Description
Technical Specifications
- Model Series: ACN CS D2014 Special Analog Acquisition Subseries
- Power Input: 24 VDC ±10, power consumption 11 W
- Thermocouple Input Channels: 6 isolated differential channels
- Supported Thermocouple Types: K, J, T, S, R, B configurable per channel
- Cold Junction Compensation Accuracy: ±0.1 °C internal digital compensation
- Signal Resolution: 16-bit ADC temperature conversion
- Backplane Bus: Metso ACN proprietary high-speed bus
- Operating Temperature: -20 °C ~ +60 °C
- Storage Temperature: -40 °C ~ +85 °C
- Humidity: 5%–95% non-condensing
- Protection Grade: IP20 module body, IP54 full rack assembly
- Dimensions: 220 H × 160 W × 35 D mm
- Net Weight: 0.75 kg
Functional Features
- 6 independent isolated thermocouple acquisition channels with full type compatibility
- Built-in digital cold junction compensation circuit without external compensation box
- Per-channel open thermocouple wire break fault detection and alarm
- Front panel individual LED temperature over-limit fault indicator for each channel
- Onboard non-volatile Flash memory stores thermocouple calibration curves
- Full hot-swap compatible with ACN CS rack backplane
- Automatic temperature range linear correction for all thermocouple types
Performance Parameters
- Temperature Measurement Accuracy: ±0.15 °C full measurement range
- Channel Isolation Voltage: 1500 VAC channel to backplane bus
- ADC Conversion Cycle: 1.2 ms per channel
- Surge Withstand: 2 kV ESD, 4 kV electrical fast transient
- Vibration Resistance: 10–150 Hz, 1 g continuous operation
- Max Thermocouple Wire Length: 100 m shielded compensation cable
Material Composition
- PCB Substrate: FR4 high-temperature industrial fiberglass circuit board
- Signal Terminals: Gold-plated phosphor bronze anti-oxidation terminal blocks
- Internal Compensation Sensor: High-precision digital temperature IC
- Shielding Shell: Single-layer cold-rolled steel anti-corrosion shielding frame
- Mounting Frame: Black extruded aluminum alloy hard anodized coating
Structural Characteristics
- Standard 1U dual-latch plug-in rack card structure
- Front panel channel fault LED indicator group independent for 6 temperature channels
- Rear gold finger connector docking with rack backplane bus
- Separate wiring terminal compartment for thermocouple compensation cable access
- Isolation barrier separates temperature analog circuit and digital bus circuit
Working Principle
Thermocouple weak millivolt temperature signals enter channel isolation circuits, undergo multi-stage low-noise filtering, and convert to digital temperature values via 16-bit ADC chips. Internal digital cold junction sensor automatically compensates cold end temperature drift, corrected temperature data transmits to rack main controller through ACN backplane bus. Hardware circuits continuously detect open-circuit state of thermocouple compensation wires and trigger front panel alarm indicators upon wire breakage.
Advantage Highlights
- Multi-type thermocouple universal input reduces spare module inventory types
- Integrated digital cold junction compensation eliminates external compensation hardware
- Ultra-low noise analog circuit guarantees high-precision high-temperature measurement
- Independent channel wire break fault detection avoids missing temperature alarm signals
- Hot-swap maintenance without full rack power shutdown
- Pre-calibrated factory thermocouple curves, zero on-site calibration required
Applicable Industries
- Metallurgical blast furnace, smelting furnace temperature monitoring
- Cement rotary kiln preheater temperature control loops
- Petrochemical reactor, distillation tower high-temperature monitoring
- Pulp mill digester cooking temperature closed-loop control
- Thermal power boiler flue gas temperature acquisition
Installation Requirements
- Install inside standard Metso ACN CS 8/16-slot control rack
- Maintain 10 mm vertical ventilation gap between adjacent modules
- Thermocouple field wiring must use dedicated thermocouple compensation shielded cable
- Cabinet PE grounding resistance ≤ 4 Ω to suppress external temperature signal interference
- Stabilize rack backplane 24 VDC power before hot-swapping modules
- Keep cabinet internal temperature below 55 °C during continuous operation
Operation & Maintenance Precautions
- ESD anti-static protection mandatory during module disassembly and wiring
- Avoid mixing thermocouple compensation cables of different metal materials
- Conduct annual tightness inspection of terminal block wiring screws
- Do not install adjacent to high-power heating or inverter modules
- Spare modules stored in sealed anti-static packaging with desiccant
- Cut off field thermocouple cable terminals before disassembling wiring blocks
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