COMET T3511 – Ethernet WebSensor for Temperature -30 to +105 °C and Humidity

COMET T3511 WebSensor T+RH Ethernet Cable Probe

The COMET T3511 is a professional Ethernet WebSensor (T-Line) for precise measurement of temperature and relative humidity – with a remote combination probe. As a true remote thermometer-hygrometer with Ethernet interface and external probe, it is the ideal solution for flexible monitoring in climate chambers, drying systems, maturation processes, data centers, clean rooms, greenhouses, or any application where the measuring point cannot be located directly at the device.

The high-precision capacitive polymer sensor ensures excellent long-term stability and accuracy. The probe measures temperature up to +105 °C and humidity from 0 to 100 %RH. In addition to the primary values, the T3511 automatically calculates all key humidity parameters: dew point, absolute humidity, specific humidity, mixing ratio, and specific enthalpy – all directly available through the integrated web interface or via Modbus TCP.

The large dual-line LCD can display temperature, humidity, or dew point and can be switched off during continuous operation. 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, Modbus TCP, SNMP, JSON, or XML can be used for integration into your own SCADA/BMS/IoT system.

The robust housing and operating temperature range of –30 to +80 °C (probe up to +105 °C) make the T3511 a reliable partner for demanding continuous operation – indoors or outdoors. The cable probe allows optimal placement of the measuring point – ideal for confined or hot areas.

Why the COMET T3511 is the professional WebSensor with cable probe:

• External cable probe – flexible for challenging installation locations
• 2-in-1: temperature + humidity – probe up to +105 °C
• Ethernet interface – direct network connection
• COMET Cloud ready – 3 months free, then low-cost
• Modbus TCP, SNMP, JSON, XML – open for third-party systems
• Large dual-line LCD – can be switched off
• High precision – Temperature ±0.4 °C | Humidity ±2.5 %RH
• All humidity parameters integrated – dew point directly available
• Remote alarm function – e-mail, SNMP trap, syslog
• IP65 housing – for demanding environments
• 3-year warranty

Technical data T3511:

• Temperature measurement range: –30 to +105 °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: 0.1 °C / 0.1 %RH
• 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
• Display: Dual-line LCD, switchable off
• Power supply: 9–30 V DC or PoE (optional)
• Protection rating: IP65
• Operating temperature: –30 to +80 °C

Perfect for:

• Building automation and BMS systems
• Climate chambers and drying systems
• Data centers and server rooms
• Clean rooms and pharmaceutical production
• Food storage and cold rooms
• Museums, archives, and repositories
• Production monitoring
• Environmental and climate monitoring

Installation & commissioning – done in minutes

Mount the electronic housing, place the probe at the desired measuring point, connect the network cable and power supply – done! The integrated web interface guides you through configuration. With COMET Cloud, you’ll be online in seconds – no server required.

Available variants:

• Cable length 1 meter
• Cable length 2 meters
• Cable length 4 meters

Summary:

• Ambient temperature and relative humidity T-Line WebSensor
• Remote alarm
• WebSensor with probe for relative humidity and temperature
• The high-precision capacitive polymer sensor ensures excellent long-term calibration stability and maximum accuracy
• The dual-line LCD display is another advantage
• The measured values are converted into additional humidity parameters: dew point temperature, absolute humidity, specific humidity, mixing ratio, and specific enthalpy
• The device is supplied with a T+RH probe.

Scope of delivery:

• T3511 – cable length depending on selection
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration
• COMET Cloud for 3 months
• Power supply not included