IAQ-Calc 7545 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
Electrochemical sensor measures CO
Model 7545 shows up to three parameters

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

Specifications
Specifications are subject to change without notice.
CO2:
Range: 0 to 5000 ppm
Accuracy1: ±3% of reading or ±50 ppm, whichever is greater
Resolution: 1 ppm
Sensor type: Non-Dispersive Infrared (NDIR)

CO Sensor:
Range: 0 to 500 ppm
Accuracy: ±3% of reading or ±3 ppm, whichever is greater [add
±0.28%/F (±0.5%/C) away from calibration temperature]
Resolution: 0.1 ppm
Response time: <60 seconds to 90% of final value.
Sensor type: Electro-chemical

Temperature:
Range: 32 to 140F (0 to 60C)
Accuracy2: ±1.0F (±0.6C)
Resolution: 0.1F (0.1C)
Response time: 30 seconds (90% of final value, air velocity at 2 m/s)
Display units: F or C (user selectable)
Type: Thermistor

Humidity:
Range: 5 to 95% RH
Accuracy2: ±3.0% RH (includes ±1% hysteresis)
Resolution: 0.1% RH
Response time: 20 seconds (for 63% of final value)
Sensor type: Thin-film capacitive

Instrument Temperature Range:
Operating (Electronics): 40 to 113°F (5 to 45°C)
Storage: -4 to 140°F (-20 to 60°C)

Instrument Operating Conditions:
Altitude up to 4000 meters
Relative humidity up to 80% RH, non-condensing
Pollution degree 1 in accordance with IEC 664
Transient over voltage category II

Data Storage Capabilities:
Range: 26,900 data points with key (4) measured parameters
Enabled

Logging Interval:
Intervals: 1 second up to 1 hour (user selectable)

Time Constant:
Intervals: 1 sec, 5 sec, 10 sec, 20 sec, 30 sec (user selectable)

External Meter Dimensions:
3.3 in. x7.0 in.x 1.8 in. (8.4 cm x 17.8 cm x4.4 cm)

Meter Probe Dimensions:
Probe length: 7.0 in. (17.8 cm)
Probe diameter of tip: 0.75 in. (1.9 cm)

Meter Weight:
Weight with batteries: 0.6 lbs (0.27 kg)

Power Requirements:
Four AA-size batteries (included) or AC adapter (optional) 9 VDC, 300 mA,
4-18 watts (input voltage and frequency vary depending on which adapter is
used)

Included Items
Instrument
Hard carrying case
Downloading software with cable
AC Adapter
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).