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Overview
On a tanker, every cargo measurement matters. The figures recorded during ullage gauging, oil/water interface detection, and cargo temperature measurement flow directly into custody transfer documentation, cargo quantity calculations, and regulatory compliance records. When a portable gauging instrument produces inconsistent readings — a tape that stretches and loses calibration, an interface probe that misses low-level water accumulations, or a temperature sensor that drifts beyond its rated accuracy — those measurement errors create commercial disputes, custody transfer discrepancies, and compliance exposure that vessel operators and terminal inspectors have no tolerance for.
The MMC UTI Meter (Model D2401-2) is a triple-function portable gauging unit designed for simultaneous ullage, oil/water interface, and temperature measurement on marine tankers and shore-based storage tank installations. Part number 2401TR30MCBSC50, the D2401-2 is a Restricted Type (“R” type) instrument built for use through MMC vapor control valves on marine tanker cargo tanks — with a 30-metre Tefzel-coated, anti-static treated gauging tape that delivers ±3mm tape accuracy and API Chapter 7-compliant temperature measurement across 0°C to 80°C.
What sets MMC UTI meters apart from other portable gauging instruments in this category is the tape material specification. Where lower-specification instruments use polyethylene-coated tapes as standard, MMC’s gauging tapes — with the exception of the low-cost polyethylene option — are Tefzel® (DuPont Corp.) coated and anti-static treated by MMC. Tefzel-coated tape offers significantly greater chemical resistance against the hydrocarbon cargoes, cargo vapours, and tank atmosphere conditions that tanker gauging tapes are continuously exposed to, maintaining tape dimensional integrity and measurement accuracy over a longer service life than standard polyethylene-coated alternatives.
Key Features
Triple Function — Ullage, Oil/Water Interface, and Temperature in One Operation
The MMC D2401-2 measures ullage level, oil/water interface, and cargo temperature simultaneously in a single probe insertion through the tank gauging point. For cargo officers and terminal gaugers who need to record all three parameters for each tank during pre-departure, arrival, or custody transfer gauging rounds, a single-instrument triple-function measurement eliminates the time and handling involved in deploying separate instruments for each parameter — reducing gauging round time and minimising the number of gauge point openings required per tank.
Tefzel®-Coated, Anti-Static Treated Gauging Tape — 30 Metres
The D2401-2 is supplied with a 30-metre Tefzel® (DuPont Corp.) coated gauging tape, anti-static treated by MMC. Tefzel is a fluoropolymer coating material with outstanding chemical resistance to hydrocarbons, aromatic compounds, and the corrosive vapour environments found in cargo tank headspaces — environments that degrade standard polyethylene-coated tapes much more rapidly. The anti-static treatment addresses the electrostatic hazard that is inherent to tape movement in hydrocarbon cargo tank atmospheres, a critical safety feature for intrinsically safe gauging operations in flammable cargo environments. The result is a tape that holds its dimensional calibration longer, resists chemical attack more effectively, and meets the safety requirements for use in hazardous cargo tank atmospheres.
±3mm Tape Accuracy — ±0.1°C Temperature Accuracy
The D2401-2 delivers tape accuracy of ±1/8 inch (±3mm) or ±0.01% of full-scale tape length, whichever is applicable — and temperature measurement accuracy of ±0.2°F (±0.1°C) per API Chapter 7 specifications across a range of 0°C to 80°C. API Chapter 7 is the industry-standard specification for temperature measurement in petroleum measurement operations — compliance with this standard confirms the temperature sensor meets the measurement accuracy requirement for custody transfer documentation and cargo temperature records. For independent gaugers and cargo officers producing figures that will be used in commercial cargo quantity calculations, API-referenced accuracy is the appropriate instrument standard.
Restricted Type (“R” Type) — Compatible with MMC Vapor Control Valves
The D2401-2 is a Restricted Type (“R” type) UTI meter designed for use with MMC vapor control valves on marine tanker cargo tanks. Restricted type gauging is the standard vapour-controlled gauging method for tankers carrying volatile or flammable liquid cargoes — the instrument interfaces with the tank’s vapor control valve fitting to allow the gauging probe to enter the tank while maintaining vapour containment. For tanker operators and cargo officers using MMC vapor control valve systems, the D2401-2 provides direct compatibility without requiring additional adapters or valve modification.
Detects All Floating and Non-Conductive Hydrocarbons
The MMC UI gauging probe is capable of detecting all floating and non-conductive hydrocarbons — covering the full range of petroleum product and chemical cargo types carried on product tankers, crude tankers, and chemical tankers. For vessels carrying varied cargo types across trading routes, an interface probe with broad hydrocarbon detection capability eliminates the need to carry different interface detection instruments for different cargo types, simplifying shipboard portable gauging equipment management.
Available in Multiple Gauging Types — R, C, O, and E
MMC UTI meters are available in four gauging type configurations to match the physical gauging access arrangement of the installation: Restricted (“R” type) for marine tankers via MMC vapor control valves; Closed (“C” type) for marine tankers and storage tanks via tank-top gauging stations; Open (“O” type) for installations with non-toxic product vapours only; and Environmental (“E” type) for well monitoring applications with typical well vapours only. The D2401-2 (part 2401TR30MCBSC50) is the Restricted type variant — selecting the correct gauging type for the installation is essential for safe and compliant gauging operation.
Intrinsically Safe Certification
MMC UTI meters are certified as Intrinsically Safe for use in the hazardous areas present on tanker cargo decks and in cargo tank environments where flammable or explosive vapour atmospheres may exist. Intrinsic safety certification is the fundamental safety requirement for any portable instrument used in tanker cargo gauging operations — without it, the instrument cannot be legitimately used in these environments under international maritime safety standards and flag state requirements. The certification provides class surveyors, port state control officers, and HSE inspectors with confirmation that the instrument meets the hazardous area equipment requirements for the operating environment.
Technical Specifications
Description: MMC 30m-UTI D2401-2, Triple Function Gauging Unit Restricted
Brand: MMC
Model: D2401-2
Part Number: 2401TR30MCBSC50
Gauging Type: Restricted (“R” type) — via MMC vapor control valves
Tape Length: 30 metres
Tape Material: Tefzel® (DuPont Corp.) coated, anti-static treated by MMC
Tape Accuracy: ±1/8″ (±3mm), ±0.01% of full-scale tape length
Temperature Accuracy: ±0.2°F (±0.1°C) per API Chapter 7 specifications
Temperature Measurement Range: 32°F to 176°F (0°C to 80°C)
Functions: Ullage, Oil/Water Interface Detection, Temperature
Interface Detection: All floating and non-conductive hydrocarbons
Safety Certification: Intrinsically Safe
Available Gauging Types: R (Restricted), C (Closed), O (Open), E (Environmental)
Benefits
Reduces cargo gauging round time on multi-tank tanker operations. With ullage, interface, and temperature measurement consolidated into a single instrument and a single probe insertion per tank, the D2401-2 eliminates the separate instrument deployments that extend gauging round time. For cargo officers completing pre-departure gauging across eight or more cargo tanks under departure schedule pressure, the time saving per tank compounds into a meaningful reduction in total gauging round duration.
API Chapter 7-compliant temperature measurement supports custody transfer documentation. Temperature measurement accuracy to API Chapter 7 specification confirms the D2401-2 meets the industry standard for petroleum measurement temperature accuracy — producing temperature figures that meet the evidentiary standard for custody transfer records, bill of lading documentation, and cargo quality certificates without requiring supplementary temperature verification instruments.
Tefzel tape longevity reduces instrument replacement and recalibration frequency. Tefzel-coated tape maintains its dimensional accuracy and physical integrity in hydrocarbon cargo environments significantly longer than standard polyethylene-coated tape alternatives. For vessel operators and terminal gauging teams who use their UTI instruments intensively across multiple cargo operations, longer tape service life directly reduces the frequency and cost of tape replacement and the recalibration events that tape replacement necessitates.
Intrinsic safety certification supports hazardous area equipment compliance without additional barriers. The intrinsically safe certification built into the D2401-2 means the instrument can be used directly in tanker cargo tank hazardous areas without additional safety barriers or protective equipment — simplifying hazardous area instrument management for vessel operators and terminal HSE teams responsible for maintaining compliant portable equipment inventories.
Broad hydrocarbon detection capability reduces the need for cargo-type-specific instruments. The ability to detect all floating and non-conductive hydrocarbons means the D2401-2 covers the full range of petroleum product and chemical cargo types on a single instrument — eliminating cargo-type-specific interface detection limitations that would require additional instruments for certain cargo categories on multi-trade vessels.
Who It’s For
The Chief Officer or Cargo Officer on a Product or Chemical Tanker
You’re responsible for cargo measurement and documentation on a product tanker or chemical tanker. You need a portable UTI instrument that gives you reliable ullage, interface, and temperature figures quickly across all cargo tanks — figures that will hold up when compared against the terminal gauger’s independent measurements at custody transfer. You’re working through MMC vapor control valve fittings on your cargo tank gauge points and you need an instrument confirmed compatible with that system. The D2401-2, as a Restricted type MMC UTI meter designed specifically for use with MMC vapor control valves, gives you direct system compatibility and the measurement accuracy you need for custody transfer documentation.
The Independent Cargo Surveyor or Terminal Gauging Inspector
You work as a third-party independent cargo surveyor or terminal gauging inspector, and the figures you produce become the basis of commercial transaction documentation. Your professional credibility depends on the accuracy and consistency of your measurements — and on using instruments that meet the accuracy standards your clients and the cargo buyers expect. The D2401-2’s ±3mm tape accuracy, API Chapter 7 temperature compliance, and intrinsic safety certification give you an instrument specification you can reference in your survey reports with confidence, and that your clients can accept as meeting professional gauging standards.
The HSE or Fleet Technical Manager Responsible for Portable Gauging Equipment Compliance
You’re managing the portable gauging equipment inventory across a managed fleet or terminal operation — responsible for ensuring every instrument in use carries the correct hazardous area certification, meets the accuracy requirements for the operations it’s used in, and is maintained within its calibration schedule. The D2401-2’s documented intrinsic safety certification, API Chapter 7 temperature accuracy standard, and MMC’s established position as a recognised UTI instrument manufacturer give you the equipment specification documentation you need to include the instrument in your hazardous area equipment register and fleet portable equipment maintenance programme.
Possible Applications
- Tanker cargo gauging — pre-departure and arrival ullage measurement — Ullage measurement across cargo tanks for departure figures, arrival figures, and bill of lading quantity documentation on product tankers, crude tankers, and chemical tankers.
- Oil/water interface detection for MARPOL compliance and slop management — Precise oil/water interface measurement in slop tanks and cargo tanks for MARPOL-compliant slop management, tank washing verification, and water accumulation monitoring.
- Custody transfer measurement at marine loading and discharge berths — Independent gauging for cargo quantity verification and custody transfer documentation during ship-to-shore liquid cargo transfer operations at terminals and refinery berths.
- Shore-based bulk liquid storage tank gauging via tank-top gauging stations — Restricted and closed type gauging of shore-based crude oil, fuel oil, and chemical product storage tanks at import/export terminals, blending plants, and distribution depots.
- Heated cargo temperature monitoring — HFO, palm oil, bitumen, lubricating oil — Temperature measurement in heated cargo tanks for cargo care record keeping, cargo quality documentation, and pump-ability verification across temperature-sensitive bulk liquid cargo types.
- Bunkering operations — bunker fuel quantity and temperature verification — Ullage and temperature measurement in bunker fuel tanks before and after bunkering for quantity verification, bunker delivery note documentation, and fuel oil quality records.
- Chemical tanker cargo/water interface gauging after tank washing — Detection of chemical/water interface in cargo tanks after washing operations to verify tank cleanliness and water removal before next cargo loading on chemical tankers.
- Offshore floating storage units — cargo measurement and water bottom detection — Portable gauging on offshore floating storage and production units where supplementary manual gauging capability is required alongside fixed gauging systems for cargo quantity verification and water accumulation monitoring.
Trust & Certifications
Intrinsically Safe Certification — Hazardous Area Compliance for Tanker Operations
MMC UTI meters carry Intrinsically Safe certification, confirming the instruments are designed and certified to remain safe in the flammable and explosive vapour atmospheres present in tanker cargo tanks, cargo pump rooms, and associated hazardous deck areas. Intrinsic safety is the foundational hazardous area equipment requirement for portable gauging instruments used in tanker operations under SOLAS, IEC 60079, and OCIMF portable equipment guidelines. For class surveyors, port state control officers, and vessel operators’ HSE auditors, intrinsically safe certification is the minimum acceptable standard for portable instruments in these environments.
API Chapter 7 — Temperature Measurement Standard for Petroleum Operations
The D2401-2’s temperature sensor meets API Chapter 7 (Manual of Petroleum Measurement Standards, Chapter 7: Temperature Determination) accuracy specifications. API Chapter 7 is the industry reference standard for temperature measurement in petroleum custody transfer and cargo measurement operations — compliance with this standard confirms the temperature measurement accuracy meets the evidentiary requirements for custody transfer documentation and is consistent with the measurement standards expected by oil majors, terminals, and independent inspection companies for commercial cargo operations.
Tefzel® Coating — DuPont Corp. Material Standard
The Tefzel® coating used on MMC UTI gauging tapes is a DuPont Corp. registered fluoropolymer material with a well-documented chemical resistance profile in hydrocarbon and industrial chemical environments. The use of a named DuPont material specification — rather than a generic fluoropolymer coating — provides procurement teams with a verifiable material standard for assessing tape chemical resistance and service life suitability for their cargo types and operating environments.
MMC — Recognised Manufacturer of Marine Portable Gauging Instruments
MMC is an established manufacturer of portable oil/water interface gauging instruments with a recognised presence in the marine tanker gauging market. MMC UTI meters are specified and used across the global tanker fleet and at bulk liquid terminals, with the MMC vapor control valve gauging system a familiar installation on many tanker types. For procurement teams and vessel operators sourcing portable gauging instruments, MMC’s established market position in this specific product category provides the manufacturer credibility assurance that is relevant to safety-critical measurement instrument sourcing decisions.
Supplied by Alright Engineering Solutions
The MMC UTI Meter D2401-2 is available through Alright Engineering Solutions Pte. Ltd., an authorised distributor of marine safety, portable gas detection, and cargo gauging instruments in Singapore. Alright Engineering Solutions supports tanker operators, terminal operators, independent gauging companies, and ship management organisations across the Singapore and regional market with instrument supply, technical product enquiries, and after-sales support coordination.
Accessories & Variants
Gauging Type Variants — R, C, O, E
The MMC UTI meter range is available in four gauging type configurations. The Restricted (“R” type) variant (D2401-2, part 2401TR30MCBSC50) is designed for marine tankers using MMC vapor control valves. The Closed (“C” type) variant is available for marine tankers and shore storage tanks using tank-top gauging stations. The Open (“O” type) variant is available for non-toxic product vapour applications. The Environmental (“E” type) is available for well monitoring applications. Selecting the correct gauging type for the specific tank access configuration is essential — contact Alright Engineering Solutions to confirm the correct variant for your installation.
Tape Length Variants
MMC UTI meters are available with different tape lengths to match the cargo tank or storage tank depth of the installation. The D2401-2 (part 2401TR30MCBSC50) is the 30-metre tape variant, appropriate for the majority of product and chemical tanker cargo tanks. Longer tape variants are available for deep crude oil cargo tanks and deep shore storage tanks — confirm the required tape length for your installation before ordering to ensure full tank depth gauging capability.
Low-Cost Polyethylene-Coated Tape Option
For applications where the extended chemical resistance and service life of Tefzel-coated tape is not a primary requirement — or where procurement budget constraints make the Tefzel option less appropriate — MMC offers a low-cost polyethylene-coated tape variant. The polyethylene tape provides standard tape dimensional accuracy for ullage measurement in less chemically aggressive cargo environments. Note that all other MMC UTI tapes are Tefzel-coated as standard.
Related Portable Gauging and Gas Detection Products
T2000-TFC-01 Restricted Type Portable UTI Meter — Alternative restricted type portable UTI meter with Ex ia IIB T4 intrinsic safety rating, ±2mm accuracy, and -20°C to 110°C temperature sensor range
GX-8000 Sample Draw Multi Gas Monitor — Portable marine sample draw multi-gas monitor for vessel confined space entry and cargo tank atmosphere testing
RX-8700 Portable Gas Detector — Portable multi-gas monitor with ATEX/IECEx/MED certification for marine gas detection applications
Fixed Gas Detection Systems — Fixed point gas detection solutions for engine rooms, pump rooms, and cargo areas on tankers and offshore vessels
Get in Touch
If you need the MMC UTI Meter D2401-2 (part 2401TR30MCBSC50) for tanker cargo gauging, terminal measurement, or independent survey operations — whether for immediate vessel supply, fleet procurement, or confirmation of the correct gauging type variant for your installation — contact Alright Engineering Solutions to check availability and request a formal quotation.
Our team can advise on gauging type selection, tape length requirements, and compatibility with your tank gauging system configuration.
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