Product Core Brief
- Model: SE4301T02 (sub part KL3003X1-BA1)
- Brand: Emerson DeltaV
- Series: Electronic Marshalling CHARM I/O
- Core Function: Single-channel low-side sense digital input module to read field dry contact switches and pulse flow signals
- Product Type: Hot-pluggable miniature DI CHARM (non-isolated)
- Key Specs: 22.5V wetting voltage | 12.5mA current limit | 0.1–10kHz pulse counting | EOL wire break detection
- Note: New original OEM surplus; compatible with standard CHARM carrier bases only
Key Technical Specifications
| Parameter | Value |
|---|---|
| Input Sensing Type | Low-side dry contact, no external field power required |
| Wetting Voltage | 22.5 VDC ±5%, hardware limited to 12.5mA |
| ON/OFF Current Thresholds | ON >2.25mA (<5.3kΩ); OFF <1.75mA (>8.2kΩ) |
| Channel Modes | Discrete DI (<2Hz); Pulse Count (0.1Hz–10kHz, 50µs min pulse width) |
| EOL Fault Resistance Zones | Short <100Ω; Normal 400Ω–40kΩ; Open >75kΩ (requires VS6904 resistor) |
| Internal Channel Impedance | 4.8 kΩ |
| Module Power Draw | Max 22mA at 24VDC, 0.33W heat dissipation |
| Isolation Rating | No galvanic isolation between field loop and CHARM bus |
| Operating Temperature | 0°C to +60°C operational; -40°C to +85°C storage |
| Hazardous Location Cert | ATEX Ex ec IIC Gc, IECEx, FM Class I Div2 (Zone 2 only) |
| Environmental Grade | ISA S71.04 G3 corrosive gas classification |
| Mechanical Dimensions | 86mm W × 28mm H × 16mm D; net weight 0.04kg |
| Vibration Tolerance | 1mm pp (2–13.2Hz); 0.7g constant (13.2–150Hz) |
Product Introduction
This unit is a single-channel discrete input CHARM built for DeltaV electronic marshalling systems, designed to monitor passive field dry contacts like valve limit switches and pump status relays. It supplies its own loop wetting voltage to eliminate separate 24VDC field wiring runs.The dual-mode firmware cuts hardware overhead; it handles standard equipment state feedback and high-speed pulse meter inputs without separate counter cards. Per-channel current limiting contains short-circuit faults to one loop, preventing full rack signal loss seen on multi-channel legacy I/O boards.
QA & Testing SOP
- Incoming Inspection: Cross-check OEM serial number against factory batch logs; inspect gold contact pins for oxidation and PCB conformal coating for peeling. Reject units with cracked plastic housings.
- Live Functional Testing: Mount on matching carrier base, supply 24VDC rack power via Fluke 115 multimeter. Cycle dry contact inputs 500 times to validate state reporting to DeltaV workstation.
- Electrical Stress Test: Force field-side short circuits to verify 12.5mA hardware current limit engages without component overheating; 500VDC insulation resistance test between channel traces (>100MΩ pass threshold).
- Firmware Logging: Capture installed firmware revision via DeltaV Diagnostic Console and store screenshot alongside unit serial number for traceability.
- Final QC & Packaging: Purge unit with dry nitrogen to remove surface contaminants; seal in ESD shielding bag with printed test report listing 24-hour continuous runtime data.
Installation Pitfalls & Guide
❗ ESD Risk: Ungrounded handling will punch through the signal conditioning ASIC; replacement PCB repairs cost over $1,800. Always wear a wrist strap clipped to cabinet safety ground before touching contacts.❗ Cross-Model Mix-Up: This DI CHARM cannot substitute DO or AI variants; internal power regulation circuits differ, leading to no signal readouts or backplane bus overloads.❗ Zone 0/1 Misuse: The unit only carries Div2 certification. Deploying it in Zone 0 or 1 explosive areas voids all safety approvals and creates ignition hazards.❗ Missing EOL Resistors: Without VS6904 termination resistors at field contact ends, the system cannot distinguish a wire break from an intentional open switch state.❗ EMI Wiring Error: Run 24VDC power cables a minimum 10cm apart from DI signal wires. Parallel routing causes random state flicker and corrupted pulse count totals.
4-Step Replacement Guide
- Pre-install: Activate interlock bypass logic on the DeltaV HMI for the affected measurement loop; photograph carrier base wiring layout for reference. Hot-swap is allowed with rack power active.
- Removal: Squeeze the side spring latch, pull the faulty unit straight outward without twisting to avoid bending gold edge contacts.
- Install: Align the new module’s gold pins with the carrier slot, push fully until the latch audibly clicks into locked position.
- Power-on Test: Clear the bypass, cycle the field dry contact multiple times, and confirm open/short circuit fault alarms trigger when EOL resistor conditions are simulated.
FAQ
Q: Can this module read NPN/PNP active proximity sensors?A: No. It is engineered exclusively for passive dry contact loops. Active transistor sensors require a separate dedicated active DI CHARM part number.Q: Does hot-swapping damage the backplane bus?A: The carrier base includes buffered hot-swap circuitry; removing or inserting the unit while rack power stays active will not disrupt other CHARM channels on the same carrier.Q: What’s the maximum pulse frequency the counting mode supports?A: 10kHz with a minimum detectable pulse width of 50 microseconds. This covers nearly all turbine flowmeter pulse output specifications used in refinery and power plant sites.Q: Why does the module lack galvanic isolation?A: The design omits isolation to cut cost and reduce heat load for short, low-ground-offset cabinet wiring runs. Long field cables with large ground potential differences require an isolated DI CHARM variant instead.Q: What warranty coverage applies to new surplus stock?A: A 12-month limited warranty covers factory PCB and assembly defects. Damage from ESD mishandling, field-side overvoltage, or deployment in unapproved hazardous zones is excluded from coverage.Q: Can multiple dry contacts wire in series on a single channel?A: Yes, as long as total loop resistance stays below 5.3kΩ to maintain the ON-state current threshold above 2.25mA. Series resistive loads exceeding this value will register false OFF states.
