一、General description
Determination of instrument the KJ-20Y electronic aperture is according to the standard EN868-3 developed the test principle and measuring principle of the design of manufacturing electronic measuring instruments. Have tested principle is based on the principle of capillary action, as long as the measured air is forced through a liquid wetting of the material measured pore, and make the air ejected from the maximum pore liquid, pore emerge first bubble in the required pressure, the use of known the measuring temperature of liquid surface tension, the application of capillary equation can be calculated in the large pore size and average pore diameter, the instrument has the advantages of small volume, weight light, easy to move, the use of advanced electronic technology and parameters can be set in advance, large liquid crystal display pressure value and automatic calculation to the aperture value, each step operation interface text prompts, the operation is simple. Through the printer to print out each test piece of numerical aperture and a set of test piece of the average value of each test piece and not more than 10, the product mainly applies to medicine with determination of maximum pore size of filter paper.     
二、Specification
1、Air pressure: 0-20kpa
2、Pressure speed:2-2.5kpa/min
3、LCD display: 240128 dot matrix
4、The pressure value accuracy:±1%
5、Pressure resolution: 0.01kpa
6、Aperture resolution: 0.01μm 
7、Specimen thickness: 0.10-3.5mm
8、Test area: 19.6± 30.2c㎡  
9、Clamp ring diameter: diameter of 50 + 0.5mm
10、Gas cylinder volume: 2.5L
11、Instrument size (length * width* height): 275 x 440 x 315
12、Power supply: 220V AC