Principle of Operation

The ALTA Wireless Carbon Dioxide Sensor measures the amount of CO2 in the ambient air surrounding the element. It is programmed to take readings at a set interval to accurately calculate CO2 levels, then send the time-stamped data to the iMonnit Online Sensor Monitoring and Notification System at user-specified time intervals (sensor heartbeat). The CO2 data can be reviewed and exported as a data sheet or graph and notifications can be set up through the online system to alert the user when defined thresholds have been met or exceeded.

Example Interfacing

  • Indoor air quality
  • Greenhouses
  • Cellar and gas stores
  • Marine vessels
  • Modified atmospheres
  • Landfill gas
  • Confined spaces
  • Cryogenics
  • Ventilation management 

Features of Monnit ALTA Sensors

  • Wireless range of 1,200+ feet through 12+ walls *
  • Frequency-Hopping Spread Spectrum (FHSS)
  • Improved interference immunity
  • Improved power management for longer battery life **
  • Encrypt-RF ® Security (Diffie-Hellman Key Exchange + AES-128 CBC for sensor data messages)
  • Datalogs 2000 to 4000 readings if gateway connection is lost (non-volatile flash, persists through the power cycle):
  • 10-minute heartbeats = ~ 22 days - 2-hour heartbeats = ~ 266 days
  • Over-the-air updates (future proof)
  • Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email Wireless Range Comparison

*Actual range may vary depending on environment. **Battery life is determined by sensor reporting frequency and other variables. Other power options are also available.

ALTA AA Wireless Carbon Dioxide CO2 Sensor

Technical Specifications

ALTA Industrial Wireless Carbon Dioxide Co2 Sensor

Supply Voltage 2.0-3.8 VDC (3.0-3.8 VDC using power supply) *
Current Consumption 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle), 2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio TX mode) 
Operating temperature range (board circuitry and battery)  0°C to 50°C (32°F to 122°F) standard range
Sensing Method Non-dispersive infrared (NDIR) absorption
Gold-plated optics
Solid-state source and detector
Sample Method Diffusion
Range 0 to 10000 ppm CO2
Accuracy ± ((45 ppm + 3%) * (1 + .0013 * deltaP)) ** 
Datalogging Datalogs up to 3200 sensor messages
Wireless Range 1,200+ ft non-line-of-sight 
Security Encrypt-RF ® (256-bit key exchange and AES-128 CTR) 
Weight 4.5 ounces 
Certifications 900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-G2SC1. 868 and 433 MHz product tested and found to comply with: EN 300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02) and EN 60950

*Hardware cannot withstand negative voltage. Please take care when connecting a power device.

** deltaP is in mbar and is the difference between atmospheric pressure at sea level (1013 mbar) and the pressure at the sensors altitude (Ex: 1013 mbar ? ambient pressure in mbar).

*** For correct autocalibration, the sensor must experience fresh air CO2 levels (~400 ppm) for at least 4 hours per day. If the environment does not meet this criteria then disable the autocalibration feature


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