A dust particle counter is an instrument used to measure the number of dust particles in a clean room. Choosing the right dust particle counter is critical to ensuring cleanliness in your cleanroom. The following will introduce how to choose the right dust particle counter according to the characteristics and needs of the clean room.
1. Sensitivity: smaller particles that can be detected.
Zero Count Level or False Count Rate: The number of particles that are falsely reported with filtered air at a more optimal flow rate, for a given amount of time. Correct reporting, which is the number of particles per 5 minutes. (The expected zero count rate should be less than 1 count every 5 minutes).
2. Counting efficiency: the ratio of the true particle concentration to the measured particle concentration.
The true particle concentration is measured with a more sensitive instrument, with a smaller particle size of the instrument under test with a counting efficiency of 100%. A properly designed instrument should have a 50% counting efficiency.
3. Channel: This is the "box" where the particles are placed in their respective sizes according to the number of each particle count.
Channels represent microns. For example, you might have a 4-channel particle counter. This means that the particles are in 4 different channels and can be calculated and classified. An example of a channel is: 01 micron, 02 μm, 03 μm, 05 μm, 10 μm, 50 microns.
4. Flow velocity: This is the amount of air that passes through the particle counter.
This is usually expressed in cubic feet per minute. A common flow rate is 10 cfm and 01cfm。The higher the flow rate, the larger the pump to make the air and particle counters. Of course, there are other parameters that should be considered when choosing a particle counter.
Choosing the right dust particle counter is critical to ensuring cleanliness in your cleanroom. In the selection process, factors such as the grade of the clean room, the size distribution of dust particles, the sampling flow rate and sampling time, and the data output and data analysis functions should be comprehensively considered. Through the reasonable selection and use of dust particle counters, the cleanliness of the cleanroom can be effectively monitored and managed, so as to ensure the quality of the product and the health and safety of the production environment.