Honeywell 05701-A-0302 Low-Drift Gas Monitoring Card for System 57 Racks

Brand Honeywell

Model Honeywell 05701-A-0302

Product Overview

The HONEYWELL 05701-A-0302 is a single-channel catalytic control card engineered specifically for the Honeywell System 57 gas detection platform, serving as the critical interface between field-mounted combustible gas sensors and plant alarm or shutdown systems . As a member of the 5701 series, the HONEYWELL 05701-A-0302 processes signals from catalytic bead sensors to detect combustible gases such as methane, propane, and hydrogen, converting sensor resistance changes into precise gas concentration readings displayed on the front-panel LCD .

The HONEYWELL 05701-A-0302 is distinguished by its microprocessor-controlled architecture, which manages sensor excitation, signal conditioning, alarm comparison, and self-verification of circuit components, software operation, and sensor health . Configuration settings are stored securely in EEPROM, ensuring retention through power cycles and facilitating rapid module replacement without reprogramming . The card occupies a single slot in a standard 19-inch System 57 rack and supports hot-swap sensor replacement, minimizing downtime during maintenance .

Designed for high-integrity safety applications, the HONEYWELL 05701-A-0302 delivers three-level alarm outputs (A1, A2, A3) with relay contacts for driving annunciators, ventilation systems, or emergency shutdown interlocks . An optional analog output module provides isolated 0-20mA or 4-20mA signals for remote monitoring via chart recorders or DCS integration . With electronic drift of less than ±2% per six months, the HONEYWELL 05701-A-0302 maintains measurement accuracy with minimal calibration intervention, a critical advantage for continuous process operations in oil refineries, chemical plants, and wastewater treatment facilities .

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	HONEYWELL 05701-A-0302
Manufacturer	Honeywell
Product Type	Single Channel Catalytic Control Card
Product Series	5701 / System 57
Compatible Sensor Type	Catalytic bridge (combustible gas)
Input Signal	Catalytic sensor resistance change
Alarm Outputs	A1, A2, A3 relays + fault relay (SPDT)
Alarm Resolution	1% full-scale deflection (FSD) steps
Display	25-segment analog bar, 4-digit numeric, 4-character message LCD
DC Supply Voltage	18–32 V DC
Power Consumption (Catalytic)	3.75 W typical (including sensor)
Electronic Drift	< ±2% per 6 months
Operating Temperature	-20°C to +50°C
Dimensions (L × W × H)	17.0 cm × 2.5 cm × 11.2 cm
Weight	0.165 kg

Main Features and Advantages

Dedicated Catalytic Sensor Signal Processing: The HONEYWELL 05701-A-0302 incorporates specialized excitation and measurement circuitry optimized for catalytic bridge sensors, unlike generic analog input cards. This dedicated hardware design compensates for ambient temperature effects on sensor sensitivity, ensuring superior linearity and stability when detecting methane, propane, and other combustible gases .

Three-Level Alarm Architecture with Configurable Thresholds: The HONEYWELL 05701-A-0302 supports A1, A2, and A3 alarm levels with setpoint resolution of 1% full-scale deflection, enabling precise threshold configuration for staged safety responses . Each alarm level drives dedicated LED indicators and relay outputs, allowing operators to distinguish between warning, high-alarm, and critical conditions without ambiguity.

Comprehensive Self-Verification and Fault Detection: The HONEYWELL 05701-A-0302 continuously monitors its own circuit components, software execution, and connected sensor status . A front-panel Fault LED illuminates upon detecting open circuits, short circuits, or sensor degradation, enabling maintenance teams to address issues before alarm integrity is compromised .

Modular Rack Design with Engineering Card Integration: The HONEYWELL 05701-A-0302 occupies a single 2.54 cm slot in System 57 racks, supporting high-density installations . When paired with an engineering card (05701-A-0361), operators gain access to advanced diagnostics including sensor zero/span calibration, alarm setpoint adjustment, and sensor life monitoring, all through a common interface .