Honeywell 8C-PAIMA1 Low Level TC/RTD Analog Input Module

Basic Overview

• Model: 8C-PAIMA1, factory part number 51454473-175
• Series: Honeywell Experion PKS / PlantCruise C300 Series 8 I/O module
• Type: Low-level temperature analog input module (TC / RTD dedicated)
• Suffix "8C": PCB conformal coated, anti-corrosion for chemical, coastal high-humidity cabinets
• Matching terminal base: IOTA board 8C-TAIMA1 (non-redundant) / 8C-TAIMB1 (redundant)
• Form: Single-slot rack plug-in for C300 controller rack, hot-swap supported

Core Channel & Signal Specifications

1. Channel Configuration
    
   Total 16 differential low-level analog input channels
    
   Support two major temperature sensor types:
   • Thermocouple (TC): J, K, T, E, R, S, B types, measuring range -200℃ ~ +850℃
   • RTD resistance temperature detector: 2-wire / 3-wire / 4-wire Pt100, Pt1000, Ni100, Cu10; range -200℃ ~ +400℃
2. Measurement Performance
   • A/D resolution: 16-bit high precision
   • Overall accuracy: ±0.15% full scale
   • Built-in cold-junction compensation for thermocouple cold end correction
   • Hardware linearization for TC/RTD non-linear temperature curves
   • On-board digital filtering to suppress industrial electromagnetic noise
3. Isolation & Protection
    
   500VAC galvanic isolation between each channel and rack backplane bus, eliminate ground loop interference
    
   Per-channel open-circuit detection (sensor break alarm), overvoltage reverse polarity protection

Electrical Parameters

• Rack backplane operating power: 24VDC, typical consumption 120mA
• Programmable low excitation current for RTD sensors to avoid self-heating measurement error
• Scan cycle: Configurable, default 10ms per channel
• No HART function, dedicated purely for low mV/resistance temperature signals

Hardware & Mechanical Features

1. Front panel indicators
   • PWR: Rack power supply status
   • STATUS: Module run / fault diagnostic alarm
      
     Blue panel label marked TC/RTD INPUT MODULE, COATED
2. Structure
    
   Single slot Series 8 rack installation, gold-plated backplane connector
    
   Dimension: 201 × 105 × 70 mm; net weight ~0.3kg
3. Environmental adaptability
    
   Operating temperature: 0℃ ~ +60℃; storage -40℃ ~ +85℃
    
   Humidity: 5%–95% RH non-condensing
    
   Conformal coated PCB: Resist chemical vapor, salt fog, dust, moisture
    
   Certifications: CE, UL, EAC industrial safety compliance

Core Working Functions

1. Collect weak low-level signals from field temperature sensors (thermocouple millivolt / RTD resistance)
2. Automatically compensate, linearize and convert raw signals into standard temperature engineering values
3. Transmit real-time temperature data to C300 CPU for PID temperature closed-loop control
4. Detect broken sensor wire, short circuit, abnormal signal and upload fault alarms to DCS operator station
5. Support redundant IOTA wiring base deployment for critical temperature monitoring loops

Complete Matching Combination

• Logic module: 8C-PAIMA1 (rack backplane signal acquisition & processing)
• Field wiring terminal base: 8C-TAIMA1 IOTA (screw terminals for TC/RTD field cable termination)
• Control system: Honeywell C300 Process Controller, Experion PKS DCS platform
• Configuration software: Control Builder

Key Advantages

1. 16-channel high-density temperature acquisition, reduce rack slot occupation for multi-point temperature monitoring
2. Differential input design, strong anti-interference for heavy EMI factory environments
3. Integrated cold-junction compensation & linearization, no external signal conditioner required
4. Conformal coated circuit board, suitable for refinery, chemical, offshore corrosive sites
5. Hot-swap maintenance, replace module without stopping the whole DCS rack
6. Full per-channel self-diagnosis, fast locate broken temperature sensor field faults

Typical Application Scenarios

• Petrochemical refining reactor, furnace, pipeline temperature monitoring
• Thermal power boiler, steam turbine flue gas, metal wall temperature measurement
• Chemical batch reaction tank temperature closed-loop control
• Oil & gas offshore platform, crude storage tank temperature detection
• Pharmaceutical, food production drying oven, sterilization temperature control
• Water treatment, sewage plant heat exchanger temperature monitoring
• All continuous process DCS systems requiring high-precision multi-point temperature acquisition