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CO2
Sensor Type Dual-wavelength NDIR
(non-dispersive infrared)
Range 0 to 5,000 ppm
Accuracy1 ±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 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 (Models 7525 and 7545)
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 (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
