Indoor Air Quality Meter

Indoor Air Quality Meter

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The IAQ-Calc TM TSI instruments are truly extraordinary for the control and monitoring of indoor air quality (IAQ).

The Model 7515 is an economic instrument to measure carbon dioxide (CO 2). The Models 7525 and 7545 simultaneously measure and record several parameters. The Model 7525 measures CO2, temperature, humidity, and calculates dew point temperature, wet bulb and the% outside air. The Model 7545 also measures the carbon monoxide (CO).


  • Measure indoor air quality
  • Performance monitoring of ventilation systems and air conditioning (HVAC) systems in buildings
  • Analyzes the conditions of air quality in buildings to maximize employee productivity
  • Compliance with regulations and standards

Features and Benefits - All models

  • CO 2 sensor NDIR low drift for stable and accurate measurements
  • The sampling function records several measuring points
  • Ergonomically designed carrying case and molded

7525 and 7545 models

  • Measuring temperature and relative humidity to determine the thermal comfort
  • Calculation of% outside air from the CO 2 or the temperature
  • Dew point and wet bulb temperatures directly calculated
  • An electrochemical sensor measuring CO (7545 Model)
  • The 7525 and 7545 models offer up to three parameters
  • The 7515 model only propose a parameter
  • The TSI LogDat2 TM software allows easy data transfer to a PC
  • Data can be reviewed on screen or downloaded to a computer to generate very easily a report.
  • The Statistics function displays average, maximum values. and mini. and the number of samples recorded
  • The Statistics function displays average, maximum values. and mini. and the number of samples recorded


SensorType dual wave length NDIR (Non-Dispersive Infrared)
Beach0 to 5.000 ppm
Accuracy 1± 3.0% of reading or ± 50 ppm, the highest value
Resolution1 ppm
Response Time20 seconds
Temperature (7525 and 7545 models)
SensorType thermistor
Beach0 to 60 ° C
Accuracy± 0.5 ° C
Resolution0.1 ° C
Response Time30 seconds (90% of the final value, the air speed at 2 m / s)
RH (7525 and 7545 models)
SensorCapacitive thin film
Beach5% to 95% RH
Accuracy 2± 3.0% RH
Resolution0.1% RH
Response Time20 seconds (63% of the final value)
% Outside air (7525 and 7545 models)
Beach0 to 100%
CO (7545 Model)
Sensor typeElectrochemical
Beach0 to 500 ppm
Accuracy± 3.0% of reading or ± 3 ppm, the largest
Resolution0.1 ppm
Response Time<60 seconds to 90% of a step change
Service temperature
0 to 45 ° C
Storage temperature
-20 To 70 ° C
Recording capacity (7525 and 7545 models)
BeachesThe Model 7525 stores up to 30,300 data points with all activated parameters measured. The Model 7545 stores up to 26,900 data points with all activated parameters measured. measured parameters enabled.
Time constant1s, 5s, 10s, 20s, 30s user selectable)
Recording intervals1 second to 1 hour (user selectable)
Dimensions of the instrument (all models)
8.4 cm x 17.8 cm x 4.4 cm
Dimensions of the sensor (Model 7515)
Length7.0 cm
Diameter1.9 cm
Dimensions of the probe (7525 and 7545 models)
Length17.8 cm
Diameter1.9 cm
Weight (with batteries)
7515 Model0.27 kg
7524 and 7545 models0.53 kg
Power Requirements
7515 ModelFour AA batteries
7525 and 7545 modelsFour AA batteries or AC adapter


% Outside air 
Wet bulb temperature 
Data recording / Download 
Data review 
Calibration Certificate