RX3i 8-Channel Temperature PCB | IC695ALG508 | GE Fanuc

Product Description

The IC695ALG508 is a high-precision, 8-channel isolated RTD (Resistance Temperature Detector) input module specifically engineered for the GE PACSystems RX3i series. Unlike standard analog modules, the IC695ALG508 is designed to interface directly with temperature sensors, supporting a wide array of RTD types and resistance ranges. Its primary role is to convert low-level resistance signals from the plant floor into digital values for precise thermal monitoring and process control within the RX3i environment.

This module features 16-bit resolution and per-channel isolation, which is critical for preventing ground loops and maintaining signal integrity in electrically noisy industrial settings. Each channel is software-configurable, allowing engineers to select specific RTD types (such as Pt100, Cu10, or Ni120) and resistance levels (0–500 or 0–3000 ohms) without hardware jumpers. The IC695ALG508 also provides advanced diagnostics, including open-circuit detection and short-circuit monitoring, ensuring maximum system uptime and reliability for critical turbine and generator temperature sensing applications.

Technical Specifications

• Model Number: IC695ALG508

• Manufacturer: GE Fanuc (Emerson Automation)

• Series Compatibility: PACSystems RX3i

• Module Type: Isolated Analog RTD Input

• Number of Channels: 8 Single-Ended isolated channels

• RTD Types Supported: Pt100, Pt200, Pt500, Pt1000, Ni120, Ni200, Cu10

• Resistance Range: 0 – 500 Ohms and 0 – 3000 Ohms

• A/D Resolution: 16-bit conversion

• Isolation Threshold: Channel-to-channel and channel-to-backplane isolation

• Internal Power Draw: 450 mA @ 3.3 VDC; 600 mA @ 5 VDC

• Update Rate: Variable based on filter selection and number of active channels

• Accuracy: ±0.1% of full scale (depending on RTD type and range)

• Backplane Slot: Single-slot occupancy in RX3i Universal Backplane

• Operating Temperature: -20 °C to +60 °C (-4 °F to 140 °F)

• Shipping Weight: 2.0 kg

Application & Sensor Strategy

The IC695ALG508 is ideal for applications requiring high-density temperature monitoring, such as bearing temperature sensing in turbines or process temperature control in chemical reactors. By utilizing 3-wire or 4-wire RTD configurations, the module can automatically compensate for lead wire resistance, ensuring that the final temperature value is highly accurate even over long cable runs. For maximum performance, it is recommended to use shielded twisted-pair cabling to minimize electromagnetic interference.

Frequently Asked Questions

Is the IC695ALG508 compatible with Thermocouples?No, the IC695ALG508 is dedicated to RTD and resistance measurements. For thermocouple inputs, the IC695ALG600 or IC695ALG608 modules should be utilized.

What is the advantage of isolation in this module?Channel-to-channel isolation in the IC695ALG508 prevents fault conditions on one sensor from affecting the readings of other channels. It also eliminates measurement errors caused by potential differences between field grounding points in large-scale industrial plants.