Duct Air Temperature & Humidity Transmitter | 4–20 mA HVAC Probe
A high-accuracy duct-mounted temperature and humidity transmitter with stainless steel probe and 4–20 mA outputs. Purpose-built for HVAC air ducts, delivering fast response, excellent linearity, and long-term stability.
This duct RH/temperature transmitter is engineered for precise monitoring inside HVAC air ducts and ventilation systems. It combines a PT1000 Class-A temperature sensor with a capacitive humidity element, supported by an IC processor and temperature-compensated amplification to convert measurements into stable industrial signals.
The 304 stainless steel probe ensures durability and corrosion resistance, while the sealed PC enclosure protects electronics against moisture ingress. Compact, lightweight construction enables easy installation on air handling units (AHUs) and ductwork. With fast response and strong anti-interference performance, the device is ideal for continuous control and monitoring in building automation.
Key Applications
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HVAC air duct systems and AHUs
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Building Management Systems (BMS)
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Data centres and communications rooms
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Hospitals, laboratories, and cleanrooms
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Industrial ventilation and process air monitoring
Compliance & Design Considerations
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Industrial sensing with temperature compensation and linearisation
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4–20 mA current loop for noise-immune transmission
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Stainless steel probe suitable for duct environments
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Designed for ISO-aligned HVAC monitoring and control
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Environmentally safe construction (no hazardous chemicals)
