Available Gas Concentration, Sensors, Probes & Connectors
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Available Gas Concentration, Sensors, Probes & Connectors - 1

www.ahlborn.com ri GAS CONCENTRATION IN AIR Why is the Measurement of Room Air Quality So Important? An unsatisfactory room air quality of indoor rooms (e.g. in offices) can easily cause tiredness, poor powers of concentration and even diseases to people. Indicator for the room air quality is the concentration of specific gases in air. The most important ones include: ► Carbon dioxide (CO2) ► Carbon monoxide (CO) ► Oxygen (O) ► Ozone (O3) CO2 Concentration An important criterion for the evaluation of the room air quality is the CO2 concentration. A CO2 concentration, which is too high due to insufficient ventilation, is experienced as stale or stagnant air. The illustration above shows the range of CO2 concentrations that are relevant to a human. CO Concentration CO is produced when carbon is only partially combusted (fuel). CO is very dangerous for humans because it is at the same time highly toxic - and invisible and odorless. Reasons for the production of CO in various combustion processes : ► deficiency of air ► too high excess of air ► too early cooling down of flame Effects of CO in the ambient air on the human body CO concentration Inhalation period and consequences s. e g n a ch al ic ni ch te e a m to igh e e vr er s re e un o o 30 ppm 0.0003% Maximum concentration in the workplace per 8-hour shift (German MAK value) 200 ppm 0.02% Slight headache within 2 to 3 hours 400 ppm 0.04% Headache within 1 to 2 hours, first in the forehead and temples, then spreading to the whole heac 800 ppm 0.08% Dizziness, nausea, and twitching limbs within 45 minutes, unconsciousness within 2 hours 1600 ppm 0.16% Headache, dizziness, nausea within 20 minutes, death within 2 hours 3200 ppm 0.32% Headache, dizziness, nausea within 5 to 10 minutes, death within 30 minutes 6400 ppm 0.64% Headache and dizziness within 1 to 2 minutes, death within 10 to 15 minutes 12800 ppm 1.28% Death within 1 to 3 minutes Applications ► measurement, control, and warning system in garages, ► monitoring of room air quality with respect to maximum permissible workplace concentration (MAK value) ► monitoring of outside air or of protected air systems in domestic and large public shelters 16.02 5

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Available Gas Concentration, Sensors, Probes & Connectors - 2

GAS CONCENTRATION IN AIR Cl 02 Concentration The inhaled air consists of vital oxygen at a ratio of 1:5. Oxygen is required for all oxidation processes; for combustion processes, as well as for silent oxidations. Examples include the rusting of iron, oxidations, which occur in living processes, or the decomposition of organic material. Additionally, all combustion processes that release energy require this gas, for example, heating systems or aircraft engines. However, oxygen is also bound with any type of noxious fires such as forest and heath fires. Due to the permanent cycle of...

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Available Gas Concentration, Sensors, Probes & Connectors - 3

www.ahlborn.com ri GAS CONCENTRATION IN AIR 0 Carbon Dioxide Sensor, hand-held Type FYA600CO2H Technical Data: Sensor: 2-channel infra-red absorption principle Measuring range: 0 to10 000 ppm (0 to 1 vol% CO2) Accuracy: (under nominal conditions) 0 to 5000 ppm± (50 ppm+ 2% of measured value) 5000 to 10000 ppm ±(100 ppm +3% of meas. value) Resolution: 1 ppm or 0,0001 vol % Nominal conditions: 22°C ±2 °C / 50 % rF ± 10 % rF Ambient temperaturer: 0 to +50 °C Storage temperature: -20 to +50 °C Ambient atmospheric humidity: 0 to 90 % rF (non-condensing) Temperature coefficient 0,4% of measured...

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Available Gas Concentration, Sensors, Probes & Connectors - 4

GAS CONCENTRATION IN AIR o Carbon Monoxide Probe Type FYA600CO Technical Data: Gas: CO Measuring principle: electrochemical reaction Measuring range: 0 ... 150 ppm, 0 ... 300 ppm, 0 ... 5% Zero point error: < 10 ppm CO Gauge reading balance: <3 ppm CO Error of meas. value: ±3% of full scale value Zero point drift: < 2% (1 year) Reproducibility: < 2% (1 year) Linearity: < 2% of full scale value Settling time t»,: < 60s Transverse sensitivity: < 2% by integrated filter Output: 4 ... 20 mA on ALMEMO® connecter Supply voltage: from the ALMEMO® measuring instrument Ambient temperature: -10 to...

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Available Gas Concentration, Sensors, Probes & Connectors - 5

www.ahlborn.com ri GAS CONCENTRATION IN AIR Ozone Measuring Transducer Type FYA600O3 Technical Data: Gas: O3 (ozone) Measuring principle: electrochemical three-electrode sensor Measuring range: 0 ... 300 ppb Accuracy: typically 5% of final value under nominal conditions (for intermittent operation) Long term accuracy: after 12 months under nominal conditions typically 5% of final value (for intermittent operation) Exposure period : until specification is reached, at least 2 hours (at 200 ppb); for a prolonged period the device was in an ozone-free environment Meas. interval: pump on: 5min...

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Available Gas Concentration, Sensors, Probes & Connectors - 6

GAS CONCENTRATION IN AIR Cl The sensors used for measuring gas concentration in air - at a glance with measuring instrument ALMEMO® 2590-9 o 2 o o Un e CD e m < CD CD q" O QJ CD fD O s o QJ =S CTQ CD www.ahlborn.com 16.07

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