Description
Honeywell 05701-A-0361
Technical Specifications Single channel isolated analog output; output range 4-20mA corresponding to full scale gas concentration; backplane power supply from System 57 rack; galvanic isolation between rack logic side and field output side; operating temperature 0℃ to 55℃; storage temperature -40℃ to 85℃; humidity 5% to 95% non-condensing; support output calibration through rack local interface; compliant with gas detection system related standards.
Functional Features It receives gas concentration data from System 57 rack controller via internal backplane bus. It converts digital gas measurement value into linear 4-20mA current output signal for retransmission to external systems. It provides galvanic isolation to block ground loop between gas rack and external DCS cabinets. It supports output zero and span adjustment. It diagnoses output circuit fault and reports fault state to System 57 controller. It holds predefined fault current value when internal failure occurs.
Application Scenarios Gas concentration retransmission to DCS for refinery gas detection loops; analog signal output for gas monitoring cabinets of chemical tank farms; remote indicator driving for offshore platform gas detectors; signal isolation transmission for System 57 gas detection systems.
Performance Parameters Output linearity error less than 1% full scale; isolation voltage meets industrial signal isolation requirement; output current stability maintains within tolerance under temperature variation; fault state current value is fixed for upper system fault recognition.
Material Composition PCB substrate is FR4 flame retardant board with conformal coating; precision digital-to-analog conversion chip and isolation power component; gold-plated backplane edge connector; front panel adopts anti-corrosion cold rolled steel; passive components are industrial grade wide temperature devices.
Structural Characteristics Vertical plug-in card matching System 57 rack slot; front panel has channel status and fault LED indicators; elastic locking latches on both sides; terminal pin definition printed on panel surface; passive convection cooling design.
Working Principle The System 57 rack controller transmits gas concentration digital value to the module through the rack backplane. The digital signal enters the DAC conversion circuit, which generates the corresponding 4-20mA current. The isolation circuit separates the rack internal logic circuit from the external output loop. If the module detects DAC circuit failure, it forces the output to preset fault current value and upload fault alarm to the rack controller.
Installation Requirements Insert the card into the corresponding slot of System 57 gas rack. Connect external 4-20mA receiving equipment to the output terminals on the front panel. Complete output calibration after installation. Use shielded twisted pair cable for external retransmission wiring. Separate analog output cables from power cables. Cabinet grounding resistance ≤4Ω.
Usage Notes Do not connect external voltage source to the analog output terminals. Confirm full scale range setting matches the gas detector range. Wear anti-static wrist strap during replacement. Verify retransmission value consistency with gas detector reading after calibration.
