Product Core Brief
- Model: (cross PN KJ3002X1-BG2)
- Brand: Emerson DeltaV
- Series: M-Series Traditional Rack I/O Series 2
- Core Function: 8-channel galvanically isolated thermocouple/mV analog input card with built-in cold junction compensation for furnace, boiler and reactor temperature sensors
- Product Type: Plug-in rack-mounted temperature I/O module, mates with dedicated TC termination base
- Key Specs: 8 isolated TC/mV channels | onboard CJC | multi-type TC support | 1500VDC channel-to-backplane isolation
- Note: New original surplus unit; mechanically incompatible with DeltaV S-series I/O carriers
Key Technical Specifications
| Parameter | Value |
|---|---|
| Channel Configuration | 8 independent galvanically isolated TC/millivolt input channels |
| Supported Thermocouple Types | J, K, T, E, R, S, B, N, C, D standard industrial grades |
| Cold Junction Compensation | Integrated precision onboard CJC sensor, no external compensation wiring required |
| Input mV Measurement Range | -100mV to +100mV full span for raw thermocouple millivolt signals |
| A/D Conversion Resolution | 16-bit per channel, ±0.1% full span accuracy at 0°C to +60°C |
| Channel Isolation Rating | 1500VDC optical isolation between field TC wiring and LocalBus backplane |
| LocalBus Power Draw | 130mA typical, max 180mA at 12VDC rack supply rail |
| Field Circuit Power | No field loop excitation power required for passive TC sensors |
| Hot-Swap Compatibility | Safe live insertion/removal within energized safe zone I/O racks |
| Operating Temperature | -40°C to +70°C operational; -40°C to +85°C storage |
| Environmental Grade | ISA S71.04 G3 corrosive gas resistant, full PCB conformal coating |
| Physical Dimensions | 107mm W × 41mm H × 105mm D; net weight 0.281kg |
| Vibration & Shock Rating | 1mm pp (2–13.2Hz); 0.7g constant (13.2–150Hz); 10g half-sine 11ms shock |
| Hazardous Certifications | FM Class I Div2, ATEX Ex ec IIC Gc (Zone 2 cabinet mounting only) |
| Compatibility Restriction | Exclusive fit for M-series 8-slot I/O carriers; no S-series mechanical interchange |
Product Introduction
This rack-mounted temperature input hardware acquires low-level millivolt signals from industrial thermocouple sensors for DeltaV boiler, furnace and reactor temperature control loops. Built-in cold junction compensation eliminates external CJC terminal blocks, reducing field wiring complexity and measurement drift from uncompensated TC leads.Per-channel optical isolation blocks ground loop noise on long multi-conductor TC cables routed near large motor drives and MCC cabinets. Each channel runs open/short circuit diagnostics to flag broken thermocouple wiring on the DeltaV operator station without site inspection trips.
QA & Testing SOP
- Incoming Inspection: Cross-reference serial numbers against OEM factory batch logs; inspect gold LocalBus edge connectors for oxidation and conformal coating for peeling. Reject units with cracked plastic housings or bent pin headers.
- Live Functional Testing: Install on matching M-series carrier, supply rack 12VDC LocalBus power via Fluke 115 multimeter. Feed calibrated mV reference signals to each channel and validate consistent temperature value reporting to DeltaV HMI.
- Isolation & Fault Stress Test: Run 1500VDC hipot isolation test between each channel and system ground (>100MΩ pass threshold); simulate TC wire short/open states to confirm open-loop fault alarms trigger correctly.
- CJC Calibration & Firmware Logging: Verify onboard cold junction sensor readings match bench reference temperature; capture factory Series 2 firmware revision through DeltaV Diagnostic Console and save screenshots tied to the unit serial number for full traceability.
- Final QC & Packaging: Blow PCB surfaces with dry nitrogen to remove industrial dust; seal unit in static-shield bag with printed test report capturing 24-hour continuous temperature measurement stability data.
Installation Pitfalls & Guide
❗ ESD Component Failure Risk: Ungrounded contact with backplane pins destroys low-noise analog front-end amplifiers; component replacement labor exceeds $2,400. Always attach a grounded anti-static wrist strap to cabinet safety ground before handling the module.❗ Cross-Series Carrier Mismatch: This hardware only seats on M-series racks. Forced insertion into S-series carriers bends backplane gold pins and disables full rack LocalBus communication.❗ Zone 0/1 Hazardous Area Misapplication: The card holds only Div2 safety certification. Deploying it in Zone 0 or Zone 1 flammable gas cabinets voids all safety approvals and creates ignition hazards.❗ TC Lead EMI Interference: Run thermocouple extension cable a minimum 10cm apart from 240VAC power wiring. Parallel routing induces mV noise and erratic temperature reading fluctuations during motor startup transients.❗ Cross-Model I/O Substitution Error: This temperature-sensing module cannot replace 4–20mA HART AI cards such as VE4003S2B1; mismatched signal circuitry triggers full rack LocalBus communication timeouts.
4-Step Replacement Guide
- Pre-install: Activate temperature loop bypass logic on the DeltaV workstation for all 8 associated thermocouple measurement points; photograph TC termination block field wiring layout for rebuild reference. Hot-swap is permitted within safe zone cabinets.
- Removal: Release the card’s front retention latch, pull the unit straight outward horizontally to avoid bending delicate gold backplane edge pins.
- Install: Align the new module’s gold backplane connector with the carrier slot, push fully until the retention latch audibly clicks into locked seated position. Confirm mechanical key matches TC dedicated termination block profile.
- Power-on Test: Clear all loop bypasses; feed calibrated mV reference signals to validate stable temperature readings, then simulate broken TC wire conditions to verify open-circuit diagnostic alarms register without delay.
FAQ
Q: Is external cold junction compensation hardware required for this unit?A: No, the onboard integrated CJC sensor delivers continuous reference temperature correction for all 8 channels, eliminating separate external CJC terminal hardware.Q: Does hot-swapping this unit disrupt other I/O modules on the same carrier rack?A: The M-series carrier includes buffered hot-swap circuitry; removing or inserting the module while rack power stays energized will not interrupt signal processing for other installed I/O cards.Q: What physical limitation blocks use with S-series DeltaV racks?A: M-series and S-series carriers use incompatible backplane pinout geometries and LocalBus signaling timings; forced installation permanently damages the carrier’s backplane connector pins.Q: What hardware fault patterns signal a failed unit?A: One or multiple channels show fixed max/min temperature readings, persistent open-loop fault flags on intact TC wiring, full LocalBus communication timeout on the carrier rack, or missing front-panel channel status LED indicators.Q: What warranty coverage applies to new surplus stock?A: A 12-month limited warranty covers PCB trace, low-noise analog amplifier and connector factory assembly defects. Damage from ESD mishandling, high EMI unseparated wiring, field-side overvoltage, or deployment in unapproved hazardous zones is excluded from coverage.Q: Can multiple thermocouple sensors wire in series on a single channel?A: No, series TC junctions generate compound mV signals that skew temperature readings; each channel accepts one isolated thermocouple pair only.
