COMET T3113 – 4-20mA Transmitter, Duct Probe for Temperature, Humidity, and Dew Point

COMET T3113 – 4-20mA Transmitter with 150 mm duct probe for temperature –30 to +125 °C, humidity 0–100 %RH, dew point 

The COMET T3113 is a professional 4-20mA transmitter with an integrated 150 mm duct probe for temperature, relative humidity, and dew point – the classic solution for precise measurement directly in the airflow of ventilation and air conditioning systems (HVAC), air ducts, climate chambers, drying systems, process air, or cleanrooms. With a galvanically isolated current output (4-20 mA) and high long-term stability, it is perfect for connection to PLCs, BMS systems, controllers, recorders, or remote monitoring – even over long distances without signal loss.

The 150 mm probe extends deep into the duct, ensuring representative readings even at high airflow velocities. Temperature is measured from –30 to +125 °C (±0.4 °C), humidity from 0 to 100 %RH (±2.5 %RH from 5–95 % at 23 °C). Dew point is calculated internally (±1.5 °C at T<25 °C and RH>30 %). In addition, all other humidity parameters are available: absolute humidity, specific humidity, mixing ratio, and specific enthalpy. The output is freely scalable – you define via PC the measuring range and which parameter (T, RH, Tdp, etc.) is transmitted.

The robust IP65 housing (electronics) and IP40 sensor make the T3113 a reliable choice for demanding duct and ventilation environments (–30 to +80 °C). Galvanic isolation protects against ground loops and interference. The probe offers excellent long-term stability and is available with a traceable calibration certificate (according to EN ISO/IEC 17025) – top quality for critical applications. Power supply 9–30 V DC – simple and flexible.

Why the COMET T3113 is the professional duct transmitter:

• 150 mm duct probe – optimal measuring position in the airflow
• Galvanically isolated 4-20mA output – interference-resistant and PLC-compatible
• 3-in-1: Temperature + Humidity + Dew point – all humidity parameters available
• High precision – Temp. ±0.4 °C | Humidity ±2.5 %RH | Dew point ±1.5 °C
• Freely scalable – configurable via PC (parameter & range)
• IP65 electronics + IP40 probe – for harsh duct environments
• Wide power supply range – 9–30 V DC
• Long-term stable and maintenance-free – with calibration certificate

Technical data T3113:

• Temperature range: –30 to +125 °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 %)
• Output: 4-20 mA, galvanically isolated
• Resolution: 0.1 °C / 0.1 %RH
• Probe length: 150 mm
• Power supply: 9–30 V DC
• Operating temperature: –30 to +80 °C
• Protection rating: IP65 (electronics), IP40 (probe)
• Dimensions: 88.5 × 250 × 39.5 mm
• Weight: approx. 150 g
• Warranty: 3 years

Perfectly suited for:

• Ventilation and air conditioning systems (HVAC)
• Air ducts and supply air measurement
• Climate chambers and drying systems
• Data centers and server rooms
• Production and storage halls
• Cleanrooms and pharmaceutical production
• 4-20mA connection to PLC / BMS systems
• Demand-controlled ventilation

Installation & commissioning – done in minutes

Mount the device to the duct (hole Ø 25 mm), connect power (9–30 V DC) and 4-20mA loop – done! Configure the output via PC (COMET software): select parameter and range. No recalibration required when replacing the probe.

Summary:

• Temperature and humidity transmitter
• For indoor and outdoor applications
• Duct installation
• Sensors for relative humidity and temperature (150 mm probe). Measured values are also converted into other humidity variables: dew point temperature, absolute humidity, specific humidity, mixing ratio, specific enthalpy.

Scope of delivery:

• T3113
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration