Honeywell 2MLF-AC8A
Honeywell 2MLF-AC8A
Honeywell 2MLF-AC8A
Honeywell 2MLF-AC8A

Honeywell 2MLF-AC8A | Industrial Process Control Analog Input Unit for Sensor Signals

  • Brand: Honeywell
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    Model: 2MLF-AC8A
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    Product Type: Analog Input Module
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    Series: Field Device (Industrial I/O)
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    Core Function: Provides 8 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 controllers for monitoring and control.
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    Key Specs: 8 channels, ±0.1% full-scale accuracy, 2500VAC isolation, supports 4-20mA/HART/0-10V inputs, -40°C to +70°C operating temperature.
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Part number: Honeywell 2MLF-AC8A
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Description

2MLF-AC8A: Product Overview
The 2MLF-AC8A is an 8-channel analog input module designed for integration into industrial control systems, serving as a front-end interface for field sensor signal acquisition. It operates within distributed control system (DCS) or programmable logic controller (PLC) architectures, converting raw electrical inputs (e.g., 4-20mA, 0-10V) from sensors into calibrated engineering units (e.g., psi, °C, gpm) for controller processing. Its primary role is to enable reliable, high-resolution monitoring of critical process variables in environments where signal integrity and uptime are paramount, such as oil refining, chemical processing, and power generation.
Functionally, the module processes inputs from 8 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 mitigate ground loops and electromagnetic interference (EMI), a critical feature in electrically noisy industrial settings. As part of Honeywell’s Field Device series, the 2MLF-AC8A integrates with the brand’s unified engineering tools for simplified configuration and maintenance, aligning with compliance standards like IEC 61508 (SIL 2) and API 556 (refinery instrumentation). This design ensures seamless interoperability with Experion PKS and other Honeywell control platforms, reducing integration complexity.

Honeywell 2MLF-AC8A

Honeywell 2MLF-AC8A

2MLF-AC8A: Technical Specifications
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    Model Number: 2MLF-AC8A
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    Manufacturer: Honeywell
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    Product Type: Analog Input Module
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    Number of Channels: 8 (individually isolated)
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    Input Types: 4-20mA (HART 7 supported), 0-10V DC, 0-5V DC
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    Accuracy: ±0.1% of full scale (FS) at 25°C; ±0.2% FS over operating range
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    Resolution: 16-bit (65536 steps)
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    Isolation Voltage: 2500VAC (channel-to-channel, channel-to-bus)
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    Input Impedance: 4-20mA: 250Ω; 0-10V: ≥1MΩ
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    Power Supply: 24V DC (nominal, 18-30V DC range)
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    Power Consumption: 2.5W (typical, all channels active)
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    Operating Temperature: -40°C to +70°C
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    Humidity Range: 5% to 95% non-condensing
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    Certifications: SIL 2 (IEC 61508), CE, UL, ATEX Zone 2 (optional)
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    Dimensions: 120mm x 90mm x 45mm (width x height x depth, DIN-rail mount)
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    Weight: 0.3kg
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    Diagnostics: Open circuit, short circuit, overrange, HART communication status
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    Hot Swap Support: Yes (plug-and-play replacement without system shutdown)

    Honeywell 2MLF-AC8A

    Honeywell 2MLF-AC8A

Core Features & Customer Value​
High-Channel Density Reduces Cabinet Footprint: With 8 input channels per module, the 2MLF-AC8A minimizes I/O module count in control cabinets. For engineers designing systems with extensive analog sensing (e.g., a refinery’s distillation column with 6 pressure transmitters and 2 temperature sensors), this cuts cabinet space by 40% compared to 4-channel alternatives, simplifying wiring and material costs.
Galvanic Isolation Ensures Signal Integrity: The 2500VAC isolation between channels and the control 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 controller tools 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, critical for continuous processes like oil refining or municipal water treatment. Technicians simply remove the faulty unit and insert a new one; the controller automatically reloads configuration data. 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 safety instrumented system (SIS), the 2MLF-AC8A 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 Applications​
The 2MLF-AC8A is deployed in systems requiring reliable analog signal acquisition. In a petroleum refinery’s crude distillation unit, it connects 8 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 2MLF-AC8A interfaces with 8 RTD temperature sensors (via 4-20mA transmitters) and 2 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 4 turbidity meters (0-5V) across filtration basins. The controller uses these inputs to adjust chemical dosing, with diagnostics flagging a faulty pH probe before effluent violates EPA limits.

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