SeaRAQ 6 Isolated RTD Analog Inputs

Part: 6511   Model: SeaRAQ-6511

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SeaRAQ™ I/O expansion modules provide unprecedented expansion capabilities for Sealevel Relio R3 and Relio R4 industrial computers. The SeaRAQ 6511 analog expansion board is specifically designed to interface RTDs (Resistance Temperature Detectors). RTDs offer a wide temperature measurement range, good accuracy, repeatability, and long-term stability well-suited to industrial applications.

To protect the host computer from harmful voltage spikes commonly found in industrial environments, the 6511 provides 1500 VAC isolation. For easy, reliable field wiring, the board uses removable, high-retention terminal block connectors and is compatible with thin film, wire-wound, and coiled element sensors.

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

A/D Inputs

6 RTD Inputs

A/D Resolution


Analog I/O

RTD Inputs




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

Input Isolation

1500 VAC RMS (Field-to-Logic)

Input Impedance

>20 MOhms

Input Type

RTD Platinum PT-100, Copper Cu-10, Nickel Ni-120 (2 or 3 wire configuration)


Modbus RTU

Operating Temperature

0°C to 70°C (32°F to 158°F)

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 six (6) Resistance Temperature Detector (RTD) interfaces
  • 1500 VAC field-to-logic isolation
  • 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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