Abstract:
A fume extraction apparatus ( 1 ) which comprises an identifier module ( 20   a;    20   b ) capable of communicating a credential signal over an air interface, a receiver ( 31 ) for receiving the credential signal and validating the same, the identifier module attached to a removable filter unit ( 5; 6 ); and the receiver is secured to a body of the apparatus, which body removably receives the filter unit.

Description:
TECHNICAL FIELD The present invention relates to filter assemblies. 
     BACKGROUND 
       [0001]    In many industries such as electronics fabrication, laser marking/cutting/engraving and pharmaceuticals, extraction systems are used to capture hazardous particulate and gaseous/vaporised matter generated by industrial processes. 
         [0002]    Known fume extraction systems comprise multiple graded particulate filters and a gas filter (typically activated carbon based). Which are housed in a single unit, together with an extraction pump. The extraction pump draws contaminants and outputs filtered air into the working area. When saturated, the filters must be replaced. 
         [0003]    We have devised an improved filter unit. 
       SUMMARY 
       [0004]    According to a first aspect of the invention there is provided a fume extraction filtration apparatus which comprises: an identifier module capable of communicating a credential signal over an air-interface, a receiver for receiving the credential signal and validating the same, the identifier module attached to a removable filter unit, and the receiver is secured to a body of the apparatus, which body removably receives the filter unit. 
         [0005]    The receiver preferably comprises a signal processor. 
         [0006]    The receiver preferably comprises an aerial. 
         [0007]    Preferably the signal processor arranged to perform a validation process wherein the received credential signal is processed to determine whether it corresponds to an acceptable credential signal, and if it is determined that it is a valid credential signal, the apparatus is allowed to be activated, and if the credential signal is determined to be invalid, the apparatus is prevented from being activated. 
         [0008]    Preferably the signal processor is arranged not to allow the apparatus to be activated unless a valid credential signal is received. 
         [0009]    Preferably the identifier module comprises a radio frequency identification device. 
         [0010]    Preferably the filtration apparatus is arranged to extract particulate or hazardous gasses/vapour from air. 
         [0011]    Preferably, the identifier module is preferably arranged to be tamper proof such that attempted removal of the module from a filter unit to which it is attached causes the module to be non-functional. 
         [0012]    Preferably the filtration apparatus comprises an air extraction pump. 
         [0013]    A further aspect of the invention relates to a filter unit for a fume extraction apparatus, which unit comprises an identifier module which is capable of communicating a credential signal. 
         [0014]    Further features and/or aspects of the invention may relate to one or more features in the description and/or shown in the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0015]    One embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing,  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    With reference to  FIG. 1 , there is shown a fume extraction filtration apparatus  1 . The apparatus  1  comprises a housing  2  which removably receives a first filtration unit  5  and a second filtration unit  6 . The apparatus  1  further comprises an extraction pump  10 , an inlet  11  and an outlet  12 . The extraction pump  10  is arranged to draw air through the inlet  11  and through the first and second filter units. 
         [0017]    Each filter unit  5  and  6  comprises a radio frequency identification module or tag referenced  20   a  and  20   b  respectively. Each tag  20  is arranged to communicate a credential signal which is indicative of a valid code to allow operational activation of the filter apparatus. 
         [0018]    Each of the filter units is arranged to be removably insertable into the fume extraction housing  2 . The housing  2  may comprise a rigid cabinet in which is provided a space to removably receive and accommodate the filter units. The housing  2  comprises support components, arranged to support each filter unit. 
         [0019]    In use, when the pump  10  is activated contaminated air is drawn through the fume conduit and directly into the chamber  2 . The filter  5  may be considered as a pre-filter which protects the downstream High-Efficiency Particulate air (HEPA) filter  6 . 
         [0020]    The apparatus  1  is arranged to reduce the risks associated with processes that produce hazardous particular and/or gases/vapours (fume). Because the air carrying the fume is returned back into the workplace the integrity of the filters is paramount. The above embodiment ensures that only filters meeting a required quality standard are installed, and are capable of being used for operation. For example if non-genuine filter units are installed, no valid credential is sensed, and the apparatus  1  is prevented from being operated. This prevents non-genuine filter units from being used which may not necessarily meet a required standard. 
         [0021]    Advantageously, a particular credential code can be used for operation. For example, if non-genuine filter units are installed, no valid credential is sensed, and the apparatus  1  is prevented from being operated. 
         [0022]    Advantageously, a particular credential code can be used for particular customers or particular applications, thus ensuring that the correct type/combination of filters is used. This provides confidence to original equipment manufactures (OEM) customers that the extractor apparatus that they are supplying to control the hazards generated by their equipment (for example lasers) will be effective. 
         [0023]    A further important advantage of the apparatus is that if no filter unit is installed, or an insufficient number of filters are installed, in the absence of receipt of a valid credential code, the apparatus cannot be operationally activated. This has very significant safety implications. 
         [0024]    In use, the apparatus operates as follows. A control unit  30  system of the apparatus comprises a data processor, a memory and a user interface. The user interface allows an operator to control the operation of the apparatus by way of manual input. The memory is arranged to store one or more valid credential/validation codes, and the data processor arranged to compare a sensed credential code with a code received from a tag secured to a filter unit by an aerial. If the sensed credential code is the same as that stored in the memory, the data processor is operative to issue an output which is indicative of allowing the apparatus to be operationally activated. Typically, the sequence of events is as follows. The operator selects a button or similar to provide an input that it is desired for the apparatus to be activated. On receiving the signal, the data processor then performs the above comparison operation to determine whether the request for the apparatus to be activated can be actioned. If the result of the comparison step is positive i.e. there is identity, then a signal can be issued by the data processor to cause the apparatus to be capable of being activated.