Tokyo-Keiki (TKK) Vietnam,Đầu dò TU51 Tokyo-Keiki (TKK)

The TD-310 Doppler Speed Log is designed in accordance with the requirements of IMO regulation and has high accuracy, many signals' output functions such as ship's speed and distance etc..
The size of units are reduced as small as possible (the display unit particularly is 1/14 in volume and 1/5 in mass compared to TD-501), and easy to install to ships such as coastal ships and ocean going ships.

The TD-310 adopts the paired-beam system in which the sonic energy is directed ahead and astern.This virtually minimizes doppler shift errors caused by the ship's motions. Furthermore, by receiving the echoes selectively from about 3 m below the ship's hull, the TD-310 minimizes adverse wake influences.

By virtue of its non-protruding, flush-mount design, the transducer of the TD-310 is completely free from the damage caused by drift ice or wood. Moreover, it need not be retracted before entering a port or extended after leaving it.

Total cumulative distance(DISTANCE 1) and distance since reset(DISTANCE 2) are memorized for each display unit.

Up to 3 Display units and 4 Analog meters can be connected.

 Auxiliary output signals as standard

  • Digital interface (IEC-61162-1 VBW,VLW) :8 circuits

  • 200 pulses/mile contact signals:8 circuits

  • Current signal (4-20 mA):1 circuit

  • Voltage signal:1 circuit

Low cost and simplicity of installation

  • All special cables are supplied by TOKYO KEIKI.

  • Size of main units are reduced and as a result, system can be installed with ease and low cost.
    Especially, the depth of the display unit is reduced to about 30 mm.


Operating method

Ultrasonic paired-beam pulsed doppler system

Operating frequency


Speed range

-10 knots to 30 knots

Speed display

3-digits numerical LED readout

Ahead/Astern indication

Ahead : green LED indication

Astern:red LED indication

Distance display

0.0 to 9999.9 nautical miles in LED

Distance 1 and distance 2 can be stored in non-volatile memory for each display unit


+/- 0.1 knot(speed) +/- 1%(distance)

Speed data output

IEC-61162-1 VBW sentence (8 circuits)

output period is variable between 0.5 and 9.9 sec.

Current signal (1 circuit)

4 mA = - 5 knots, 20mA=+25 knots

Voltage signal (1 circuit)

-3.2 V = -10 knots, 9.6 V =+30 knots

Distance data output

IEC-61162-1 VLW sentence(8 circuits)

output period is variable between 0.5 and 9.9 sec.

200 pulses/mile contact signals (8 circuits)

pulse width = 100ms (75ms-125ms)

Operating depth

3m(2m-5m variable)

Power supply

AC 100/110/115/220 V 50/60 Hz

Power consumption

Less than 50 VA

Operating temperature

-15 - 55 (Celsius)


Self check function, Analog meter connection, Sea water temperature automatic correction, Transducer mounting error correction

100% Japan Origin

Tokyo-Keiki (TKK) Vietnam

Model: TU51
 Used for TD310
 Cable length: 20m
 Note: Length of cable could be changed due to actual condition of customer.


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