Pentair SL1DW – Inline Thermometer (30 - 130 °F, Nylon Well)
Product Overview
The Pentair SL1DW is a durable inline thermometer designed to install directly into plumbing, providing real-time water temperature readings for pools, spas or solar heating systems.
Key Features
- Designed for ¾″ or ½″ MNPT plumbing fitting (depending on model) for easy installation.
- Temperature range from approximately 30 °F to 130 °F (-1 °C to +55 °C) for standard pool water monitoring.
- Includes a protective nylon well that shields the sensing dial and ensures accurate readings while resisting corrosion and debris.
- Large analog dial for easy visibility from equipment pad or pool room.
Technical Specifications
- Part Number: SL1DW
- Connection: ½″ MNPT (typical model) or ¾″ depending variant
- Temperature Range: 30 °F to 130 °F
- Casing: UV and chemical-resistant materials
- Application: Inline installation in pool/spa water circulation line
Applications & Compatibility
This inline thermometer is ideal for any pool or spa circulation system where an accurate reading of water temperature is required—such as monitoring heater output, solar loop temperature or general water conditions. Before purchase, verify your plumbing has the appropriate size and thread to –MNPT for proper fit.
Installation Instructions
- Shut off the pump and relieve water pressure in the line before installation.
- Select an accessible section of plumbing, and install a tees or inline fitting that accommodates the thermometer’s port size.
- Thread the SL1DW into the plumbing fitting and ensure a leak-free seal (use appropriate sealant or tape as applicable).
- Position the dial so it's easily readable from the equipment area.
- Restore circulation and verify the water temperature reading stabilizes.
Troubleshooting
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No dial movement or reading stuck: Verify the well is fully immersed in water flow and free of air pockets.
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Poor accuracy: Confirm the well is installed in full flow, avoid installing in dead-legs or low flow areas.
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Leak at connection: Ensure threads are clean, sealant applied properly, and unit is tightened securely.
Maintenance Tip
Inspect the thermometer annually for clarity of the dial and proper function. Replace if the dial becomes foggy, the well appears damaged or readings seem inconsistent. An accurate thermometer helps you monitor and manage water temperature more effectively.
