Description
Product Introduction & Engineering Value
The 05701-A-0301 sits at the individual-channel level of a Honeywell 5701 System 57 gas-detection rack. It processes the signal from the associated sensor-drive circuit, presents the gas reading and channel status on the front panel, evaluates programmed alarm thresholds, and communicates alarm information to other system cards.
This distinction is important during replacement. The 0301 is the 4–20 mA version, while the closely related 0302 is intended for catalytic detectors. Honeywell documentation also shows the 05701-A-0283 4–20 mA Sensor Drive Module as part of the 0301 architecture.
Technical Specifications
- Manufacturer: Honeywell Analytics / Sieger
- Part Number: 05701-A-0301
- System: Honeywell System 57 / 5701
- Card Type: Single Channel Control Card
- Input Configuration: 4–20 mA
- Detection Channels: One
- Associated Sensor Drive: 05701-A-0283
- Control Method: Microprocessor-controlled
- Configuration Memory: EEPROM
- Front Display: LCD gas-reading and channel-status display
- Alarm Indication: A1, A2, A3 and Fault LED indications
- Local Controls: Reset / Select push-button
- Optional Expansion: Analogue Output Module
- System Supply: System 57 uses a nominal 24 VDC supply, with documentation specifying an 18–32 VDC operating range for the system.
The control card performs more than simple signal conversion. Honeywell’s operating documentation describes processing of the incoming sensor signal, display of the measured level, comparison against predefined alarm limits, activation of alarm indicators and optional relays, and transmission of alarm-status information to other cards.
05701-A-0301
05701-A-0301
Field Application & the “Trench” Experience
Consider a legacy fixed gas-detection rack protecting a process area where one channel begins showing an intermittent fault. The field detector and 4–20 mA loop test correctly, but the corresponding System 57 channel continues to report abnormal status. A technician working through the rack-level diagnostics may isolate the problem to the channel control card rather than replacing the detector unnecessarily.
That is where the 05701-A-0301 becomes useful. The replacement needs to be matched to the existing 4–20 mA channel architecture, sensor-drive arrangement, configuration, and alarm logic. Simply selecting another System 57 card with a similar appearance is not sufficient.
Specific application scenarios
- Fixed toxic-gas monitoring — individual 4–20 mA detector loops connected to a System 57 rack.
- Combustible-gas detection — channel-level alarm processing where the detector provides a 4–20 mA signal.
- Process-area gas monitoring — individual detection channels requiring local indication plus rack-level alarm reporting.
- Legacy fire-and-gas infrastructure — maintaining an installed System 57 rack where replacement cards are required without redesigning the complete detection system.
Honeywell’s product documentation lists 05701-A-0301 specifically among System 57 spares for the 4–20 mA Single Channel Control Card.
Transparency SOP: QA & Testing
For New Surplus 05701-A-0301 inventory, a meaningful inspection should include:
- Part-number verification — confirm the board marking corresponds to 05701-A-0301.
- Physical inspection — check the PCB, card edge, connectors, front-panel display, LEDs, switches, and mounting hardware.
- Sensor-drive verification — confirm the supplied configuration is appropriate for the 4–20 mA architecture.
- Power-up test — verify correct System 57 rack operation without introducing a live gas-detection channel into an unsafe test condition.
- Signal simulation — where appropriate test equipment is available, apply a controlled 4–20 mA simulation and verify indication and configured alarm responses.
- Configuration check — confirm EEPROM-stored application parameters before returning the card to service.
The lifecycle needs attention as well. Current aftermarket documentation describes this part as discontinued/obsolete, while Honeywell’s published System 57 documentation remains useful for identifying the original card function and system relationship.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Ordering 05701-A-0302 instead of 05701-A-0301.
The two numbers look almost identical. They are not interchangeable by default. Honeywell identifies 0301 as the 4–20 mA control card and 0302 as the catalytic version.
⚠️ Trap #2 — Replacing the control card without checking the sensor-drive module.
The 0301 architecture uses the 05701-A-0283 4–20 mA Sensor Drive Module. Check the complete channel assembly rather than treating the control card as an isolated component.
PRO TIP: Record the existing card’s configuration before removal. The System 57 control card stores software configuration in EEPROM, so a replacement may require configuration verification before the channel can be returned to service.
⚠️ Trap #3 — Testing a gas-detection card like an ordinary analog I/O module.
The 05701-A-0301 participates in alarm generation, fault handling, display, and system-level status reporting. A basic power-on test does not prove that the complete safety-monitoring channel is correctly configured.
Dynamic FAQ
What is Honeywell 05701-A-0301?
It is the System 57 / 5701 Single Channel Control Card for 4–20 mA gas-detection applications. It processes one detector channel and provides local display, alarm processing, and system status functions.
What is the difference between 05701-A-0301 and 05701-A-0302?
The 05701-A-0301 is the 4–20 mA version, while 05701-A-0302 is the catalytic version. The appropriate card depends on the detector and sensor-drive architecture installed in the System 57 rack.
Does 05701-A-0301 provide a gas reading on the front panel?
Yes. Honeywell’s System 57 documentation describes a front-panel LCD that displays the gas signal/reading and channel status, together with LEDs for alarm and fault conditions.
Does the card retain its configuration?
Yes. The System 57 documentation states that the control-card software configuration is stored in EEPROM. Configuration should therefore be checked when installing a replacement card.
Is 05701-A-0301 obsolete?
Current component-market documentation lists the part as discontinued/obsolete, while Honeywell’s archived documentation identifies it as a System 57 spare. Availability therefore depends largely on remaining original, surplus, refurbished, or service inventory.
Can New Surplus 05701-A-0301 be supplied with a warranty?
Yes, depending on the supplier. The seller should state whether the unit is unused original surplus, refurbished, or previously installed, and specify the actual warranty period. For a gas-detection application, functional test documentation is also worth requesting before purchase.
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