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30% CO2/Temp/RH Data Logging Sensor

30% CO2/Temp/RH Data Logging Sensor

Inquiry Catalog



The K-33 BLG (bio-logger) sensor is designed to measure percentage of carbon dioxide up to 30%, as well as temperature and humidity. This makes it an excellent sensor for enclosed applications like incubators.

The K-33 BLG sensor has two 3 mm tube fittings for remote draw or pump sampling measurement. Easily remove the tube cap to use it as a diffusion sensor. Because of its ultra-low power requirements, it can be battery powered to log data to its internal memory.

With multiple input and output options, and support for I2C and Modbus protocols over TTL levels, the K-33 BLG combines the quality of our dual infrared NDIR sensor technology with configuration options to satisfy any remote data logging application.


CO2 Measurement: non-dispersive infrared (NDIR)
Sampling Method: tube-in / tube out (optional sampling method: diffusion)
CO2 Range: 0 – 30% CO2
CO2 Accuracy: ± 0.2% vol CO2 ± 3% of measured value
Temperature Range: -40 to 60C
Temperature Accuracy: ± 0.4C at 25C
Relative Humidity Range: 0-100% RH non condensing
Relative Humidity Accuracy: ± 3% RH
Data logging: 30 seconds to 18 hours sample interval
Support for real-time measurement with software
Memory: 5,400 log entries maximum, includes time stamp, co2, temp, RH. 1 additional analog input to the log available
Sensor Life Expectancy: > 15 years
Maintenance Interval: no maintenance required
Self-Diagnostics: complete function check of the sensor module

Electrical / Mechanical
Power Input: 6-14 VDC max rating, stabilized to within 10%
Dimensions: 2.0 × 2.25 × 0.88 inches (0.62 inches w/o tube adapter)

90 days