MMC D-2401-2 Closed Type UTI Meter

Overview

MMC D-2401-2 Closed Type UTI Meter | Genuine Gas-Tight Portable Ullage Temperature Interface Gauge for Marine Tankers

Accurate cargo measurement is essential for safe tanker operations, cargo custody transfer, inventory verification, and environmental compliance. Marine operators require portable gauging equipment that delivers precise measurements while preventing the release of hazardous vapours during inspection. The MMC D-2401-2 Closed Type UTI Meter has earned a worldwide reputation as one of the most dependable portable gauging instruments for these demanding applications.

Also known as the MMC D-2401-2 Gas-Tight UTI Meter, MMC Closed Type UTI Meter, MMC Tri-Mode Gauging Tape, or MMC Portable UTI Meter, this instrument is engineered for closed (gas-tight) tank gauging. It performs three essential measurements—ullage, cargo temperature, and oil/water interface detection—using a single intrinsically safe portable unit. It is designed to operate with compatible vapor control valves, allowing measurements without opening the cargo tank to the atmosphere.

At Ship Care Service, we supply genuine MMC D-2401-2 Closed Type UTI Meters, replacement parts, accessories, and technical support for shipowners, marine service companies, offshore operators, oil terminals, and cargo survey organizations worldwide.

What is the MMC D-2401-2 Closed Type UTI Meter?

The MMC D-2401-2 Closed Type UTI Meter is a portable Tri-Mode (UTI) electronic gauging instrument developed for gas-tight cargo tank measurements. It combines three critical measurement functions into a single device:

• Ullage Measurement

• Cargo Temperature Measurement

• Oil/Water Interface Detection

Because the instrument operates through an approved vapor control valve, cargo tanks remain closed throughout the measurement process. This reduces vapor emissions, minimizes operator exposure to hazardous gases, and helps maintain cargo quality.

Why Gas-Tight Closed Gauging Is Important

Modern tanker operations increasingly require closed gauging systems to improve operational safety and comply with environmental regulations.

Opening cargo tanks during measurement may result in:

• Release of hydrocarbon vapours

• Increased fire and explosion risks

• Exposure of crew to toxic gases

• Product contamination

• Environmental emissions

The MMC D-2401-2 Closed Type UTI Meter enables operators to perform measurements through a sealed system, significantly reducing these risks while maintaining reliable cargo data.

Why Marine Professionals Choose the MMC D-2401-2

For decades, MMC portable gauging instruments have been used aboard commercial tankers around the world because of their durability and dependable performance.

The D-2401-2 Closed Type is valued for:

• High measurement repeatability

• Gas-tight closed operation

• Intrinsically safe design

• Integrated ullage, temperature, and interface functions

• Rugged construction for harsh marine environments

• Long service life

• Straightforward operation

• Worldwide acceptance in marine cargo operations

Its proven performance makes it a preferred choice for ship operators, marine surveyors, cargo inspectors, and terminal personnel.

How the MMC D-2401-2 Closed Type UTI Meter Works

The instrument uses a precision measuring tape fitted with an electronic sensing probe.

During operation:

Step 1 – Secure Connection

The gauge is connected to an approved MMC vapor control valve installed on the cargo tank.

Step 2 – Lowering the Probe

The operator carefully lowers the electronic probe into the cargo tank using the precision measuring tape.

Step 3 – Ullage Measurement

When the probe reaches the cargo surface, the instrument accurately determines the ullage measurement.

This value is later converted into cargo volume using the vessel's approved calibration tables.

Step 4 – Temperature Measurement

The integrated temperature sensor records the cargo temperature.

Accurate temperature readings are essential because petroleum products change volume with temperature, directly affecting cargo quantity calculations.

Step 5 – Oil/Water Interface Detection

If free water measurement is required, the probe continues downward until it identifies the boundary between oil and water.

This function is particularly important for:

• Water bottom determination

• Cargo quality verification

• Tank inspection

• Cargo transfer preparation

The D-2401-2 is designed specifically for these three functions, often referred to as a Tri-Mode Gauging Unit.

Key Features of the MMC D-2401-2 Closed Type UTI Meter

True Gas-Tight Closed Operation

The instrument is engineered for closed (gas-tight) gauging applications, helping reduce vapor emissions and improve crew safety during cargo measurements.

Triple Function Measurement

One portable instrument performs:

• Ullage Measurement

• Temperature Measurement

• Oil/Water Interface Detection

This reduces equipment handling and improves inspection efficiency.

Intrinsically Safe Design

The D-2401-2 is approved as an intrinsically safe instrument for use in hazardous marine environments, making it suitable for operations where flammable vapours may be present.

Precision Measuring Tape

The anti-static precision tape is designed for reliable measurements while withstanding the demanding conditions found aboard tankers.

Rugged Marine Construction

Marine environments expose equipment to:

• Saltwater

• Humidity

• Temperature changes

• Mechanical vibration

• Heavy operational use

The D-2401-2 is built to withstand these conditions while maintaining dependable performance.

Portable and Operator Friendly

Its portable design allows operators to move easily between cargo tanks during loading, discharge, and inspection activities.

Typical Applications

The MMC D-2401-2 Closed Type UTI Meter is commonly used in:

Crude Oil Tankers

Cargo quantity verification during loading and discharge.

Product Tankers

Routine ullage, temperature, and interface measurements.

Chemical Tankers

Closed cargo inspection where compatible with the cargo and vessel procedures.

Offshore Production Facilities

Tank measurement during storage and transfer operations.

FPSOs and FSOs

Inventory verification and cargo monitoring.

Oil Storage Terminals

Portable gauging of storage tanks.

Refineries

Verification of stored petroleum products.

Marine Survey Companies

Independent cargo inspection and quantity verification.

Who Uses the MMC D-2401-2?

The instrument is widely used by:

• Ship Owners

• Ship Management Companies

• Chief Officers

• Cargo Officers

• Marine Surveyors

• Cargo Inspectors

• Oil Terminal Operators

• Offshore Operators

• Tank Farm Personnel

• Marine Service Engineers

Technical Specifications

The MMC D-2401-2 Closed Type UTI Meter is engineered to provide accurate and repeatable cargo measurements in hazardous marine environments. Its gas-tight construction, intrinsically safe design, and precision electronic sensing technology make it suitable for oil tankers, chemical carriers, offshore installations, and petroleum storage facilities.

Note: Specifications may vary depending on tape length, probe configuration, and customer requirements. Always confirm the exact model before ordering.

Main Components of the MMC D-2401-2

Understanding each component helps operators perform inspections efficiently and simplifies maintenance.

Digital Display Unit

The display unit shows:

• Ullage

• Temperature

• Interface Detection Status

• Battery Status

• Measurement Information

The LCD is designed for clear visibility under various lighting conditions encountered during cargo operations.

Electronic Measuring Probe

The electronic probe is the heart of the instrument.

It performs three essential functions:

• Detecting cargo surface

• Measuring product temperature

• Detecting oil-water interface

The probe is designed for repeated use in petroleum cargoes while maintaining reliable accuracy.

Precision Measuring Tape

The anti-static stainless-steel tape provides accurate depth measurements while resisting corrosion caused by marine environments.

Proper care of the tape directly affects measurement reliability.

Tape Reel Assembly

The reel allows smooth lowering and retrieval of the measuring tape.

Its enclosed construction helps protect the tape from contamination during transport and storage.

Battery Compartment

The portable instrument is powered by approved batteries that can be replaced quickly during routine maintenance.

Battery condition should always be checked before cargo measurement begins.

Standard Measurement Procedure

Correct operating procedures ensure accurate and repeatable cargo measurements.

Step 1 – Equipment Inspection

Before use, inspect:

• Probe condition

• Measuring tape

• Display

• Battery

• Connector

• Vapor valve adaptor

Never operate damaged equipment.

Step 2 – Connect to Vapor Control Valve

Secure the MMC D-2401-2 to the approved closed gauging valve.

Correct installation maintains gas-tight integrity throughout the measurement process.

Step 3 – Lower the Probe

The measuring probe is lowered steadily into the cargo tank.

Smooth movement helps obtain stable measurements.

Step 4 – Record Ullage

Once the probe reaches the cargo surface, the instrument records the ullage.

This value is used together with tank calibration tables to determine cargo quantity.

Step 5 – Measure Cargo Temperature

Allow sufficient time for the sensor to stabilize before recording the temperature.

Accurate temperature measurement improves cargo quantity calculations because petroleum products change volume with temperature.

Step 6 – Measure Oil-Water Interface

If required, continue lowering the probe until the interface between oil and water is detected.

This measurement is commonly performed:

• Before loading

• Before discharge

• During cargo surveys

• During tank inspections

Step 7 – Record Inspection Results

Typical reports include:

• Tank Number

• Ullage

• Temperature

• Water Bottom

• Cargo Type

• Date

• Time

• Operator Name

Proper documentation supports inventory management and commercial cargo verification.

Advantages of the MMC D-2401-2

Gas-Tight Cargo Measurement

The closed design minimizes vapor release while maintaining cargo integrity.

Three Measurements Using One Instrument

Instead of multiple portable devices, operators obtain:

• Ullage

• Temperature

• Interface

during one inspection.

Reliable Marine Construction

The D-2401-2 is built for continuous operation aboard commercial vessels exposed to:

• Salt spray

• High humidity

• Mechanical vibration

• Temperature variation

Intrinsically Safe Operation

The instrument is designed for hazardous marine environments where flammable vapors may be present.

Worldwide Industry Acceptance

MMC portable gauging equipment has been trusted by tanker operators, marine surveyors, and oil terminals for decades.

Common Operational Problems

Although the D-2401-2 is highly reliable, improper maintenance or mechanical damage may affect performance.

Problem: Incorrect Ullage Reading

Possible Causes

• Damaged tape

• Dirty probe

• Incorrect reference point

• Tape twisting

Recommended Solution

Inspect the measuring tape, clean the probe, verify the reference point, and repeat the measurement.

Problem: Temperature Reading Appears Incorrect

Possible Causes

• Sensor contamination

• Damaged temperature sensor

• Insufficient stabilization time

Recommended Solution

Allow additional stabilization time and clean the probe after each operation.

Problem: Interface Detection Failure

Possible Causes

• Heavy cargo emulsion

• Contaminated sensing tip

• Very thin water layer

Recommended Solution

Clean the sensing probe and repeat the measurement slowly.

Problem: LCD Display Does Not Power On

Possible Causes

• Battery depleted

• Loose battery connection

• Moisture ingress

Recommended Solution

Replace the battery and inspect battery contacts for corrosion.

Problem: Measuring Tape Does Not Retract Smoothly

Possible Causes

• Salt deposits

• Mechanical wear

• Damaged reel

Recommended Solution

Clean the tape after every operation and inspect the reel mechanism.

Preventive Maintenance

Routine maintenance improves measurement reliability and extends service life.

Before Every Operation

• Inspect probe

• Check battery

• Examine measuring tape

• Verify display operation

Weekly

• Clean measuring tape

• Inspect connectors

• Check reel operation

• Clean probe

Monthly

• Functional testing

• Interface detection verification

• Tape inspection

• Battery inspection

Annual Maintenance

A complete annual service should include:

• Electronic inspection

• Tape verification

• Sensor testing

• Mechanical inspection

• Battery replacement (if required)

• Functional testing

• Accuracy verification

Calibration

To maintain measurement accuracy, calibration verification should be carried out:

• During scheduled maintenance

• After major repairs

• Following mechanical impact

• Before critical cargo inspections

• According to the vessel's Planned Maintenance System (PMS)

Maintaining calibration records supports quality assurance and operational confidence.

Genuine Spare Parts Available

Ship Care Service supplies genuine replacement parts for the MMC D-2401-2 Closed Type UTI Meter, including:

• Electronic Measuring Probe

• Precision Measuring Tape

• Temperature Sensor

• Tape Reel Assembly

• Display Components

• Battery Cover

• Battery Holder

• Cable Assemblies

• Connectors

• Protective Carrying Case

• Calibration Accessories

• Mechanical Fasteners

• O-Ring Seal Kits

• Replacement Labels

Using genuine components helps preserve measurement accuracy and long-term reliability.

Buying Guide

When selecting an MMC D-2401-2 Closed Type UTI Meter, consider:

Vessel Type

Different vessels may require different tape lengths or valve adaptors.

Tank Depth

Select the measuring tape length suitable for the deepest cargo tank onboard.

Cargo Type

Confirm compatibility with the petroleum products or chemicals carried by the vessel.

Spare Parts Availability

Choose a supplier capable of providing long-term technical support and genuine replacement components.

Calibration Support

Ensure calibration and maintenance services are available throughout the instrument's operating life.

Genuine vs Counterfeit MMC Instruments

To ensure safe and reliable operation, verify:

• Manufacturer identification plate

• Correct model number

• Serial number

• Original documentation

• Product condition

• Supplier reputation

• Service history (for pre-owned units)

Avoid instruments with missing labels or undocumented repair histories.

Why Marine Professionals Choose the MMC D-2401-2

The MMC D-2401-2 remains one of the industry's preferred portable gauging instruments because it combines:

• Gas-tight operation

• Reliable measurement accuracy

• Durable marine construction

• Simple operation

• Proven long service life

• Intrinsically safe design

• Worldwide industry acceptance

• Availability of genuine spare parts and accessories

These qualities make it a trusted solution for cargo measurement on commercial tankers, offshore facilities, and petroleum storage terminals.