COMET T5541 - WebSensor CO₂ Ethernet Cable Probe

COMET T5541 – Ethernet WebSensor with external CO₂ cable probe 0–10,000 ppm 

The COMET T5541 is a professional Ethernet WebSensor (T‑Line) for precise measurement of CO₂ concentration using an external cable probe – the ideal solution for flexible and accurate monitoring in rooms, ducts, climate chambers, production plants, warehouses, greenhouses, or any location where the measuring point cannot be directly at the device. The maintenance‑free dual‑wavelength NDIR sensor with multipoint calibration and automatic aging compensation ensures highly accurate measurement from 0 to 10 000 ppm (±(100 ppm + 5 % of reading) at 25 °C and 1013 hPa).

The external probe allows optimal placement – e.g. in ventilation ducts, confined areas, or critical points. CO₂ values are shown on the integrated display or indicated by a color LED – instantly visible to anyone in the room. 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, exports, alarm notifications, 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 (IP30 electronics, IP65 probe) and operating temperature range from –30 to +80 °C make the T5541 a reliable device for continuous operation – indoors or outdoors. No dedicated server required – COMET Cloud handles all data processing.

Why the COMET T5541 is the professional CO₂ WebSensor with cable probe:

• External cable probe – flexible positioning for challenging locations
• Extended CO₂ range 0–10 000 ppm – for demanding applications
• High‑precision NDIR sensor – dual‑wavelength technology with aging compensation
• Ethernet interface – direct network integration
• COMET Cloud included – 3 months free, then inexpensive credit
• Protocols: Modbus TCP, SNMP, JSON, XML – open to third‑party systems
• LED + display – color status signaling and live readings
• Remote alarm function – E‑mail, SNMP Trap, Syslog
• IP65 probe – ideal for humid & dusty environments
• 3‑year warranty

Technical data T5541:

• CO₂ measuring range: 0 to 10 000 ppm
• CO₂ accuracy: ±(100 ppm + 5 % of reading) at 25 °C and 1013 hPa
• Resolution: 1 ppm
• Measurement interval: 15 s
• Probe cable length: 1 meter
• 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 (electronics), IP65 (probe)
• Dimensions: 88.5 × 72.5 × 39.5 mm
• Weight: approx. 240 g
• Cable length: 1 meter
• Warranty: 3 years

Perfectly suited for:

• Ventilation & air‑conditioning systems (HVAC)
• Schools, offices & conference rooms
• Data centers & server rooms
• Production halls & warehouses
• Hospitals & medical facilities
• Indoor air quality per DIN 1946‑6
• Smart building & energy management
• Flexible measuring points with cable probe

Setup – ready in minutes

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

Summary:

• WebSensor with CO₂ probe on a cable
• Multi‑stage adjustment process for CO₂ and temperature ensures excellent measurement accuracy across the full temperature range
• Essential for process control and outdoor applications
• Dual‑wavelength NDIR CO₂ measurement automatically compensates for sensor aging
• The CO₂ module is highly resistant to contamination, maintenance‑free, and features excellent long‑term stability
• Device delivered with CO₂ probe and 1 m cable
• CO₂ concentration displayed on screen or indicated by color LED

Scope of delivery:

• T5541
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration
• COMET Cloud for 3 months
• Power adapter not included