Product Core Brief
- Model: 05701-A-0301
- Brand: Honeywell (Zellweger Analytics / Sieger)
- Series: System 57 / Sieger 5701
- Core Function: Provides control, display, and alarm facilities for a connected 4-20mA gas detector.
- Product Type: Single Channel Control Card (4-20mA Input)
- Key Specs: 4-20mA Input | Microprocessor Controlled | 3U Card Format
- Condition: New Original (New Surplus)
Product Introduction
The Honeywell 05701-A-0301 is a single-channel control card designed specifically for the System 57 (Sieger) gas detection architecture. It serves as the dedicated interface for monitoring industrial gas detectors that output a standard 4-20mA signal.
Unlike passive I/O cards, this module features an integrated microprocessor and local display. The front panel provides a 25-segment analog bar graph and a 4-character digital readout for real-time gas concentration monitoring. It also includes dedicated LEDs for A1, A2, and A3 alarms, as well as fault and inhibit status indicators. The module’s software configuration is stored in an EEPROM, making it fully definable for various application requirements.
HONEYWELL 05701-A-0301
Key Technical Specifications
| Parameter | Value |
|---|---|
| Module Type | Single Channel Control Card |
| Signal Compatibility | 4-20mA Analog Input |
| OEM Part Number | 05701-A-0301 |
| Display | 4-Character Digital + 25-Segment Analog Bar Graph |
| Alarm Indicators | A1, A2, A3, Fault, Inhibit LEDs |
| Power Supply | 18 VDC to 32 VDC |
| Typical Power Consumption | 3.25 W |
| Alarm Setpoint Resolution | 1% FSD Step |
| Electronic Drift | < 2% / 6 Months |
| Form Factor | 3U Euro Rack Card (1″ wide) |
Quality Control Process (Engineer’s Perspective)
We don’t just box these and ship them. Here is our actual bench test workflow.
- Incoming Verification: We verify the serial number against OEM traceability records. A visual inspection checks the front panel display segments and ensures the backplane connector pins are not bent.
- Live Functional Test: We mount the unit in a live System 57 test rack. We inject a calibrated 4-20mA signal and verify the digital/analog display accuracy and LED alarm trigger points.
- Electrical Parameter Test: We measure the current draw at nominal 24 VDC to ensure it stays within the 3.25 W typical spec. Ground continuity to the card edge is verified.
- Configuration Verification: We read the EEPROM configuration via the Engineering Card port to ensure the software version is stable and matches the system matrix.
- Final QC & Packaging: The module is sealed in an anti-static bag with silica gel. A QC sticker showing the test date and technician initials is applied to the exterior.
Replacement Pitfall Guide
Field replacements on gas detection systems are unforgiving. Watch out for these traps.
- Sensor Type Mismatch: ❗ Critical. The 05701-A-0301 is strictly for 4-20mA detectors. If your field device is a catalytic bead sensor, you must use the 05701-A-0302 variant instead. Installing the wrong card will result in immediate fault alarms.
- EEPROM Configuration Loss: The card’s configuration is stored in onboard EEPROM. When swapping cards, you must use the System 57 Engineering Card to transfer or re-download the configuration parameters to the new module.
- Display / LED Failure: The 25-segment analog bar graph uses individual LEDs that can burn out over time. Test all segments during commissioning to ensure the visual indication is fully functional for operators.
- Power Supply Mismatch: Verify your rack’s 24 VDC power supply has adequate headroom. Each 4-20mA card draws ~3.25 W; a fully populated 16-channel rack requires careful power budgeting.
- ESD Damage: The microprocessor and EEPROM are highly sensitive to electrostatic discharge. Always wear a grounded wrist strap when handling the bare PCB.
Keep these in mind and you’ll cut 90% of rework time.
HONEYWELL 05701-A-0301
Compatibility Matrix & Benchmarks
Compatibility
- Honeywell 05701-A-0301 Rev A → 05701-A-0301 Rev B : Direct Replacement — Verify firmware compatibility via Engineering Card.
- Honeywell 05701-A-0302 → 05701-A-0301 : Incompatible — 0302 is for catalytic sensors; 0301 is for 4-20mA transmitters only.
Benchmarks
- Display Update Rate: Real-time microprocessor polling
- Alarm Response: Instantaneous upon 4-20mA threshold breach
- Electronic Drift: < 2% over 6-month continuous operation
Need the Engineering Card configuration procedure for the Honeywell 05701-A-0301? I can pull up the step-by-step EEPROM programming guide so you can set the alarm setpoints and display scaling correctly.
