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3. Key Technical Specifications
The Honeywell 05701-A-0293 is a single-channel control card designed to receive, process, and display signals from 2-wire or 3-wire 4–20 mA gas detectors within the System 57 rack architecture.
| Parameter | Value |
| Part Number | 05701-A-0293 |
| Manufacturer | Honeywell Analytics (Zellweger Analytics) |
| System Compatibility | System 57 19-Inch Control Racks |
| Input Signal | 4–20 mA sink/source from toxic, flammable, or oxygen sensors |
| Relay Outputs | 3 Programmable Alarm Relays (A1, A2, A3) + 1 Fault Relay |
| Display | Front panel backlit LCD with engineering units and bar graph |
| Power Consumption | 3.5 W maximum (supplied via System 57 backplane) |
| Operating Temperature | -10°C to +55°C |
| Signal Accuracy | ±1% of full-scale reading |
| Status Indicators | Front-panel LEDs for Power, Fault, Alarm 1, Alarm 2, Alarm 3 |
4. Product Introduction & Supply Chain Strategy
The Honeywell 05701-A-0293 is a single-channel signal processing card built for the System 57 gas detection architecture. It interprets 4–20 mA analog feedback from remote gas sensors, drives local display readings, and toggles safety interlock relays to activate ventilation fans, deluge systems, or emergency shutdowns upon gas detection.
Maintaining a spare 05701-A-0293 card as New Surplus is a crucial risk-management measure for facility safety compliance. If a gas monitor channel card fails, safety regulations often require halting production in that monitoring zone until coverage is restored. Sourcing an uninstalled, original New Surplus unit ensures immediate plug-and-play restoration of your safety monitoring loop without waiting on extended factory lead times or risking false alarms from degraded, second-hand boards.
05701-A-0293
05701-A-0293
5. Installation & Configuration Guide
Critical Life Safety Warning
System 57 control cards drive hazardous gas alarm trip circuits. Swapping or configuring a channel card while safety interlocks are live can trigger false trips or disable emergency gas mitigation systems. Always inhibit active safety loops before performing maintenance.
1.Channel Inhibit & Data Logging:Prerequisite.
Activate the channel inhibit mode on the System 57 rack or master control panel. Record the sensor gas type, range, alarm setpoints, and relay configurations from the existing card or system documentation.
2.Power Isolation & Removal:Extraction.
Loosen the top and bottom captive screws on the 05701-A-0293 front panel. Carefully pull the card ejector handles outward to release the edge connector from the System 57 backplane, then slide the card out smoothly.
3.Jumper Setup & Card Insertion:Configuration.
Set DIP switches and configuration jumpers on the replacement 05701-A-0293 board to match the original card’s settings (sensor current mode and relay operation). Slide the card into the rack guide rails and push firmly to seat the rear connector. Tighten captive screws.
4.Calibration & Loop Test:Commissioning.
Apply rack power. Clear the channel inhibit status and perform a zero/span calibration using certified test gas at the remote sensor. Verify that alarm LED thresholds and relay outputs toggle correctly.
6. Firmware/Software Versions & Upgrade Notes
- Software Compatibility: Fully compatible with Honeywell System 57 configuration software tools and front-panel engineering cards.
- Hardware Jumpers: Ensure onboard jumpers for 2-wire vs. 3-wire 4–20 mA transmitter loops are set correctly prior to slotting the card into an energized backplane.
- Backward Compatibility: Direct drop-in replacement for earlier revision cards in the 05701 series; no backplane wiring changes are required.
- Calibration Precaution: Replacing a card requires re-zeroing and re-spanning the connected gas detector. Never rely on factory default settings for life safety gas trip thresholds.
7. Frequently Asked Questions (FAQ)
Q: Is this Honeywell 05701-A-0293 card genuinely new, or is it pulled from a decommissioned rack?
A: This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Q: Why should I purchase New Surplus instead of a cheaper refurbished gas control card?
A: Life safety equipment must not depend on refurbished components. Used gas control cards often suffer from aged electrolytic capacitors, degraded relay contacts, and drifted analog-to-digital converters that cause false trips or unrecorded gas leaks. New Surplus guarantees original manufacturing tolerances and total operational integrity.
Q: Can I replace a 05701-A-0293 card while the rest of the System 57 rack is powered?
A: Yes, System 57 cards are designed for card-slot extraction, provided the specific channel is placed in Inhibit mode first to prevent downstream alarm relay activation during handling.
Q: Does this card supply power to the field gas detector?
A: Yes. The 05701-A-0293 provides regulated DC loop power through the System 57 backplane to drive standard 2-wire or 3-wire 4–20 mA gas transmitters.
Q: What warranty and quality verification accompany this unit?
A: Every 05701-A-0293 card is shipped in static-shielding protective packaging, accompanied by an inspection report, and backed by a full 1-year replacement warranty from the date of shipment.
