COMET H6520 – Sensor for CO₂, Temperature, Humidity, Dew Point + 2 Relay Outputs

COMET H6520 – Ethernet Sensor for CO₂ 0–5000 ppm, Temperature –30 to +80 °C, Humidity, Dew Point + 2 Relay Outputs

The COMET H6520 is a professional Ethernet sensor equipped with an integrated NDIR CO₂ module, temperature and humidity sensors, and two powerful relay outputs. It is the ideal all-in-one solution for smart indoor air monitoring and direct control in offices, schools, conference rooms, server rooms, production halls, hospitals, theatres, or any location requiring precise CO₂, temperature, and humidity regulation.

The maintenance-free dual-wavelength NDIR sensor with multipoint calibration and automatic aging compensation measures CO₂ accurately from 0 to 5000 ppm (±(50 ppm + 3% of reading) at 25 °C and 1013 hPa), with an optional extension up to 10,000 ppm. The capacitive polymer sensor ensures excellent long-term stability for temperature (–30 to +80 °C, ±0.4 °C) and humidity (0 to 100 %RH, ±2.5 %RH from 5–95 % at 23 °C). The dew point is calculated with high precision (±1.5 °C at +10 °C and higher). All humidity parameters are available instantly.

The two relay outputs (max. 50 V / 2 A) can be freely configured by CO₂, temperature, or humidity thresholds – ideal for direct control of fans, humidifiers, dehumidifiers, alarms, or emergency shutdown systems. The large dual-line LCD displays all measured values and relay statuses. Additionally, the CO₂ concentration is indicated via a color LED, making room air quality immediately visible to occupants.

Via Ethernet (RJ45), the sensor integrates seamlessly into networks, with direct connectivity to the COMET Cloud (3 months free, then 1 credit/year) for charts, exports, alarms, and remote access via app or browser. Alternatively, use Modbus TCP, SNMP, JSON, or XML for your own BMS/SCADA/IoT solution. Its robust housing and operating temperature range of –30 to +80 °C make the H6520 a reliable partner for continuous operation – indoors or outdoors.

Why the COMET H6520 is the professional CO₂ sensor with relays:

• 3-in-1: CO₂ + Temperature + Humidity – with premium NDIR sensor
• 2 relay outputs – 50 V / 2 A – for direct control
• Ethernet interface – direct network connection
• COMET Cloud ready – 3 months free, then low-cost
• Modbus TCP, SNMP, JSON, XML – open to third-party systems
• Dual-line LCD + color LED – display and status indication
• High accuracy – CO₂ ±(50 ppm + 3%) | Temp. ±0.4 °C | Humidity ±2.5 %RH
• Dew point and all humidity parameters integrated
• Remote alarm function – E-mail, SNMP Trap, Syslog

Technical Data H6520:

• CO₂ measuring range: 0 to 5000 ppm
• CO₂ accuracy: ±(50 ppm + 3% of reading) at 25 °C and 1013 hPa
• Temperature range: –30 to +80 °C (±0.4 °C)
• Humidity: 0 to 100 %RH (±2.5 %RH from 5–95 % at 23 °C)
• Dew point: –60 to +80 °C (±1.5 °C at T<25 °C and RH>30%)
• Resolution: 1 ppm / 0.1 °C / 0.1 %RH
• Relays: 2 × max. 50 V / 2 A
• Interface: Ethernet (RJ45)
• Cloud: COMET Cloud (3 months free)
• Protocols: WWW, Modbus TCP, SNMPv1, SOAP, XML
• Alarm protocols: E-mail, SNMP Trap, Syslog
• Power supply: 9–30 V DC (PoE optional)
• Operating temperature: –30 to +80 °C
• Protection class: IP30
• Warranty: 3 years

Perfectly suited for:

• Schools, kindergartens & lecture halls
• Offices & open-plan workplaces
• Conference & meeting rooms
• Server rooms & data centers
• Hospitals & medical facilities
• Production & storage halls
• Demand-controlled ventilation systems
• Smart building & energy management

Setup – done in minutes

Connect the network and power cables, assign an IP address via DHCP or manually – done! The integrated web interface guides you through setup and relay configuration. With COMET Cloud, you are online in seconds – no server required.

Summary:

• Temperature, humidity, and CO₂ sensor with two relay outputs
• Humidex display
• The H6520 sensor is designed for online monitoring of temperature, relative humidity, and CO₂ concentration in non-aggressive air environments
• Other devices can be controlled via the two relay outputs
• The high-precision capacitive polymer sensor ensures excellent long-term calibration stability and maximum accuracy
• Measured values are converted into other humidity parameters: dew point temperature, absolute humidity, specific humidity, mixing ratio, and specific enthalpy
• The CO₂ measurement is based on a dual-beam, dual-source method
• The proven non-dispersive infrared (NDIR) sensor cell ensures long-term CO₂ measurement stability
• The patented autocalibration process compensates for infrared source aging, ensuring high reliability and long-term accuracy
• No regular on-site recalibration is required
• The CO₂ concentration is displayed on the screen or indicated via a color LED.

Scope of Delivery:

• H6520
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration
• COMET Cloud access for 3 months
• Power supply not included