20' Air / Water / Solar Temperature Sensor
Product Overview
A factory-calibrated 10k-ohm thermistor that restores precise thermal tracking across Pentair automation boards.
When an automation panel shows erroneous readings like 0°F or freeze protection engages on warm days, the thermistor has drifted or shorted. The genuine Pentair 520272 provides a 20-foot lead calibrated specifically for EasyTouch, IntelliTouch, and TimeMaster with LX-10 Power Center systems. Using OEM internal resistors prevents the phantom temperature swings common with unbranded aftermarket sensors.
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Benefits & What Makes It Different
20-Foot Shielded Cable
Provides ample reach to route cleanly through low-voltage raceways to plumbing, eaves, or roof solar collectors.
Multipurpose 10k-Ohm Design
Interchangeable across ambient air, water pipe, and solar panel monitoring points without recalibration.
OEM Signal Consistency
Maintains accurate resistance curves across extreme temperature ranges, preventing premature freeze protection cycles.
Compatibility
- Pentair EasyTouch, IntelliTouch, and SunTouch automation systems
- Pentair Compool-to-EasyTouch upgrades with LX-10 Power Center
- Standard 10k-ohm thermistor air, water, and solar inputs
When To Use This
Pro Tip
When mounting as a water sensor, drill a 5/16-inch hole between the pump and filter, insert the probe with the included O-ring, and snug the clamp by hand with a nut driver—power drills frequently overtighten the clamp and crack the probe sleeve.
Common Questions & Instructions
How do I know if my Pentair temperature sensor has failed?
Failed sensors typically display continuous extreme readings like -40°F (open circuit) or above 130°F (short circuit) on the display panel. You can confirm by testing the two leads with a multimeter set to ohms; at 77°F ambient water or air, a healthy Pentair thermistor reads exactly 10,000 ohms (10kΩ).
Can this 20-foot sensor be used for water, air, and solar applications?
Yes. The Pentair 520272 uses the exact same 10k-ohm thermistor element for all three positions. For water monitoring, it secures into a 5/16-inch drilled hole between the filter and pump with a hose clamp; for air and solar, it mounts via screw tabs exposed to atmospheric or roof conditions.
Is replacing the Pentair 520272 a DIY-friendly repair?
Yes, this is an accessible DIY repair requiring basic hand tools. After powering off the main breaker, connect the two low-voltage wires to the designated terminal block on the automation mother board (polarity does not matter). Avoid over-torquing the pipe clamp, which can crush the plastic sensor housing.
Delivered today to your DFW neighborhood
Order this item by 2 PM Central on a weekday, and we'll have it on your driveway by evening. Same-day delivery is FREE to every ZIP in our DFW coverage area — no minimum — or it's free with our weekly service plan.
