COMET T3113D – 4-20mA Transmitter with 150 mm Duct Probe for Temperature and Humidity

COMET T3113D – 4-20mA Transmitter with 150 mm Duct Probe for Temperature –30 to +125 °C, Humidity 0–100 %RH, Dew Point, Galvanically Isolated, IP65 

The COMET T3113D is a professional 4–20 mA transmitter with an integrated 150 mm duct probe for temperature, relative humidity, and dew point – the ideal solution for precise climate measurement directly in the airflow of ventilation and air-conditioning systems (HVAC), air ducts, supply or exhaust systems, climate chambers, drying processes, or process air. With a galvanically isolated current output (4–20 mA) and excellent long-term stability, it is perfect for connection to PLCs, building management systems (BMS), controllers, recorders, or remote monitoring systems – even over long distances without signal loss.

The 150 mm probe extends deep into the duct and provides 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). The dew point is calculated internally (±1.5 °C for T<25 °C and RH>30 %). Additional humidity parameters are also available: absolute humidity, specific humidity, mixing ratio, and specific enthalpy. The output is freely scalable – you can 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 T3113D a reliable partner for demanding use in air ducts and ventilation systems (–30 to +80 °C). Galvanic isolation protects against ground loops and interference. The sensors feature long-term stability and are 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 T3113D is the professional duct T+RH transmitter:

• 150 mm duct probe – optimal measuring position in airflow
• Galvanically isolated 4–20 mA output – noise-immune & PLC-compatible
• 3-in-1: Temperature + Humidity + Dew Point – all humidity parameters available
• High accuracy – Temp. ±0.4 °C | Humidity ±2.5 %RH | Dew Point ±1.5 °C
• Free scaling – configurable via PC (measured variable & range)
• IP65 electronics + IP40 probe – for harsh duct environments
• Wide supply voltage – 9–30 V DC
• Long-term stable & maintenance-free – with calibration certificate

Technical data T3113D:

• 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 for 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: IP65 (electronics), IP40 (probe)
• Dimensions: 88.5 × 95 × 195 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 (supply air)
• Production and storage facilities
• 4–20 mA connection to PLC / BMS
• Demand-controlled ventilation
• Integration into existing analog systems

Mounting & commissioning – finished in minutes

Mount the device on the duct (hole Ø 25 mm), connect power (9–30 V DC) and the 4–20 mA loop – done! Configure the output (measured variable & range) via PC using COMET software. No recalibration required when replacing the unit.

Summary:

• Humidity and temperature transmitter
• For indoor and outdoor use
• Duct mounting
• Sensors for relative humidity and temperature (150 mm probe)
• Measured values are also converted to other humidity parameters: dew point temperature, absolute humidity, specific humidity, mixing ratio, specific enthalpy.

Scope of delivery:

• T3113D
• User manual
• Traceable calibration certificate
• Free TSensor software for transmitter configuration