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How can I tell when a biosafety cabinet HEPA filter needs to be replaced?
How can I tell when a biosafety cabinet HEPA filter needs to be replaced?I. With the extension of the use of the cycle, dust and bacteria accumulate in the filter will lead to an increase in the pressure loss of high-efficiency filters in biological safety cabinets, I hope that the user will be able to run the equipment in a clean air background environment, if the long-term operation of the poor quality air environment will lead to frequent replacement of high-efficiency filters, the equipment in the process of operation, if the equipment issued a sound and light alarm and is due to the decline in the airflow or the inflow of airflow flow rate caused by the low (see) The display window shows that the value is lower than the design requirements, which means that the filter blockage is very serious, the fan speed has reached its maximum value, and the system can not reach the specified air speed value no matter how to adjust, at this time, the filter must be replaced.II. Check the control panel on the cumulative running time of the fan, if it reaches 10,000 hours, usually needs to replace the filter, but not must be replaced, but also take into account the degree of cleanliness of the use of the environment, the use of habits, etc., recommend the first method to determine whether the need to replace the filter. Bio-safety cabinet high-efficiency filter replacement method is as follows: 1. Turn off the power switch to cut off the power supply line of the safety cabinet. 2. Pull out the front door and the box wiring socket, remove the front door, and put it flat. 3. After the operator has taken protective measures, remove the cover plate of the high-efficiency filter installation hole. 4. Remove the pressure plate of the high-efficiency filter. Remove the high-efficiency filter, and at the same time, put the waste high-efficiency filter into a plastic bag for preparation and seal the mouth for disposal. 5. Install the new high-efficiency filter as required, restore the accessories removed before, install the hanging door, and restore the power connection. 6. After the power is on, do the test about the filter, and use it only after meeting the requirements. 7. The above work should be completed by professionals. Special note: In the process of using the safety cabinet, care should be taken not to put soft, fine items (eg: soft tissue paper, sanitary cotton balls, etc.) on the work surface, so that they are not sucked into the negative air duct and fan by the return air grille on the table, affecting the operation of the equipment. Daily inspection should be carried out to ensure that the seal between the filter and the system is firm and leak-free. In the event of a leak, the screw caps should be moderately tightened with a spanner. Given that the filters may be filled with biohazardous substances, they should be replaced or repaired by a professional, and it is necessary to disinfect and clean the safety cabinet before replacement and/or repair. High-efficiency filter replacement, be sure to cabinet surface and the original ultra-high-efficiency filter using formaldehyde sterilization, replacement is best to let the use the presence of the experimenter (pre-questioning the bacteria used in the experiment), the hands and body trauma shall not be operated, the operator must wear a gas mask and rubber gloves, take out the filter should be immediately sealed into a plastic bag, and then put into a cardboard box, the use of the and utensils, gloves, also The used tools and gloves should also be processed and then burnt together. When installing the new filter, do not just stick your head and body into the cabinet, and also operate with high caution. |
