A2 Disinfection - Heraeus HS 9 Service Manual

Service Instructions HERAsafe HS/12/18
A Decontamination
A2 Disinfection
CAUTION! – Highly flammable!
Paraformaldehyde is flammable. The auto-
ignition temperature of paraformaldehyde
is 300 °C (572 °F).
For evaporation, do not use heating devi-
ces reaching temperatures above 250 °C
(477 °F)!
CAUTION! – Hazardous chemicals!
Paraformaldehyde in reaction with hydro-
gen will form BCME which is a hazardous
chemical.
When using paraformaldehyde, all resi-
dues of hydrogen chloride in the work
chamber of the cabinet must be removed!
Installations for disinfection:
1. Switch the cabinet off using the Power/Function
Key switch; disconnect the two power supply ca-
bles from the mains supply and protect them
against accidental reconnection.
2. Remove the exhaust filter guard (see section 4.2).
3. Seal the exhaust opening [1] with plastic film or
with a plate using gas-tight tape.
4. Place the heating device [2] with the beaker in the
work chamber.
5. Set the heating device thermostat to 230°C (437 °F).
6. Fill the beaker with paraformaldehyde solution.
7. Connect the supply plug [3] of the heating device
to the cabinet-internal power supply and switch
the heating device on.
8. Connect the two power supply cables of the safety
cabinet to the mains supply and turn the unit on.
9. After 25% of the paraformaldehyde has evapo-
rated, turn on the cabinet blower for 10-15 sec-
onds. Repeat after 50%, 75%, and 100% of the
paraformaldehyde has evaporated.
10. Disconnect the power supply cable of the internal
outlet from the mains outlet.
11. Turn the safety cabinet off.
12. Allow the gas to react for approximately six hours.
13. Install the exhaust filter guard [1]
(see section 4.2).
Valid: 05.2001 / 50060091 / A
Figure A1
Fig. A1, Disinfection
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