Pinpoint VPD, Temperature & Humidity Detection for AC Infinity Systems

Maintain accurate microclimate readings and responsive equipment automation across your grow tent, propagation room, or HVAC ductwork with the AC Infinity Replacement Sensor Probe – 20 FT (Model AC-SPB20). Designed specifically as a direct replacement or extended-reach climate detector for AC Infinity CLOUDFORGE humidifiers and universal environmental controllers, this corded smart sensor continuously measures ambient temperature and relative humidity so your system can calculate real-time Vapor Pressure Deficit (VPD). Whether replacing a worn sensor after intensive crop cycles or extending spot detection into large multi-bench enclosures, the AC-SPB20 keeps your climate automation locked on target.

Swiss-Made Thermal-Alloy Sensor Head for Rapid Climate Response

At the tip of the probe sits a high-precision, Swiss-made thermal-alloy sensor head engineered to detect rapid fluctuations in heat and moisture without lag or drift. Unlike sluggish generic thermistors that delay fan or humidifier activation, this rapid-response sensor delivers up-to-the-minute environmental data—allowing your controller to immediately ramp inline exhaust fans, trigger humidifiers, or regulate climate devices before temperature or VPD swings stress your canopy.

Marine-Grade SAE 316 Stainless Steel & IP44 Moisture Protection

Indoor cultivation rooms expose electronics to constant humidity, foliar sprays, and airborne particulates. Built with a corrosion-resistant SAE Type-316 stainless steel probe housing and an IP44 ingress protection rating, this sensor resists water splashes, condensation, and dust interference. For commercial facilities and high-humidity environments running continuous 24/7 cycles, replacing climate sensor probes every 3 to 6 months ensures uninterrupted calibration accuracy and peak environmental stability.

Extended 20-Foot Cable for Flexible Canopy Spot Detection

Featuring an extra-long 20-foot (6.1-meter) cord terminated with a secure 3.5 mm insertion plug, the AC-SPB20 gives cultivators complete freedom to mount controllers outside the grow tent while suspending the sensor head directly at canopy level. Its extended reach also makes it ideal for spot detection inside long HVAC ductwork runs, greenhouses, drying rooms, crawlspaces, tool sheds, and AV server closets.

Broad AC Infinity Controller & Equipment Compatibility

Equipped with a standard 3.5 mm connector, this sensor probe integrates seamlessly with AC Infinity CLOUDFORGE series plant humidifiers as well as universal smart controllers used across the CLOUDLINE inline duct fan, AIRLIFT shutter exhaust fan, AIRTITAN crawlspace fan, AIRBLAZE, and CLOUDWAY product lines.

Technical Specifications

Brand / Model: AC Infinity Controller Sensor Probe 20′ (SKU: AC-SPB20 / UPC: 819137021488)
Total Cable Length: 20 Feet (609.6 cm)
Connector Type: 3.5 mm Insertion Plug
Measured Parameters: Temperature, Relative Humidity (RH), and VPD Calculation (Controller-Dependent)
Sensor Head Technology: Swiss-Made Thermal-Alloy Climate Sensor
Probe Housing Material: Marine-Grade SAE Type-316 Stainless Steel
Environmental Protection Rating: IP44 Dust & Splash Water Resistant
Compatibility: AC Infinity CLOUDFORGE Humidifiers & AC Infinity Universal Controllers (3.5 mm Sensor Port)

What’s Included in the Box

1 × AC Infinity 20-Foot Corded Thermal-Alloy Sensor Probe (AC-SPB20)

20 ft sensor probe

AC Infinity Replacement Sensor Probe – 20 FT (Swiss Thermal-Alloy VPD, Temp & Humidity Sensor, SAE 316 Steel, IP44, Model AC-SPB20)