Specifications

The only non-optical detection system on the market that provides block detection without interference to the
electrical power operating your trains. This means that all carrier operated layouts need not worry about
distortion of their signal to the track. Conventional operators will not suffer from any loss of power or the need
of separate power sources for each block detector used! The TRAK-DT family of devices provide detection by
sensing the flow of electrical current in a wire that is passed through a hole in the detection coil of the device
(similar to clamp on current probes). These devices are electrically isolated, but function as if they are in
series with the current flow. See page 41 for basic wiring diagram.
The basic TRAK-DT activates its double pole, double throw (DPDT) relay when current flow is sensed and
the relay is relaxed when current ceases to flow. By connecting the relay to lights, accessories, other
electronic devices, signals or even track power, all forms of automation and/or indications become possible. A
two pin connector is available so that an additional relay (Item 555) can be added when extra contact sets are
required.
To detect a train on the track it is necessary to isolate a section of rail (for 3-rail, center rail is easiest) defining
the block length and to pass the wire feed for this rail section through the detection coil of the TRAK-DT. By
inter-connecting several TRAK-DT's (one per block) complex signal systems can be installed, including fully
automatic operation if so desired. The TRAK-DT is also equipped with a RED LED which illuminates when the
TRAK-DT senses current flow. The RED LED provides for an easy visual indication for activation.
It is also necessary to provide power for the electronics. In order for the electronics to function properly it is
essential that a "regulated" power supply of 12 VDC be employed. This 12 VDC power is only for the
electronics and has absolutely nothing to do with track power. Failure to use a "regulated" 12 VDC can cause
erratic functioning or actual destruction of the TRAK-DT which is not covered under warranty. The 12VPS
(item 369, pg 35) is ideal for this function.
37
Item # 365
TRAK-DT
Block Detector - current sensed
for: SIGNALS - both TWO and THREE aspect types
AUTOMATIC POWER ROUTING
MULTIPLE TRAIN OPERATION such as Train following Train
wire passes
through
hole in
sense coil
RED LED
sense
indicator.