Beijing Zetron Technology Co., Ltd CN

High Efficiency Filter Leak Detection System Play An Important Role in Cleanroom

Source: Beijing Zetron Technology Co., Ltd Popularity:230 Time:2022/09/26 17:57:34 small middle big

About high efficiency filter leak detection: For food and drug manufacturers, high efficiency filter leak detection refers to the on-site leak detection after the installation of high efficiency filter and its system, mainly to check the small pinholes and other damages in the filter material, such as frame seal, gasket seal and leaky seams on the filter frame. The purpose of leak detection is to check the sealing of the high efficiency filter and its connection parts with the installation frame, find the defects in the high efficiency filter itself and in the installation in time, and take corresponding remedial measures to ensure the cleanliness of the area. Whether there is leakage. The purpose of dust generation is that the dust concentration upstream of the high efficiency filter is low, so if a particle counter is used to detect the leak without dust generation, it is difficult to detect the leak, and additional dust generation is needed to obviously and easily detect the leak.


FED-STD-209E, Par. 50 Federal Standard (Cleanroom and Workstation Requirements)

AACC, CS- 1T American Association for Contamination Control (Standard for High Efficiency Filters)

AACC, CS-2T American Society for Contamination Control (Laminar Flow Clean Air Installation)

AACC, CS-6T American Society for Contamination Control (Clean Room Testing and Certification)

IES, RP-CC-001-3 Institute of Environmental Science (High Efficiency Filters)

IES, RP-CC-002-86 Association for Environmental Science (Recommended Approach for Laminar Flow Clean Air Installations)

IES, RP-CC-001-2 Environmental Science Society (Test Clean Room)

NSF, STD No.49- 1992 National Sanitation Foundation (Secondary Laminar Flow Biological Safety Cabinet)

ANSI, N101.1-1972 American National Standards Institute (Efficiency testing of air cleaning systems with filters)

ANSI/ASME, N5101.198 American National Standards Institute/American Society of Mechanical Engineers (Testing of Nuclear Air Cleaning Systems) NEBB National Environmental Balance Agency (Standard for Clean Room Certification Test Procedures)

Product Information 

1.Aerosol photometer PM-350


The host adopts 5-inch color touch screen, easy to operate and faster data processing

* Intuitive display of leakage rate and pump sampling speed and other data

* Portable scanning probe, 3.5-inch color display, one-touch operation, synchronous display with the host interface, convenient for users to observe the test results

* Automatic switching upstream and downstream

* To ensure reliable and stable data, imported air pump and light source are used



Data display range 

0.0001%-100.0% Multi-color LCD display

Dynamic range



1%( 0.01% to 100%)

Flow control



When the preset limit value is exceeded, 2 modes of audible and visual alarm can be selected

Aerosol type

 PAO, DOP, DEHS and other multi-dispersion




AC 220V  50/60Hz





2. Aerosol generator HRF-4B (cold)


* Laskin Nozzle dust production method

* Adjustable manually

* Large capacity loading dust production


Airborne suspended particle output 

range 50 - 8,100 cubic feet per minute (1.4 - 229 m3min)

Suspended Particle Concentration 

100 µg/L at 810 cfm flow rate

Suspended Particle Concentration 

10 µg/L at 8100 cfm flow rate

Generation type

1 to 7 Laskin nozzles

Compressed air

3 to 18 cubic feet per minute at 20 psi flow

Particle generation



 Multiple particle diameters (cold)


25cm(L)X 28cm(W)X23cm(H

3. Aerosol generator HRF-5C (Hot)


HRF-5C is a more user-friendly enhanced aerosol generator, its oil circuit insurance supply system and thermal cut function in the current market belongs to the higher grade of the security system, suitable for certification, HEPA performance test and installation. Need to use inert gas, suitable for AC220v±10%50HZ power supply.



Usable flow rate range 


Occurrence concentration

10ug/L:flow rate65,000cfm( at approx 1839.5m3/min)

100ug/L:flow rate 6,500cfm(at approx183.95m3/min)

Particle generation


Generation method 

Heating generation

Compressed gas (inert) 

Nitrogen,Argon,Carbon Dioxide或Helium (50psi))

Power supply






When applying a pressure of 20psi (0.14Mpa) Note: DOP is not recommended


4.Aerosol generator performance comparison table








Cold generation

Hot generation

Gas source 

Compressed air 

Inert gas

Gas source pressure 









Note: Heating occurs when oily particles are heated and evaporated and then blown into the system air inlet by inert gas, suitable for the end of the whole air conditioning system for high efficiency filter detection, the advantage is that the whole system only needs a place to produce dust , after the filter upstream concentration is stable, you can test the filters one by one, reducing the time of frequent change of dust production points and debugging dust concentration, also saves the PAO oil for debugging. The disadvantage is that there should be a long section of mixed cold generation ten times the diameter of the air duct, which is not suitable for local FFU units without air supply duct at the top, and not suitable for single biosafety cabinets and clean benches.

Cold generation is made of compressed air and pressurized PAO oil, which is sprayed by Laskin nozzles, and the working number of nozzles is used to adjust the size of dust concentration, which is suitable for local FFU units and clean benches of biosafety cabinets without air supply ducts. There is no thermal occurrence of the convenience, there are also air conditioning systems because of the inconvenience of segmentation detection, and can not use this type of dust generation small amount of dust generation instrument.


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