Modbus Duct Air Quality Sensor ANDKALQ-MD is for measuring the air quality in ducts of air-conditioning systems, optionally with 0-10 V or 4-20 mA output. Our duct air quality sensor 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 ANDKALQ-MD (surcharges):
- CO2 sensor, and/or temperature sensor, and/or huidity sensor.
- LED display – integrated in housing for live value display,
- relay / relais.
Alternative sensor versions:
- Standard active Duct Air Quality Sensor ANDKALQ-U / ANDKALQ-I.
Product number
Product number: ANDKALQ-MD
Technical Specifications
| Power supply: | 12 … 34 VAC/VDC |
| Power consumption: | max. 45 mA |
| Output: | 0…10V or 4…20mA |
| Measuring range: | 0-2000ppm |
| 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…+50°C |
| Humidity: | 5…95% r.h. |
| Protection class: | IP65 (Housing) |
| Casing: | ABS |
| Mounting equipment (included): | Mounting flange |
Algorithm: CO2 and VOC levels comparison
How do Volatile Organic Compounds (VOC) affect human well-being?
| Level od ppm (particle per million) | 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 |
Additional info for ANDKALQ-MD – Duct Modbus VOC Sensor
| 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: | Duct Mounted Air Quality Sensor |
| Application: | HVAC systems, Air handlig units, Duct Air Quality Control |
