AHT-503H Remote Temperature & Humidity Transmitter

Industrial-Grade HVAC Monitoring for Remote and Compact Installations

The AHT-503H Remote Probe model is a high-performance temperature and humidity transmitter designed for confined spaces, sealed chambers, and high-moisture environments where direct sensor placement isn’t possible. The sensing element is mounted on a separated metal probe, allowing the transmitter body to remain outside of the monitored space for easy access and protection.

Equipped with CMOSens® MEMS sensor technology and housed in an IP65-rated enclosure, this model delivers accurate, long-term measurement for cold chain monitoring, smart agriculture, and industrial control systems in Australia’s demanding climates.

With multiple output options including analog (4–20 mA / 0–10 V) and Modbus RTU over RS-485, the AHT-503H integrates seamlessly with SCADA, BMS, and HVAC infrastructure.

Key Features

• Measures both Temperature and Relative Humidity (RH)
• Remote metal probe for installation in sealed or compact areas
• High-accuracy CMOSens® MEMS sensing element
• IP65-rated transmitter housing
• Flexible cable between sensor and transmitter for easy mounting
• 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 on transmitter
• CE & FCC Certified
  

Applications

• Cold room & freezer monitoring
• Smart agriculture (e.g. mushroom farms, vertical farms)
• Food production and refrigerated logistics
• Energy monitoring in sealed compartments
• HVAC/BMS where probe needs to be isolated from controller

Available Variants