Workplace Air Sampling

Many airborne materials can be extremely harmful to health, even in the smallest measurable concentrations. As such, businesses have a responsibility to ensure that air quality standards are met, both in the workplace and the wider environment. Government agencies have established ceiling values and guidance limits for a range of gases, vapours, radionuclides and dusts. In the UK, COSHH Regulations (Control of Substances Hazardous to Health, 2002) state that employers must take all steps possible to protect workers from exposure to health-harming substances. Where exposure limits are breached, employers place themselves at risk of large fines and even conviction. The HSE recommends regular monitoring of one’s work environment to ensure industry regulations are met. A helpful list with information about maximum exposure limits and occupational standards is downloadable for free on their website (E40/2005).

In order to make an air quality assessment, a sample is taken for analysis. This is done by drawing a measured volume of air through a collection substrate. The airborne concentration of a particular substance is then calculated by assessing the analytical result and the volume of air sampled. It is therefore extremely important that the air flow rate and sample time are recorded with the upmost accuracy. For this reason, air samplers should incorporate an airflow sensor and/or control mechanism, a malfunction indicator and a timer.

The huge variety of sampling applications calls for a number of different air sampler configurations. When the active concentration of a pollutant is very low, a real-time monitor may not be sufficiently sensitive to detect background levels. In such cases, a large sample must be taken quickly and accurately so as to make a proper assessment. Munro air samplers can draw from 5 millilitres per minute to 100 litres per minute or more through a range of sampling media (including glass fibre and cellulose filters for dusts and activated carbon for gases and vapours). Our air samplers suit a range of applications (perimeter monitoring, stack emissions sampling, personal sampling, routine workplace measurements and re-assurance monitoring) and are used extensively in the nuclear, agricultural and pharmaceutical industries.

Click here to view our range of Air Sampler Pumps.

If you would like further information about any of our Air Quality products, please get in touch via email ( or phone (+44 20 8551 7000).

by Edmund Daley

Development of Munro Wind Sensor

150 years down the line, Munro continues to go from strength to strength. We specialise in the manufacture of robust and reliable instrumentation, employing technology proven through years of use. Our instruments are built to withstand even the most adverse of environments, meaning low maintenance, low costs and low hassle. But however proud we may be in our old age, we are constantly seeking new ways to supplement and enrich our long history. It is with great excitement, therefore, that we embark on a new phase of product development.

Current projects include an update of our acclaimed IM146 In-Line Wind Speed and Direction System. Responding to the universal demand for accessible, instantaneous data, we have equipped the device with a GPRS data logger, allowing for wireless telemetry. Users will now be able to remotely access and collate information on all key wind parameters via our brand new web-based software ClimateCloud. Access to this will be via subscription. An unlimited number of sensors will be configurable to a single account, allowing users to create their very own wind speed and direction network (viewable on a Google-style map). Email/SMS notifications will be sent when threshold measurements are breached, and there will be infinite storage capacity for historic data.

Technologically speaking, the magslip, used to power the IM144 Wind Direction Sensor (which, together with the IM124, makes up the IM146), has been replaced by a magnetic encoder. Current users of the IM144/146 will be given the opportunity to upgrade their system to make it compatible with the GPRS data logger and software package. Owing to the magslip conversion, existing wind direction dial indicators will, however, need to be replaced.

We are rebranding the IM146 as the IM147 and will be unveiling it at the 2014 World Meteorological Technology World Expo in Brussels.