Applied Physics · Precision technologies since 1992
Cleanrooms in semiconductor manufacturing and pharmaceutical production use airflow visualization to study flow direction, turbulence and potential contamination pathways. The AP35 uses liquid nitrogen and approved high-purity water to generate a visible tracer. Assess tracer behavior, moisture and nitrogen-displacement risks under the facility-approved protocol; fog alone does not prove compliance or eliminate contamination risk.
The AP35 combines liquid nitrogen with heated approved water to generate visible fog. This is a physical process, not a chemical reaction. Confirm the current configuration and output specification with Applied Physics.
The catalog’s approximately 571 mL/min value is a combined liquid-consumption-rate calculation, not a measured concentration of airborne droplets. Visibility and tracer behavior depend on airflow, lighting, water quality and operating conditions.
Both LN₂/water and ultrasonic water foggers can support airflow visualization. Residue and contamination risks depend on water quality, equipment cleanliness, materials and study conditions; glycol-based systems use a different fogging medium.
The visible water droplets evaporate into water vapor; nitrogen remains nitrogen gas. This does not generate oxygen or hydrogen gas or establish that the atmosphere is safe to breathe. Plan the study under an approved protocol that protects exposed product and defines post-study inspection, cleaning or drying, recovery and authorization to resume production.
The AP35 can support appropriately executed airflow-visualization studies. Select the applicable standard, edition and site procedure; the fogger does not itself certify a room or establish regulatory compliance.
Visualization can help document flow direction and reveal potential turbulence. It does not replace pressure measurements, particle classification, containment testing or other required qualification methods.
The table summarizes catalog information, not a verified performance certificate. Published AP35 pages contain differing output, distance and runtime figures; obtain the current model-specific specification and establish suitability under actual study conditions.
System Specification | Performance Metric |
|---|---|
Fog Volume | Confirm current model-specific output; catalog figures vary. |
Combined liquid-consumption calculation | Approximately 571 mL/min from catalog fill/runtime assumptions; not aerosol concentration. |
Visual Airflow Distance | Catalog example: 20–30 feet; actual visibility depends on study conditions. |
Continuous Operation Time | Catalog figures approximately 60–70 minutes; confirm configuration and conditions. |
Total Liquid Capacity | 40 liters (35 L LN2 + 5 L DI/WFI water) |
Base Construction | Confirm alloy and finish in the current supplied specification. |
Mobility | Rolling stainless‑steel frame (trolley) with wheel casters |
Semiconductor cleanrooms are classified by airborne particle concentration under the applicable standard. Legacy Class 1 to 10,000 terminology must not be confused with ISO class numbers.
The AP35 visually highlights these vortices, allowing engineers to correct ventilation issues near automated wafer transport systems, tool enclosures, and personnel entryways.
Barrier isolators and sterile compounding rooms rely on balanced airflow to prevent biological contamination.
Use suitable tracer delivery during a planned, approved qualification or process-simulation activity. Do not assume a wide fog outlet is suitable for every biosafety cabinet or that visualization can proceed during exposed sterile production.
Confirm the supplied cart, controls and remote-control configuration against the current AP35 documentation. Follow the manufacturer’s operating procedure rather than assuming a particular valve arrangement.
Follow the current AP35 operating instructions for flow control, filling and cryogenic handling. No anti-freezing guarantee is established here.
The AP35 is a current passive/dewar-style LN₂ fogger for airflow visualization; AP30 is a different self-pressurized model, not its replacement.
Appropriately qualified visualization supports airflow studies. Compliance depends on the complete facility, process and documentation requirements; an oil-free tracer does not remove moisture or contamination risks.
See the current AP35 product information and operating precautions and obtain the instructions for the supplied unit before planning a study.
Catalog information describes approximately 60–70 minutes depending on the stated configuration and conditions. Confirm the current specification and plan the study and refill procedure accordingly.
Avoid using the AP35 in the immediate vicinity of electrical appliances or water-sensitive products and equipment. Assess moisture, condensation and nitrogen-displacement risks and follow the model instructions and facility-approved study protocol.
Use liquid nitrogen and the water quality and quantities specified in the current AP35 instructions. The catalog describes a 35 L LN₂ and 5 L water configuration. Do not introduce other liquids or chemicals; fog generation does not establish an ISO cleanliness class.
The catalog describes adjustable fog output and airflow. Confirm the controls supplied with the exact unit and use them under the operating instructions and approved visualization protocol.
APPLIED PHYSICS TECHNICAL RESOURCE
Airflow visualization, smoke studies, tracer delivery, particle monitoring and controlled-environment validation. Product and standards references should be interpreted for the actual instrument, facility, protocol and configuration.
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