Product Short Description
Product Brief
DCS rack-mounted multi-channel temperature measurement module designed for Honeywell Experion control system, acquires resistance signal data from Pt100 RTD temperature sensors deployed across process field equipment.
Model Series
Honeywell MC Series Analog Temperature Input Module Family for Thermal Process Monitoring
Description
Technical Specifications
- RTD Input Channel Count: 8 multi-drop RTD measurement channels
- Supported Sensor Type: Pt100 platinum resistance temperature detector (3-wire sensor standard)
- RTD Excitation Current: Constant 0.2 mA low-power precision excitation per channel
- Temperature Measurement Resolution: 0.01 °C high-resolution analog-to-digital conversion
- Measurement Range: -200 °C to +850 °C full-scale Pt100 calibration range
- Channel Isolation Rating: 1500 VAC galvanic isolation channel-to-backplane
- Operating Supply Voltage: 24 VDC backplane power (21.6 VDC – 26.4 VDC)
- Operating Temperature Range: 0 °C to +60 °C
Functional Features
- Built-in software automatic cold junction compensation for ambient cabinet temperature drift correction
- Per-channel wire break detection for open or short-circuit RTD sensor wiring
- Configurable temperature unit output (°C / °F) via DCS workstation programming
- Hot-swappable backplane interface for non-shutdown module maintenance
- Individual channel temperature over-limit alarm threshold configuration
Performance Parameters
- Temperature measurement absolute accuracy: ±0.08 °C across 0 °C to 200 °C range
- Thermal drift coefficient: ≤ ±0.003 °C per °C cabinet ambient temperature shift
- Channel crosstalk interference: > 65 dB attenuation at industrial 50 Hz frequency
- ADC conversion sampling rate: 400 samples per second per individual channel
- RTD lead wire resistance compensation range: up to 50 Ω per sensor wire leg
Material Composition
- Front panel housing: UL94 V-0 flame retardant black ABS plastic
- Precision measurement PCB: Low-temperature-drift FR4 fiberglass substrate
- Signal conditioning components: High-stability thin-film precision resistors
- Field terminal block: Nickel-plated brass screw terminals, PA66 flame retardant insulation
- Rack mounting bracket: Zinc-plated cold rolled steel anti-rust structure
Structural Characteristics
- Half-width single-slot standard Honeywell DCS rack module dimension
- Detachable front screw terminal block for 3-wire RTD sensor wiring termination
- Green LED channel running indicator + red wire break fault LED per measurement channel
- Keyed polarized backplane connector to avoid insertion into non-analog rack slots
Working Principle
Injects constant low-amplitude 0.2 mA excitation current into connected Pt100 3-wire RTD sensors; measures proportional resistance variation corresponding to physical temperature change of field sensors; precision analog front-end circuit compensates lead wire resistance loss; 24-bit high-resolution ADC converts resistance analog signal to digital temperature value; digital temperature data transmitted to DCS controller via LCN backplane bus with integrated wire-break fault diagnostic flagging.
Advantage Highlights
- 8 high-density RTD measurement channels reduce total rack slot consumption for multi-point temperature monitoring sites
- Low excitation current eliminates self-heating error on small-form-factor Pt100 field sensors
- Automatic lead wire resistance compensation removes temperature reading offset from long field wiring runs
- Ultra-high 0.01 °C measurement resolution enables precise thermal batch process control
- Per-channel wire break diagnostics eliminate labor-intensive field wiring inspection workflows
Applicable Industries
Petrochemical reactor temperature monitoring, power plant boiler furnace tube temperature measurement, pharmaceutical sterile thermal processing, food & beverage pasteurization temperature tracking, pulp & paper digester thermal monitoring
Installation Requirements
- Install only inside Honeywell certified standard 8-slot / 16-slot DCS I/O rack chassis
- Use dedicated shielded RTD extension cable for sensor wiring runs exceeding 15 meters
- Torque terminal block connection screws to standardized 0.7 N·m tightening torque
- Maintain minimum 10 mm vertical ventilation gap between adjacent rack modules
- Mount rack chassis away from direct radiant heat sources (heaters, exhaust ducts) inside control cabinet
Usage Precautions
- Do not connect thermocouple sensors directly to RTD input terminals; permanent measurement circuit damage occurs
- Avoid routing RTD sensor wiring parallel to high-current AC power cables to minimize electromagnetic interference
- Disconnect all field RTD wiring before executing hot-swap module replacement
- Calibrate module zero-offset annually per plant instrument maintenance schedule
- Store spare modules in temperature-stabilized anti-static sealed packaging
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