carbon dioxide sensors

CO2Meter K-30-SE-0018_1Part Numbers:

  • ESSE-18 – K30 10,000ppm (1%) CO2 Sensor
  • ESSE-118 – K30 100,000ppm (10%) CO2 Sensor
  • ESSE-20 – K33 Data Logging CO2, Temperature and Relative Humidity Sensor Kit
  • B-530 – CO2 HVAC and IAQ Sensor
  • B-530G – CO2 Greenhouse Sensor




ESSE-18/118 K30 CO2 sensor – 1% and 10% models

K30 CO2 SensorThe K30 Sensor Module is a maintenance-free transmitter module intended to be built into different host devices that require CO2 monitoring data. It is an accurate, yet low-cost solution for OEMs who want to integrate CO2 sensing into their products. The compact size, low-power requirements and multiple output options are intended to be easily implement into analog or microprocessor-based controls and equipment.

The sensor may be customized in order to optimize the total system with respect to the OEM application. For example, the K30 can be used in

  • Scientific experiments
  • IAQ sensor housings
  • Alarm sensor housings
  • Fresh air ventilators
  • Combustion controls

The only restriction for this product is your creativity and inventiveness.

The K30 is aimed at high volume production. For a moderate start-up cost this product can be tailored to meet the your unique requests. Contact us directly for wholesale pricing on large quantities of this sensor.

  • Operating Environment: Residential, commercial, industrial spaces and potentially dusty air ducts used in HVAC (Heating Ventilation and Air-Conditioning) systems
  • Simple to install, pre-calibrated and ready-to-use
  • compact, low cost
  • maintenance free in normal IAQ applications
  • flexible through advanced digital technology 
  • Development kit for fast prototypes


optional accessories

Pump Kit (Mobile)I2C to USB Sensor Communication Cable

Sample Draw Pump Kit: Download ESCM-111-pump-kit Spec Sheet

  • CO2 Measurement: non-dispersive infrared (NDIR)
  • Measurement Range: 0 – 10,000 ppm (1%) (0-5,000 ppm within specifications); or 0 – 100,000 ppm (10%)
  • Rate of Measurement: 2 seconds
  • Response Time: 20 seconds diffusion time; 2 seconds @ .5 l/min tube gas flow
  • 4 outputs. 2 analog/ digital selectable and 2 digital only.
  • Scalable Analog voltage outputs
  • Each digital output has threshold and hysteresis
  • Programmable Range: 0-10,000 ppm (custom configuration required)
  • Repeatability: ± 20 ppm ± 1 % of measured value within specifications
  • Accuracy: ± 30 ppm ± 3 % of measured value within specifications
  • Sensor Life Expectancy: > 15 years
  • Maintenance Interval: no maintenance required
  • Self-Diagnostics: complete function check of the sensor module
  • Warm-up Time: < 1 min. (@ full specs < 15 min)
  • ABC (Automatic Background Calibration enabled (unless specified OFF))
  • Dimensions: 51 × 57 × 14 mm (Length x Width x approximate Height)
  • Power Input: 5.5-14 VDC, stabilized to within 10% (external protection circuits required)
  • Current Consumption: 40 mA average
  • Sampling Method: diffusion
conforms with standards
  • Emission: EN61000-6-3:2001
  • Immunity: EN61000-6-2:2001
  • RoHS directive 2002/95/EG
  • 90 days


manual and additional documents

ESSE-18 K30 CO2 Sensor Manual

ESSE-18 K30 CO2 Sensor Dimensional Drawings




ESSE-20 – K33 Data Logging CO2, Temperature and Relative Humidity Sensor Kit

CO2Meter CM-0026_K33_ELG_CO2_Data_Logger_Sensor_Development_KitThe ESSE-20 K33 Kit is designed to measure up to 10,000ppm (1%) carbon dioxide, temperature, and relative humidity in remote locations. Because of its ultra-low power requirements, it can “wake up”, take a sample, store the data in memory, and go back to sleep. Using battery power only, the sensor can be placed in the field for days or weeks at a time.

The ESSE-20 K33 Kit consists of the K30 CO2 Sensor (see above), data logger, temperature sensor, relative humidity sensor, battery pack, communication cable and software.

With multiple input and output options and support for I2C and Modbus protocols over TTL levels, the K33 ELG combines the quality of our dual infrared NDIR sensor technology with configuration options to satisfy even the most critical applications.


GasLab® software

CO2Meter GasLab_grande (Mobile)This device uses GasLab® software for setup, calibration, data logging, and real-time data analysis. GasLab® makes it easy to export data into a .CSV file that can be imported into any industry-standard software or spreadsheet. GasLab® runs on Windows XP or higher, and free to use with our products.


example application

Why you need to measure CO2 inside buildings


  • CO2 Measurement: non-dispersive infrared (NDIR)
  • CO2 Range: 0 – 10,000 ppm
  • CO2 Accuracy: ± 30ppm ± 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
  • Sampling Method: diffusion
  • Data logging: 30 seconds to 18 hours sample interval for CO2, RH & T
  • Optional: 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
  • Power Input: 6-14 VDC max rating, stabilized to within 10%
  • Dimensions: 2.0 × 2.25 × 0.5 inches

90 days


manual and additional documentation

ESSE-20 K33 Kit Manual



B-530 and B-530G CO2 sensor modules

ELT B-530GThe B-530 and B-530G CO2 sensor modules are ideal for measuring atmospheric CO2 concentrations. The sensor can be easily integrated into your existing equipment or one of our engineers can assist with integration.

The B-530 is suited low humidity environments such as buildings, HVAC and IAQ. The B-530G can be installed in environments with relative humidity to 99%. The B-530G is ideal for mushroom house and greenhouses that need robust and reliable sensor technology. The B-530G contains silicon coating and membrane filter to protect against moisture ingress.

The B-530 and B-530G are maintenance free and low cost. The sensors simultaneously transmit a calibrated digital and analog output signal. Its compact size and low power consumption makes easy to be integrated into a broad range of equipment.


  • Sensing Method: NDIR (Non-dispersive Infrared) (read article on NDIR explained)
  • Measurement Range: 0 to 2,000/3,000/5,000/10,000/50,000ppm (Optional for B-530 module only)
  • Accuracy: ±30ppm and ±3% of measured value
  • Response Time (90%): 120 sec
  • Operating Temperature Range: B-530: 0 ~ 50℃; B-530G: -10 ~ 60℃
  • Operating Humidity Range: B-530: 0 ~ 95% (Non-condensing); B-530G: 0 ~ 99% (Non-condensing)
  • Storage Temperature: -30℃ ~ 70℃
  • Input Power: 9~15 VDC (±2% Regulation)
  • Power Consumption: Normal : 35mA /Max. 300mA
  • Output Connector: 3pin/7pin (Molex 053015)
  • Digital Output: UART/Asynchronous-serial, TTL Level, 38, 400bps
  • Analog Output: VDC 0.5 ~ 4.5V (linear output)
  • Size: – 65mm x 50mm x 20mm

Download B-530 Data Sheet

Download B-530G Data Sheet