MTL 8206-TI-IS

3. Technical Specifications

• Official Part Number: 8206-TI-IS
• Channel Configuration: 8 independent isolated input channels, every channel supports independent parameter configuration and open-circuit fault independent detection
• Supported Sensor Types: Pt100, Pt1000 standard RTD; compatible with 2-wire,3-wire,4-wire RTD wiring layout and passive resistance input mode
• Nominal RTD Excitation Current: 211 μA constant DC per single channel, fixed constant-current source driving design
• Current Source Compliance Voltage: 6.8 VDC maximum open-circuit voltage for intrinsic safety limitation
• ADC Conversion Resolution: 16-bit high precision digital sampling resolution
• Module Rated Power Input: 24 VDC ±10% operating supply voltage, max total power consumption 8.5W
• Operating Ambient Temperature Range: Continuous working: 0 ℃ ~ +60 ℃; certified storage temperature: -40 ℃ ~ +85 ℃
• Applicable Working Humidity: 5% ~95% non-condensing relative ambient humidity
• Physical Dimension: Width 42 mm × Height 127 mm × Depth 114 mm; single unit net weight 245 g
• Intrinsic Safety Parameter(Field Side): Ui=28VDC, Ii=200mA, Pi=0.85W, certified Ex ia IIC T6 hazardous area rating
• Backplane Bus Protocol: Dedicated PAC8000 internal parallel backplane communication bus
• Module Slot Key Code: Fixed C3 mechanical coding to prevent wrong-model plug-in installation

4. Functional Characteristics

1. Eight fully electrically isolated independent channels realize separated signal collection, single-channel open-circuit or short-circuit fault does not interfere with remaining seven normal working channels.
2. Built-in constant current excitation circuit provides stable 211μA DC driving current for field RTD sensor, eliminates current fluctuation induced measurement error under varying ambient temperature.
3. Onboard high-precision 16-bit analog-to-digital converter converts RTD resistance variation into digital numerical value, embedded Pt standard temperature-resistance lookup table for direct real-time temperature conversion without external calculation program.
4. Integrated intrinsic safety barrier circuit on field terminal side limits maximum voltage, current and power transmitted to explosion hazardous field circuit per ATEX intrinsic safety specification.
5. Independent channel fault diagnosis circuit continuously monitors RTD open-circuit, short-circuit and wiring abnormal state, uploads fault flag to upper control system via backplane bus once abnormal condition triggers.
6. Standard DIN rail hot-plug compatible mechanical design supports live swap replacement on PAC8000 rack without whole cabinet power cut-off.
7. Built-in digital temperature drift compensation component set restrains internal circuit parameter drift within full rated working temperature scope to guarantee long-term measurement stability.

5. Performance Parameters

• Full-scale measurement accuracy error: ≤±0.08%FS under 25℃ standard calibration ambient condition
• Annual long-term zero drift: ≤±0.05℃/year for Pt100 full measurement range under continuous powered running
• Channel-to-channel crosstalk interference error: ≤±0.03%FS under full-range adjacent channel signal variation
• Vibration resistance performance: Pass 10Hz~150Hz,5g random vibration test without component desoldering and parameter offset
• Rated MTBF value: Minimum certified service life 350000 operating hours under normal industrial working environment
• Response delay from field resistance change to digital output update: ≤32ms per single channel
• EMC anti-interference index: No measurement deviation under 10V/m RF radiation electromagnetic field conforming to IEC61000-6-2 standard
• Overload tolerance: Short-term field terminal overvoltage up to 35VDC will not cause permanent internal circuit damage of module

6. Material Composition

1. Main Circuit Substrate: High-Tg FR4 flame retardant epoxy glass fiber PCB, UL94-V0 fire resistance grade base material
2. Internal Precision Electronic Components: Low-temperature drift metal film fixed resistors, NPO temperature-stable chip capacitors, sealed industrial grade ADC conversion IC and isolated power transformer core
3. Module Outer Housing: Modified black flame-retardant PA66 nylon injection molding shell with anti-corrosion and anti-aging additive treatment
4. Field Side Terminal Connector: Oxygen-free copper terminal with nickel plating + surface gold plating ≥0.25μm thickness for stable wiring contact
5. Backplane Gold-Plated Connector Pin: Copper base with 0.03μm thick hard gold plating for long-term anti-oxidation plugging
6. Internal Fixed Fasteners: SUS304 stainless steel miniature anti-rust screws for PCB inner component fixing
7. Isolation Insulation Material: High withstand voltage polyimide isolation film between field side and control side circuit for electrical separation

7. Structural Features

1. Integral modular compact vertical structure divided into three independent functional zoning: field terminal wiring area at bottom, core acquisition PCB middle area, backplane plug connector top area.
2. Eight independent channel wiring terminals arranged in fixed sequential order on lower housing surface, every terminal silkscreen marks corresponding channel number and positive/negative definition.
3. Multiple parallel heat dissipation slot openings evenly distributed on housing left and right side for natural convection cooling of internal heating components.
4. Fixed C3 mechanical coding bump on backplane connector side to avoid mismatched insertion with other PAC8000 series non-compatible module slots.
5. Four-corner reserved DIN rail buckle positioning groove on housing back for direct snap-on installation onto standard 35mm DIN mounting rail.
6. Upper front surface equipped with 8-channel independent LED status indicator lights, respective display channel normal running, open-circuit fault and short-circuit fault state.

8. Working Principle

9. Advantage Highlights

1. Original MTL factory pre-calibrated 8-channel RTD input module with complete ATEX/CSA/SIL2 safety certification, directly interchangeable replacement for same-spec PAC8000 rack without on-site secondary calibration after installation.
2. Independent per-channel intrinsic safety + electrical isolation dual design realizes safe signal transmission between hazardous explosion area and safe control room without extra external safety barrier accessory.
3. Compatible with full 2/3/4-wire universal RTD wiring mode to adapt diversified on-site field instrument wiring layout, reduce spare part inventory classification quantity.
4. Hot-swap pluggable DIN rail installation structure supports single module online replacement without entire control cabinet power outage, cutting equipment maintenance downtime cost.
5. Ultra-low temperature drift component layout ensures stable temperature measurement precision under wide range of cabinet ambient temperature fluctuation.
6. Global unified safety certification system satisfies petrochemical projects in Europe, North America, Middle East and Southeast Asia cross-region project delivery requirements.

10. Applicable Industries

• Petrochemical Refining Industry: Refinery reactor, distillation tower, pipeline medium real-time temperature monitoring in Class I hazardous plant area
• Offshore Oil & Gas Industry: Offshore drilling platform process pipeline and equipment cabinet temperature safety collection
• Chemical Synthetic Production Industry: Fine chemical reactor, storage tank hazardous area RTD temperature measurement control
• Natural Gas Processing Industry: Natural gas purification workshop, compressor station explosion-proof temperature detection system
• Pharmaceutical Fine Chemical Industry: Explosion-proof pharmaceutical production workshop medium temperature closed-loop monitoring
• Coal Chemical Industry: Coal gasification workshop hazardous area equipment surface temperature acquisition

11. Applicable Model Series

• Same Product Line Peer Models: MTL 8205-TI-IS(RTD single specification), 8207-TC-IS(Thermocouple IS input), 8208-AI-IS 4-20mA IS analog input module
• Matching Host Rack System: Eaton MTL PAC8000 series universal DIN rack, PAC8000 backplane bus baseplate assembly
• Matching Auxiliary Accessories: Standard Pt100 field RTD sensors, intrinsically safe shielded signal cable, PAC8000 rack redundant 24VDC power supply unit

12. Installation Requirements

1. Complete module plug-in operation under PAC8000 rack powered or power-off status, align top backplane connector vertically with rack slot and insert straightly without forced skew extrusion of connector pins.
2. After installation, snap module back fixed buckle onto standard 35mm DIN rail to lock module position and avoid vibration loosening during long-term equipment operation.
3. Field RTD signal wiring connects to bottom module terminals strictly per silkscreen definition, all field side wiring adopts intrinsically safe rated shielded cable conforming to Ex ia specification.
4. Separate intrinsically safe field signal cable from 220VAC high-voltage power cable with minimum 15cm wiring gap to avoid power frequency electromagnetic interference inducing measurement drift.
5. Complete cabinet preheat for 30 minutes under rated 24VDC power supply before formal system commissioning, execute single-channel zero-point verification with standard fixed-value RTD resistance.
6. Reserve minimum 25mm free space above and below installed module for natural heat dissipation, forbid closed full-sealed installation without ventilation clearance.

13. Usage Precautions

1. Strictly prohibit manual disassembly of outer nylon housing and internal PCB circuit; arbitrary shell opening destroys built-in intrinsic safety limiting circuit and voids all safety certification effectiveness.
2. Prevent corrosive chemical liquid, industrial solvent and cooling water splashing onto module bottom wiring terminals and outer housing; cut off field signal wiring immediately once liquid contamination occurs and replace spare certified module directly.
3. Forbid overvoltage input exceeding 28VDC limit on field side terminals; excess input voltage causes irreversible breakdown of internal intrinsic safety limiting components.
4. Execute quarterly fixed maintenance inspection: check terminal wiring tightness, channel LED indicator status, measurement data accuracy and open-circuit diagnosis function, archive all test data into equipment maintenance log.
5. Store unused spare modules inside original factory anti-static sealed packaging under 18℃~26℃ dry indoor warehouse environment, forbid long-term storage under direct sunlight, damp high-humidity or freezing low-temperature outdoor ambient.
6. Avoid frequent repeated cabinet power-on/power-off operation; each full power-off interval exceeds 15 minutes to prevent thermal alternation fatigue leading to internal component solder joint open circuit.