FILTER SELECTION
It is most important that filters fitted are correct for the particular
application
.
A guide to filter selection is as follows:
Particulates – HEPA filters.
Monmouth Circulaire HEPA filters are 99.997% efficient for particulates greater
than 0.3 microns. Typical applications – Asbestos / powders
Gaseous fumes – Activated Carbon filters.
Standard activated carbon is suitable for a wide range of pollutants including
hydrocarbons. Activated carbon can be impregnated with various chemicals to
produce a range of filter types capable of neutralizing other contaminants.
Monmouth Circulaire Carbon Filters are available in the variant types listed
below, which offer improved efficiency and extended filter life.
Filter Type
Application
Typical Chemicals
AC
( Activated Carbon )
Hydrocarbons
Alcohols, Hydrocarbons,
General use
ACID
Acid gasses
So
2
, HCL, H
2
So
4
FORM
Aldehydes
Formalin Glutaraldehyde
SUL
Sulphur compounds
H
2
S, mercaptans
AMM
Ammonia
NH
3
, NH
4
ETHER
Ethers
SCHOOLS
Educational, Animal
odours
SO
2
, H
2
SO
4
, BR
2
, H
2
S,
NH
3
, CCL
4
, hydrocarbons
•
All types of activated carbon have general use capability for hydrocarbons.
•
Other types are available for applications not listed above.
Filters can be manufactured in layers suitable for more than one application.
To determine correct filter type please contact Monmouth Scientific with
details of your application, volumes, concentrations and temperatures etc.
MAXIMISING FILTER LIFE
•
Handle minimum volumes of chemicals
•
Minimise surface area of exposed chemicals to reduce evaporation rates
•
Cover containers as far as practical
•
Do not boil off large volumes of chemicals
•
Minimise use of heat
•
Acids should be at room temperature and covered as far as practical
8
