Descriptions
PMsense is a PM1.0, PM2.5 and PM10 Particulate Matter transmitter with RS485 Modbus-RTU output, suitable for outdoor air quality monitoring.
The dust particles concentration is measured using the 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 ways:
- 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, an optional CO2 sensor can be integrated in the transmitter.
The transmitter can be supplied with up to 2 optional configurable 4…20 mA, 0…5 V or 0…10 V analog outputs.
Technical FAQ
What is Particulate Matter (PM)?
An explanation of the term PM also called particle pollution, 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 come 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:
Delta Ohm introduces an outdoor version that is combined with their 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.
