FAQ-IAQ

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What is IAQ?

IAQ is the abbreviation of Indoor Air Quality. This refers to all aspects of airborne substances as well as their toxicological, physical, and physiological character. For 30 years now we at GRIMM Aerosol Technik specialize in detection of the smallest particles. Our instruments let us evaluate what is in the air and even more important where it is coming from. Our systems are exceptionally versatile and adaptable to your special need. Explore the possibilities - you will be surprised.

What kind of particles are relevant for IAQ?

Indoor Air Quality measures the quantity and quality of particles in the air of indoor and public environments, e.g. classrooms, libraries, or pubs, and even busses and cars. This data is relevant to the health of human beings and the quality of their everyday's lives. For the quantity of aerosols there are three values important: The number, the size, and the mass of particles in the air. For the quality there even more aspects are relevant: Volatile, semi-volatile, liquid, and solid particles, as well as their toxicological aspects. How far do they penetrate our respiratory system. Besides the back then important dust mass values, more and more ultrafine particles are of interest

Why is it so difficult to measure IAQ?

Grimm Aerosol Technik has 30 years of experience in measuring particles relevant to IAQ. With the combination of the Grimm NanoCheck and the aerosol spectrometer, Grimm offers the only portable system for the entire indoor aerosol monitoring. For this reason our experience and expertise is relevant for you. We combine several ways of measuring the air quality with an unrivalled precision.

How does it work?

The sample air is led directly into the measuring cell via the aerosol inlet or other custom-designed air inlets, e.g. for high wind speeds or overpressure. The particles within the sample air are being detected by light scattering inside the measuring cell. The scattering light pulse emitted by every single particle is being counted, and the intensity of its scattering light signal is then classified as a certain particle size.

Why do I need a multi-channel aerosol GRIMM spectrometer 1.108 or 1.109, when I already have a nephelometer?

Optical systems are used for many years, but most of them are only NEPHELOMETERS. These systems are cheap but are not able to measure the aerosol distribution to precisely calculate the appropriate mass . Only multi-channel spectrometers have the ability to calculate the dust mass concentration (since the size acts in the 3rd power to the volume). GRIMM developed a 15 channel as well as a research instrument with 31 size channels to provide most accurate results in real time.

Can I VALIDATE the optically measured MASS?

YES. All reference devices world-wide are gravimetric filter systems. Therefore GRIMM implemented a filter holder inside the monitor, so the collected sample can be weighed out and a correlation between the optically measured mass and the weighed sample can be established. This is necessary since different densities at different work place locations need an atmospheric aerosol correction factor (C-Factor). By entering this value all previously obtained values are now post-corrected. The basic idea behind this is to obtain a correlation accuracy r2 of these PM-values with gravimetrically measured PM-values. Due to this unique patented method of monitoring the inhalable, thoracic, and respirable mass fraction with one single instrument, thousands of such units are used world-wide every day.

Is this method OFFICIALLY approved?

YES. This method was first tested in Europe and follows therefore closely the European Regulation EN 481. This fully portable measuring device features next to the integrated filter for gravimetric post-evaluation the highlight of providing real-time data shown as a) Size and count distribution in over 15 or 31 different classes or
b) Mass distribution in over 15 or 31 different classes or
c) Simultaneously three IAQ values in one unit.

Is this unit really PORTABLE?

YES. All GRIMM IAQ monitors operate up to 8h powered by a RECHARGEABLE BATTERY inside. However they can also be operated via AC from 100 VAC to 230 VAC The most lightweight device weighs only 2.4 kg. All measured data can be shown on the display as well as transferred to the removable data logger.

Is it also possible to measure the NANO particles?

YES. All GRIMM IAQ monitors measure particles smaller 1µm in several size channels down to 250 nm. Should there be any need for monitoring ultrafine particles, optional sensors permit monitoring this size range accumulative down to 25 nm, or differential in eight size channels ranging from 12 nm to 200 nm.

Can ATMOSPHERIC values be determined in addition to the IAQ values?

YES. All GRIMM IAQ monitors feature a port for three optional sensors such as wind speed, rel. humidity, and temperature. These data will also be transmitted.

Can GAS CONCENTRATIONS be determined in addition to the IAQ Values?

YES, any approved gas sensor can be combined to our dust monitors using our data logger system in an environmental shelter. For more details see DATA LOGGER. In some industrial applications there is no need for approved sensors. For these applications we have a range of simple gas sensors for our mini-shelters so processes can be monitored every minute.

How does GRIMM collect and transfer all MONITORING DATA?

All units have a data logger port to which the powerful DATA LOGGER by GRIMM enables the data collection from our dust monitor, meteorological data, as well as gas sensor data simultaneously. These results are stored in this logger and can also be transferred via LAN or WLAN to the central data acquisition system.

How does the SOFTWARE show the measured data?

YES. All GRIMM spectrometers have a RS-232 interface which transfers your data to any PC in real time or online via the data logger. Due to the powerful and user-friendly LABVIEW software ALL DATA obtained from all connected devices can be displayed simultaneously in real time.

Is it also possible to monitor online the INSTRUMENT PERFORMANCE if the unit is installed in the field?

YES. All GRIMM spectrometers have a built-in SERVICE mode where all components, such as laser, pump, etc. are constantly controlled and its functionality reported via the data logger. Therefore the instrument performance can be supervised at any time. This ensures the reliability and considerably reduces the maintenance efforts.

How much MAINTENANCE is needed for GRIMM dust monitors when operated in the field?

Very little! Both the 15 and the 31 channel spectrometer is an optical instrument and therefore does not need any extra service so that we only recommend an annual inspection of the instrument. This is not only a significant cost saving aspect, but also a great reduction in labor costs. Considering all costs during the extremely long life cycle of our instruments, you will get the best value for your money when deciding for our technology.

What is a Nanometer?

A nanometer is very small - 1 meter compared to 1 nanometer is like the Earth's diameter compared to the diameter of a Hazelnut. Our devices detect particles in a hitherto unknown precision and ease. Our primary objective is, to satisfy YOU as our customer, and to make it work for YOU!