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Pacific Scientific 3313LL Met One

This listing is for a Pacific Scientific 3313LL Met One Particle Counter
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The unit is in full working condition and is ready for immediate release.

Operational & Practical Notes / Behavior

The 3313LL counts particles by passing a laser (or light source) through the sampled air stream; when particles pass through the beam, they scatter light, which is detected by a photodetector.

By having multiple size channels, the instrument can bin the counts into different particle-size ranges (for example: 0.3 µm, 0.5 µm, 1.0 µm, 3.0 µm, 5.0 µm, 10.0 µm).

It likely offers programmable sampling intervals, hold times, alarm thresholds, etc. (common features in Met One/Met One‑type instruments).

Data export via serial is standard, allowing integration with control or data acquisition systems.

Because it’s a relatively high‑flow device (1 CFM), it can sample a substantial volume of air (improving statistical confidence in counts).

The stainless steel construction helps with durability, cleanliness, and possibly resistance to corrosion or harsh environments.

As a used / legacy device, calibration, maintenance, and replacement parts (filters, laser, pump, optics) may be important considerations.