Potter Water Level Supervisory Switch

Potter WLS Water Level Switch

The Potter WLS is a float-operated water level switch designed for reliable supervision of water levels in sprinkler supply tanks. This device accommodates both gravity and pressure tank applications, making it a versatile choice for fire suppression and irrigation system monitoring. The WLS mounts securely to wood or steel tank construction and features a 1 1/2" American Standard Pipe Thread bushing for straightforward integration into existing tank infrastructure.

Overview

Water level monitoring is critical in fire protection and irrigation systems where supply consistency directly impacts system performance. The Potter WLS delivers continuous, float-based level detection without the complexity of electronic sensors or external power dependencies for the float mechanism itself. Its mechanical design ensures long-term reliability in outdoor and indoor tank environments. The device operates within the temperature range of 40°F to 140°F, covering standard seasonal and operational conditions across North American climates.

Key Features

• Float-Operated Design: Mechanical float mechanism ensures responsive level detection without calibration drift
• Dual Tank Compatibility: Functions reliably on both pressure and gravity-fed water supply tanks
• Universal Mounting: Installs on wood or steel tank surfaces with zinc-plated steel base for corrosion resistance
• Standard Threading: 1 1/2" American Standard Pipe Thread bushing enables fast, code-compliant installation
• Electrical Rating: 125/250VAC at 2A supports integration with control panels and monitoring circuits
• Compact Footprint: Housing dimensions of 5.56" height × 3.50" width × 2.56" depth fit standard tank openings and equipment rooms
• Vertical Orientation Required: Device must be mounted vertically with conduit entrance oriented downward in wooden tanks for proper float travel and reliability
• Extended Warranty: Backed by a 5-year manufacturer warranty covering defects and performance

Integration & Compatibility

The WLS integrates with standard fire suppression control circuits and building automation systems. Its contact rating of 2A at 125/250VAC accommodates both AC and dual-voltage DC applications common in security and fire system architectures. The 1 1/2" NPT bushing aligns with industry-standard tank fittings, eliminating custom adapters. Installers should verify local fire code requirements for water level supervision; many jurisdictions mandate continuous monitoring on sprinkler supply tanks, and the WLS satisfies this requirement for gravity and pressure configurations.

Package Contents

The Potter WLS switch is supplied complete and ready for installation. No additional mounting hardware or adapters are required beyond standard conduit fittings compatible with the bushing entrance.

Jerry Tildsen

I've evaluated the Potter WLS in multiple tank monitoring installations, and the float mechanism remains one of the most reliable designs for continuous water level supervision. The WLS performs consistently across pressure and gravity systems without electronic drift or sensor fouling—critical advantages in outdoor and dusty environments.

Technical Highlights:

• Float Reliability: Mechanical design eliminates electronic calibration issues common in optical or capacitive sensors, reducing nuisance alarms in field conditions
• Dual-Voltage Support: 125/250VAC rating ensures compatibility with legacy fire suppression panels and modern hybrid control systems
• Installation Simplicity: 1 1/2" NPT bushing and compact housing integrate directly into tank openings without custom fabrication

Deployment Considerations:

• Verify vertical mounting orientation during installation; horizontal mounting compromises float travel and contact closure reliability
• Confirm tank material (wood or steel) before mounting; the zinc-plated base resists corrosion in both environments but requires appropriate sealant for wooden tank penetrations
• Validate local fire codes; most jurisdictions require continuous supervision of sprinkler supply tanks, and the WLS fulfills this requirement cost-effectively

The Potter WLS remains a solid choice for facilities requiring dependable tank level monitoring without electronic complexity or ongoing sensor maintenance. The 5-year warranty and proven design make it a low-risk addition to fire protection and irrigation system upgrades.