RLQ-W-A 0-10V / 4...20mA, LED and changeover contact, Room air quality sensor (VOC) BALDUR I

The self-calibrating microprocessor-controlled room and duct air quality sensor AERASGARD~ RLQ serves to determine air quality based on a mixed gas sensor / VOC sensor (volatile organic compounds = volatile organic substances). It is applied: - for measuring air quality in offices, hotels, meeting and conference rooms, homes, business premises, restaurants and the like. - for quantitative assessment of the room air pollution load of polluted gases (cigarette smoke, body odors, respiratory air, solvent vapors, emissions of building materials and cleaning agents) - for adjustable sensitivity regarding the maximum air pollution to be expected - for usage-dependent air exchange of rooms, because only polluted air is exchanged, thus saving energy. Because air quality is assessed by human senses - especially by smell - it is by definition a subjective concept. Objective criteria of what people mean by good air quality are therefore difficult to establish because perceptions will vary from person to person. Due to its linearization and high operating temperature, the air quality sensor has low drift as well as good stability, thus automatic calibration is possible. The air quality sensor does not measure the concentration of a single gas, but measures the gas mixture, this means: the measurement of the gas concentration is not done selectively. Therefore, an outcome of the gas concentration in the unit ppm is also not possible. Detectable gases: mixed gases, vapors of alkanols, cigarette smoke, car gases, exhaled air, combustion smoke (from wood, paper, plastics). The group that can be measured via VOC detection includes alkenes, alkanes, aromatics, terpenes, halogenated hydrocarbons, esters, aldehydes and ketones. In addition, substances that occur freely, such as terpenes and isoprene. Also VOC gases from building chemicals, such as paints, adhesives or insulating materials, cleaning and polishing agents, chemicals for cleaning carpets and desks. The lifetime of the sensor depends on the load and gas concentration and is > 60 months under normal load. The new design offers the possibility to choose between three sensitivities, similar to three measuring ranges, by means of dip switches. Selectable is LOW for low, MEDIUM (default, corresponds to the version of this sensor delivered so far) for medium and HIGH for high VOC sensitivity.

Voltage supply	24 V AC/ DC (± 10 %)
Power consumption	< 1.5 W/ 24 V DC typical; < 2.9 VA/ 24 V AC typical; peak current 200 mA
Service life	> 60 months (under normal load conditions), depending on the type of loading and gas concentration
Measuring accuracy	± 20 % of final value (referred to calibrating gas)
Gas exchange	by diffusion
Relay output	with potential-free changeover contact (24 V / 1 A) (switchpoint can be adjusted from 0...100 % of the output signal)
Warm up time	approx. 1 hour
Response time	approx. 1 minute
Output	(0 V = clean air, 10 V = polluted air) 0 -10 V or 4...20 mA, working resistance < 800 Ω (selectable via DIP switches) with offset potentiometer (± 10 % of the measuring range
Sensor	VOC sensor (metal oxide) (VOC = volatile organic compounds), with manual calibration (via zero button), with automatic calibration (can be deactivated via DIP switches)
Measuring range	0...100 % air quality; referred to calibrating gas; multi-range switching (selectable via DIP switches) VOC sensitivity low, medium, high
Ambient temperature	0...+50 °C
Electrical connection	0.14 - 1.5 mm² via terminal screws
Housing	plastic, material ABS, color pure white (similar to RAL 9010)
Housing dimensions	85 x 85 x 27 mm (Baldur 1)
Dimensions	85 x 85 x 27 mm (Baldur 1)
Installation	wall mounting or on in-wall flush box, Ø 55 mm, base with 4 holes, for attachment to vertically or horizontally installed in-wall flush boxes for rear cable entry, with predetermined breaking point for cable entry from top/ bottom in case of plain on-wall installation
Protection class	III (according to EN 60 730)
Protection type	IP 30 (according to EN 60 529)
Standards	CE conformity, electromagnetic compatibility according to EN 61 326, EMC Directive 2014/ 30/ EU, Low Voltage Directive 2014/ 35/ EU
Optional	with traffic light indicator (five colored LEDs) for displaying the air quality.

Weight	1 kg
Brand	S+S Regeltechnik