Description
Product Overview
The Honeywell 05701-A-0302 is a single-channel catalytic gas control card for the Honeywell System 57 gas detection rack, originally under Honeywell Sieger brand. It powers and reads catalytic bead combustible gas sensors to measure gas concentration in %LEL, processes alarm logic, performs continuous sensor health diagnostics and provides local display. This legacy rack card is widely used on refineries, offshore platforms, chemical plants and gas compressor stations, supplied as spare replacement parts for existing System 57 gas safety systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Part Number | 05701-A-0302 |
| Brand | Honeywell (Sieger) |
| Type | Single Channel Catalytic Gas Control Card |
| Compatible Platform | Honeywell System 57 Gas Detection Rack |
| Supported Sensor | Catalytic bead combustible gas detector |
| Measurement Range | 0–100% LEL |
| Backplane Supply | 18 ~ 32V DC |
| Typical Power Consumption | 3.75W (including catalytic sensor) |
| Front Display | 25-segment bar graph + 4-digit numeric + message display |
| Status LEDs | A1 / A2 / A3 Alarm, Fault, Inhibit |
| Local Button | Alarm Reset / Card Select |
| Alarm Setpoint Resolution | 1% FSD step |
| Long Term Drift | Less than ±2% over 6 months |
| Operating Temperature | -5°C ~ +55°C |
| Storage Temperature | -25°C ~ +70°C |
| Humidity | 5~95% RH, non-condensing |
| Dimensions | 170 × 25 × 112 mm |
| Net Weight | 165 g |
| Certifications | CE |
| Product Status | OEM discontinued, aftermarket spare only |
Key Features
- Dedicated drive and signal conditioning for catalytic bead combustible gas sensors, %LEL gas concentration monitoring
- Three independent configurable alarm stages A1, A2, A3 for staged gas hazard alerts
- Built-in sensor fault diagnostics: open circuit, short circuit and sensor burnout detection
- Integrated multi-section front panel display and dedicated status LEDs for local reading
- Alarm inhibit and alarm reset function for maintenance lockout
- 1-inch narrow rack form factor for System 57 chassis slots
- Calibration is performed using the System 57 engineering card (05701-A-0361) for zero and span adjustment
Installation & Testing Notes
- Insert the card into the assigned slot inside Honeywell System 57 rack
- Verify wiring polarity of catalytic bead sensor before applying rack DC power
- After power-up, inspect front panel display and LED indicators
- Use 05701-A-0361 engineering card to complete zero and span calibration
- Apply certified test gas to validate gas reading accuracy and alarm triggering
- This card does NOT support hot swap. Isolate rack backplane power before removal
- Re-calibrate sensors periodically according to site safety maintenance schedule
FAQ
Q: What sensor does 05701-A-0302 interface with? A: Catalytic bead combustible gas sensors for %LEL flammable gas measurement.
Q: Which rack system does this card belong to? A: Honeywell System 57 gas detection rack.
Q: Which part number is required for calibration? A: 05701-A-0361, System 57 engineering card.
Q: Is hot swap available? A: No, backplane power must be disconnected before installing or removing the card.
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