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1, high efficiency filter integrity
a) Run the fan and lamp of the safety cabinet, remove the diffuser and protective cover of the filter. An aerosol generator is placed to direct the aerosol into the safety cabinet to produce an evenly distributed high-efficiency filter upstream flow.
b) Turn on the aerosol photometer and adjust it; test the upstream airflow of the high efficiency filter containing aerosol, at least 20ug/LPAO.
c) The photometer probe moves no more than 25 mm from the filter surface downstream of the filter and moves at a scan rate of less than 50 mm/s, allowing the probe to sweep the entire downstream side of the filter and the edge of each combined filter, scanning the route Should overlap slightly.
2, noise
a) Open the fan and illuminator of the safety cabinet, and measure the noise at the center horizontal 300mm in front of the safety cabinet and 380mm above the work surface.
b) Turn off the fan and illuminator of the safety cabinet. If there is an outdoor exhaust fan, let it continue to run and measure the background noise at the same position.
3, illumination
a) On the work surface, the illuminance measurement points are set along the center line of the two inner side walls of the work surface. The distance between the measurement points is not more than 300mm, and the minimum distance from the side wall is 150mm.
b) Turn off the lights of the safety cabinet and measure the background illumination at the measurement point from one side. The average background illumination should be 110lx ± 50lx.
4, descending air flow rate
The position of the measuring point is determined above the working area above the horizontal surface of the front window operating edge of 100 mm, and the flow rate of the descending air flowing through the plane is measured at multiple points.
a) The measurement points are equidistantly distributed. The square grid formed is not more than 150mm × 150mm. The test points should have at least 3 rows, and each row should have at least 7 measurement points.
b) The distance between the test area boundary and the inner wall of the safety cabinet and the front window operation port shall be 150 mm.
5, inflow air flow rate
Measure the exhaust gas flow rate to determine the inflow air flow rate (suitable for Class II A1, A2 safety cabinets)
a) Use a thermal anemometer to measure the flow velocity through the exhaust filter surface at multiple points. The measuring point is a grid point of no more than 100mm × 100mm. The boundary point is 100mm from the edge of the filter. The distance between the measuring surface and the filter surface. About 100mm.
b) Calculate the average value of the exhaust flow rate at each measuring point, that is, the average exhaust flow rate (m/s), and the average exhaust flow rate multiplied by the exhaust area (m2) to obtain the exhaust flow rate (m3/s).
c) Exhaust flow rate (m3/s) In addition to the area of ​​the front window operation port (m2), the average inflow air flow rate (m/s) is obtained.
6, working window airflow mode
6.1 Downflow test
The smoke is along the centerline of the work surface at a height of 100 mm above the top of the front window operating port, from one end of the safety cabinet to the other.
6.2 observation window airflow test
The smoke is 25 mm behind the viewing screen and 150 mm above the top of the front window operating port from one end of the safety cabinet to the other.
6.3 front window operation port edge airflow test
The smoke passes around the entire front window operating opening approximately 38 mm outside the safety cabinet, paying particular attention to the corners and vertical edges.
7, the number of suspended particles, floating bacteria
The specific detection method is the same as the clean room comprehensive performance detection method.
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