Particulate Matter Transmitter - PMsense

Delta Ohm


Meausurement of the exact content of PM1.0, PM2.5 and PM10.
Stand-alone unit, easy to integrate in Automatic Weather Stations.
Easy Cloud Connection.

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Type of Instrument Air Quality Analyzer
The Sensor measures: Particles

The PMsense is a PM1.0, PM2.5 and PM10 Particulate Matter transmitter with RS485 Modbus-RTU output that is suitable for outdoor air quality monitoring.

The concentration of dust particles  is measured using a laser scattering principle.

The transmitter is maintenance-free and has fast response, high sensitivity and an excellent stability.

The PM sensor can be operated in two manners:

-  Continuous operating mode: the sensor is always active and measurements are continuously taken. In this mode at least 10,000 hours of PM sensor life are guaranteed.
-  Discontinuous operating mode (default): the sensor is activated at regular intervals, when measurements has to be taken. This mode increases the PM sensor life.

On request there is an optional CO2 sensor that can be integrated in the trasmitter.

The transmitter may be supplied with up to 2 optional configurable 4…20 mA, 0…5 V or 0…10 V analog outputs.

More background information on why to measure Particulate Matter (PM) can be found here.

Delta OHM introduced a logger with PM measurement. But why would you want to measure PM? What is PM10 or P2,5 or PM1,0; why should it be measured. In this article we try to answer some questions.

Particulate Matter (PM) also called Particle Pollution.
An explanation of the term PM, as found on the site of the EPA (United States Environmental Protection Agency): the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small they can only be detected using an electron microscope.

What does the number behind PM stand for:
The number stands for the size of the particle, expressed in micro-meters.
So: PM1.0 means the collection of measured particles that have a diameter of 1µm or less. Talking about PM10 means that we take in consideration all particles with a size of 10µm or smaller.

Why is it interesting to know the PM:
The particles that we talk about are that small that we (can) inhale them without noticing. But the effect of inhaling them can have dramatic consequences. Especially particles smaller than PM2.5 are considered to be dangerous for human health; they can get deep into your lungs or may even get into your bloodstream.

Where does this Pollution comes from:
Some of the particles are being formed by human interaction, some are the result of reactions of spontaneous reactions of chemicals that are in the atmosphere. The ones that are being emitted as result of human interaction can be found in areas with high industrial activity, fires, smoke, construction sites or in areas with high activity of cars and transport.

Particulate Matter Pollution:
The datalogger that Delta OHM has introduced measures the Air quality inside buildings. Delta Ohm will also introduce an outdoor version that will be combined with our AWS (Automatic Weather Station). Buildings where it is likely to face problems with air quality are e.g. the ones near heavy traffic situation in cities or highway areas. Or as another example, offices connected to industrial workplaces in steel mills, cement factories or other production areas.

Let it be clear:
Measuring the Air Quality is highly important when we care about health. Based on the measurement we can take temporarily measures (ventilation or even working on other spots) or we can use it to improve air conditioning and filtering of the air.

Interested? Have a look at the specifications of the HD50PM – very simple to install (power and a WiFi or cables network will do). Can be used with cloud storage, in a network of loggers or as stand-alone unit. Or just ask us for more information.