Description

Product Description

The IC695ALG508 is a high-precision temperature and resistance input module developed for the GE Fanuc / Emerson PACSystems RX3i platform. It provides eight isolated differential input channels, each configurable for RTD sensing or direct resistance measurement.

Designed for process environments requiring accurate thermal monitoring, the module supports multiple RTD standards and wiring configurations, including 2-wire, 3-wire, and 4-wire connections. A Sigma-Delta conversion architecture ensures stable and precise readings, while advanced diagnostics enhance system reliability and fault visibility.

This module is typically deployed in applications where measurement accuracy, noise immunity, and flexible configuration are critical.

Technical Specifications

General Information

• Model: IC695ALG508

• Manufacturer: GE Fanuc / Emerson

• Series: PACSystems RX3i

• Product Type: RTD / Resistance Input Module

• Channels: 8 isolated differential inputs

• Mounting: RX3i Universal Backplane

• Weight: 0.51 lbs

Input Configuration

• RTD wiring: 2-wire, 3-wire, 4-wire selectable per channel

• Resistance ranges:

• 0–250 Ω

• 0–500 Ω

• 0–1000 Ω

• 0–2000 Ω

• 0–3000 Ω

• 0–4000 Ω

Supported RTD Types

• Platinum (Pt 385, Pt 391.6): 50 / 100 / 200 / 500 / 1000 Ω

• Nickel (Ni 618, Ni 672): 100 / 200 / 500 / 1000 Ω, 120 Ω

• Nickel-Iron (NiFe 518): 604 Ω

• Copper (Cu 426): 10 / 50 / 100 Ω

Performance Characteristics

• Conversion method: Sigma-Delta A/D

• Data format:

• 32-bit floating point

• 16-bit integer (stored in 32-bit field)

• Typical accuracy: better than ±0.1% of span at 25°C

• Input impedance: ~1 MΩ

• Notch filter: configurable from 2.3 Hz to 28 Hz

• Update time:

• ~10 ms per channel (high-speed filter)

• up to ~127 ms per channel (low-frequency filtering)

Diagnostics & Monitoring

• Open-circuit (broken wire) detection

• Short-circuit detection

• High/low and high-high/low-low alarm thresholds

• Rate-of-change alarm (positive and negative)

• Internal diagnostics: watchdog, RAM and flash integrity checks

• Terminal block presence detection

Isolation

• Channel grouping: 2 groups of 4 channels

• Field-to-backplane isolation:

• 250 VAC continuous

• 1500 VAC for 1 minute

• 2550 VDC for 1 second

Power Requirements

• 3.3 VDC: approx. 400 mA

• 5 VDC: approx. 200 mA

• Maximum power dissipation: ~2.5 W

Environmental Conditions

• Operating temperature: 0 °C to 60 °C

• Storage temperature: –40 °C to +85 °C

• Humidity: 5–95% non-condensing

Mechanical & Installation

• Dimensions: 34 × 145 × 140 mm

• Terminal blocks required: IC694TBB032 or IC694TBS032

• Supports hot insertion and removal (RIUP capability)

Key Features

• Eight isolated RTD/resistance input channels

• Flexible wiring support (2, 3, or 4 wires per channel)

• High-resolution Sigma-Delta conversion for stable measurements

• Programmable digital filtering for noise rejection

• Comprehensive diagnostic and alarm functions

• Supports ITS-90 linearization standards

• Hot-swappable within RX3i systems

Applications

This module is typically used in temperature monitoring systems across process industries, including chemical plants, power generation, and manufacturing lines. It is suitable for applications requiring precise RTD measurement, such as reactor temperature control, heat exchanger monitoring, and environmental sensing.

FAQ

Q: Can different RTD types be used on each channel?
A: Yes, each channel is independently configurable, allowing mixed RTD types and resistance inputs within the same module.

Q: Does the module support live replacement?
A: Yes, it supports removal and insertion under power (RIUP) when used in a compatible RX3i system.

Q: What filtering options are available?
A: A programmable notch filter from 2.3 Hz to 28 Hz is available to suppress electrical noise.

Q: Is external signal conditioning required?
A: No, the module includes built-in linearization and signal processing for RTD inputs.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems