Cleanroom Instrument Calibration: Resolving Low-Concentration Instability with APM-18 Calibrators

In cleanroom validation and HEPA filter leakage detection, the measurement accuracy of aerosol photometers directly dictates the compliance of test results. However, when performing routine calibration and maintenance, third-party testing laboratories frequently encounter a core technical pain point: sampling flow rate instability and zero drift under ultra-low concentration conditions. To address this industry challenge, the APM-18 Aerosol Photometer Calibrator provides a highly reliable solution grounded in parametric control.

Breaking the Bottleneck of Low-Concentration Calibration Stability

Calibrating the mass concentration indication error of an aerosol photometer at extremely low concentrations requires an exceptionally stable aerosol generation source. Conventional calibrators often suffer from significant concentration fluctuations when outputting trace amounts of aerosols.

The APM-18 Aerosol Photometer Calibrator utilizes a built-in cold Laskin nozzle dust generating system to stably produce multi-scale oil mist particles in the micron range, primarily 0.3µm in size. Regarding core stability metrics, this equipment demonstrates outstanding parameter control:

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  Ultra-Low Concentration Continuity: Within the ultra-low range of (0.01~1) µg/L, the device achieves a 4-hour stability of ≤5%.

   

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  Standard Concentration Precision: In the (1~100) µg/L range, its 20-minute stability is strictly controlled at ≤3%. This output consistency, backed by definitive parameters, effectively resolves the zero drift issue during low-concentration photometer calibration, ensuring the baseline reliability of cleanroom validation instrumentation.

   

Wide-Range Adjustment and Simultaneous Multi-Device Calibration

Beyond resolving stability issues, third-party testing agencies are equally focused on calibration efficiency. The APM-18 supports a broad concentration adjustment range from 0.01 µg/L to 200 µg/L, which stabilizes in a short period of time.

To enhance laboratory operational efficiency, the calibration system supports 3 photometers for simultaneous sampling. Furthermore, the device supports two types of concentration calibration: the comparison method and the weighing method. The weighing method can be utilized with an optional 1CFM (28.3L/min) precision flow meter and filter membrane sampling device, meeting various high-precision metrological standards.

Eco-Friendly Design with Zero-Discharge Compliance

During high-concentration aerosol generation tests, secondary pollution within the laboratory remains a persistent environmental management concern. The APM-18 incorporates dual-stage filtration and features a user-replaceable liquid-tank sealed HEPA filter with a filtration efficiency of ≥99.99%. This design delivers eco-certified clean air emission, achieving strict zero-discharge compliance and safeguarding both laboratory personnel and the clean environment.