Modbus Indoor Air Quality Sensor ANDRALQ-MD for measuring the air quality in living and office spaces etc, through a Modbus connection. The sensors can be connected to a variety of PLC or DDC controllers. The ANDRALQ-MD is a VOC/mixed gas sensor The CO2 equivalents are derived from a conforming algorithm as the odor emissions are overlaying the CO2 value (see graphics). Long-term drifting and operational deterioration can be eliminated by regularly running the automatic calibration.
Additional options for sensor ANDRALQ-MD (surcharges):
- active potentiometer,
- passive potentiometer,
- CO2 sensor,
- display,
- relay,
Alternative sensor versions:
- Indoor Air Quality Sensor ANDRALQ-U / ANDRALQ-I.
Product number
Product number: ANDRALQ-MD
Technical Specifications for Modbus Air Quality Sensor
| Power supply: | 12… 34VAC/VDC |
| Measuring range: | 0-2000ppm |
| Power consumption: | max. 45 mA |
| Calibration: | 1 V … 5,6 mA = 200 ppm CO2 equivalent 5 V … 12 mA = 1000 ppm CO2 equivalent 10 V … 20 mA = 2000 ppm CO2 equivalent |
| Operating temperature: | 0°C…+50°C |
| Humidity: | 5…95% r.h. |
| Protection class: | IP20 |
| Housing: | Material ABS, Colour RAL 9011 |
| Measurements housing: | 87,5 x 87,5 x 30 mm |
Want to learn more about how our CO2 and quality sensors work and how they can benefit your application?
Datasheet ANDRALQ-MD
Datasheet ANDRALQ/T/F-MD
VOC Sensor Modbus Versions: LCD display / LED indication / without indication
How ppm in VOC sensors affect human well-being?
| Level od ppm | Effects | Effects |
| > 40.000 | ⬤ | serious damage / deadly |
| 5000 | ⬤ | dangerous on prolonged exposure |
| 2000 – 5000 | ⬤ | negative health effects |
| 1200 | ⬤ | ventilation necessary |
| 1000 | ⬤ | ventilation desirable |
| 800 | ⬤ | accepted level |
| 450 – 600 | ⬤ | healthy indoor climate |
| 250 – 350 | ⬤ | healthy outside air level |
Algorithm: CO2 and VOC levels comparison & events / over time
Additional info for Modbus VOC sensor ANDRALQ-MD
| Protocol: | Modbus (ASCII/RTU), RS485 |
| Power supply: | 12-34 VAC/VDC |
| Dimensions: | 75 x 69 x 44 mm |
| Housing: | PA6, Color RAL 9011 |
| Protection class: | IP65 |
| Sensor: | Air Quality Sensor |
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