Description
The Allen-Bradley 1797-IRT8 is an 8-channel temperature and millivolt input module from the FLEX Ex distributed I/O product family. It is specifically engineered for installation in hazardous industrial environments (such as oil and gas refineries, chemical plants, and pharmaceutical processing areas) requiring intrinsically safe signal conditioning.
Commercial and Logistics Status
| Parameter | Value |
| Condition | Factory Sealed New Surplus / Tested Refurbished (Verify specific unit availability upon inquiry) |
| Availability | Subject to current inventory status |
| Lifecycle Status | Discontinued / Obsolete by manufacturer |
| Standard Lead Time | 3 to 5 business days for domestic shipments; international freight times vary |
| Warranty | 12 months standard replacement warranty |
| Pricing Note | Price subject to market conditions; contact us for a firm quote |
Technical Specifications
| Parameter | Value |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Family | FLEX Ex I/O System |
| Part Number / Catalog ID | 1797-IRT8 |
| Module Type | 8-Channel Thermocouple / RTD / Millivolt Input Module |
| Input Channels | 8 non-isolated, multiplexed channels |
| Supported Sensor Types | Thermocouples (Types J, K, T, E, S, R, B, N), RTDs (Pt100, Pt200), and mV inputs |
| Signal Input Range | -40 to +100 mV or 0 to 485 \Omega |
| Resolution | 16-bit |
| Settling Time | 8 ms (to 99% of final value) |
| Lead Resistance Compensation | Up to 15 \Omega |
| Power Consumption | 1.6 W (field-side power via 9.5V DC max bus) |
| Compatible Terminal Bases | 1797-TB3, 1797-TB3S (Intrinsically safe terminal blocks) |
| Enclosure Rating | IP20 (requires placement in an approved panel enclosure) |
| Operating Temperature | -20^\circC to +70^\circC |
Engineering and Field Integration Notes
Deploying the 1797-IRT8 module within hazardous process areas requires strict alignment with intrinsic safety guidelines and proper hardware configuration.
Integration Guidelines
- Intrinsic Safety Barriers: Ensure the module is installed on a compatible 1797 terminal base (
1797-TB3or1797-TB3S) backed by an approved power supply and communication adapter (such as a ControlNet Ex network interface) designed to maintain hazardous-area separation. - Terminal Base Keyswitch Setting: Rotate the mechanical keyswitch on the terminal base unit to the correct designated position prior to mounting and powering the 1797-IRT8 module to prevent incorrect hardware insertion.
- Input Filtering and Configuration: Configure software input filters within your control environment (e.g., Studio 5000 / RSLogix) to match your noise reduction and response time requirements—lower filter settings improve noise rejection, while higher settings increase update speed.
