A. Product Overview

The Temtop PMD 331 is a handheld particle counter designed for professional airborne particle monitoring. It uses the Mie-scattering principle to detect seven different particle sizes: 0.3μm, 0.5μm, 0.7μm, 1μm, 2.5μm, 5μm, and 10μm.

The device complies with ISO 21501 and NIST standards and integrates components from global suppliers to ensure accuracy and reliability. It features a 4-inch LCD screen, built-in memory for up to 2,000,000 data records, and supports data export via USB disk or PC.

The PMD 331 is designed as a lightweight and portable instrument (less than 1 kg), suitable for rapid on-site monitoring. It includes a rechargeable lithium battery with approximately 8 hours of operation and a fast charging time of 3.5 hours.

B. Working Principle

The Temtop PMD 331 operates based on the light scattering (Mie-scattering) principle.

Air samples are drawn into the device at a flow rate of 2.83 L/min. Inside the device, a laser diode (50mW, 780nm) emits light onto particles present in the air. When particles pass through the laser beam, they scatter light, and the intensity of scattered light is measured.

Based on the scattering intensity, the instrument classifies particles into different size channels (0.3μm to 10μm) and displays the count results on the LCD screen.

C. Why It Is Used

The Temtop PMD 331 is used for accurate measurement and monitoring of airborne particles in various environments.

It is designed to:

• Detect multiple particle sizes simultaneously
• Provide precise and reliable particle concentration data
• Support compliance with monitoring standards (ISO 21501)
• Enable data logging and export for further analysis
• Facilitate on-site monitoring through portable design

The instrument helps users monitor air quality conditions and maintain controlled environments by providing real-time particle data.

D. Suitable Buyers

Based on the product capabilities described in the PDF, the Temtop PMD 331 is suitable for:

• Users requiring airborne particle measurement
• Professionals performing on-site air monitoring
• Applications needing data logging and export functionality
• Environments where portable and lightweight instruments are required
• Users needing multi-channel particle size detection

E. FAQ

1. What particle sizes can Temtop PMD 331 measure?
It measures 0.3μm, 0.5μm, 0.7μm, 1μm, 2.5μm, 5μm, and 10μm particle sizes.

2. What principle does the PMD 331 use for measurement?
It uses the light scattering (Mie-scattering) principle to detect airborne particles.

3. What is the flow rate of the device?
The flow rate is 2.83 liters per minute.

4. How much data can the device store?
It can store up to 2,000,000 data records.

5. How is data exported from the device?
Data can be exported using a USB disk or to a PC for further analysis.

6. What is the operating time of the device?
The device provides approximately 8 hours of operation under normal conditions.

7. Is the device portable?
Yes, it is lightweight (less than 1 kg) and designed for easy carrying and on-site monitoring.