• Core Function: Provides 16 isolated analog input channels to acquire process signals (e.g., 4-20mA, 0-10V) from field sensors (pressure, temperature, flow) and transmit calibrated data to ControlEdge C300 controllers for monitoring and control.
Manufacturer: Honeywell Part number: Honeywell 900R12-0300
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900R12-0300: Product OverviewThe 900R12-0300 is a 16-channel analog input module designed for integration into Honeywell’s ControlEdge™ C300 distributed control system (DCS). It serves as a front-end interface for acquiring continuous process signals from field-mounted sensors, converting raw electrical inputs (e.g., 4-20mA, 0-10V) into calibrated engineering units (e.g., °C, psi, gpm) for controller processing. Its primary role is to enable reliable, high-resolution monitoring of critical process variables in industries where precision and uptime directly impact safety, efficiency, and regulatory compliance.Functionally, the module processes inputs from 16 independent channels, each configurable for 4-20mA (with HART 7 support), 0-10V DC, or 0-5V DC signals. It employs galvanic isolation (2500VAC) to prevent ground loops and electromagnetic interference (EMI) from corrupting data, a critical feature in electrically noisy industrial environments. As part of the C300 I/O family, the 900R12-0300 integrates with the platform’s high-speed I/O link, hot-swappable architecture, and unified engineering tools (ControlEdge Builder), simplifying configuration and maintenance. This design aligns with applications requiring compliance to IEC 61508 (SIL 2) and adherence to standards like API 556 (refinery instrumentation) or ASME PTC 19.3 (temperature measurement).
• Power Supply: 24V DC (nominal, 18-30V DC range) from C300 chassis
• Power Consumption: 3W (typical, all channels active)
• Operating Temperature: -40°C to +70°C
• Humidity Range: 5% to 95% non-condensing
• Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
• Dimensions: 25mm x 128mm x 115mm (width x height x depth, fits C300 I/O slot)
Honeywell 900R12-0300
Core Features & Customer ValueHigh-Channel Density Reduces Cabinet Footprint: With 16 input channels per module, the 900R12-0300 minimizes the number of I/O modules required in a control cabinet. For engineers designing systems with extensive analog sensing (e.g., a refinery’s distillation column with 12 pressure transmitters and 4 temperature sensors), this cuts cabinet space by 50% compared to 8-channel alternatives, simplifying wiring and reducing material costs.Galvanic Isolation Ensures Signal Integrity: The 2500VAC isolation between channels and the C300 bus prevents ground loops and EMI from industrial equipment (e.g., motors, drives) from distorting analog signals. In a chemical plant’s reactor monitoring system, this ensures accurate pressure readings—critical for preventing over-pressurization—even near high-power agitators.HART 7 Support for Enhanced Diagnostics: Integration with HART 7 protocol allows the module to transmit diagnostic data (e.g., sensor calibration status, loop resistance) alongside process variables. Engineers can retrieve this data via ControlEdge Builder to identify failing transmitters (e.g., a corroded pH sensor) before they impact product quality, reducing unplanned downtime by up to 25%.Hot-Swappable Design Minimizes Downtime: The module can be replaced while the system remains powered, essential for continuous processes like oil refining or municipal water treatment. Technicians simply remove the faulty unit and insert a new one; the C300 controller automatically reloads configuration data via I/O link. This eliminates scheduled shutdowns for module replacement, saving thousands in lost production per incident.SIL 2 Certification for Safety-Critical Applications: When integrated into a Honeywell Safety Manager SIS, the 900R12-0300 meets SIL 2 requirements (IEC 61508), enabling its use in safety functions like reactor overtemperature monitoring or pressure relief valve interlocks. Its fault-tolerant design (hardware fault tolerance ≥1) reduces the probability of dangerous failures, aligning with audit requirements for regulated industries.Typical ApplicationsThe 900R12-0300 is deployed in systems requiring reliable analog signal acquisition. In a petroleum refinery’s crude distillation unit, it connects 16 4-20mA pressure transmitters monitoring column stages. The module’s ±0.1% accuracy ensures optimal separation efficiency, while HART diagnostics alert staff to a transmitter drift before product purity degrades.At a chemical plant’s polymerization reactor, the 900R12-0300 interfaces with 12 RTD temperature sensors (via 4-20mA transmitters) and 4 flow meters (0-10V). Its 2500VAC isolation prevents EMI from agitators from causing false readings, ensuring precise control of reaction kinetics. Hot-swap capability allows maintenance during planned turnarounds without halting production.In a municipal water treatment plant, the module monitors 8 pH sensors (4-20mA) and 8 turbidity meters (0-5V) across filtration basins. The C300 controller uses these inputs to adjust chemical dosing, with diagnostics flagging a faulty pH probe before effluent violates EPA limits.
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