IAQ-Calc 7525 Indoor Air Quality Meters

Features and Benefits
Low-drift NDIR CO2 sensor for stable, accurate readings
Sampling function records multiple point measurements
Ergonomic, overmolded case design
Temperature and relative humidity measurements help determine thermal comfort
Calculates % outside air from either CO2 or temperature
Directly calculates dew point and wet bulb temperatures
Model 7525 shows up to three parameters

Applications
Verify building HVAC system performance
Examine building IAQ conditions to optimize worker productivity
Comply with regulations and guidelines

Included Items
Instrument
Hard carrying case
Downloading software with cable
AC Adapter
NIST or EAL Calibration certificate
Operation and Service manual

Specifications
IAQ-CALC
Model 7525
CO2
Sensor Type Dual-wavelength NDIR (non-dispersive infrared)
Range 0 to 5000 ppm
Accuracy1 ±3.0% of reading or ±50 ppm, whichever is greater
Resolution 1 ppm
Response Time 20 seconds

Temperature
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
Sensor Type Thin-film capacitive
Range 5% to 95% RH
Accuracy2 ±3.0% RH
Resolution 0.1% RH
Response Time 20 seconds (for 63% of final value)

% Outside Air
Range 0 to 100%
Resolution 0.1%

Operating Temperature
40 to 113°F (5 to 45°C)

Storage Temperature
-4 to 140°F (-20 to 60°C)

Logging Capability
Model 7525 logs up to 30,300 data points with key (3) 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 (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
Four AA-size batteries or AC adapter

Included Items
Instrument
Hard carrying case
NIST or EAL Calibration certificate
Operation and Service manual

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).