Honeywell FL2R-12J6H Proximity Switch

Honeywell FL2R-12J6H Proximity Switch

The Honeywell / Yamatake FL2R-12J6H is a heavy duty DC two-wire square inductive proximity switch designed for high-reliability sensing in harsh industrial and marine automation applications. This sensor has a tough 30×30 mm resin body and has a nominal sensing distance of 12 mm, with improved resistance to electromagnetic interference, electrical noise and high-vibration stress.

The FL2R-12J6H is a Normally Open (N.O.) output unit for precise non-contact detection of metal and has a wide supply voltage range of 10 to 30 VDC. Dual-color LED indicators provide real-time operation and setting feedback, enabling easy calibration during installation. IP67 rated, it is sealed against moisture, oil and harsh saline air, making it an indispensable replacement part for shipboard control systems, cargo valve positioners and heavy industrial machinery.

Model Details

• Manufacturer Part Number (MPN): FL2R-12J6H
• Manufacturer: Honeywell Automation
• Product Series: FL2R / FL2 Series DC 2-Wire Square Proximity Switches
• Enclosure Style: Square / Block Type (30 mm x 30 mm x 52.5 mm)
• Sensing Face Orientation: Top / Front Sensing Surface

Key Features

1. Polarity-Independent DC 2-Wire Output: Drastically cuts installation time and field wiring labor by reducing wire count compared to traditional 3-wire systems.
2. Dual-LED Setup Indicator: Displays output activation (Red) and stable sensing zone (Green) for rapid alignment and optical troubleshooting without external meters.
3. Integrated Circuit Protection: Built-in safeguards against power surge spikes, inverse load connection, and transient short circuits.
4. IP67 Hermetic Oil-Resistant Enclosure: Precision-molded PBT resin housing designed to withstand continuous exposure to hydraulic fluid, diesel mist, and saltwater fog.
5. High Shock & Vibration Resistance: Rated to withstand up to 50 G structural impact and continuous vibration, preventing false trips on heavy machinery.

Applications

• Marine Engine Room Automation: Main engine fuel rack position detection, turning gear safety interlocks, and lube oil pump valve limits.
• Cargo Handling & Deck Machinery: Anchor windlass brake position sensing, hatch cover locking indication, and crane slewing limits.
• Process Valve Actuation: Hydraulic and pneumatic actuator limit indication in hazardous or demanding fluid control loops.
• CNC & Machine Tools: High-speed spindle positioning, tool turret indexing, and work-piece detection.
• Automated Material Handling: Conveyor line sorting, pneumatic cylinder position verification, and heavy lift elevators.

Compatibility

• Azbil / Yamatake Automation Panels
• Honeywell Micro Switch System Controllers
• Siemens S7-1200 / S7-1500 Digital Input Modules (24VDC DC 2-wire compatible)
• Mitsubishi MELSEC iQ-R / FX-Series PLCs
• Nakakita Seisakusho & Danfoss Marine Actuators

Part Number Cross-References

• Azbil / Yamatake: FL2R-12J6H, FL2R-12J6HD, FL2R-12J6SV, FL2R-12J6H-F
• Honeywell: FL2R-12J6H
• Direct Alternatives: OMRON TL-W12MC1 (3-wire alternative), Pepperl+Fuchs NBB12-F25-E2, Balluff BES 516-326-E4-E-05.

From the Chief Engineer’s Desk:

When retrofitting or replacing the FL2R-12J6H on shipboard hydraulic valve actuators or main engine control racks, DC 2-wire leakage current is the number one issue engineers overlook. Always verify that your PLC input channel’s minimum off-state current is higher than the switch’s 0.8 mA maximum off-state leakage current. If your PLC module reads a false ‘ON’ due to leakage, install a parallel bleed resistor across the input terminals to pull down residual voltage.

Frequently Asked Questions

Can the Honeywell FL2R-12J6H be wired directly to a PLC input?

Yes, the FL2R-12J6H can be connected directly to standard 24VDC PLC digital input cards. Ensure the PLC input impedance is selected so that the sensor’s off-state leakage current (≤ 0.8 mA) does not register as a high logic state.

Is the Honeywell FL2R-12J6H waterproof?

Yes, the unit is sealed to IP67 standards, making it impervious to dust ingress and protected against temporary submersion in water. It is well suited for high-humidity, oily, and outdoor marine environments.

What target size provides the rated 12 mm sensing distance?

The rated 12 mm sensing distance is measured using a standard mild steel plate measuring 30 mm x 30 mm x 1 mm. Smaller targets or non-ferrous materials will reduce the effective sensing range.