Red Lion Controls APLR1 Programmable Logic Controller

Red Lion Controls APLR1 is an Apollo-time-base rate indicator designed to translate pulsed input into a clear, real-time rate readout for industrial monitoring and control tasks. It accepts magnetic pickup signals and digital logic inputs (including +5 V logic levels and higher) and uses a configurable time-base to compute rate, making it suitable for tachometer-style applications across rotating equipment, conveyors, and pumps. Weighing about 1.5 lbs (0.8 kg), the compact panel-mount module fits into standard electrical enclosures and is designed for industrial environments. The APLR family is referenced in Red Lion literature as an older design; Red Lion notes newer designs are available under the PAXLR and PAXR lines, maintaining similar rate-indication capabilities with updated interfaces. This device emphasizes display and rate measurement rather than programmable control logic, making it ideal when a precise pulse-rate readout is the primary requirement. Typical use cases include speed indication from magnetic pickups on motors or gearboxes, rpm monitoring for machine tooling, and process lines where continuous rate visualization supports operator awareness and automatic control loops.