BS 8494:2007
$102.76
Electronic portable and transportable apparatus designed to detect and measure carbon dioxide in indoor ambient air. Requirements and test methods
| Published By | Publication Date | Number of Pages |
| BSI | 2007 | 18 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | Contents 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Construction, labelling and instructions 3 5 Performance 6 6 Testing 7 Bibliography 12 List of tables Table 1 – CO2 test gases 7 |
| 4 | Foreword |
| 5 | 1 Scope 2 Normative references 3 Terms and definitions 3.1 ambient air 3.2 aspirated apparatus |
| 6 | 3.3 battery-powered 3.4 calibration 3.5 clean air 3.6 diffusion apparatus 3.7 dwellings 3.8 electronic portable combustion gas analyser 3.9 gas concentration 3.10 indoor air quality apparatus 3.11 portable apparatus |
| 7 | 3.12 probe 3.13 response time (t90) 3.14 sensor 3.15 test gas 3.16 transportable apparatus 3.17 warm up period 4 Construction, labelling and instructions 4.1 Construction 4.1.1 General 4.1.2 Degree of mechanical strength and protection |
| 8 | 4.1.3 Power supplies 4.1.4 Indicators a) measured parameter, values and units of measurement; b) low battery warning for battery-powered apparatus; c) for aspirated apparatus with an integrated flow indicator, a warning when a blockage occurs (see 6.3.13); d) mode of operation or apparatus status (e.g. warm-up and measurement); and e) when values lie outside the indicating range. 4.1.5 Range and resolution a) at least across a range of 0 ppm to 5 000 ppm with a resolution of 50 ppm or better; and/or b) across a range of 5 000 ppm to 20 000 ppm with a resolution of 2% of the displayed reading or better. |
| 9 | 4.1.6 Printer or data transfer facility 4.2 Labelling and instructions 4.2.1 Labelling a) the manufacturer’s or supplier’s name, trademark or other means of identification; b) the type of apparatus, e.g. “CO2 gas analyser”, and model name or number; c) the number and year of this British Standard, i.e. BS 8494:2007; d) the manufacturer’s serial number or other unique apparatus identification; e) the replacement battery and mains power requirements if relevant. 4.2.2 Instructions a) the correct battery types and method of replacing or recharging batteries for battery powered units, details of mains voltage… b) an explanation of all warning and other indications; c) a list of commonly occurring materials, vapours or gases (e.g. cleaning fluids, polishes, paints and cooking operations) that might affect the operation or reliability of the apparatus in the short or long term; d) guidance on the life expectancy of the apparatus and batteries; |
| 10 | e) details of the operational limitations including temperature, humidity and flow (for automatically aspirated apparatus) pressure ranges; f) a warning of potential error due to CO2 solubility in water if the apparatus contains a water trap or filter; g) a warning of potential error if the apparatus is susceptible to changes in ambient light levels; h) details of the storage limitations including temperature and humidity ranges; i) details of procedure for switch on, including warm-up period; j) instructions for checking, testing and/or calibration and adjustment of the apparatus on a routine basis; k) instructions for the disposal of the apparatus at the end of its working life. 5 Performance 5.1 Response to gas 1) transient temperature (6.3.4.2) – both readings; 2) transient humidity (6.3.5.2) – both readings; 3) pressure (6.3.6); 4) air velocity (6.3.16); 5.2 Response time |
| 11 | 6 Testing 6.1 General 6.1.1 Sample and sequence of tests 6.1.2 Preparation of sample apparatus 6.1.3 Test chamber 6.2 Conditions for tests 6.2.1 Test gas Table 1 CO2 test gases 6.2.2 Speed of test gas |
| 12 | 6.2.3 Power supply 6.2.4 Temperature 6.2.5 Humidity 6.2.6 Pressure 6.3 Test methods 6.3.1 Procedure a) Switch on the apparatus and its pump (if fitted) and allow it to stabilize for the warm-up period recommended by the manufacturer. b) Expose the apparatus to: 1) test gas 1 for 180 s ± 10 s; 2) clean air for at least 180 s to purge the apparatus; 3) all other relevant levels of test gases in turn, each followed by 2). 6.3.2 Unpowered storage |
| 13 | 6.3.3 Supply voltage 6.3.4 Temperature 6.3.4.1 Steady-state 6.3.4.2 Transient 6.3.5 Humidity 6.3.5.1 Steady-state 6.3.5.2 Transient 6.3.6 Pressure 6.3.7 Low battery warning |
| 14 | 6.3.8 Vibration a) 10Hz to 30 Hz, 0.5 mm vibration amplitude; b) 31 Hz to 150 Hz, 2 g peak acceleration; c) 10 sweep cycles at one minute per octave on all three mutually perpendicular axes. 6.3.9 Dropping 6.3.10 EMC 6.3.11 Battery reversal 6.3.12 Operational stability 6.3.12.1 Continuous operation 6.3.12.2 Intermittent operation |
| 15 | 6.3.13 Sample flow 6.3.14 Response to other gases 6.3.15 Response time 6.3.16 Air velocity a) ambient air with a known concentration of CO2; and b) the test gas with the highest concentration used in 6.3. 6.3.17 Sensor replacement |
| 16 | Bibliography |
