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The GE IC695ALG508-AA is an 8-Channel Isolated RTD Input Module from Emerson’s (formerly GE Fanuc) PACSystems RX3i series. It provides eight isolated, differential inputs for Resistance Temperature Detectors (RTDs) or direct resistance measurements, making it ideal for precise temperature monitoring in industrial processes, turbines, power generation, and manufacturing applications. Each channel on the GE IC695ALG508-AA can be independently configured for 2-, 3-, or 4-wire RTD connections and supports a wide range of RTD types (Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Cu10, etc.) as well as resistance ranges up to 0–4200 Ω. The module features high-resolution 24-bit A/D conversion, channel-to-channel and channel-to-backplane isolation, and advanced diagnostics including open-wire detection and fault reporting. The GE IC695ALG508-AA occupies a single slot in the RX3i universal backplane and supports hot-swap (RIUP). Its robust design with conformal-coated variants available ensures reliable performance in harsh environments. The GE IC695ALG508-AA integrates seamlessly with RX3i CPUs via Proficy Machine Edition for easy configuration and real-time temperature data acquisition.

Model,GE IC695ALG508-AA

Manufacturer,GE Fanuc / Emerson Automation

Series,PACSystems RX3i

Product Type,8-Channel Isolated RTD / Resistance Input Module

Input Channels,8 isolated differential inputs

RTD / Resistance Support,"2-, 3-, or 4-wire RTD; resistance 0–4200 Ω"

Supported RTD Types,"Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Cu10, etc. (configurable per channel)"

Resolution,24-bit A/D conversion

Data Format,Floating point (IEEE 32-bit) or 16-bit integer

Isolation,Channel-to-channel and channel-to-backplane

Accuracy,High accuracy with configurable filters (8 Hz to 500 Hz)

Power Requirements,3.3 VDC @ 400 mA max; 5.1 VDC @ 200 mA max

Mounting,Single slot in RX3i universal backplane

Additional Features,"Open-wire detection, hot-swap (RIUP) support, diagnostic LEDs, configurable data units (°C, °F, or Ω)"

Install the GE IC695ALG508-AA into an available slot in the RX3i universal backplane.

Connect RTD sensors to the terminal block using 2-, 3-, or 4-wire configurations per channel requirements.

Configure each channel in Proficy Machine Edition: select RTD type, wiring mode, filter frequency, and scaling (units in °C, °F, or ohms).

Power up the rack and verify the Module OK and Field Status LEDs indicate healthy operation with no faults.

Download the hardware configuration and monitor real-time temperature values in %AI registers via the programming software or HMI.

Perform loop checks or use known temperature references to validate accuracy on critical channels.

Integrate temperature data into control logic for monitoring, alarming, or process regulation.

Power down the RX3i rack before inserting or removing the GE IC695ALG508-AA to avoid backplane damage.

Use ESD protection when handling the module to safeguard sensitive analog circuitry.

Ensure correct RTD wiring (2/3/4-wire) and use shielded cable to minimize noise; compensate for lead resistance in 2-wire mode if necessary.

Verify the terminal block is fully seated (TB LED should be green when present).

Confirm the rack power supply supports the module’s backplane current draw (3.3 V and 5.1 V).

Do not exceed the module’s isolation voltage ratings or input resistance ranges.

After installation, run module diagnostics in Proficy Machine Edition and check for open-wire or fault alarms before commissioning.

Check the Module OK and Field Status LEDs daily on the GE IC695ALG508-AA for normal operation and any channel faults.

Monitor temperature trends and %AI values in the HMI or programming software for unexpected drift or out-of-range readings.

Review diagnostic logs for open-wire detections, channel faults, or terminal block issues.

Inspect field wiring and terminal block connections weekly for tightness, corrosion, or damage.

Verify cabinet temperature and ventilation to keep ambient conditions within 0–60°C.

Clean dust from the module and terminal block (power off) using low-pressure compressed air every 1–3 months.

During scheduled maintenance, perform calibration checks with certified temperature sources, test open-wire detection, and backup configuration.

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