Circuitron 800-5201 DT-1 Grade Crossing Detector

DT-1 Grade Crossing Detector

Details:

The Circuitron DT-1 is a bi-directional train detection system designed for DC-powered model railways, providing reliable and realistic activation of grade crossing signals, warning lights and other automated accessories. Using optical detection technology, the DT-1 senses the presence of trains without requiring any modifications to locomotives or rolling stock, making installation straightforward and compatible with virtually any train.

The system includes four Opto-Sensors, with two sensors assigned to each direction of travel. By monitoring track polarity, the DT-1 automatically determines train direction and activates only the relevant sensor pair. This intelligent operation ensures that crossing signals remain active while a train occupies the crossing and automatically switch off shortly after the last vehicle clears the protected area.

Independent sensitivity adjustments for each direction allow the DT-1 to be fine-tuned for varying room lighting conditions, helping to ensure reliable operation in a wide range of layouts and environments. The result is a practical and cost-effective solution for adding realistic crossing protection and train-activated accessories to DC railway systems.

The DT-1 provides a switched ground output capable of controlling DC-powered accessories drawing up to 250mA, making it suitable for crossing flashers, warning lights and other automated scenic effects. For layouts operating short trains or single locomotives, optional additional sensors can be installed to reduce the minimum detectable train length. Modellers seeking continuous detection of very short trains may wish to consider the more advanced DT-2 system.

Features:

• Detects trains without requiring modifications to locomotives or rolling stock
• Automatic bi-directional operation using track polarity detection
• Includes four Opto-Sensors with independent sensitivity adjustment for each direction

Additional Information:

• Detection Method: Optical (Opto-Sensors)
• Number of Sensors Included: 4
• Direction Detection: Automatic via track polarity
• Power Requirement: 10V – 18V AC or DC
• Recommended Power Supply: Filtered DC for optimum stability and adjustment
• Output Type: Switched ground/common (-)
• Maximum Output Current: 250mA
• Sensitivity Adjustment: Independent adjustment for each direction
• Rolling Stock Modification Required: No

Measurements:

• Length: 76.2 mm
• Width: 50.8 mm