Description
The Honeywell 8C-PAIMA1 (Part Number: 51454473-175) is a 16-channel Low-Level Analog Input (LLAI) module manufactured by Honeywell Process Solutions for the Experion Process Knowledge System (PKS) Series 8 I/O platform. As a dedicated temperature and millivolt signal acquisition card, the 8C-PAIMA1 interfaces directly with thermocouples (TC) and Resistance Temperature Detectors (RTD) without requiring external signal transmitters or conditioning barriers, delivering high-resolution temperature data to the C300 controller.
The 8C-PAIMA1 represents a convergence of high-density channel architecture and precision measurement engineering. Its G3-grade conformal coating and full channel-to-channel isolation make it equally suited for climate-controlled control rooms and the corrosive, humid environments found in offshore platforms, chemical plants, and marine machinery spaces.
Application Scenarios
In a petrochemical refinery, reactor temperature monitoring is a safety-critical function where a single unmeasured hot spot can escalate into a runaway reaction. Thermocouples positioned at multiple elevation points within a catalytic reactor must be scanned continuously, with any open-circuit or drift condition flagged immediately to the safety instrumented system.
The Honeywell 8C-PAIMA1 addresses this by qualifying every thermocouple conversion with integrated open-thermocouple detection (OTD). Each channel is independently monitored, and the module can be configured to drive the temperature variable upscale or downscale upon sensor failure—ensuring the control system interprets a broken thermocouple as a fault condition rather than an ambiguous reading. In this application, the 8C-PAIMA1 transforms raw millivolt signals into actionable temperature data that directly supports emergency shutdown logic and process optimization.
For offshore platforms where salt fog, hydrogen sulfide, and humidity attack every exposed surface, the 8C-PAIMA1’s conformal-coated printed wiring assembly provides the environmental resilience required for continuous operation. The module mounts on a matching IOTA termination assembly, enabling field wiring to remain undisturbed during module replacement—a critical advantage when maintenance windows are constrained by weather or production schedules.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 8C- |
| Ordering Code | 51454473-175 |
| Manufacturer | Honeywell Process Solutions |
| Product Category | Low-Level Analog Input Module (TC/RTD/mV) |
| Channel Count | 16 channels, individually configurable for TC, RTD, or mV |
| Supported Thermocouples | Types B, E, J, K, N, R, S, T (NIST Monograph 175 / ITS-90 compliant) |
| Supported RTD Types | Pt100 (DIN/JIS), Pt200, Pt500, Ni120, Cu10 (2/3/4-wire) |
| Millivolt Input Range | -20 mV to +100 mV DC; 0 to 100 mV; -50 mV to +50 mV |
| ADC Resolution | 24-bit Sigma-Delta (Σ-Δ) with digital filtering |
| Input Scan Rate | 100 ms to 500 ms (configurable); 1 second fixed for temperature update |
| Cold Junction Compensation | Dual internal thermistors in IOTA connector block; ±0.5°C accuracy |
| Galvanic Isolation | 1500 VDC channel-to-logic; 500 VAC/VDC channel-to-channel group |
| Common Mode Rejection | >120 dB at 50/60 Hz |
| Normal Mode Rejection | >60 dB at 50/60 Hz |
| Power Supply | 24 VDC nominal (20.4–28.8 VDC via IOTA backplane) |
| Power Dissipation | 3.2 W nominal; 4.5 W maximum |
| Operating Temperature | -40°C to +70°C |
| Protection Rating | IP20 (cabinet-mounted); ISA G3 conformal coating |
| Mounting | IOTA termination assembly; supports RIUP (Removal and Insertion Under Power) |
| Physical Dimensions | Approximately 165 mm × 38 mm × 127 mm |
| Weight | Approximately 0.38 kg |
