Red Lion LD4 series is a large 4 inch LED display counter/rate indicator designed for long‑distance viewing in industrial environments. This unit (model label LD4B6P on the rear) is used and fully functional, with cosmetic wear, rust and label staining from previous service.
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Brand: Red Lion Controls
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Series: LD4 large display counter / rate indicator
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Model marking: LD4B6P (LD4B series 6‑digit display, see rear label in photos)
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Display: 4 inch (approx. 101 mm) high red LED digits, 6‑digit display readable up to about 180 ft (55 m)
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Inputs: 2 signal inputs (INP A, INP B) plus reset and user inputs, supporting multiple counter/rate modes (per connection diagram on rear label)
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Communications: RS‑232 and RS‑485 serial ports (screw terminals on rear, shown in wiring diagram)
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Power: 120/240 VAC universal input (see rear label; buyer should confirm exact supply on their unit)
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Outputs: Relay option board with 2 form C relay contacts rated up to 5 A at 250 VAC / 30 VDC for control/alarms (see relay spec area on label)
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Enclosure: Rugged painted metal housing with front red lens and side‑mounted cable glands; top mounting brackets fitted as shown
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Used, removed from a working installation and powers up correctly (display digits bright and segments working, as shown in photos)
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Significant cosmetic wear: paint scratches, rust on brackets and screws, staining/corrosion marks on rear labels and around cable glands
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Some dirt and residue on front lens; may benefit from careful cleaning by the buyer
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Existing field wiring and glands are still attached; buyer may wish to re‑terminate to suit their installation
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No original box, manuals, or accessories included
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Front panel has several user labels (e.g. “Counter/Speed”) from the previous application; these can be left in place or replaced as needed.
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Configuration of scaling, input type, and relay setpoints is via front‑panel keys and/or serial communications; buyer should refer to the Red Lion LD4 series manual for full programming instructions.
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As with all used industrial electronics, installation and wiring should be carried out by a qualified technician, and suitability for safety‑critical applications should be verified by the end user.
