• Conduct indoor air quality (IAQ) evaluations
• Verify building HVAC system performance
• Examine building IAQ conditions to optimize worker productivity
• Comply with regulations and guidelines

• Low-drift NDIR CO2 sensor for stable, accurate readings
• Sampling function records multiple point measurements
• Ergonomic, overmolded case design

• Measure temperature and relative humidity to determine thermal comfort
• Calculate percentage outside air from either CO2 or temperature
• Directly calculate dew point and wet bulb temperatures
• Electrochemical sensor measures CO (Model 7545)
• Display up to three parameters
• TSI LogDat2™ software for easy data transfer to a computer
• Data can be reviewed on-screen or downloaded for report generation
• Statistics function displays average, maximum, minimum values, and number of recorded samples

TSI IAQ-Calc™ Meters are excellent instruments for investigating and monitoring indoor air quality (IAQ). Model 7515 is a cost-effective meter for carbon dioxide (CO2) measurements. Models 7525 and 7545 simultaneously measure and data log multiple parameters. Model 7525 measures CO2, temperature, humidity, and calculates dew point, wet bulb temperature, and percentage outside air. Model 7545 adds detection of carbon monoxide (CO).

• CO2 Sensor Type: Dual-wavelength NDIR (non-dispersive infrared)
• Range: 0 to 5,000 ppm
• Accuracy: ±3.0% of reading or ±50 ppm, whichever is greater
• Resolution: 1 ppm
• Response Time: 20 seconds
• Temperature (Models 7525 and 7545): Thermistor, Range 0 to 60°C (32 to 140°F), Accuracy ±0.5°C (±1.0°F), Resolution 0.1°C (0.1°F), Response Time 30 seconds
• Relative Humidity (Models 7525 and 7545): Thin-film capacitive, Range 5% to 95% RH, Accuracy ±3.0% RH, Resolution 0.1% RH, Response Time 20 seconds
• Percentage Outside Air (Models 7525 and 7545): Range 0 to 100%, Resolution 0.1%
• CO (Model 7545 only): Electro-chemical, Range 0 to 500 ppm, Accuracy ±3.0% of reading or ±3 ppm, whichever is greater, Resolution 0.1 ppm, Response Time <60 seconds
• Operating Temperature: 5 to 45°C (40 to 113°F)
• Storage Temperature: -20 to 60°C (-4 to 140°F)
• Logging Capability (Models 7525 and 7545): Model 7525 logs up to 30,300 data points, Model 7545 logs up to 26,900 data points, Time Constant 1 sec to 30 sec (user selectable), Log Intervals 1 second up to 1 hour (user selectable)
• Meter Dimensions (all models): 8.4 cm x 17.8 cm x 4.4 cm (3.3 in. x 7.0 in. x 1.8 in.)
• Probe Dimensions (Model 7515): Length 7.0 cm (2.75 in.), Diameter 1.9 cm (0.75 in.)
• Probe Dimensions (Models 7525 and 7545): Length 17.8 cm (7.0 in.), Diameter 1.9 cm (0.75 in.)
• Weight (with batteries): 0.27 kg (0.6 lbs)
• Power Requirements: Model 7515 uses four AA-size batteries, Models 7525 and 7545 use four AA-size batteries or AC adapter

Specifications are subject to change without notice. TSI and the TSI logo are registered trademarks, and IAQ-Calc Indoor Air Quality Meters and LogDat2 are trademarks of TSI Incorporated.