MBRAUN LABmaster pro sp - Examples of a Rough Classification

3 Safety
Process materials
MB-20-G/MB-200G-W_MB-LABmaster_MB-200 MOD_TP700
Operating Manual - V5.0 - 04/2018 - STD
Page
3 - 9
If flammable gases are released inside the box and the resulting mixture has a concentra-
tion level which would allow ignition in contact with air, a secure zone shift must be avail-
able inside the box. Safe box operation must be maintained by keeping the oxygen con-
centration < 2% in the box atmosphere even in case of malfunctions.
The following system modifications and safety features are required:
Safety measure step MBRAUN item no.
1 - 6 All of MB-HC-II and MB-HC-III
7 ¡ Safe oxygen measurement with self-check and
secure box-purge feature in case of a failure.
¡ An upgrade of all pressure sensors to the "EX
model" version.
¡ An upgrade of the glove feedthroughs to elec-
trostatic dissipative types.
1507306
3.8.3 Examples of a rough classification
The following table shows how substances can be divided roughly into hazard classes,
using exposure limits and H- and P-signs. The table does not take into account the quant-
ity of substances in the system, the material’s condition, and the contact time with a re-
active partner.
Overview of hazard classes and acceptable limits of exposure
1
Pictogram Class Acceptable limits of
exposure (µg/m
3
dust / ppm vapour)
Typical H-statements
Hazard class MB-
HC-0
General ventilation
1,000 – 10,000 µg/
m
3
50 – 500 ppm
H319, H315, H317
Hazard classMB-
HC-I
Low and "normal"
hazard
100 – 1,000 µg/ m
3
5 - 50 ppm
H332, H312, H302
(not in combination
with H317)