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CARBON FILTER EFFICIENCIES 
 

Typical filter efficiencies are >99% and this efficiency is maintained for most of 
the filter life. 
 
Filters should be changed when efficiency has reduced to below 90%. 
 
 
 

ABSORPTION CAPACITIES 
 

Monmouth Circulaire cabinets are fitted with very large capacity filters, 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 weight. 
 
 

Contact Monmouth Scientific for absorption capacities for different 
applications.

 

Summary of Contents for Circulaire C550

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

Page 2: ...2 ...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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 ...

Page 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...

Page 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...

Page 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...

Page 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...

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

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