Automatic Formaldehyde and Ammonia Evaporator

The evaporator

Application of Automatic Formaldehyde and Ammonia Evaporator

Disinfection of the  microbiological safety cabinets with formaldehyde vapors after operations with pathogenic biological agents (PBS) hazardous to the human health in following cases: 

  • before any practices of technical service (when access to potentially contaminated parts is necessary);
  • before verification of HEPA filters’ integrity;
  • before changing the НЕРА filters;
  • when eliminating accident consequences connected to spillage/splashing of liquids containing hazardous PBA and microorganisms inside the cabinet’s work chamber (when suspected their appearance on the HEPA filter, inside the hidden hollows and on the inaccessible surfaces of the cabinet);
  • before salvaging the cabinet;
  • in some cases when changing the type of activity in the cabinet.

Functioning of Automatic Formaldehyde and Ammonia Evaporator

Essence of the method is lengthy (not less than 6 hrs) exposure of the cabinet leak-tightly isolated from external environment to the formaldehyde vapors (НСНО) with high humidity level in order to kill microorganisms and spores. After that formaldehyde vapors are neutralized with ammonia vapors (NH3). 

Evaporator is placed inside the cabinet’s work chamber; appropriate amounts of reagents are placed into evaporator’s storage tanks; appropriate time limits of exposure are entered to evaporator’s control system; after that the cabinet is sealed with special tools or with air-tight bag from the external environment. Evaporator is activated inside the cabinet and the process continues automatically. 

To achieve high humidity with formaldehyde vapors, formalin solution (37%) is evaporated with an equal amount of water. 

To generate ammonia vapors, aqueous ammonia solution (25%) is evaporated.  


Main features of Automatic Formaldehyde and Ammonia Evaporator

  • evaporator’ casing and reagents’ tanks are made of stainless steel;
  • reagents’ tanks are provided with screw on caps;
  • control unit is leak-tight isolated from evaporation unit and from environment;
  • control unit is supplied with an LC Display, keyboard and additional led indicators;
  • evaporator is supplied with folding handle for transportation convenience;
  • power cable is incorporated in the evaporator’s case. 

Main parameters and characteristics of evaporator  

Product code
Dimensions of the evaporator, mm (WхLхH) 198х156х278
Dimensions of the evaporator with a handle lifted, mm (WхLхH) 198х156х348
Volume of the formaldehyde tank, cm3 800
Volume of the ammonia tank, cm3 320

Power supply of the evaporator:

- voltage, V~

- frequency, Hz




Input power, W, not more than 200
Mass of the evaporator (dry), kg, not more than 5,3



Main characteristics of evaporator  

Maximum volume can be treated, m3 6

Reagents’ evaporation time for treatment of 1 m3:

- formaldehyde (37%) with water, min

-ammonia (25%), min




Reagents’ evaporation time for treatment of 6 m3:

- formaldehyde (37%) with water, min

-ammonia (25%), min




Maximum heat temperature during reagents’ evaporation, 0 С ≈ 40




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