Warrick 27A1D0 1NO & 1NC

The Warrick 27A1D0 is a high-performance intrinsically safe liquid level control designed for demanding industrial environments including Class I, II, and III hazardous locations. This conductivity-based level relay operates on a 120V AC supply and features a factory-set sensitivity of 3K Ohms, ensuring reliable direct acting logic for pump control, sewage systems, and storage tank monitoring. Built with solid-state reliability and integrated surge suppression, the 27A1D0 provides a robust SPDT (1NO/1NC) output rated for 8A resistive at 120/240VAC. Whether configured for single-level service like a high-level alarm or differential service for pump-down applications, this controller maintains precision without the risk of igniting flammable atmospheres. Its compact design facilitates easy mounting within any standard NEMA enclosure or control panel.

• Intrinsically Safe Design: UL and CSA approved for hazardous atmospheres, eliminating the need for bulky explosion-proof housings.
• Direct Acting Operation: Specifically calibrated for direct acting logic where the relay energizes upon liquid contact with the probe.
• Industrial Durability: Solid-state internal components ensure longevity in high-cycle waste treatment and pump control applications.
• Versatile Signaling: Features SPDT contacts (Form-C) to provide both normally open and normally closed signaling from a single unit.
• Field Reliability: Includes internal surge suppression to protect sensitive circuitry from transient voltage spikes common in industrial power grids.

How do I wire the Warrick 27A1D0 for high-level alarm service?
For single-level detection, install a metallic jumper between terminals H and L on the Warrick series 27 board. Connect the probe to terminal L and ensure terminal G is properly grounded to the tank or a reference electrode.

What is the maximum distance I can run probe wiring?
The maximum distance is determined by the capacitance and resistance of the field 14-16 AWG MTW/THHN wire. For 120V models, ensure the total resistance of the probe path does not exceed the 3K Ohm sensitivity of the unit.

Can this controller be used in non-metallic tanks?
Yes. In non-metallic vessels, terminal G must be connected to an additional reference electrode of the same length as the longest sensing probe to complete the conductivity circuit.

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.