Description
At-A-Glance Executive Brief
- Model: 1C31113G03
- Brand: Westinghouse / Emerson Ovation
- Part Type: 8-channel Differential Analog Input (AI) Module
- Lifecycle status: Obsolete OEM, stocked new surplus and refurbished
- System compatibility: Ovation DCS I/O rack platform
- Input range: ±100 mV low-level differential voltage
Technical Introduction
Plant I/O racks often run into signal clipping or poor resolution when capturing thermocouple and strain gauge signals with higher-range analog cards. This module pairs with a dedicated personality module to deliver galvanically isolated differential analog to digital conversion for eight low-level mV inputs. It mounts into standard Ovation I/O rack slots and transmits converted digital values back to the Ovation controller for process monitoring and control. The ±100mV input window accommodates higher amplitude thermocouple signals than the 1C31113G02 variant while retaining stable readings for turbine and boiler instrumentation.
Best Suited For
- Power plant Ovation DCS rack maintenance and spare stocking
- Differential low-level mV sensor and thermocouple signal capture
- Legacy system migration and obsolescence risk mitigation
Core Technical Specifications
| Parameter | Value |
|---|---|
| Model | 1C31113G03 |
| Module Type | Differential Analog Input |
| Channel Count | 8 |
| Input Range | ±100 mV |
| Resolution | 13-bit |
| Mounting | Ovation standard I/O rack |
| Isolation | Galvanic channel isolation via personality module |
| Required accessory | Matching 1C31116 personality module |
| Power | 24 VDC backplane |
| Power consumption | ~2.5 W |
Please refer to the OEM datasheet for complete environmental tolerances.
Field Engineer’s Tech Notes
- The module will not operate without a compatible personality module. Using the wrong personality part number causes channel fault alarms, incorrect I/O mapping and invalid mV readings. Confirm personality module part number before rack installation.
- Differential mV inputs remain sensitive to common-mode noise. Run shielded twisted pair field wiring and maintain single-point grounding at the sensor end. Multiple ground points create ground loops that shift readings and trigger intermittent channel faults.
Adaptive QA & Testing Protocol
Each unit undergoes bench validation with precision ±100mV differential signal simulation on all 8 channels. Applied reference signals are compared against the module’s converted digital output to verify linearity and channel accuracy. Backplane communication handshake with an Ovation I/O controller validates rack registration and fault reporting functions. Terminal pin continuity checks identify cracked traces or damaged connectors. Test reports and short validation videos are available upon request.
Buyer’s FAQ
Q: Is 1C31113G03 a direct drop-in replacement for 1C31113G02? A: It fits the same Ovation rack slot, but the input range differs. Update your I/O database and confirm sensor signal levels before commissioning.
Q: What warranty applies to new surplus or refurbished 1C31113G03? A: All units carry a 12-month hardware warranty. Warranty does not cover damage from miswiring, surge events or mismatched personality hardware.
Q: What lead time can I expect for this obsolete Ovation AI module? A: Stocked units ship within 1–3 working days. If inventory is exhausted, sourcing lead time may extend to 4–8 weeks based on surplus availability.
Q: Can this module read standard 4-20mA transmitters? A: No. This module is designed for ±100mV differential low voltage signals. Select other Ovation AI variants for current loop inputs.
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