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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 

 
 

 

Содержание Circulaire C550

Страница 1: ...C550 C650 AND C900 FILTRATION FUME CABINET OPERATING AND MAINTENANCE MANUAL ISSUE B July 2014 ...

Страница 2: ...2 ...

Страница 3: ...R LIFE 8 CARBON FILTER EFFICIENCIES 9 ABSORPTION CAPACITIES 9 SECTION 4 10 MAINTENANCE 10 FUSES 10 LIGHTING 10 CALIBRATION OF THE LOW AIRFLOW ALARM 10 CALIBRATION OF OPTIONAL FILTER CONDITION ALARM 11 SECTION 5 11 SERVICING 11 Warning This system must be used in compliance with these instructions and any repairs or maintenance carried out by qualified personnel For parts or service information ple...

Страница 4: ... 2001 for filtration fume cupboards Circulaire 550 Circulaire 650 Circulaire 900 External Dimensions 550mm Wide 600mm Deep 1120mm High 650mm Wide 600mm Deep 1120mm High 900mm Wide 600mm Deep 1120mm High Internal Dimensions 530mm Wide 550mm Deep 740mm High 630mm Wide 550mm Deep 740mm High 880mm Wide 550mm Deep 740mm High The cabinet must be positioned and used on a bench An optional stand or under ...

Страница 5: ...k the pre filter is in place by rotating the small plastic catches located inside the fume enclosure which will allow the pre filter retaining grille to be lowered Connect the cabinet to a 13A outlet socket TESTING COMMISSIONING An airflow test certificate will be supplied for conformity to CE marking and electrical test THE CABINET MUST BE TESTED EVERY 14 MONTHS TO COMPLY WITH C O S H H REGULATIO...

Страница 6: ...rops below a safe level there will be an audible alarm and the LCD screen on the control panel will flash red CONTROL PANEL With Airflow Monitoring For models fitted with an optional carbon filter condition monitor the exhaust air is also continuously monitored An audible and visual alarm will be provided if filter breakthrough is detected CONTROL PANEL With Airflow Monitoring and Filter Condition...

Страница 7: ...fic for information if required The cabinet should be turned off whilst changing the main carbon filter and the mains cable un plugged Remove the pre filter see pre filter changing procedure above Disconnect the airflow sensor plug from the back of the cabinet From inside the fume enclosure remove the four M5 nuts securing the fan filter module Lift the fan filter module off the fume enclosure to ...

Страница 8: ...emicals AC Activated Carbon Hydrocarbons Alcohols Hydrocarbons General use ACID Acid gasses So2 HCL H2So4 FORM Aldehydes Formalin Glutaraldehyde SUL Sulphur compounds H2S mercaptans AMM Ammonia NH3 NH4 ETHER Ethers SCHOOLS Educational Animal odours SO2 H2SO4 BR2 H2S NH3 CCL4 hydrocarbons All types of activated carbon have general use capability for hydrocarbons Other types are available for applic...

Страница 9: ... with a typical value of 30 for hydrocarbons The cabinet main filter has the following nominal absorption capacities Model Carbon Weight Hydrocarbon capacity at 30 absorption Circulaire C550 1 X 12Kg 3 6kg Circulaire C650 1 X 14Kg 4 2kg Circulaire C900 1 X 16Kg 4 9kg The given weight is approximate to standard activated carbon Impregnated carbons have higher densities and will increase filter weig...

Страница 10: ...carried out by a trained service engineer 1 Place the head of the anemometer in the centre of the aperture supported by a laboratory stand 2 Remove the black plastic hole plug from the left hand side of the fan module to gain access to the speed controller and reduce the fan speed to achieve a face velocity of 0 35m sec by rotating the potentiometer 3 Turn off the cabinet and restart whilst pressi...

Страница 11: ...he Mute button once The indicators will stop flashing with the green remaining on 5 The filter condition alarm is now calibrated SECTION 5 SERVICING An annual service is recommended and testing is mandatory under C O S H H regulations and will include the following points Check replace pre filter Check and record face velocity readings Check airflow monitor and re calibrate if necessary Check cond...

Страница 12: ...Monmouth Scientific Ltd Units 5 6 Kilnside East Quay Bridgwater Somerset TA6 4DB Email info monmouthscientific co uk 12 ...

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