Warrick 27A1E0 SPDT NEMA 1

The Warrick 27A1E0 is a heavy-duty, intrinsically safe liquid level control engineered for volatile environments where standard relays pose an ignition risk. This 120V AC-powered unit operates on a conductivity-based principle, utilizing solid-state circuitry to monitor fluid levels with a fixed sensitivity of 10k OHMS. Housed in a NEMA 1 enclosure, the 27A1E0 is designed for reliable indoor mounting within traditional control panels or equipment rooms. Featuring SPDT (Single Pole Double Throw) contacts rated at 8 Amps resistive, this controller provides high-versatility switching for both normally open and normally closed logic requirements. Built for the rigors of industrial waste treatment, sewage lift stations, and hazardous chemical processing, the Warrick Series 27 facilitates precise single-level service or differential level control (pump up/pump down). This model is UL approved for Class I, II, and III hazardous locations, ensuring secondary circuit safety when interfacing with Warrick electrodes and probes in flammable atmospheres.

Key Benefits

• Intrinsically Safe Operation: Engineered to limit energy output, preventing the ignition of flammable gases or vapors in hazardous zones.
• 10k OHMS Sensitivity: Factory-set for optimal performance with water-based liquids and wastewater in typical industrial applications.
• SPDT Output Contacts: Versatile 1-Form-C dry contacts support simultaneous high/low alarms or complex pump logic.
• NEMA 1 Protection: Provides a standardized, rugged housing suitable for general-purpose indoor installation.
• Solid-State Reliability: Eliminates moving parts within the control logic to ensure a high mechanical life cycle of up to 10 million operations.

Common Questions

What is the maximum distance for wiring a Warrick 27A1E0?
With 10k OHM sensitivity, maximum wire runs for differential service typically reach up to 900 feet when using standard #14 or #16 AWG MTW/THHN wire, provided capacitance limits are maintained.

Can the 27A1E0 be used for pump-up and pump-down applications?
Yes, by configuring the SPDT contacts and utilizing a metallic jumper between terminals H and L, the unit can be set for differential level service to manage automated filling or emptying cycles.

Does this unit require specific grounding for non-metallic tanks?
In non-metallic or lined tanks, terminal G must be connected to an additional reference electrode that is as long as the lowest sensing probe to ensure a complete electrical path.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.