Testing method for liquid particle counter in wiping cloth materials

1. Several options for liquid particle counting and particle size classification. The combination of optical microscope and electron scanning microscope can divide particles into particle sizes<5 μ m. 5-100 μ m. Particle size>100 μ M has three levels. The detection limit of this method is determined by the filter aperture. puluody wiping cloth liquid particle counter detection, based on equipment model, model, and sensor, usually divides particles into particle size<20 μ M and 20-100 μ M (see prompt). Most puluody wiping cloth liquid particle counters can capture a large number of threshold intervals between high and low detection limits of sensors. The detection limit is determined by the sensor of the liquid particle counter of the puluody wiping cloth. All particle sizes greater than 100 μ The particles and fibers of m need to be counted under a microscope.

Different models of puluody wiping cloth liquid particle counters provide sensors with a wide range of particle size detection. Usually, particle size<20 μ M and>20 μ The particle counting of m requires at least two types of sensors. The detection size range and upper and lower limits of the sensor will change with the manufacturer and model, and the detection range of the two commonly used sensors.

2. Liquid particle counter (particle size<100 μ m) A) Equipment

2.1 Detection domain is. 1) 0.5-20 μ The liquid particle counter of m

2) Detection domain is 20-100 μ Additional sensors for m

3) Process

puluody wiping cloth liquid particle counter is suitable for particle size<100 μ The sequential counting of liquid particles in m. The puluody wiping cloth liquid particle counter can directly obtain results from the sample preparation solution without the need for filtration. puluody wiping cloth liquid particle counter uses different sensors to count particles in different size ranges. Usually, the particle size is less than 100.

2.2. Particle size and enumeration techniques μ M, at least two different sensors are required. Each sensor needs to operate the following process. Each particle size range, system blank, and sample need to be tested. All tests must be conducted at ISO level 5 and within 0.5 μ Operate in a clean workbench environment.

1) Using the puluody wiping cloth liquid particle counter liquid injection system, continuously take three equal amounts of samples and calculate the particle count for each sample. Record the results and gently shake each sample.

2) The value of parallel samples should not exceed 15%. If exceeded, rinse the counter with deionized water and repeat step 1 until the difference decreases.

3) Based on the particle concentration of the blank and sample, the number of parallel samples, the volume of water, and the area of the wiping cloth, calculate the number of particles released per square meter of the wiping cloth. Calculation example:

The first blank, cl; 82 particles/ml. Second blank, c2; 72 particles/ml. Third blank, c3; 76 particles/ml. Water volume: 600ml.

The first sample, C1; 4300 particles/ml. Second sample, C2; 4800 particles/ml. Third sample, C3; 4500 particles/ml. Wiping cloth volume Aw: 240mm x 230mm

Particle/m2 wiping cloth=[(C1+C2+C3)/3- (cl+c2+c3)/3] x V/Aw=48 x 106 (2)

2.3 Record the results in the correct way, within a unit area of 20-100 μ m. And<20 μ The number of particles in m needs to be recorded. Particle size<20 μ The detection limit of m is determined by the detection needs and equipment performance. Repeat the test at least three times, calculate and record the average and standard deviation of the sample.