Occupancy Detectors

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Occupancy Detectors are used as part of a signalling system to detect the presence or absence of a train. Their feedback can control signals or lamps on dispatcher's panels, allowing for smooth, prototypical train movements.

Occupancy Detectors

A number of commercial versions are available from various DCC manufacturers. Many suppliers of DCC systems also have accessory lines including detection devices.

Some are also available as do-it-yourself projects

Digitrax

Detection

BDL168
  • LocoNet Occupancy
  • 16 detection sections
  • Three amps per section
BDL16

BDL16: Released in 2000 BDL162 replaced it in 2002, upgrade kit was available. Superseded by the BDL168 in 2004.

BD4
  • Works with the DS64 or SE8C
  • * Also works with the DS54
  • LocoNet detection for 4 occupancy detection sections via the DS64 or SE8C stationary decoders
  • Not recommended for use with SuperSonic decoders.
RX4
  • Transponding Receiver Add-on for BDL Series Detectors
  • Adds up to eight transponding sections to the BDL168
RD2
  • RD2 Remote Sensing Diodes for BDL16 series occupancy detectors
  • Remote sensing of two detection sections
  • Eliminates the need to run heavy wire between the BDL168, BDL16 or BDL162 and remote track sections

Detection and Power Management

BXP88
  • LocoNet Occupancy Detector
  • * occupancy
  • * transponding
  • * track power
  • Eight Detection Sections
  • Transponding
  • * One per detection section
  • Power Management
  • * One for each detection section
  • * Three Amps per section
  • * Eight Amps total
  • LED output for indication of Section occupancy, Transponding, and power status.
BXPA1
  • LocoNet device
  • DCC Auto-Reverser
  • One reversing Section or sub-district
  • Detection for one auto-reversing section
  • Transponding
  • Power Management
  • LED indicators

Additional connections:

  • Outputs for opt-isolated occupancy dectector output
  • manual power control
  • Status indication

Lenz

Lenz has the LB101, which contains two independent occupancy detectors.

NCE

BD20 Block Detector

Detects presence of a locomotive a section of track. Also works with resistor wheel sets NO Switch, triggered by current flowing through a current transformer Logic Output Must be used with an AIU to interface with a Signal

AUI01

Auxiliary Input Unit (AIU01)

  • connect up to 14 external devices to the Command Station via the Cab Bus
  • Switch contacts
  • Block Detectors (BD20)
  • Other sensors

DCC Specialties

Block Watcher

  • Solid State: Fast, all solid-state design with reliable quiet electronics.
  • No Power Supply Needed
  • Very Low Voltage Drop: The resistance is less than 0.060 Ohms, very small voltage drop.
  • Adaptive Block Leakage Detection: Electronically determines the amount of leakage current in the block when power is turned on. The current can also be set with a CV value up to about 130 mA.
  • Stabilized Setting for Current Trip Level: This prevents the block detection from fluttering on and off when the current is near the trip level.
  • Block Detection Option: Block detection can be turned on with an Accessory Command for testing signals even with nothing in the block. This feature can also be used to turn the signals red to protect a crossing.
  • Block Detection Output Isolated from Track Power: The output switch is totally isolated from the track power. This eliminates many wiring problems when combining signal circuits and track power.
  • Outputs for LED Indicator: A single LED output can be used for a remote location.

Circuitron

These are primarily designed for use with Analog AC or DC operations, but can be used with DCC.

BD-2 Block Occupancy Detector

  • Current sensing train detector circuits
  • Can provide 2 color (Red/ Green) signal outputs for an isolated block of track.
  • BD-2 and BD-2HD can be used with common rail wired AC or DC track power
  • Will work with most Command Control systems
BD-2HD Block Occupancy Detector

For S Scale and larger.

BD-1 Heavy Duty Block Occupancy Detector

  • Optical Detection system
  • 250mA output
  • Can power lamps or LEDs

BD-1HD Heavy Duty Block Occupancy Detector

  • Optical Detection system
  • 500mA output
  • Can power lamps or LEDs

DIY

Circuitous.ca

Block Occupancy Detector For DCC
Schematics available
PCBs can be ordered from the site.