Indoor Air Quality Meter TSI Model 7545

Features

CO₂:
Sensor Type: Dual-wavelength NDIR
(non-dispersive infrared)
Range Accuracy¹: 0 to 5,000 ppm
±3.0% of reading or ±50 ppm, whichever is greater
Resolution Response: 1 ppm
Time: 20 seconds

CO:
Sensor Type: Electro-chemical
Range: 0 to 500 ppm
Accuracy: +3% of reading or +3ppm
Whichever is greater
Resolution: 0.1 ppm
Response time: <60 seconds to 90% step change

Temperature:
Sensor Type: 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 (90% of final value, air velocity at 2 m/s [400 ft/min])

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)

Percentage Outside Air:
Range: 0 to 100%
Resolution: 0.1%

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

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

Logging Capability:
Range: 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:
8.4 cm x 17.8 cm x 4.4 cm
(3.3 in. x 7.0 in. x 1.8 in.)

Probe Dimensions:
Length 17.8 cm (7.0 in.)
Diameter 1.9 cm (0.75 in.)

1 Accuracy with probe at 25°C (77°F). Add uncertainty of ±0.36%/°C (±0.2%/°F) away from calibrated temperature.
2 Accuracy with probe at 25°C (77°F). Add uncertainty of ±0.2% RH/°C (±0.1% RH/°F) away from calibrated temperature. 

Associated services

. First level maintenance and repair work performed by Aerometrik.

. Taking charge of and monitoring the metrology of this equipment with TSI.