Description
Product Introduction
The Autronica BSD-310-N is a specialized single-loop driver board designed for mounting inside AutroSafe series fire alarm control panels (BS-310/420) and controllers (BC-420). Serving as a high-integrity data modem, the module interfaces the main system backplane directly with field-located addressable fire detectors, manual call points, and I/O units. It provides continuous electrical resistance monitoring to detect short circuits, earth faults, or wire breaks before they cause a full system compromise.
What sets the BSD-310-N apart from standard BSD-310 boards is its rated capability for hazardous environments. The “/N” variant incorporates energy-limiting hardware and specialized physical insulation to safely drive loops routed through Hazardous Area Zone 2, driving Ex-certified (/N type) optical and thermal detectors. By utilizing automatic software addressing upon backplane insertion, it allows marine and industrial site techs to swap failing cards fast without fiddling with legacy hardware DIP switches.
Key Technical Specifications
| Parameter | Specification |
| Manufacturer & Model | Autronica BSD-310-N (116-BSD-310/N) |
| System Compatibility | AutroSafe BS-310, BS-320, BS-420, BC-320, BC-420 |
| Hazardous Area Rating | Ex Zone 2 (For Ex n / Ex ic approved field units) |
| Loop Address Capacity | Up to 127 addresses total (Max 99-100 detectors/MCPs, remainder I/O) |
| Operating Voltage | 24 VDC (Internal rail powered) |
| Max Loop Current Output | 100 mA |
| Idle Power Consumption | 10 mA at 24VREG (26 mA at 12.5% comms traffic) |
| Max Total Cable Loop Resistance | 50 Ohms total (25 Ohms per wire) |
| Max Cable Capacitance | 500 nF |
| Fail-Safe Output (F/S) | Dedicated output interface (10ms OFF / 20ms ON low-freq fallback signal) |
| Addressing Method | Self-addressing (Auto-detected via AutroSafe internal backplane rail) |
| Terminal Wire Gauge | Screw terminals supporting up to 2.5 mm² (14 AWG) field wiring |
Application Scenarios & The “Trench” Experience
The Marine Engineer’s 2 AM Emergency
Imagine this: You’re halfway across the Atlantic on an LNG carrier. At 02:15, a “Loop 3 Earth Fault / Comm Error” trouble light hits the bridge AutroSafe BS-420 panel. The loop runs straight through a Zone 2 compressor room on deck. Water ingress at an Ex junction box shorted the loop driver, frying the communication driver channel. Without Loop 3, your safety system is partially blind, triggering mandatory watch standing and threatening off-hire penalties at the next port. Slapping a standard BSD-310 in there isn’t allowed due to hazardous zone classification—you need an exact -N replacement right now.
Key Field Applications
- Offshore Oil & Gas Platforms: Driving fire detection loops running through Ex Zone 2 module decks, gas turbine enclosures, and process separator areas.
- LNG / Chemical Carriers: Monitoring deck-mounted manual call points and optical flame/smoke detectors requiring strict Ex n / Ex ic approvals.
- Refineries & Petrochemical Facilities: Interfacing perimeter perimeter heat detectors and gas monitoring I/O units inside hazardous process zones with the central AutroSafe system.
- Power Generation Facilities: Fire loop protection in fuel-handling, lube oil, and switchgear rooms where Zone 2 equipment certification is mandated.
BSD-310-N
Transparency SOP: Quality Assurance & Testing
We understand that an offshore fire system component cannot fail. We don’t just ship boxes; we test them on actual Autronica test rigs.
- Inbound Visual & Physical Audit: Verification of serial/lot numbers, board revision, conformal coating condition, PCB trace health, and OEM heat-sink seating.
- Backplane Handshake & Auto-Addressing: Module is plugged into an AutroSafe BC-420 test rack to confirm auto-addressing, firmware handshakes, and panel recognition.
- Loop Resistance & Load Stress Test: The board is loaded with a simulated 127-device loop at 50 Ohms resistance and tested for voltage drop, signal noise, and current limit trip thresholds.
- Fail-Safe Circuit Injection: Signal loss is intentionally introduced to verify the dedicated Fail_Safe (F/S) output output pin drops out cleanly.
- Anti-Static Sealing & Marine-Grade Packaging: Boards are cleared, vacuum-sealed in ESD shielding material, and packaged with heavy bubble isolation to withstand rugged transit.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ DO NOT Swap Standard for -N in Hazardous Areas
Standard cards lack the specific energy-limiting components of the /N series. Installing a standard card on a loop servicing Zone 2 EX-rated detectors voids safety certifications and poses an explosion risk in hazardous atmospheres. Always verify the “/N” silkscreen on the board.
❗ Watch Out for Device Count Limits on Power-Hungry Loops
The spec sheet says 127 total units allowed, but pay close attention to device types! You can only connect a maximum of 99–100 detectors or manual call points per -N. The remaining 27 address slots are strictly reserved for low-draw I/O units or sounders. Exceeding 100 detectors causes mysterious, intermittent “loop overload” faults under alarm states when current draw spikes.
⚠️ Check Field Grounding Before Installing New Module
Loop drivers are often destroyed by ground faults occurring out in the field. Before snappingw into the DIN rail, megger test the field wiring (disconnect from board first!) and check shield continuity across terminals 3 and 6. If you land a shorted loop on a fresh board, you risk killing the new driver instantly.
Frequently Asked Questions (FAQ for Conversion)
Q: Can I hot-e module while the AutroSafe panel is fully powered?
A: Technically, the backplane rail supports card insertion, but field experience says don’t risk it. Always power down the internal 24V supply or isolate the backplane rail before pulling or inserting I/O cards to prevent field-wiring arching or bus corruption.
Q: Are there any DIP switches or jumpers I need to set on the board before installation?
A: No. e uses automatic software addressing. When plugged into the AutroSafe internal mounting rail, the panel controller auto-detects its physical position on the bus.
Q: What is the differencen and the high-power BSD-311?
A: d output up to 100 mA to the loop, while the BSD-311 is a high-power version outputting up to 200 mA for long wire runs or heavy loop loads. However, the BSD-311 is NOT rated for Ex Zone 2 /N-type detectors—you cannot ra with a BSD-311.
Q: Is this board supplied as new surplus or refurbished, and what warranty comes with it?
A: We supply both unused, factory-sealed surplus and fully bench-tested refurbished units depending on stocy card sold carries our comprehensive 12-month replacement warranty, matching OEM standard coverage.
Q: Why is purchasing news boards often cheaper and faster than ordering direct from the OEM?
A: Autronica legacy parts are often subject to long factory lead times or formal upgrade pushes to newer AutroSafe hardware platforms. We source high-grade surplus directly from canceled shipbuilding projects, cancelled platform upgrades, and demobilized spares inventories, giving you access to genuine OEM hardware at lower prices with zero lead time.
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