The Johnson Controls ST-D24 is a precision duct mount thermistor engineered for accurate air temperature sensing in commercial and industrial HVAC systems. Featuring a robust 8-inch stainless steel probe, this sensor delivers reliable performance across a wide operating temperature range, making it an ideal choice for air handling units, VAV systems, and building automation applications.
Key Features
- Duct mount design for direct installation into supply, return, or mixed-air ductwork
- 10K Ohm thermistor resistance for compatibility with a broad range of building automation and DDC controllers
- 8-inch stainless steel probe for durability and corrosion resistance in demanding duct environments
- Wide operating temperature range of -40°F to 221°F (-40°C to 105°C) for versatile HVAC applications
- Designed for seamless integration with Johnson Controls and compatible BAS/DDC control systems
Applications
- Air handling units (AHUs)
- Variable air volume (VAV) systems
- Commercial ductwork temperature monitoring
- Building automation and direct digital control (DDC) systems
- Supply, return, and mixed-air duct sensing
Specifications
- SKU: ST-D24
- Brand: Johnson Controls
- Sensor Type: Thermistor, Duct Mount
- Resistance: 10K Ohm
- Probe Length: 8 inches
- Probe Material: Stainless Steel
- Operating Temperature Range: -40°F to 221°F (-40°C to 105°C)








