AZ7201
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AZ7755
AZ7755
NDIR CO₂ + T/RH handheld, TWA/STEL, fresh-air cal, USB output.
Reference price: USD 196.00
Frequently Asked Questions
Why does the 7755 use NDIR technology?
NDIR (Non-Dispersive Infrared) waveguide technology provides stable, accurate CO₂ readings without interference from alcohol, perfumes, or other VOCs.
What is TWA and STEL?
TWA (Time-Weighted Average): 8-hour average exposure. STEL (Short-Term Exposure Limit): 15-minute average exposure. Both are displayed on the 7755.
How is CO₂ calibration done?
Easy manual calibration in fresh air. The RH sensor can be calibrated with AZ 33%/75% salt bottle.
What parameters are displayed?
Triple displays: CO₂ level, temperature, and humidity. Dual display mode shows 2 parameters simultaneously (e.g., CO₂ + temp).
Does it have an audible alarm?
Yes, audible CO₂ level warning alarm with adjustable threshold.
What is the CO₂ range?
0–9999 ppm (guaranteed accuracy 0–2000 ppm).
Does it have a backlight?
Yes, backlight for working in dark areas.
Specifications
Technical parameters
| CO₂ | 0–9999 ppm |
|---|---|
| Acc | ±50ppm±5 % |
| T | -10~60 ℃ |
| RH | 0.1~99.9 % |
| NDIR sensor | . |
| TWA/STEL | . |
| Backlight | . |
| Power | AA×4 . |
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