SeaRAQ 8 Channel Isolated 4-20 mA Current Loop Transmitter Outputs

Part: 6520   Model: SeaRAQ-6520

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SeaRAQ™ I/O expansion modules provide unprecedented expansion capabilities for Sealevel Relio R3 and Relio R4 industrial computers. The SeaRAQ 6520 expansion board adds eight 4-20 mA current loop transmitter outputs and is ideal for interfacing a wide variety of industrial process control and test equipment that use 4-20 mA signaling. The 4-20 mA standard remains a popular method for signal transmission in harsh environments, even over long distances. Current loop has a low sensitivity to electrical noise and is not affected by signal loss over cable runs or interconnections.

For maximum protection from damaging external voltages commonly found in industrial environments, the 6520 provides 1500 VAC of channel-to-channel and field-to-logic isolation. For easy, reliable field wiring, the board uses removable, high-retention terminal block connectors.

Sealevel’s SeaMAX software drivers and utilities make installation and operation easy using Microsoft Windows and Linux operating systems. Communicate using industry-standard Modbus RTU protocol or use the Sealevel SeaMAX API software libraries from your application program.

Get a jump start on your digital I/O development with The Digital I/O Handbook that will provide helpful information that you will use again and again. Check out Chapter 1 for an overview of logic principles.


Additional information

Analog I/O

4-20 mA Current Loop



D/A Outputs

8 Analog Outputs


PCB is 6.00" (L) x 4.35" (W)

Extended Temperature

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Field Wiring

16 – 30 AWG

Humidity Range

10 – 90% Relative Humidity, Non-Condensing


Modbus RTU

Operating Temperature

0°C to 70°C (32°F to 158°F)

Output Isolation

1500 VAC RMS (Channel-to-Channel and Field-to-Logic)

Output Impedance

>20 MOhms

Output Type

4-20 mA Current Loop Transmitter Outputs

Plate Connectors

High-Retention, Removable Terminal Blocks

RoHS Compliant


Storage Temperature

-50°C to 105°C (-58°F to 221°F)

  • Analog expansion module with eight (8) 4-20 mA current loop transmitter outputs
  • 18-32 VDC user loop voltage range
  • Loop powered transmitter outputs
  • 1500 VAC field-to-logic and channel-to-channel isolation
  • Reliable long-distance communication even in harsh environments
  • Industry standard Modbus RTU interface
  • Input power provided via backplane connector
  • Field wiring is simplified via removable 3.5mm terminal blocks compatible with 16-30 AWG wire
  • Includes 20-position, removable, high-retention Phoenix terminal blocks
  • Sealevel SeaMAX software supports Microsoft Windows and Linux operating systems

Windows Software

Software: SeaMAX - Windows


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