DIN rail twilight sensor ORNO OR-CR-231 with external boxed probe, 3000W, sensitivity 2–100 lx, IP65/IP20

ORNO OR-CR-231 is a DIN-rail mounted twilight sensor designed for automatic switching of lighting circuits based on ambient light levels. The device includes an external light probe contained in a weatherproof junction box, allowing accurate measurement of outdoor or sheltered locations while the DIN module remains installed in a distribution enclosure. The sensor is suitable for control of lighting loads up to 3000 W and offers an adjustable sensitivity range to match different installation conditions.

Advantages

The separated external boxed probe provides IP65 protection at the sensing point while the DIN module is protected to IP20, ensuring reliable operation in mixed indoor/outdoor configurations. Adjustable sensitivity from 2 to 100 lux allows precise dusk/dawn switching for varied environments. The DIN-rail format enables tidy installation in standard distribution panels and simplifies wiring to existing switchgear. The device supports a high switching capacity suitable for large lighting circuits.

Suitable for

• Automatic control of corridor and stairwell lighting
• Switching outdoor fixtures and façade illumination
• Industrial lighting where sensor must be mounted remotely from the distribution board
• Energy-saving lighting control in warehouses and service areas

Key specifications

• Mounting: DIN-rail module with external boxed light probe
• Switching capacity: up to 3000 W (resistive load)
• Sensitivity range: adjustable from 2 to 100 lux
• Probe protection rating: IP65
• DIN module protection rating: IP20

How to use

Install the DIN module on a standard 35 mm DIN rail inside the distribution cabinet and route the probe cable to the desired mounting location. Fix the external probe in a suitable position using the provided junction box to ensure the sensor faces ambient light without artificial interference. Connect the load and supply according to the wiring diagram provided by the manufacturer, then adjust the sensitivity control to the preferred lux level so the lighting switches at the required dusk/dawn point.

Usage recommendations

Position the external probe away from direct artificial light sources such as nearby lamps, reflected light from windows, or heat-emitting fixtures to avoid false switching. For outdoor applications, mount the boxed probe under a small overhang to reduce direct rain exposure, even though the probe itself is IP65. Verify load type and derating requirements when controlling inductive or capacitive loads and consult wiring instructions to ensure correct protective devices are used.