
material analysis, food sector etc.) must be checked
by the user. Approvals for specific applications, e.g.
for production and administration of food, pharma-
ceuticals and cosmetics are not available.
Dispensette Organic never use with:
®
– liquids attacking Al O
2
FEP, PFA and PTFE (e.g., dissolved sodium
azide*)
– liquids attacking borosilicate glass (e.g.,
hydrofluoric acid)
– bases and saline solutions
– explosive liquids (e.g., carbon disulfide)
– suspensions (e.g., of charcoal) as solid particles
may clog or damage the instrument
– liquids attacking PP (screw cap)**
-ceramic, tantalum, ETFE,
3