Frequently Asked Questions

 

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A. With most scientific instruments once per year is adequate for normal operation and repeatable performance within the stated accuracy for the instrument. Individual company’s internal quality plans may require more frequent calibration intervals.
A. Upon completing a measurement sample with a particle counter, the unit can display the count values as Sigma (cumulative) and Delta (differential) readings.

The Sigma value is the count of all particles from that specific size channel, and greater, combined. The Delta readings are the values for the size channel named, up to but not including the next largest size channel.

For example, if your channels are set to 0.3, 0.5, 1.0µm, etc. the cumulative (sigma) value for the 0.3 µm channel represents the count of all particles 0.3um and larger. The differential (delta) value for the 0.3um channel represents the count of all particles larger than or equal to 0.3um but smaller than 0.5um. Likewise, the sigma value for the 0.5um channel represents the count of all particles 0.5um and larger, while the delta value for the 0.5um channel represents the count of all particles larger than or equal to 0.5um and smaller than 1.0um.

A. The CNT is the total running count for that size channel, the /CF is the count per cubic foot (actual or calculated), and the /M3 is the count per cubic meter (typically calculated as a running average dependent on the duration time of the sample.)
A. This indicates that the number is too large to display, and scientific notation is being used to display the value.

For example, if the display for the 0.5µm particle channel reads 1.23 E 7 this value would mean to move the decimal point 7 places to the right for the value of the measurement equal to 12,300,000. This is typically only seen in the /M3 (counter per cubic meter) measured value mode.

A. Yes, Airy particle counters meet all of the measurement and calibration requirements as described in the ISO standard for calibration of an airborne particle counter.
A. The ISO mode feature (for ISO 14644) built in to the Airy handheld particle counters differs by model.

P311 Particle Counter
Allows for the additional indication of standard deviation, average, and 95% UCL. The user must calculate and determine the minimum number of sampling locations and time of sample at each location.

P611 Particle Counter
Allows for the same indication as the P311 with standard deviation, average, and 95% UCL. However, the user can input the area of the cleanroom or critical environment to be measured, and the meter will calculate the minimum number of sampling locations and the amount of time for each sample point.

A. Airy Software is only programmed to work on Windows based computers. The software is designed for and is tested to work withWindows 2000, Windows Vista, Windows XP, Windows 7, and Windows 8.
A. The software installation program automatically installs the necessary drivers, allowing the user to simply connect the particle counter to the PC through the included USB cable.