Product Short Description
Product Name: 05701-A-0301 System 57 Single-Channel Gas Detection Control Card (4–20 mA input).
Product Introduction: Microprocessor-based safety card for Honeywell Searchline/System 57 gas detection racks. Interfaces one 4–20 mA loop-powered gas transmitter (catalytic, electrochemical, IR) and provides local display, alarm logic, relay drive and recorder signaling.
Description
Technical Specifications:
- Input: 4–20 mA DC (sourcing or sinking), loop-powered transmitter
- Supply Voltage: 18–32 V DC (nominal 24 V DC)
- Power Consumption: 3.25 W typical (3.75 W catalytic option)
- Display: 4-character digital + 25-segment analog bar graph + message line
- Indicators: A1/A2/A3 alarm LEDs, Fault, Inhibit
- Alarm Relays: A1, A2, A3 + Fault relay (5 A @ 250 V AC non-inductive)
- Alarm Setpoint Resolution: 1 % FSD steps
- Electronic Drift: < ±2 % over 6 months
- Output Source Current: 500 mA max from field terminals
- Configuration Storage: Onboard EEPROM
- Form Factor: 3U Euro-rack card, 17 × 2.5 × 11.2 cm, 0.165 kg
- Connectors: SK1 15-way D-sub field, SK2 32-way backplane, J1/J2 sensor drive headers, J3/J4 expansion
Functional Features:
- Front-panel Reset/Select for local alarm clear and calibration
- Non-intrusive one-person calibration via menu
- Field wiring fault detection (break/short) drives Fault relay
- Inhibit mode blocks relay tripping during maintenance
Application Scenarios: Toxic/combustible gas monitoring in refineries, offshore platforms, chemical plants, wastewater H2S/CH4 zones, power plant turbine halls.
Structure & Material: Glass-epoxy PCB, plastic front bezel with LCD/LED window, D-sub and backplane gold contacts.
Working Principle: Receives 4–20 mA from field detector, linearizes and scales to gas concentration, compares against EEPROM-stored A1/A2/A3 thresholds, drives relays and recorder output, refreshes front-panel display.
Installation Requirements: Mount in System 57 EMI-shielded sub-rack slot, seat SK2 to backplane, wire transmitter to SK1, supply 24 V DC, configure via Engineering Card.
Usage Notes: 05701-A-301 is for 4–20 mA only; catalytic-bead sensors require 05701-A-302 variant. Transfer EEPROM config with Engineering Card when replacing. Do not ground shield at both ends.
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