Warrick 3E2A Cast Iron Liquid Level Sensor Instruction Manual

1. Introduction

This manual provides essential information for the proper installation, operation, and maintenance of the Warrick 3E2A Cast Iron Liquid Level Sensor. The 3E2A is a two-probe liquid level sensor designed for industrial applications, featuring a robust cast iron body and a die-cast aluminum, epoxy-coated terminal housing. It is suitable for various environments including food and beverage, pharmaceuticals, caustics, acids, boilers, and wastewater systems.

Figure 1: Warrick 3E2A Cast Iron Liquid Level Sensor. This image displays the sensor unit, featuring a blue epoxy-coated terminal housing on top, a threaded cast iron base for vessel attachment, and a side-mounted conduit boss with internal threading.

2. Product Features

• Liquid level sensor with two probe capability.
• Die-cast aluminum, epoxy-coated terminal housing for durability.
• Compact design optimized for Original Equipment Manufacturer (OEM) integration.
• One-piece probe design with cast iron body construction.
• Attachment to vessels is achieved with external pipe threading (2" NPT Male).

3. Specifications

4. Setup and Installation

Proper installation is crucial for the reliable operation of the Warrick 3E2A sensor. This device is designed for attachment to vessels using its 2" NPT male external pipe threading. Ensure all connections are secure and sealed appropriately for the application's pressure and temperature requirements.

1. Mounting: Thread the sensor's 2" NPT male connection into a corresponding female NPT port on the vessel. Use appropriate thread sealant to ensure a leak-proof connection.
2. Probe Attachment: The 3E2A requires the use of 3R rigid or 3W wire suspended electrodes (probes). Refer to the specific probe's instructions for proper attachment and length adjustment to achieve desired liquid level detection points.
3. Electrical Wiring: Connect electrical wiring to the terminals within the die-cast aluminum housing. Use the 1/2" NPT conduit boss for secure and protected wiring entry. Ensure all wiring complies with local electrical codes and safety standards.
4. Grounding: Ensure the sensor and associated electrical system are properly grounded to prevent electrical hazards and ensure accurate readings.

Note: Installation should only be performed by qualified personnel familiar with industrial electrical systems and liquid level control.

5. Operating Instructions

The Warrick 3E2A liquid level sensor operates by detecting the presence or absence of conductive liquid between its probes and a common reference (typically the vessel wall or a common probe). When the liquid level reaches a probe, an electrical circuit is completed, signaling the presence of liquid. When the level drops below a probe, the circuit is broken.

• Ensure the sensor is correctly wired to a compatible control relay or system that interprets the probe signals.
• Verify that the liquid being monitored is sufficiently conductive for the sensor to operate reliably.
• Regularly check the system for proper response to changing liquid levels.

6. Maintenance

Routine maintenance helps ensure the longevity and accuracy of your Warrick 3E2A sensor.

• Inspection: Periodically inspect the sensor for any signs of physical damage, corrosion, or wear, especially on the probes and the threaded connections.
• Cleaning: Depending on the application, probes may accumulate deposits from the liquid. Clean probes as necessary to prevent false readings. Ensure power is disconnected before cleaning.
• Electrical Connections: Verify that all electrical connections within the terminal housing are tight and free from corrosion.
• Seal Integrity: Check the integrity of all seals and gaskets to prevent liquid ingress into the terminal housing.

7. Troubleshooting

If the sensor is not functioning as expected, consider the following troubleshooting steps:

• No Signal/Incorrect Signal:
  • Verify electrical connections are secure and correctly wired to the control system.
  • Check for continuity of the probes. A defective probe, or one making unintended contact with the sensor base or vessel, can send an incorrect signal. Ensure probes are isolated as intended.
  • Confirm the liquid's conductivity is within the sensor's operational range.
  • Inspect probes for excessive buildup or damage that might impede conductivity.
• Leakage:
  • Check thread sealant and tightness of the NPT connection to the vessel.
  • Inspect the terminal housing for any cracks or damage.
• Intermittent Operation:
  • Look for loose wiring or intermittent electrical contact.
  • Consider potential electrical interference in the environment.

If issues persist after troubleshooting, contact a qualified technician or the manufacturer for assistance.

8. Safety Information

Always observe standard safety precautions when working with electrical equipment and industrial processes.

• Disconnect all power before performing any installation, maintenance, or inspection.
• Ensure proper grounding of the sensor and associated electrical systems.
• Wear appropriate personal protective equipment (PPE) for the specific application and environment.
• Do not exceed the specified pressure and temperature ratings of the sensor.
• Ensure the sensor is compatible with the liquid being monitored to prevent material degradation or hazardous reactions.

9. Certifications

The Warrick 3E2A Liquid Level Sensor holds the following certifications:

• U.L. File #MP2489, Vol. 1 Sec. 1
• CSA
• FM (Factory Mutual)

10. Warranty and Support

For information regarding product warranty, technical support, or replacement parts, please contact the manufacturer, Gems Sensors & Controls, or your authorized Warrick distributor. Retain your purchase receipt for warranty claims.