Model Number Explanation

05701: System 57 / 5701 series (gas detection control system)

A: Standard card assembly

0326: Single‑channel field interface card (wiring/protection for one detector channel)

Technical Specifications

Signal Compatibility: 4–20 mA (standard) or catalytic bead sensor inputs

Power Supply: 18–32 VDC (nominal 24 VDC, from rack backplane)

Power Consumption: ~1.0 W (isolated circuitry)

Isolation: Field side vs. system side galvanic isolation

Protection: Overvoltage, reverse polarity, short‑circuit protection

Terminals: Screw terminals for field wiring (max 2.5 mm² / 14 AWG)

Operating Temperature: −40°C to +70°C

Form Factor: 3U rack‑mount card (19” subrack)

Dimensions: 112 × 25 × 102 mm (L×W×H)

Weight: ~0.13 kg

Certifications: CE marked

Key Features

Detector interface: Connects one gas detector (4–20 mA or catalytic) to System 57

Signal conditioning: Filters and protects low‑level sensor signals

Hot‑swap capable: Removable without disrupting other rack channels

LED status: Power/activity indicator on front edge

Backplane communication: Passes sensor data to control cards via backplane

Applications

System Role: Field‑wiring interface for System 57 gas detection racks

Industries: Oil & gas, petrochemical, power, pharmaceuticals, hazardous safety

Use Cases:

Terminating 4–20 mA or catalytic bead gas detector field cables

Providing electrical isolation and protection between field and control electronics

Supporting single‑channel high‑integrity safety loops

Compatibility & Replacement

System Compatibility: Honeywell System 57 (5701 series 19” subracks)

Control Card Compatibility: 05701‑A‑0301 (4–20 mA), 05701‑A‑0302 (catalytic)

Replacement Type: Direct drop‑in for 05701‑A‑0326

Legacy Status: Obsolete (EOL); available as refurbished/used stock

05701‑A‑0325 vs 0326

0325: DC Input Card – supplies 24 VDC power to the entire rack (power supply module)

0326: Field Interface Card – interfaces one gas detector to a control card (I/O module)