TOKIMEC TD-310 Doppler Speed Log: Display Unit, Main Control Unit and CB-31 Control Box

 

Product Information

Manufacturer: TOKIMEC INC., now TOKYO KEIKI INC.

Manufacturer location: Tokyo, Japan. The individual unit’s manufacturing origin is not independently confirmed from the visible labels.

Model: TD-310

Product type: Marine ultrasonic Doppler speed and distance log

Associated unit: CB-31 control box

 

The TOKIMEC TD-310 Doppler Speed Log is a marine navigation instrument designed to measure a vessel’s speed through water and distance travelled. Its paired-beam ultrasonic pulsed Doppler method is designed to reduce measurement errors caused by vessel motion. The manufacturer’s product information describes the TD-310 as meeting applicable IMO performance requirements.

 

The supplied photograph shows a TD-310 display, a TD-310 main control unit and a CB-31 control box. The equipment labels show a date of 2004-1. The visible display includes speed in knots, FORE/AFT indication, distance counters, limit indicators and CLEAR, SELECT and ACK controls.

 

How the TD-310 Works

The system transmits ultrasonic energy into the water and processes returning echoes to calculate speed through water. Its paired-beam design directs sound forward and aft to reduce errors associated with ship motion and steady inclination. Echoes from approximately three metres below the hull help reduce the influence of the vessel’s wake. The transducer installation is designed not to protrude below the hull, reducing exposure to floating debris and eliminating the need to retract it during routine port entry.

 

Main Features

• Paired-beam ultrasonic pulsed Doppler measurement

• Speed range of -10 to +30 knots

• Three-digit digital speed display

• Ahead and astern direction indication

• Two distance counters, with stored data retained in non-volatile memory

• Serial speed and distance outputs using IEC 61162-1 VBW and VLW sentences

• 200 pulses per nautical mile contact outputs

• 4–20 mA current output and a voltage output

• Support for up to three display units and four analogue meters, subject to the system configuration

• Self-check function, seawater-temperature correction and transducer mounting-error correction

 

Technical Specifications

Operating method: Ultrasonic paired-beam pulsed Doppler

Operating frequency: 2 MHz

Speed range: -10 to +30 knots

Speed accuracy: ±0.1 knot

Distance range: 0.0–9999.9 nautical miles

Distance accuracy: ±1%

Speed indication: Three-digit LED display

Direction indication: Ahead green; astern red

Speed output: IEC 61162-1 VBW, 4–20 mA and voltage signal

Distance output: IEC 61162-1 VLW and 200 pulses/NM contact signals

Power supply: Manufacturer literature lists AC 100/110/115/220 V, 50/60 Hz, single phase, with specified tolerance; confirm the exact unit rating plate before connection

Power consumption: 50 VA maximum, according to manufacturer product specifications

Operating temperature: -15°C to +55°C, according to manufacturer product specifications

 

Output quantity, cable configuration, supported displays and interface settings should be checked against the installed system’s documentation before commissioning or replacement.

 

Main Components

• TD-310 display unit: Shows speed, ahead/astern direction, distance counters and limit indicators.

• TD-310 main control unit: The pictured assembly carries the system’s main control-unit identification label. Confirm the exact internal configuration against the equipment documentation.

• CB-31 control box: Identified on the lower nameplate in the supplied photograph.

• Transceiver and transducer: Part of the wider TD-310 system; exact installed types must be verified from the ship’s configuration documents.

• Cables and connectors: Carry power and system signals between the installed units.

 

Marine Applications

The TD-310 is designed for marine navigation on coastal and ocean-going vessels. Speed-through-water and distance data may be supplied to compatible bridge equipment, voyage monitoring systems and other navigation interfaces when correctly configured. Compatibility with a specific radar, ECDIS, VDR, autopilot or other receiver depends on the interface, sentence support, wiring and installation design; it should not be assumed from the speed-log model alone.

 

Common Problems and Troubleshooting

No display or no power: Check the approved supply rating, upstream protection, isolator, cable condition and connectors. Electrical checks should be carried out by qualified personnel.

 

Speed reading absent or unstable: Inspect the relevant system indications and connections. Consider transducer condition, installation, marine growth, cable damage or a fault in the transceiver/control electronics. Follow the approved manual and shipboard procedures.

 

Incorrect speed or direction: Compare readings with suitable independent references and review installation alignment and the transducer mounting-error correction. Do not adjust calibration without the correct procedure.

 

Distance counter or output problem: Confirm which display and output circuit are involved. Check configured interfaces and cable continuity, then verify VBW/VLW or pulse outputs with suitable test equipment and approved documentation.

 

Intermittent operation: Inspect connectors, cable routing, supply stability and signs of moisture or corrosion. Do not open energized equipment or bypass protective circuits.

 

Common Alarms and Fault Messages

The supplied photograph does not establish a specific fault code, and no unverified alarm codes are listed here. The ACK key indicates an acknowledgement function, but the exact alarm behaviour should be confirmed in the correct TD-310 operator manual and the installed configuration.

 

Maintenance Tips

• Keep the display and control-unit enclosures clean, dry and securely mounted.

• Inspect external cables, plugs, glands and bonding/earthing arrangements according to shipboard procedures.

• Check speed and distance outputs as part of planned navigation-equipment maintenance.

• Keep the correct manual, wiring diagrams, configuration details and previous service records with the equipment.

• Have transducer inspection, calibration corrections and internal repairs performed by qualified service personnel.

• Confirm model, supply voltage, connector arrangement and software/configuration requirements before fitting a replacement.

 

Spare Parts & Replacement Availability

SM MARINE SERVICE™ can assist with sourcing the TOKIMEC TD-310 Doppler Speed Log, TD-310 display units, main control units, CB-31 control boxes, cables, connectors and other identifiable system components, subject to availability. New, used, refurbished, reconditioned and tested working equipment may be available depending on stock and inspection results.

 

The visible labels identify the TD-310 and CB-31, but do not show a fully legible part number for every internal component. Please share clear nameplate photographs, the required unit name, any readable part number and the vessel’s supply/interface details when requesting a quotation. Compatibility should be confirmed before ordering.

 

Why Ships Continue to Use Doppler Speed Logs

A speed log provides speed-through-water data and distance information that support navigation and operational monitoring. The TD-310 combines a paired-beam measurement approach with multiple output options and stored distance counters. Where a vessel already has the system installed, maintaining serviceable units and verifying compatible replacements can help reduce unnecessary changes to the bridge installation.

 

Frequently Asked Questions

What is the TOKIMEC TD-310? It is an ultrasonic paired-beam Doppler speed log that measures a vessel’s speed through water and distance travelled.

 

Who manufactures the TD-310? It was produced under the TOKIMEC name; the manufacturer is now TOKYO KEIKI INC. The pictured equipment label states TOKIMEC INC., Tokyo, Japan.

 

Is the TD-310 still available? Availability of new equipment should be checked. Used or serviceable units and spare parts may be obtainable subject to stock and condition.

 

Where can I buy a TD-310 or CB-31 control box? Contact SM MARINE SERVICE™ with the exact model, photographs and required quantity to check sourcing options and shipping.

 

Are TD-310 spare parts available? Availability depends on the specific part, its identification and stock. The display, control unit, CB-31, cables and related components can be checked individually.

 

Can I buy a used or refurbished TD-310? Used, refurbished, reconditioned or tested equipment may be available depending on supply. Request the unit’s condition and testing details before purchase.

 

What are common TD-310 faults? Possible symptoms include loss of display, unstable or missing speed data, distance/output issues and intermittent operation. Diagnosis must be based on the actual symptoms and approved service documentation.

 

Where can I obtain the TD-310 manual? Ask SM MARINE SERVICE™ for assistance locating the appropriate operator or service documentation. Verify the document revision and system configuration before maintenance.

 

Can SM MARINE SERVICE™ supply worldwide? Worldwide sourcing and shipping support can be discussed when requesting a quotation; destination, availability and shipping terms must be confirmed.

 

Short Product Description

TOKIMEC TD-310 Doppler Speed Log with display unit, main control unit and CB-31 control box. Designed to measure ship speed through water and distance using 2 MHz ultrasonic paired-beam pulsed Doppler technology. Contact SM MARINE SERVICE™ for spare parts, replacement-unit sourcing and worldwide supply enquiries.

 

User Manual & Technical Resources

The manufacturer publishes TD-310 product information and technical specifications. For operator, installation and service manuals, request the appropriate document through SM MARINE SERVICE™ and confirm the revision matches the installed equipment. No unverified direct manual-download links are included here.

 

SM MARINE SERVICE™

Marine Automation & Navigation Equipment Supplier

 

Available Condition:

• New Equipment • Used Equipment • Refurbished Equipment • Reconditioned Equipment

 

Stock Location:

• Bangladesh • China

 

Services:

• Worldwide Shipping • Technical Support • Spare Parts Supply • Marine Equipment Sourcing

 

Contact Information

SM MARINE SERVICE™ Samir Market, DT Road, Pahartali, beside CDA Market, Chattogram, Bangladesh

Mobile / WhatsApp / Viber: +88 01818 929292

Email: info@smmarineservice.com

Website: www.smmarineservice.com

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