WhatsApp : +88 01818929292 / +8801730296909
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WhatsApp : +88 01818929292 / +8801730296909
info@smmarineservice.com sohelbhuiyan1213@gmail.com arafatbhuiyan3657@gmail.com
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Nakakita Temperature Controller for Tank Cleaning Sea Water Heater (NS TB732 Automatic Controller)

Item Code:

Nakakita Temperature Controller

Brand:

Nakakita Seisakusho Co., Ltd.

Condition:

Refurbished


Nakakita Temperature Controller for Tank Cleaning Sea Water Heater (NS TB732 Automatic Controller)

Technical Guide | Manual | Repair | Spare Parts | Troubleshooting | Worldwide Supplier

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Title

Nakakita Temperature Controller for Tank Cleaning Sea Water Heater (NS TB732) – Manual, Repair, Spare Parts & Marine Supplier | SM MARINE SERVICE™


Description

Manufacturer

Nakakita Seisakusho Co., Ltd.

Country of Origin

Japan

Product Type

Marine Mechanical / Pneumatic Automatic Temperature Controller

Model

NS TB732 Automatic Controller

Marine Application

Tank Cleaning Sea Water Heater Temperature Control System


Product Introduction

The Nakakita NS TB732 Temperature Controller is a precision mechanical-pneumatic temperature controller developed for automatic regulation of Tank Cleaning Sea Water Heater systems onboard ships. It maintains the desired outlet water temperature by modulating the steam control valve, ensuring stable heating performance while protecting the heater and downstream equipment from overheating.

Unlike fully electronic controllers, the NS TB732 offers excellent reliability in harsh marine environments because it operates using pneumatic control principles with minimal dependence on electronic components. This makes it a preferred solution on many cargo vessels, chemical tankers, product tankers, and offshore ships.

SM MARINE SERVICE™ supplies complete Nakakita temperature controllers, refurbished units, spare mechanisms, control elements, seal kits, gauges, pneumatic components, and repair services for worldwide marine customers.


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What is the Nakakita NS TB732 Temperature Controller?

The NS TB732 is an automatic controller that continuously senses the temperature of the heated seawater and compares it with the operator's set value.

If the measured temperature falls below the set point, the controller increases the pneumatic output to open the steam control valve. If the temperature exceeds the set point, it reduces the output pressure, causing the valve to close gradually. This closed-loop control maintains a stable water temperature for safe and efficient tank cleaning operations.


Working Principle

The controller operates through the following sequence:

  1. Temperature is sensed at the heater outlet.
  2. The sensing element compares actual temperature with the set point.
  3. Internal proportional and reset mechanisms calculate the correction.
  4. Pneumatic control pressure is increased or decreased.
  5. The steam control valve modulates automatically.
  6. The outlet water temperature stabilizes at the desired value.

This continuous modulation prevents rapid temperature fluctuations and improves heating efficiency.


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Main Components

The Nakakita NS TB732 controller typically consists of:

  • Temperature sensing mechanism
  • Proportional band adjustment dial
  • Reset time adjustment dial
  • Air pressure regulator
  • Pneumatic relay
  • Nozzle and flapper assembly
  • Steam valve output mechanism
  • Mechanical linkage
  • Indicator scale
  • Calibration adjustment system
  • Protective enclosure
  • Manual adjustment controls

Key Features

  • Fully automatic temperature regulation
  • Pneumatic control output
  • High reliability
  • Stable proportional control
  • Adjustable reset time
  • Compact marine design
  • Low maintenance
  • Long operational life
  • Resistant to vibration and engine room conditions
  • Suitable for continuous marine service

 

Technical Specifications

 
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The Nakakita NS TB732 Automatic Temperature Controller is a precision pneumatic temperature controller designed for automatic regulation of steam-heated seawater systems used during cargo tank cleaning operations. It ensures stable outlet temperature by continuously modulating the steam control valve according to the process demand.

Item Specification
Manufacturer Nakakita Seisakusho Co., Ltd.
Country of Origin Japan
Model NS TB732
Product Type Automatic Temperature Controller
Control Method Mechanical / Pneumatic
Controlled Medium Steam Control Valve
Application Tank Cleaning Sea Water Heater
Air Supply Instrument Air
Mounting Local Heater Control Panel
Marine Application Tank Cleaning Heating System

The NS TB732 is built for long-term operation with minimal maintenance and can be serviced by replacing individual internal components such as diaphragms, pneumatic relays, nozzles, springs, gauges, and adjustment mechanisms.

SM MARINE SERVICE™ supplies complete controllers, refurbished units, spare mechanisms, overhaul kits, and repair services.


Marine Applications

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The Nakakita NS TB732 controller is widely installed on:

  • Tank Cleaning Sea Water Heaters
  • Steam Heated Water Systems
  • Cargo Tank Heating Systems
  • Fuel Oil Heating Systems
  • Marine Steam Control Stations
  • Utility Heating Systems
  • Boiler Auxiliary Equipment
  • Engine Room Heating Systems

Typical vessel applications include:

  • Chemical Tankers
  • Product Tankers
  • Crude Oil Tankers
  • LNG & LPG Carriers
  • Bulk Carriers
  • Container Ships
  • Offshore Support Vessels
  • FPSOs

Common Problems & Troubleshooting

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1. Temperature Cannot Reach Set Point

Possible causes:

  • Low steam pressure
  • Faulty steam control valve
  • Incorrect controller adjustment

Recommended actions:

  • Verify steam supply
  • Inspect the control valve
  • Recalibrate proportional band and reset settings

2. Temperature Fluctuates Excessively

Possible causes:

  • Incorrect proportional band setting
  • Reset time too short
  • Unstable instrument air pressure

Recommended actions:

  • Adjust proportional band
  • Increase reset time
  • Stabilize air supply pressure

3. Controller Output Does Not Change

Possible causes:

  • Blocked pneumatic nozzle
  • Damaged diaphragm
  • Internal relay failure

Recommended actions:

  • Clean nozzle and flapper
  • Replace diaphragm
  • Inspect pneumatic relay assembly

4. Steam Valve Does Not Respond

Possible causes:

  • Instrument air failure
  • Faulty actuator
  • Pneumatic tubing leakage

Recommended actions:

  • Check air pressure
  • Inspect actuator
  • Repair leaking air lines

5. Incorrect Temperature Indication

Possible causes:

  • Faulty sensing element
  • Mechanical linkage wear
  • Calibration drift

Recommended actions:

  • Inspect temperature sensing system
  • Replace worn linkage
  • Perform complete calibration

Preventive Maintenance

Routine maintenance should include:

Daily

  • Verify outlet temperature
  • Check instrument air pressure
  • Observe steam valve operation

Weekly

  • Inspect pneumatic tubing
  • Check for air leakage
  • Verify controller response

Monthly

  • Clean external mechanism
  • Test proportional control
  • Check reset adjustment
  • Verify temperature accuracy

Annually

  • Replace diaphragms if necessary
  • Clean nozzle and flapper assembly
  • Inspect internal springs
  • Calibrate the controller
  • Perform complete functional testing

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Common Spare Parts

Frequently requested spare parts include:

  • NS TB732 Complete Controller
  • Pneumatic Relay Assembly
  • Diaphragm Kit
  • Nozzle & Flapper Assembly
  • Proportional Band Mechanism
  • Reset Mechanism
  • Adjustment Knobs
  • Pressure Gauge
  • Instrument Air Filter
  • O-Ring Kit
  • Seal Kit
  • Internal Springs
  • Mechanical Linkage
  • Temperature Sensing Assembly
  • Complete Overhaul Kit

SM MARINE SERVICE™ supplies complete controllers, refurbished units, repair kits, and compatible spare parts according to customer requirements.


Why Ships Continue Using the Nakakita NS TB732

The Nakakita NS TB732 continues to be installed on many vessels because it offers:

  • Proven Japanese reliability
  • Stable temperature regulation
  • No complex electronic circuitry
  • High resistance to vibration
  • Excellent long-term accuracy
  • Low maintenance requirements
  • Easy onboard servicing
  • Long service life
  • Worldwide availability of spare parts
  • Excellent compatibility with marine steam heating systems

Frequently Asked Questions (FAQ)

What is the main function of the NS TB732?

It automatically regulates the temperature of the tank cleaning seawater heater by controlling the steam valve through a pneumatic output signal.

Does the controller require electricity?

No. The controller primarily operates using mechanical and pneumatic principles with instrument air, making it highly reliable in marine environments.

Can the controller be calibrated onboard?

Yes. Qualified marine engineers can adjust the proportional band, reset time, and calibration settings during routine maintenance.

What are the most common failures?

Typical failures include air leakage, worn diaphragms, clogged nozzles, incorrect controller adjustment, and calibration drift.

Does SM MARINE SERVICE™ supply complete controllers and spare parts?

Yes. We supply new, used, and professionally reconditioned Nakakita NS TB732 controllers, overhaul kits, pneumatic components, repair services, and worldwide technical support.


Short Product Description

The Nakakita NS TB732 Automatic Temperature Controller is a marine-grade pneumatic controller developed to maintain stable water temperature in Tank Cleaning Sea Water Heater systems. Its precise proportional control, rugged mechanical construction, and dependable operation make it an excellent solution for cargo tank heating and marine steam control applications.


User Manual & Technical Resources

Typical technical documentation includes:

  • Nakakita NS TB732 Operator Manual
  • Installation Manual
  • Service Manual
  • Maintenance Manual
  • Calibration Manual
  • Pneumatic Circuit Diagram
  • Steam Control Valve Adjustment Guide
  • Spare Parts Catalogue
  • Troubleshooting Guide
  • Commissioning Manual

Why Choose SM MARINE SERVICE™

SM MARINE SERVICE™ specializes in marine automation, pneumatic controllers, steam control systems, boiler automation, and engine room instrumentation.

Our services include:

  • New Marine Equipment
  • Used Marine Equipment
  • Professionally Reconditioned Equipment
  • Worldwide Shipping
  • Genuine & Compatible Spare Parts
  • Controller Repair & Overhaul
  • Calibration & Commissioning Support
  • Technical Consultation
  • Emergency Marine Equipment Sourcing

SM MARINE SERVICE™

Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh

China Warehouse & Support Center
Shanghai, China

Website
www.smmarineservice.com

Email
info@smmarineservice.com

WhatsApp
+8801818929292

Marketing Contact
Nazmul Hasan Bhuiyan


Conclusion

The Nakakita NS TB732 Automatic Temperature Controller is a trusted and highly reliable solution for controlling Tank Cleaning Sea Water Heater systems on commercial vessels. Its pneumatic operating principle, precise temperature regulation, and durable Japanese engineering provide consistent performance even in demanding engine room environments.

Whether you require a complete Nakakita NS TB732 controller, pneumatic relay, diaphragm kit, temperature sensing assembly, overhaul kit, calibration service, or compatible spare parts, SM MARINE SERVICE™ offers professional technical support, quality marine equipment, and fast worldwide delivery to help keep your vessel's heating system operating safely and efficiently.

 


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