Thomas Products 4400L Side-Mounted Liquid Level Switch

Description:

The Thomas Products 4400L Level Switch is used for monitoring liquid levels in tanks and automatically actuating electrical control circuits when a predetermined level is reached. Commonly installed in water treatment systems, chemical processing equipment, coolant reservoirs, beverage machinery, and industrial storage tanks, this side-mounted liquid level switch features a rugged plastic construction with a reed switch for dependable point-level detection. Maintenance teams and system integrators use this part for repair, retrofit, expansion, and replacement of liquid level sensing systems.

Applications:

The Thomas Products 4400L is designed for point-level sensing in water, oils, coolants, and other compatible liquids. It is widely used in OEM machinery, industrial process tanks, HVAC equipment, food and beverage systems, water treatment plants, and chemical processing applications where reliable liquid level monitoring is required. The cable-version design (Model 4400L) is UL recognized and is well suited for installations requiring remote wiring while maintaining dependable switching performance.

Technical Specifications:

• Brand: Thomas Products Ltd.
• Model: 4400L Series
• Product Type: Side-Mounted Liquid Level Switch
• Mounting Style: Side Mount
• Housing Materials: Polypropylene or Polysulfone (model dependent)
• Stem Material: Polypropylene or Polysulfone
• Float Material: Polypropylene or Polysulfone
• Switch Type: SPST Reed Switch, 20 VA Pilot Duty (100 VA optional)
• Lead Wires: 22 AWG PVC, 24 in. standard (custom lengths available)
• Cable Version: UL Recognized Model 4400L
• Operating Temperature: -40°F to +176°F (Cable Version), standard non-cable models up to +225°F
• Operating Pressure: Up to 100 PSIG (Polypropylene) or 150 PSIG (Polysulfone), depending on model
• Float Specific Gravity: 0.7
• Mounting Options: 1/2 in. MNPT External, 1/2-13 Bulkhead with Nut, 5/8-11 Bulkhead with Nut, and Conduit Connector versions
• Electrical Configuration: Normally Open or Normally Closed (by float orientation)
• Typical Media: Water, Oils, Coolants, and Compatible Liquids
• Certifications: UL Recognized (4400L Cable Version)

Common Replacements:

• Thomas Products 24237
• Thomas Products 24250
• Thomas Products 42682