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Free Shipping IN USA
Shipping within 24 hours. Free Standard Shipping(US Only): 3-5 Days for delivery.
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30 DAYS RETURNS
Not the right fit? No worries. We'll arrange a full refund within 7 days including the delivery fee.
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1 YEAR WARRANTY
Quality comes first and our products are designed to last.
* Customers outside the USA need to pay taxes on their own.
We will arrange the shipment within 30 working days after your payment.
The PMS 31 is a high-precision remote particle counter designed for professional cleanroom and industrial air quality monitoring. Built for reliability and accuracy, it features a 7-channel particle size detection system and a powerful built-in 28.3 L/min vacuum pump for high-volume sampling.
Engineered with industrial-grade components, the PMS 31 delivers stable, long-term operation in demanding environments such as semiconductor, pharmaceutical, and precision manufacturing facilities. Its metal housing ensures durability and strong anti-interference performance.
All instruments are ISO 21501 and JJF 1190-2008 compliant, ensuring measurement traceability and consistency with global standards.
Key Features
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Seven-channel monitoring: 0.3 μm, 0.5 μm, 0.7 μm, 1.0 μm, 2.5 μm, 5.0 μm, 10 μm
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High flow rate: 28.3 L/min (±5%) for fast and accurate particle sampling
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Long-life laser source: 50 mW / 780 nm, up to 20,000 hours of continuous operation
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Industrial-grade RS485 (Modbus RTU) communication for seamless integration
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5-inch TFT display for intuitive data visualization
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Adjustable sampling time: ≥ 10 seconds
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Built-in air pump — compact design, easy installation, and maintenance-free
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Wide operating range: 0–50 °C; DC 24 V supply
Specifications
| Parameter | PMS 31 |
|---|---|
| Measured Particle Size | 0.3 μm, 0.5 μm, 0.7 μm, 1.0 μm, 2.5 μm, 5.0 μm, 10 μm |
| Counting Efficiency | 0.3 μm: 50%; ≥ 0.5 μm: 100% |
| Resolution | 1 P/L |
| Flow Rate | 28.3 L/min (Error ±5%) |
| Vacuum Source | Built-in air pump |
| Measurement Principle | Light scattering method |
| Laser Source | 50 mW / 780 nm long-life laser |
| Alarm | Indicator light |
| Sampling Time | Adjustable (≥10 s) |
| Communication | RS485 (Modbus RTU) |
| Operating Temperature | 0–50 °C |
| Storage Temperature | -20–60 °C |
| Operating Voltage | DC 24 V |
| Operating Current | 3500 mA (average) |
| Display | 5-inch TFT screen |
| Dimensions | 120 × 180 × 80 mm |
Why Choose PMS 31
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Meets ISO 21501 and JJF 1190-2008 standards
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Designed for continuous operation (24/7 use)
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Compatible with industrial monitoring networks
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Reliable, efficient, and built for high-purity applications
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return results from our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper. However, you will receive a refund more quickly in many cases. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, please email support@elitechus.com.
We'll notify you via email of your refund once we've received and processed the returned item.
Return Shipping Address: Elitech Technology, Inc. 2528 Qume Drive #2, San Jose, CA 95131, United States
Tel: (+1)4088444070
Shipping: We can ship to virtually any address in the world.
Note that there are restrictions on some products, and some products cannot be shipped to international destinations. When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose.
Depending on your chosen shipping provider, shipping date estimates may appear on the shipping quotes page. Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
United States: Shipping within 24 hours.
Free Standard Shipping in the US: 3-5 Business Days for delivery.
Next Day Shipping Service Available in the US: Orders placed before 12:00 pm PST will be shipped on the same day! The Next Day shipping on Friday will be shipped on next Monday(Since we don't work at the weekend).
Worldwide: Fast Worldwide DHL Shipping.
2-3 business days to prepare the items and 10-14 business days for delivery. The buyer covers tax.
Note: ISO 17025 certified version data loggers are PRE-SALE only.
Lead time: 2 weeks.
The shipping cost will be shown according to the weights and countries at the checkout. If your items were lost in transit, please email support@elitechus.com.
We will send you a replacement or a refund.
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