AHT-503H Duct-Mount Temperature & Humidity Transmitter

Industrial-Grade HVAC Monitoring for High-Humidity Air Ducts

The AHT-503H Duct Mount model is a precision temperature and humidity transmitter built for harsh Australian HVAC environments such as air handling units, mechanical rooms, and high-condensation ductwork. Designed with CMOSens® MEMS sensing technology and an encapsulated sintered metal probe, it delivers long-term accuracy and resistance to airborne moisture, dust, and particulate matter.

Protected in an IP65-rated enclosure and built to handle the extreme humidity often found in subtropical and industrial settings across Australia, this sensor is ideal for high-performance building automation systems, smart ventilation zones, or mechanical services applications.

With support for analog outputs (4–20 mA / 0–10 V) and Modbus RTU over RS-485, it integrates easily with Australian BMS platforms and energy monitoring infrastructure.

Key Features

• Measures both Temperature and Relative Humidity (RH)
• Duct-mount design with encapsulated sintered metal sensor
• High-accuracy CMOSens® MEMS sensing element
• IP65-rated enclosure for dust and splash protection
• Maintenance-free for HVAC and mechanical room environments
• 3 Switchable Temp Ranges: 0~50°C, -50~50°C or 0~100°C
• Multiple output options:
  ▸ Analog: 4–20 mA / 0–10 V / 0–5 V / 1–5 V
  ▸ Digital: Modbus RTU via RS-485
• Optional LCD display for real-time monitoring
• CE & FCC Certified
  

Applications

• HVAC ducts & ventilation shafts
• Air handling units (AHUs)
• Chiller room monitoring
• Energy platforms & BMS integrations
• Indoor agriculture & humidity-critical HVAC zones

Available Variants

Note: This product is customizable and can be built to order.
Please refer to the datasheet below for specifications and available configurations.

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Downloads:

• Datasheet