Model Number Explanation

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

A: Standard card assembly

0301: Single-channel, 4–20 mA loop input configuration

Technical Specifications

Input Signal: 4–20 mA (compatible with catalytic bead & 4–20 mA gas sensors)

Loop Resistance: Max 500 Ω (total, including sensor)

Power Supply: 18–32 VDC (nominal 24 VDC)

Power Consumption: 3.25 W (typical, 4–20 mA mode)

Display: 4-character digital + 25-segment analog bar graph

Accuracy: ±1% FSD (full-scale deflection)

Resolution: 1% FSD (alarm setpoints)

Response Time: < 2 seconds

Operating Temperature: -40°C to +70°C

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

Weight: ~0.16 kg

Certifications: CE marked

Key Features

Single-channel integrity: Dedicated processing for one gas detector loop

Multi-alarm logic: Configurable LTEL/STEL, rising/falling, rate-of-change alarms

Front-panel display & LEDs: Local readout and status indication

Isolated monitoring output: Optional 4–20 mA retransmission to DCS/PLC

Remote inhibit/reset: External control for alarm suppression and reset

EEPROM configuration: Settings stored locally; no battery required

Applications

Industries: Oil & gas, petrochemical, power generation, pharmaceuticals, wastewater

Use Cases:

Fixed gas detection systems (toxic & flammable gases)

Safety monitoring in hazardous areas

Integration with plant DCS/PLC via 4–20 mA retransmission

High-integrity safety loops (single-channel mode)

Compatibility & Replacement

System Compatibility: Honeywell System 57 (5701 series racks)

Replacement Type: Direct drop-in for 05701-A-0301

Legacy Status: Obsolete (EOL); available as refurbished/used stock