Comet H5021 – CO2 Concentration Meter with Two Relays

The Comet H5021 is the reliable CO₂ transmitter with two relay outputs and an integrated LED traffic light function (green/yellow/red). With an external probe and high accuracy – ideal for indoor air monitoring, schools, offices and industry.

The Comet H5021 is a professional CO₂ concentration transmitter with two relay outputs. The device was developed for the reliable monitoring of indoor CO₂ concentration and clearly displays air quality via an integrated LED traffic light function.

The green LED lights up from 0 to 1000 ppm, the yellow LED from 1001 to 1200 ppm and the red LED from 1201 ppm onwards. In addition to the relay outputs, the device enables the control of external devices such as ventilation systems or alarms directly when preset limit values are exceeded.

The H5021 is supplied with an external CO₂ probe with a 1-meter cable. The robust IP65 housing makes the device suitable for use in demanding environments.

Why the Comet H5021 is the best CO₂ transmitter:

• Integrated LED traffic light function (green/yellow/red)
• Two independent relay outputs
• Measuring range up to 10,000 ppm CO₂
• High measuring accuracy
• External probe with 1-meter cable
• IP65 protection class
• Easy configuration with TSensor software
• Traceable calibration certificate
• Robust housing for industry and buildings
• Reliable indoor air quality monitoring

Technical Data:

• CO2 measuring range: 0 to 10,000 ppm
• CO₂ accuracy: ±(100 ppm + 5% of the measured value)
• Resolution: 1 ppm
• Relay outputs: 2 pieces (50 V / 2 A)
• LED display: Green (0-1000 ppm), Yellow (1001-1200 ppm), Red (from 1201 ppm)
• Operating voltage: 9-30 V DC
• Operating temperature: -30 to +60 °C
• Protection class: IP65
• Dimensions: 136 x 150 x 45 mm
• Weight: approx. 360 g

Delivery Volume

• H5021 CO₂ transmitter
• External CO₂ probe with 1-meter cable
• Operating manual
• Traceable calibration certificate
• Free configuration software TSensor
• NO power supply included