COMET P0122 – 4-20mA Transmitter with 120 mm Duct Probe for Temperature Measurement from -30 to +80 °C

COMET P0122 – 4-20mA transmitter with 120 mm duct rod probe for temperature –30 to +80 °C, IP65, galvanically isolated 

The COMET P0122 is a robust 4-20mA temperature transmitter with an integrated 120 mm duct rod probe – the classic solution for precise temperature measurement directly in the airflow of ventilation and air-conditioning systems (HVAC), air ducts, supply or exhaust systems, climate chambers, or process air. With a galvanically isolated current output (4-20 mA) and high long-term stability, it is ideal for connection to PLCs, building control systems, controllers, data loggers, or remote monitoring systems – even over long distances without signal loss.

The internal temperature sensor measures from –30 to +80 °C with an accuracy of ±0.4 °C and high resolution (0.1 °C). The 120 mm rod probe extends deep into the duct and provides representative readings even at high airflow velocities. The output is freely scalable – you can define the measuring range and output value via PC (e.g. 4 mA = –30 °C, 20 mA = +80 °C). The weatherproof IP65 enclosure makes the P0122 a reliable partner for demanding use in ducts and ventilation systems (–30 to +80 °C).

The galvanic isolation protects against ground loops and interference. The sensor offers 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 (typical 24 V) – simple and flexible. No external probe required – all-in-one device for quick installation and minimal error sources.

Why the COMET P0122 is the professional duct temperature transmitter:

• 120 mm duct rod probe – optimal measuring position in the airflow
• Galvanically isolated 4-20mA output – interference-proof and PLC-compatible
• High precision – ±0.4 °C from –30 to +80 °C
• Freely scalable – configurable via PC (measuring range and output)
• IP65 housing – weatherproof for outdoor and duct installation
• Wide power supply range – 9–30 V DC (typical 24 V)
• Long-term stability and maintenance-free – with calibration certificate

Technical data P0122:

• Temperature measuring range: –30 to +80 °C (±0.4 °C)
• Resolution: 0.1 °C
• Output: 4-20 mA, galvanically isolated
• Probe length: 120 mm
• Power supply: 9–30 V DC (typical 24 V)
• Operating temperature: –30 to +80 °C
• Protection rating: IP65
• Dimensions: 88.5 × 94 × 160 mm
• Weight: approx. 140 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 halls
• 4-20mA connection to PLC/BMS
• Demand-controlled ventilation
• Integration into existing analog systems

Installation & commissioning – done in minutes

Mount the device onto the duct (hole Ø 25 mm), connect power (9–30 V DC) and 4–20 mA loop – done! Configure the output via PC (COMET software) for measuring range and output value. No calibration required when replacing the device.

Summary:

• Remote transmitter with temperature sensor on 120 mm probe
• Suitable for indoor and outdoor use
• Integrated temperature sensor

Scope of delivery:

• P0122
• User manual
• Traceable calibration certificate