Filter integrity tester

Characteristics and advantages of filter integrity tester:
1. Adopting a standardized automatic filter material infiltration program: Through a standardized automatic filter material infiltration program, the filter material is completely immersed in liquid, and subsequent testing work is initiated without affecting the downstream sterile state, meeting the requirements of online testing.
2. Advanced data processing technology: Adopting advanced artificial intelligence technology, real-time collection of constantly changing apparent diffusion flow data flow is used to analyze and identify diffusion flow and viscous flow patterns, accurately identifying the bubble point value of the filter element. The test results of the filter membrane/filter element bubble point have better correlation with the real bacterial interception performance.
3 ultra large capacity data storage functions, capable of storing 500 sets of test results and their test curves.
Our IntegtestTM V4.0 fully automatic filter integrity tester is currently the only testing instrument in China that can obtain the actual diffusion flow by measuring the upstream volume of the filter.
Due to the use of advanced algorithms and filtering methods, the instrument has achieved stability and reliability comparable to foreign detectors, solving the common problem of instrument instability in China. The air intake unit of the instrument adopts fully automatic digital control, greatly increasing the stability of the detection process and completely eliminating the original method of requiring professional personnel from domestic manufacturers to adjust the air intake knob to control the air intake speed.
6 can achieve integrity detection of large capacity filters. Our testing equipment is specially designed for the integrity of large capacity filters, ensuring that the measurement accuracy will not decrease when measuring multi-core filters.
The core components of the 7 instruments are all imported parts, and the safety of use has been carefully analyzed during the design process. On the premise of ensuring basic electrical and mechanical safety, safety measures have been taken for all aspects of the operation process.
Application scope:
Disc membrane: various types of membranes ranging from 25mm to 300mm in diameter
Standard cartridge: 2.5 "to 40", 1 core to 15 cores
Capsule filter cartridge
Mini cartridge filter
Air filter detection from 2.5 inches to 40 inches

Performance parameters:
Power requirements/power 170-240V AC, 50/60Hz; 110W
Z large operating pressure 9999 mbar
Z low intake pressure 3000 mbar
Dimensions: 240 (width) x 380 (depth 1) x 280 (depth 2) x 220 (height)
Test Range Z: Large Test Pressure: 500-6000mbar; Bubble point: 500-6000 mbar;
Pressure holding range: 0-6000 mbar; Diffusion flow: 0-2000ml/min; Water immersion: 0-50ml/min
Test accuracy net volume test: ± 4%; Bubble point: ± 50mbar; Diffusion flow: ± 4%; Water immersion method: ± 0.1ml
Operating conditions: Environmental temperature:+5 ℃~+35 ℃; Relative humidity: 10-80%
Test time: Net volume test: 5 minutes ± 2 minutes; Diffusion flow test: 8 minutes ± 2 minutes;
Simple bubble point test: 10 minutes ± 2 minutes; Enhanced bubble point test: 20 minutes ± 2 minutes;
Water immersion test: (set test time+5 minutes) ± 2 minutes;
Printing function: wide line Chinese printing, outputting test parameters, test results, and automatic printing function
500 sets of test results (including test curves) for the history recording function
Display screen size: 5.7 "TFT; monochrome
Serial port connection method: RS232;
Language options: Chinese

Appendix: Principle of Water Intrusion Membrane Integrity Test (WIT Method)
In 1992, Sartoris proposed a method for online integrity testing of hydrophobic filters, called WIT. WIT measures the rate of decrease in air pressure upstream of a submerged hydrophobic filter using water as the medium.
WIT is tested using water as the medium, and the applied pressure must be sufficient to overcome the capillary pressure in the membrane pores in order for water to freely flow through the hydrophobic microporous membrane pores. This initial critical pressure is called the "water breakthrough point pressure (WPP)", which is determined by the material and hydrophobicity of the filtration membrane and is inversely proportional to the membrane pore size.
During WIT testing, the hydrophobic filter installed on the filter housing is submerged in water upstream. Under the test pressure less than the critical pressure WPP, water cannot pass through the membrane and can only penetrate into the membrane substrate, with water preferentially entering the membrane pores larger than Z. The water immersed in the membrane substrate will not mix with the water phase passing through the membrane. Immersion is an extremely slow process, and in order to obtain water at the downstream end, pressure needs to be maintained for a long time. When conducting WIT, water is injected into the filter with a filter element from upstream, so that a section of air is sealed inside the filter housing by a water column. During testing, water infiltrates or penetrates the membrane under the pressure of the test, reducing the volume and increasing the volume of air, resulting in a decrease in pressure. The fully automatic integrity tester detects the air pressure drop corresponding to the volume of water immersed in the membrane hole. Therefore, measuring the pressure drop of the air upstream of the filter within a specified time can determine the integrity of the filter. There is an empirical value correspondence between WIT method and microbial challenge test, and it has been certified by international authoritative institutions.
Operation sequence of water intrusion method membrane integrity testing (WIT method)
1. Fill the upstream of the hydrophobic filter with water
2. Close all upstream valves
3. Connection integrity tester - IntegtestTM v4.0
4. Startup test: The tester automatically performs WIT testing
5. Print the test results at the same time as completing the test
6. Open the drain valve at the bottom of the filter housing and completely drain the water from the filter housing
7. Open the air inlet and drain valve of the filter housing to introduce compressed air
8. Start the filtering operation of the filtering system