Description
Honeywell Sieger 05701-A-0302 | System 57 Catalytic Gas Control Card
Product Introduction
In hazardous industrial facilities, oil refineries, and offshore production platforms where the accumulation of explosive gases poses a constant threat, reliable and direct combustible gas monitoring is vital. The Honeywell 05701-A-0302 is the industry-standard System 57 (5701) Single Channel Control Card configured specifically for catalytic bridge-type flammable gas sensors (utilizing the built-in 05701-A-0282 bridge sensor drive module). Originally developed under the trusted Sieger brand, this microprocessor-managed card supplies bridge excitation power, linearizes sensor response, and manages local alarms for explosive gas hazards.
Designed as a slide-in modular circuit card for System 57 subracks, the 05701-A-0302 features a clear 4-part liquid crystal display with a 25-segment gas concentration bar graph alongside dedicated LED indicators for A1, A2, and A3 gas alarm levels, fault codes, and inhibit status. Its non-volatile EEPROM stores custom configuration data, while front-panel tactile push-buttons allow local resetting and calibration functions. Whether replacing an aging controller or supporting an established life-safety rack, this unit drops seamlessly into existing System 57 chassis frameworks.
05701-A-0302
Key Technical Specifications
| Parameter | Specification Metric |
| Device Category | Single Channel Catalytic Gas Detection Control Card |
| System Platform | Honeywell / Sieger System 57 Architecture |
| Input Signal Compatibility | Direct catalytic bridge combustible gas sensors (Fitted with 05701-A-0282 Bridge Drive) |
| Display Type | 4-part LCD (25-segment bar graph, 4-character digital/message readout) |
| Alarm Indicators (LEDs) | A1, A2, A3 Gas Alarms, Fault, and Inhibit status |
| Configuration Storage | Onboard EEPROM for user-defined span, zero, and alarm parameters |
| Operating Voltage | 18V to 32V dc (Powered via rack backplane) |
| Dimensions & Weight | 17 cm \times 2.5 cm \times 11.2 cm / Approx. 0.165 kg |
| Operating Temperature | -25^\circC to +55^\circC standard industrial tier |
Application Scenarios & Pain Points
- Combustible Gas & Methane Monitoring: Industrial compressor skids, fuel gas trains, and tank farms require fast-acting catalytic sensor channels that can detect lower explosive limit (LEL) concentrations before ignition thresholds are reached.
- Offshore Production Safety Racks: Space-constrained control environments rely on the high channel density of System 57 sub-racks to consolidate numerous explosive gas loops into a single architecture.
- Legacy Safety Maintenance: Keeping older Sieger-based gas detection loops fully functional without executing expensive, full-scale system retrofits requires exact-match replacement controller cards.
QA & Live Testing SOP (Trust Signal)
We don’t warehouse legacy safety control cards without verifying bridge excitation stability and microprocessing integrity; every 05701-A-0302 unit goes through our rigorous bench protocol:
- Visual & Edge-Connector Audit: Inspected under optical magnification for gold-finger trace cleanliness, secure component soldering, and complete absence of environmental corrosion.
- Dynamic Rack Power-Up: Slotted into an authorized System 57 test chassis to verify clean power rail handshakes, EEPROM configuration reading, and LCD/LED segment initialization.
- Catalytic Bridge Simulation: Tested using specialized bridge circuit simulators to validate sensor voltage balancing, zero/span calibration tracking, and A1/A2/A3 trip thresholds.
- Protective Packaging: Sealed inside heavy-duty anti-static barrier bags and cushioned within high-density structural foam to prevent electrostatic and transit shock damage.
Field Engineer’s Pitfall Guide
- ❗ Electrostatic Discharge (ESD) Precaution: Always wear a properly grounded wrist strap when handling or installing this control card; static charges can easily damage onboard CMOS components.
- ❗ Sensor Drive Module Matching: Ensure the card features the correct input drive variant (the 05701-A-0282 for catalytic bridges); installing it into a loop wired for 4-20 mA transmitters without checking drive configuration will result in hardware errors.
- ❗ Bridge Zeroing Procedure: When commissioning or swapping a catalytic card, ensure the field sensor is in a clean-air environment before performing the initial zero balance adjustment.
Intent-Driven FAQ
What is the primary difference between the 05701-A-0301 and 05701-A-0302 cards?
The 05701-A-0302 is engineered specifically for direct catalytic bridge flammable gas sensors (like the Sieger Searchpoint), whereas the 05701-A-0301 is designed for standard 4-20 mA loop-powered transmitters.
Can an analog output module be added to this catalytic control card?
Yes. An optional Analogue Output Module (such as part 05701-A-0285) can be plugged directly onto the single channel control card to provide a remote 4-20 mA retransmission output of the gas concentration readings.
What causes a “Fault” LED to light up on a catalytic channel card?
A fault status typically points to a broken detector filament, an open or shorted bridge cabling loop, an out-of-range zero offset, or an internal card diagnostic error.
Can this control card be hot-swapped in an active rack?
While System 57 hardware supports modular replacement, standard plant safety guidelines and management-of-change (MOC) protocols for life-safety systems normally require isolating channel logic or de-energizing the loop prior to card extraction.
What kind of warranty covers this surplus control module?
Every unit is backed by our comprehensive replacement guarantee, supported by multi-point pre-shipment bench testing to ensure absolute reliability out of the box.
