New Product

Amphenol SM-UART-04L Particulate Dust Sensor | Tech Specs

May 16, 2019 by TTI, Inc

The SM-UART-04L is a laser-based sensor capable that quickly and accurately provides PM2.5 measurements.

This episode of Tech Specs is part of a video series highlighting the features, applications, and technical specs of newly-released products.

Amphenol Sensors Laser Dust SM-UART-04L

The SM-UART-04L is a laser-based sensor capable that quickly and accurately provides PM2.5 measurements. A fan pulls air into the housing, where a laser LED illuminates the particles and a photo sensor detects reflections from particles ranging from 0.3 to 10 microns.  

The SM-UART-04L is easy to use, as the output of the photo sensor is processed by an integrated MCU and the measured concentration levels are output over a UART interface, with a detection range of 1 to 999 micrograms per cubic meter. The laser-based measurement offers a fast 1 second response time and an average of 40,000 hours before re-calibration is required. 

  • Fast, accurate PM2.5 + PM10 measurements
  • Particle size: 0.3µm to 10µm, 2.5µm typical
  • Output: UART (3.3V)
  • Detection range: 1µg/m3 to  999µg/m3
  • Response time: 1 second
  • Laser life (average time before re-calibration): 40,000 hours

More Information 

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1 Comment
  • O
    oridroo May 28, 2020

    Hi There,
    I have been trying to make this Sensor work with the microprocessor Pycom. The problem is, most of the time I’m getting the output as ‘1’. I left it on battery power and observed it over several days. So if we run a diesel gas heater inside the office, the reading goes up. Sometime without any such event, the reading climbs up and then start coming down. By evening, it becomes 1 again and stays like that till next day.
    On the other hand, I kept it outside in the environment where cars are passing by. I got just flat 1 output for the whole day!
    I have been reading every 10 minutes. I tried to contact Amphenol but couldn’t find any valid contact number or email address except the inquiry submission form. I submitted enquiry twice but no response.
    The datasheet also doesn’t provide any idea about the validity of the readings I have been getting so far. Would you be able to help me out please by any mean?
    Looking forward to hearing from you.


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