Eaton EMR6 Series Liquid Level Monitoring Relays

Safety Information

Warning: Danger to life due to electric current! Only skilled or instructed persons may carry out the operations described.

Technical Data

• Operating Temperature: -25 ... +60 °C (-13 ... +140 °F)
• Ingress Protection: IP 20
• Pollution Degree: 3

Product Overview

The Eaton EMR6 series relays are designed for liquid level monitoring applications. They utilize electrodes to detect the presence or absence of liquid at specific levels, controlling pumps or valves accordingly.

Front View and Operating Controls

a) Indication of Operational States with LEDs

• U(/T): Green LED - Indicates control supply voltage and timing status.
• R: Yellow LED - Indicates the status of the output relays (energized).
• MIN/MAX: Yellow LED - Indicates the state of the electrodes (e.g., MIN and MAX wet, MIN wet).

b) Adjustment of Resistance Threshold Value

Allows setting the sensitivity for detecting liquid based on resistance.

c) Preselection of Resistance Range

(Only for EMR6-N1000-N-1 and EMR6-N1000-A-1) Selects the appropriate resistance range for the liquid being monitored.

d) Function Selector Switch

Determines the operational mode of the relay:

• ↑ Fill: Fill mode.
• ↓ Drain: Drain mode.
• ↑A Fill, ON-delayed: Fill mode with a delay before the output activates.
• ↑B Fill, OFF-delayed: Fill mode with a delay after the liquid level drops below the minimum.
• ↓A Drain, ON-delayed: Drain mode with a delay before the output activates.
• ↓B Drain, OFF-delayed: Drain mode with a delay after the liquid level reaches the maximum.

e) Adjustment of Time Delay

(Only for EMR6-N1000-A-1) Allows fine-tuning of the delay periods.

Electrical Connection

Refer to the unit's side label for the rated control supply voltage (Us).

Control Supply Voltage:

• A1-A2
• A2-A3

Output Relay Terminals:

• 11-12/14
• 1115-1216/1418
• 2125-2226/2428

Attention: For switching currents greater than 2 A, ensure a minimum lateral spacing of 10 mm (0.394 in) between units.

Electrode Connection

• C: Reference electrode.
• MIN: Minimum level electrode.
• MAX: Maximum level electrode.

The liquid level monitoring relays can also be operated with only two electrodes (C and MAX). In this configuration, the output relay contacts switch when the liquid level reaches the MAX point.

Wiring Diagrams Description

For EMR6-N100-N-1 and EMR6-N1000-N-1:

Terminal connections include A1-A2, 11-12, 14-12, 14-18, 12-16, A2-A3. Supported wire sizes are 1x0.5-4.0 mm² (2x0.5-2.5 mm²) or 1x20-12 AWG (2x20-14 AWG). Recommended torque for connections is 0.6-0.8 Nm.

For EMR6-N1000-A-1:

Terminal connections include A1-A2, 11-14, 21-24, 12-18, 16-28, A2-A3. Supported wire sizes are 1x0.5-2.5 mm² (2x0.5-1.5 mm²) or 1x18-14 AWG (2x18-16 AWG). Recommended torque for connections is 0.6-0.8 Nm.

Function Diagrams Description

a) EMR6-N100-N-1, EMR6-N1000-N-1: Drain

Illustrates the relay draining a tank. The U/T (green) LED indicates control voltage and timing. The R (yellow) LED indicates the output relay is energized when the liquid level drops below the MIN electrode. The MIN/MAX (yellow) LED indicates the state of the electrodes.

b) EMR6-N1000-N-1: Fill

Illustrates the relay filling a tank. The U/T (green) LED indicates control voltage and timing. The R (yellow) LED indicates the output relay is energized when the liquid level reaches the MAX electrode. The MIN/MAX (yellow) LED indicates the state of the electrodes.

c) EMR6-N1000-A-1: Drain

Shows the drain function for the EMR6-N1000-A-1 model, illustrating the relay's operation based on liquid level and selected delay function (ON-delayed or OFF-delayed).

d) EMR6-N1000-A-1: Fill

Shows the fill function for the EMR6-N1000-A-1 model, illustrating the relay's operation based on liquid level and selected delay function (ON-delayed or OFF-delayed).