Brandt Instruments distributing TSI Air Velocity Meters, Ventilation Meters, IAQ Meters, Micromanometers & Thermohygrometers

Environmental Monitoring & Industrial Hygiene Instrumentation
Brandt Instruments Distributing TSI 
IAQ-Calc Indoor Air Quality Meters

TSI IAQ-Calc Indoor Air Quality Meters Models 7515, 7525, 7535, 7545, IAQ Calc

IAQ-Calc Indoor Air Quality Meters
Models 7515, 7525, 7535, 7545

(Replace Models 8732, 8760 and 8762)


TSI's IAQ-CALC™ Meters are outstanding instruments for investigating and monitoring indoor air quality (IAQ). The Model 7515 is a cost-effective meter for carbon dioxide (CO2) measurements. The Model 7535 adds data logging of CO2. The Models 7525 and 7545 simultaneously measure and data log multiple parameters. The Model 7525 measures CO2, temperature, humidity, and calculates dew point, wet bulb temperature, and % outside air. The Model 7545 adds carbon monoxide (CO).

Features and Benefits
  • Low-drift NDIR CO2 sensor for stable, accurate readings
  • Sampling function records multiple point measurements
  • Ergonomic, overmolded case design
  • Verify building HVAC system performance
  • Examine building IAQ conditions to optimize worker productivity
  • Comply with regulations and guidelines
TSI 7545 IAQ Monitor - CO, CO2, temp, %RH, %air exchange, data logging

Model Comparison

  7515 7525 7535 7545
CO2 x x x x
CO   x
Temperature x   x
Humidity %RH x   x
% Outside Air x   x
Dew Point x   x
Wet Bulb temperatrue x   x
Data Logging/Downloading x x x
Statistics x x x x
Review Data x x x
Calibration Certificate x x x x

Specifications - IAQ-CALC
Models 7515, 7525, 7535, 7545

 Sensor Type Dual-wavelength NDIR
(non-dispersive infrared)
 Range 0 to 5000 ppm
 Accuracy ±3.0% of reading or ±50 ppm,
whichever is greater
 Resolution 1 ppm
 Response Time 20 seconds
Temperature (Models 7525 and 7545)
 Sensor Type Thermistor
 Range 32 to 140°F (0 to 60°C)
 Accuracy ±1.0°F (±0.6°C)
 Resolution 0.1°F (0.1°C)
 Response Time 30 seconds (90% of final value, air
velocity at 400 ft/min [2 m/s])
Relative Humidity (Models 7525 and 7545)
 Sensor Type Thin-film capacitive
 Range 5% to 95% RH
 Accuracy ±3.0% RH
 Resolution 0.1% RH
 Response Time 20 seconds (for 63% of final value)
% Outside Air (Models 7525 and 7545)
 Range 0 to 100%
 Resolution 0.1%
CO (Model 7545 only)
 Sensor Type 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 to 90% step change

Operating Temperature 40 to 113°F (5 to 45°C)
Storage Temperature -4 to 140°F (-20 to 60°C)
Logging Capability (Models 7525 and 7545)
 Ranges Model 7525 logs up to 30,300 data points with key (3) measured parameters enabled
Model 7535 logs up to 40,300 data points with key (1) measured parameters enabled
Model 7545 logs up to 26,900 data points with key (4) measured parameters enabled
 Time Constant 1 sec, 5 sec, 10 sec, 20 sec, 30 sec (user selectable)
 Log Intervals 1 second up to 1 hour (user selectable)
Meter Dimensions
(all models)
3.3 in. x 7.0 in. x 1.8 in. (8.4 cm x 17.8 cm x 4.4 cm)
Probe Dimensions (Model 7515)
 Length 2.75 in. (7.0 cm)
 Daimeter 0.75 in. (1.9 cm)
Probe Dimensions (Models 7525, 7535, and 7545)
 Length 7.0 in. (17.8 cm)
 Diameter 0.75 in. (1.9 cm)
 Weight (with batteries) 0.6 lbs (0.27 kg)
Power Requirements
 Model 7515 Four AA-size batteries
 Models 7525, 7535, and 7545 Four AA-size batteries or AC adapter


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    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

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