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Temtop PMD 331 – Industrial Air Quality Monitor with Particle Counting 7 Channels
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Introduction to the PMD 331
The Temtop PMD 331 is a portable, professional-grade handheld particle counter engineered to meet ISO 21501‑4 standards. It measures airborne particulate concentrations across seven size channels—0.3 µm, 0.5 µm, 0.7 µm, 1.0 µm, 2.5 µm, 5.0 µm, and 10 µm—providing granular insight into air quality. Its rugged all‑metal, precision optical‑mechanical construction enhances interference resistance, making it suitable for industrial cleanrooms, filter testing, and pre‑screening environments
Sensor Technology & Performance
Operating on the laser Mie‑scattering principle, the PMD 331 delivers measurements with ±10% accuracy and supports a particle range up to 3,000,000 particles/ft³ (or ~105,900 per liter). The instrument’s adjustable sampling interval spans from 3 to 60 seconds, and it processes air at a steady flow rate of 2.83 L/min. Powered by a 50 mW, 780 nm laser emitter, it ensures sensitive and reliable detection across the full size spectrum
Data Storage & Connectivity
Designed for field use, the device includes onboard storage of up to 2 million measurement points. Users can view data directly on its built‑in display with intuitive button controls or export results via USB or RS‑232 (serial) connection. This facilitates easy analysis on a PC or integration with external systems for long‑term logging
Battery & Physical Specs
The PMD 331 houses a high‑performance rechargeable lithium battery that provides up to eight hours of continuous operation on a single charge. Fully recharging the unit takes approximately 3.5 hours. The device is lightweight—around 850 g (1.87 lb)—and compact, measuring roughly 6.69 × 4.33 × 1.97 inches, making it ideal for handheld or mobile use in varying environments
Applications & Use Cases
Engineered for diverse professional settings, the PMD 331 excels in filter efficiency testing, industrial cleanroom monitoring, and indoor air quality assessment. It’s especially useful for identifying sources of particulate contamination, validating remediation efforts, and supporting IAQ (indoor air quality) consultants in quantifying air improvements or maintenance outcomes
Certification, Warranty & Purchase Info
Temtop offers the PMD 331 with ISO 21501‑4 and CE compliance, along with calibration certification included in the package. The brand, based in California, boasts over a decade of expertise in particulate sensing, pairing affordability with professional capabilities. In the U.S., the listed price is approximately $1,399, with free domestic shipping and returns within 30 days, plus a standard 1‑year warranty (with free calibration for two years)
Temtop PMD 331 Tech Specs
| Your Purchase Includes | Includes 1 × Temtop PMD 331 Air Quality Monitor, Calibration Certificate, USB Cable, User Manual |
|---|---|
| Warranty | 1 Year |
| Color | Black |
| Dimensions L × W × H (inch) | 6.69 × 4.33 × 1.97 |
| Display | Monochrome LCD with physical buttons (non-touch) |
| Particle Size Channels | 0.3μm, 0.5μm, 0.7μm, 1.0μm, 2.5μm, 5.0μm, 10μm |
| Particle Sensor | Laser diode (780 nm, 50 mW), based on Mie scattering |
| Flow Rate | 2.83 L/min (0.1 CFM) |
| Counting Efficiency | 50% @ 0.3 µm; 100% @ ≥0.45 µm |
| Accuracy | ±10% at 200,000 particles/ft³ |
| Battery Capacity | 4200 mAh |
| Battery Life | Up to 8 hours of continuous use |
| Power Supply | DC 5V (USB Charging) |
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