eSense Low-Temperature CO2 Transmitter

eSense Low-Temperature CO2 Transmitter
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  • Measure CO2 as low as -22°F
  • Built-in Heating Element
  • IP65 Outdoor Rated Housing

The eSense Low-Temperature CO2 Transmitter is designed to measure ambient CO2 levels outdoors in any weather. The heating element maintains a constant temperature for both the sensor and air sample, giving consistent measurements over time.

The use of outdoor CO2 measurement as a baseline measure to compare against indoor CO2 levels for LEED points is referenced in the LEED standard for Outdoor Air Delivery Monitoring EQ1.2.

The transmitter uses an IP65-rated housing with a built-in heater. The heater insures that gas samples entering the CO2 sensors are not only warm enough for sensing but also at the correct moisture level. The CO2 levels are then read by the NDIR carbon dioxide sensor, and transmitted via industry standard 0-10V or 4-20mA signals to an HVAC system.

The eSense uses a built-in self-correcting algorithm called ABC (Automatic Baseline Correction). This algorithm constantly keeps track of the sensor’s lowest reading over several days and corrects for long-term drift.


  • Analog Output O-10v or 4-20mA (0-2,000ppm)
  • -22 to +115°F
  • Automatic Self-Diagnostics
  • Maintenance-free in Normal Applications


  • Output: 0-10V = 0-2,000 ppm CO2
  • Response Time (T1/e) < 30 sec. @ 30 cc/min. flow rate, < 3 min. diffusion time
  • Repeatability ± 20 ppm ± 1 % of reading
  • Accuracy ± 30 ppm ± 3 % of reading
  • Annual Zero Drift < ± 10 ppm
  • Meets ISO 12039 Standard for NDIR detection of CO2
  • Protection Class IP65
  • Sensor Life Expectancy: 15 years

Electrical Requirements

  • 24 VAC/VDC
  • < 1 Watt average (heater off)


  • 1 Year

Data Sheet (pdf)

Manual (pdf)

Calibration Procedure (pdf)

CE & EMC Certificate (pdf)