{"product_id":"honeywell-05701-a-0284-system-57-series","title":"Honeywell 05701-A-0284 System 57 Series","description":"\u003cp\u003eThe \u003cstrong\u003eHoneywell 05701-A-0284\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003e05701-A-0284\u003c\/strong\u003e Catalytic Sensor Drive, operates as a dedicated hardware component for conditioning and processing flammable gas signals within System 57 rack platforms.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e05701-A-0284\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eHoneywell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eUnited Kingdom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003eApproximately 0.45 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e5.00 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003eStandard System 57 single-width card form factor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-10 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e3.5 W (typical, depending on sensor drive current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003eCatalytic bead (pellistor) bridge input\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003eAnalog 4-20 mA current loop output, local status relays\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control \u0026amp; Gas Detection Integration\u003c\/h3\u003e\n\u003cp\u003eThe 05701-A-0284 acts as a specialized catalytic bead sensor interface card, executing signal conditioning and threshold evaluation directly at the hardware layer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePellistor Bridge Driving:\u003c\/strong\u003e The module supplies a constant, regulated excitation current to external pellistor sensors. It continuously measures the millivolt imbalance of the Wheatstone bridge caused by gas combustion on the active element.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-20 mA Loop and Channel Isolation:\u003c\/strong\u003e The input bridge signal is processed and converted into a standard 4-20 mA HART compatible analog output loop. Galvanic channel-to-channel isolation safeguards internal rack processing cards from field wiring faults and line surges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocal Alarm Relay Control:\u003c\/strong\u003e Houses configurable SPCO output relays to actuate local audible or visual alarms directly when combustible gas concentrations breach pre-defined Lower Explosive Limit (LEL) setpoints.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e How is the catalytic sensor drive current adjusted on this module?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e The bridge excitation current must be calibrated manually using the onboard potentiometers. Technicians must match the current exactly to the specifications of the connected catalytic sensor model to prevent thermal burnout of the active elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Can this card be inserted or removed under power (hot-swapping)?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the card is physical-key rated for live slot insertion. However, pulling an active card will instantly open the associated 4-20 mA loop and any field trip circuits. Ensure the linked shutdown loops are placed in bypass before extraction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e How does the card signal a field sensor fault?\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA:\u003c\/strong\u003e In the event of a sensor open-circuit or short-circuit, the 05701-A-0284 drives its analog output down scale (typically below 3.0 mA) and energizes the dedicated fault relay to notify the supervisory DCS.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcitation Voltage Verification:\u003c\/strong\u003e Before connecting the catalytic sensor field wiring, verify that the card's bridge voltage matches the sensor datasheet. Incorrect excitation voltage will permanently damage catalytic pellistors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree-Wire Shield Termination:\u003c\/strong\u003e Field connections must utilize high-quality three-core shielded cabling. Terminate the cable shield at the system rack grounding bar only. Do not ground the shield at the sensor housing to avoid noise-generating ground loops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirmware and Calibration Setup:\u003c\/strong\u003e Following hardware mounting, the sensor zero and span calibrations must be verified under stable ambient flow conditions using certified span gas mixtures.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":48167324090558,"sku":"05701-A-0284","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0725\/1145\/5422\/files\/screenshot_2026-07-16_12-10-40.png?v=1784177181","url":"https:\/\/www.autooiltech.com\/products\/honeywell-05701-a-0284-system-57-series","provider":"AutoOilTech Limited","version":"1.0","type":"link"}