COMET T6540 – WebSensor for CO₂, Temperature -30 to +80 °C, Humidity

COMET T6540 – Ethernet WebSensor for CO₂ 0–5000 ppm, Temperature –30 to +80 °C, Humidity 

The COMET T6540 is the professional Ethernet WebSensor (T-Line) for simultaneous measurement of CO₂ concentration, temperature, and relative humidity – equipped with integrated sensors and one of the best NDIR CO₂ modules on the market. As a true remote CO₂ monitor–thermometer–hygrometer, it is the ideal solution for modern indoor air quality monitoring in offices, schools, conference rooms, server rooms, production halls, hospitals, theaters, or anywhere good air quality is crucial for health, focus, and productivity.

The maintenance-free dual-wavelength NDIR sensor with multipoint calibration measures CO₂ precisely from 0 to 5000 ppm (±(50 ppm + 3 % of reading)) and can optionally be extended up to 10,000 ppm. The capacitive polymer sensor provides excellent long-term stability for temperature (–30 to +80 °C, ±0.6 °C) and humidity (5 to 95 %RH, ±2.5 %RH). All humidity parameters (dew point, absolute humidity, specific humidity, mixing ratio, specific enthalpy) are automatically calculated and immediately available.

The dual-line LCD optionally displays CO₂, temperature, humidity, or dew point and can be switched off during continuous operation. Via Ethernet (RJ45), the sensor integrates seamlessly into networks – with direct connection to the COMET Cloud (3 months free, then 1 credit/year) for charts, data exports, alarms, and remote access via app or browser. Alternatively, Modbus TCP, SNMP, JSON, or XML can be used for integration into your own SCADA/BMS/IoT solution.

The robust housing and operating temperature range from –30 to +80 °C make the T6540 a reliable partner for heavy-duty continuous operation, indoors or outdoors. No dedicated server is needed – the COMET Cloud handles all data processing.

Why the COMET T6540 is the professional CO₂ WebSensor:

• 3-in-1: CO₂ + temperature + humidity – with premium NDIR sensor
• Ethernet interface – direct network integration
• COMET Cloud included – 3 months free, then low-cost credit
• Protocols: Modbus TCP, SNMP, JSON, XML – open to third-party systems
• Dual-line LCD – switchable
• Highest precision – CO₂ ±(50 ppm + 3 %) | Temp. ±0.6 °C | Humidity ±2.5 %RH
• Dew point and all humidity parameters integrated
• Remote alarm function – e-mail, SNMP trap, Syslog
• Optional CO₂ range up to 10,000 ppm
• 3-year warranty

Technical data T6540:

• CO₂ measuring range: 0 to 5000 ppm (optional up to 10,000 ppm)
• CO₂ accuracy: ±(50 ppm + 3 % of reading)
• Temperature measuring range: –30 to +80 °C (±0.6 °C)
• Humidity range: 5 to 95 %RH (±2.5 %RH at 23 °C)
• Dew point: –60 to +80 °C (±1.6 °C at T<25 °C and RH>30 %)
• Resolution: 1 ppm / 0.1 °C / 0.1 %RH
• 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 offices
• Conference & meeting rooms
• Server rooms & data centers
• Hospitals & medical practices
• Production & storage halls
• Indoor air quality monitoring per DIN 1946-6
• Smart building & energy management

Setup – done in minutes

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

Summary:

• WebSensor for CO₂ concentration, temperature, and relative humidity with remote alarm
• Multi-stage adjustment process for CO₂ and temperature ensures excellent measurement accuracy across the entire temperature range
• Dual-wavelength NDIR technology automatically compensates for aging effects
• The CO₂ module is extremely resistant to contamination, maintenance-free, and offers outstanding long-term stability
• The two-line LCD display provides additional operating convenience
• Measured data are converted into various humidity parameters: dew point, absolute humidity, specific humidity, mixing ratio, and specific enthalpy
• The CO₂ concentration is displayed or indicated by a color LED.

Scope of delivery:

• T6540
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration
• COMET Cloud for 3 months
• Power adapter not included