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Product Overview

The Honeywell 05701-A-0302 serves as a high-performance, single-channel control card for the System 57 gas detection platform. This module interfaces directly with catalytic bead sensors (mV) or 4–20 mA transmitters to provide continuous atmospheric monitoring in hazardous zones. Featuring a sophisticated four-part liquid crystal display (LCD) and a dedicated alarm reset button, the 05701-A-0302 delivers instantaneous visual feedback on gas concentrations, alarm status, and system health. It eliminates measurement ambiguity by combining a 25-segment analog bar graph with a precise four-character digital readout. This card acts as the intelligence hub for localized gas safety, triggering alarms and protective actions when gas levels exceed user-defined setpoints.

Technical Specifications

Category Specification Details
Model Number 05701-A-0302
System Series Honeywell System 57
Display Type Four-Part LCD (Analog Bar Graph + Digital/Message/Icons)
Input Compatibility Catalytic (mV) or 4–20 mA Current Loop
Resolution 1% FSD (Full Scale Deflection) steps
Visual Indicators LEDs for A1, A2, A3 Alarms, Fault, and Inhibit
DC Supply 18V to 32V DC
Power Consumption 3.75W Typical (Catalytic) / 3.25W Typical (4-20mA)
Accuracy ±0.5% FS typical
Electronic Drift < ±2% per 6 months
Dimensions 17.0 x 2.5 x 11.2 cm
Weight 0.165 kg (Shipping Weight: 1.5 - 2.0 kg)

Engineering Advantages

  • Elimination of Calibration Drift: The 05701-A-0302 features a potentiometer-free design. By utilizing digital parameters instead of mechanical trimmers, the card eliminates the risk of settings shifting due to vibration or component aging, ensuring long-term setpoint stability.

  • Un-ambiguous Multi-Data Display: The integrated LCD provides three distinct data streams simultaneously: an analog trend bar for rapid visual checks, a digital value for precise concentration readings, and a message display for system status. This ensures operators identify fault conditions or alarm levels instantly without misinterpretation.

  • Sensor Performance Validation: Integrated software routines allow for sensor performance checking directly from the control card. This proactive diagnostic feature identifies aging sensors before they fail, allowing maintenance teams to schedule replacements during planned shutdowns.

  • Peak Reading Retention: The card records and displays peak gas concentration readings. This capability allows safety officers to investigate "hidden" gas releases that may have occurred between shift inspections, providing a more comprehensive site safety profile.

  • Galvanic Signal Isolation: Robust galvanic isolation separates the field sensor input from the system backplane. This architecture prevents ground loops and suppresses electrical noise interference, maintaining high signal-to-noise ratios even in electrically "noisy" industrial environments.

FAQs

  • Can I use this card with both 3-wire and 2-wire transmitters?Yes. The versatile input stage supports both catalytic sensors (mV) and standard 4–20 mA current loop transmitters (2-wire or 3-wire), provided the signal is configured within the 12-bit A/D range.

  • Does the 05701-A-0302 include the alarm reset button?Yes, this specific model features a front-panel push-button for Alarm Reset and Card Selection, allowing for immediate local interaction without requiring a separate master module.

  • Is this product 100% Brand New and Original?We guarantee that every 05701-A-0302 we supply is 100% Brand New and Original Honeywell equipment. We ship units in original factory packing to ensure full technical traceability and performance.

  • How do I configure the alarm setpoints?The card is fully configurable through the System 57 engineering software or the master module interface. You can set the resolution for alarm points in 1% FSD steps across the entire range.

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