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  5. BZ25 CO2 air quality monitor

BZ25 CO2 Air Quality Monitor

Reliable measurement of the indoor air quality

We spend more than 90 % of our life indoors. Besides, with building structures growing closer and closer together, exhausting pollutants are increasingly impeded with noticeable consequences for the air quality.

Increased concentrations of carbon dioxide – even when they are still within the permissible limit values – can not only lead to fatigue, lapse of concentration or performance loss, but further cause serious health problems especially for children or enfeebled persons.

Using the BZ25, the indoor air quality can reliably be monitored – the ideal air quality monitor for use in work, living or children's rooms, class rooms, kindergartens or office and production environments.

Thanks to the accurate and permanently stable NDIR measurement method, the BZ25 in addition to air temperature and relative humidity also captures the current concentration of carbon dioxide in the room air and indicates these in steps of 1 ppm on the easily legible display.

Additionally, an individual CO2 alarm limit value can be defined, which when exceeded is indicated by means of an acoustic warning signal.

A practical additional function of the BZ25 is the CO2 indicator with simple icon presentation of a good, normal or unfortunate concentration of carbon dioxide in the room air on the large LCD display, which further shows time and date.

A few practical benefits:

  • Accurate and permanently stable NDIR measurement of carbon dioxide concentrations in the room air
  • Simultaneous display of CO2 values, room temperature, humidity, date and time
  • Minimum and maximum value function for CO2, air temperature and humidity
  • Automatic Baseline Calibration
  • Carbon dioxide alarm function with acoustic alarm signal for freely definable limit values
  • Additional symbolic CO2 indicator display
  • Large backlit display with easily legible measured value indication
  • Free standing or wall mounted
  • Optimum price-performance-ratio

Automatic baseline calibration

The expected CO2 fresh air value is about 400 ppm (0.04 %vol) nowadays. The device assumes this value to be the lowest limit value (baseline). Over several days, a special algorithm now permanently checks the lowest CO2 value measured of the sensor over a preconfigured time interval and slowly corrects every long-term drift determined by comparison with the expected fresh air value of 400 ppm (or 0.04%vol) CO2. In normal indoor applications, the carbon dioxide level usually decreases almost to outdoor air level at some point during one week. By recording the values over a period of 8 days and then comparing the lowest value to the 400 pm point, the device determines whether or not it needs to adjust the zero point. This takes place fully automatically. The algorithm therefore makes use of the fact that the CO2 content in buildings and rooms regularly stabilises at a minimum for a certain period of time when they are not occupied. In rooms that are continuously occupied or where there is a constantly increased CO2 concentration (e.g. in greenhouses), this principle of automatic balancing therefore does not work.


BZ25 CO2 Air Quality Monitoring Device show in Trotec online shop

BZ25 CO2 Air Quality Monitoring Device

Too much CO2 in the air can have a variety of effects, not just fatigue and tiredness, on the occupants of a room. Find out if it’s just the poor air quality that’s putting you, your colleagues or the students in your class to sleep ...

154.93 £ incl. VAT Show net price (VAT not included)


Technical data

Technical data
General information
  Article number 3.510.205.014
Air temperature [°C]
  Min. measuring range | Air temperature [°C] -5
  Max. measuring range | Air temperature [°C] 50
  Resolution [°C] 0.1
  Accuracy ± | Air temperature [°C] 1
Air temperature [°F]
  Min. measuring range | Air temperature [°F] 23
  Max. measuring range | Air temperature [°F] 122
  Resolution [°F] 0.1
  Accuracy ± | Air temperature [°F] 1.8
Relative humidity (%)
  Min. measuring range | Relative humidity [%] 0.1
  Max. measuring range | Relative humidity [%] 99.9
  Resolution | Relative humidity [%] 0.1
  Accuracy ± [% r.F.] 5
Carbon dioxide (ppm)
  Carbon dioxide sensor NDIR sensor (non-dispersive infrared)
  Min. measuring range | Carbon dioxide [ppm] 0
  Max. measuring range | Carbon dioxide [ppm] 9,999
  Accuracy | Carbon dioxide [ppm] 75
  Accuracy | Carbon dioxide [%] 5
  Resolution | Carbon dioxide [ppm] 1
Device control
  Push buttons
Housing design
Power supply
  External (power adapter)
Ambient conditions
  Operation - min. temperature [°C] -5
  Operation - max. temperature [°C] 50
  Operation approx. - max. relative humidity (non-condensing) [%] 90
  Storage - min. temperature [°C] -5
  Storage - max. temperature [°C] 50
  Storage - max. relative humidity (non-condensing) [%] 90
  Length (packaging excluded) [mm] 90
  Width (packaging excluded) [mm] 110
  Height (packaging excluded) [mm] 98
  (packaging excluded) [kg] 0.19
Standard scope of delivery
Standard scope of delivery
  Measuring device
  Power adapter
  Operating manual
  Storage case
  Factory test certificate
Ascertainable measured values and functions
Internal sensors
  Relative humidity [%]
  Carbon dioxide [ppm]
  Air temperature [°C]
  Air temperature [°F]
Functions and features
  Minimum value display
  Maximum value display
  Measured value hold function
  Automatic Baseline Calibration
  Switching function °C/°F
  Backlit display
  CO2acoustic alarm function
  Feel-good indication

 standard equipment

 optionally available

 not available



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