ISO 22760-4:2024

Road vehicles - Dimethyl Ether (DME) fuel system components - Part 4: Level indicator

This document specifies definitions of and general requirements to level indicators, intended for use on the types of motor vehicles defined in ISO 3833. It also provides general design principles, and specifies requirements for instructions and marking. This document is applicable to vehicles using gaseous fuels in accordance with ISO 16861. It is not applicable to the following: a) fuel containers, except to the extent explicitly referred to in this document; b) stationary, ship, railroad vehicle or aircraft dimethyl ether (DME) engine installations; c) electronic fuel management; d) refuelling receptacles. NOTE 1 It is recognized that miscellaneous component properties not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 22760 series, including subjecting the component to the appropriate functional tests. NOTE 2 All pressures referred to in this document are gauge pressures unless otherwise specified.

Véhicules routiers — Composants des systèmes de combustible Diméthyle Ether (DME) — Partie 4: Indicateur de niveau

General Information

• Status: Published
• Publication Date: 16-May-2024
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 8 - Fuel system components and refueling connector for vehicles propelled by Dimethyl Ether (DME)
• Current Stage: 6060 - International Standard published
• Start Date: 17-May-2024
• Due Date: 27-Jan-2024
• Completion Date: 17-May-2024

Relations

• Consolidated By: ISO 21181:2025 - Light conveyor belts - Determination of the relaxed elastic modulus
• Effective Date: 02-Dec-2023
• Amended By: ISO 22760-4:2024/Amd 1 - Road vehicles — Dimethyl Ether (DME) fuel system components — Part 4: Level indicator — Amendment 1
• Effective Date: 31-May-2025

Overview

ISO 22760-4:2024 specifies requirements for level indicators used in dimethyl ether (DME) fuel systems for road vehicles (as defined in ISO 3833). It defines terminology, marking, general design principles and mandatory tests to ensure safe, reliable measurement of DME fuel level in vehicle applications. The document applies to vehicles using gaseous fuels in accordance with ISO 16861 and excludes most fuel containers, non-road/ship/rail/aircraft installations, electronic fuel management and refuelling receptacles. (All pressures are gauge unless stated.)

Key topics and technical requirements

• Marking: Components must be traceable with manufacturer name/trademark, model/part number and working pressure (or pressure/temperature range). Recommended entries include flow direction, fuel type, electrical rating, certification symbol/approval number and serial/date code.
• Design & assembly: Level indicators must comply with ISO 22760-1 and ISO 22760-2. Electrical connections are to meet IP54 (IEC 60529). Accuracy must be sufficient to support the correct operation of the system 85% stop valve (see ISO 22760-3).
• Mandatory tests: A defined test suite (see Table 1) includes:
  • Hydrostatic strength: test at 2.25 × working pressure.
  • Leakage: tests at specified temperatures and pressure factors (e.g., −40/−20 °C, 20 °C, 85 °C with pressures scaled to working pressure).
  • Continued operation: system-level endurance including assembly testing, tank filling to 85% stop valve actuation, then cycling the indicator 4,000,000 times around the critical level (±10% at >2 Hz) and additional 6,000 full-range cycles; subsequent hydrostatic re-test required.
  • Insulation resistance: 1 000 V DC between connector pins and housing for ≥2 s; resistance > 240 kΩ.
  • Float pressure test: floats (if present) must withstand 4 500 kPa for 1 min with no visible deformation or cracking.
• Applicability notes: Some tests apply only to electrically connected indicators or those exposed to environmental conditions.

Applications and users

ISO 22760-4:2024 is intended for:

• OEMs and vehicle system integrators designing DME-powered road vehicles
• Component manufacturers and suppliers of DME level indicators / fuel level sensors
• Test laboratories and certification bodies performing compliance and type-approval testing
• Regulatory agencies and technical spec writers for gaseous-fuel vehicle safety

Benefits include consistent safety margins, traceability, interoperability within the ISO 22760 series, and clear test protocols that reduce risk of overfilling and system failure.

Related standards

• ISO 22760-1 (general requirements)
• ISO 22760-2 (performance and test methods)
• ISO 22760-3 (85% stop valve)
• ISO 22760-6, ISO 22760-9 (pressure relief components)
• ISO 16861 (DME fuel specification)
• ISO 3833 (vehicle types) and IEC 60529 (IP code)

Keywords: ISO 22760-4:2024, DME fuel system, dimethyl ether, level indicator, road vehicles, fuel level sensor, hydrostatic strength, insulation resistance, IP54.

Standards Content (Sample)

International
Standard
ISO 22760-4
First edition
Road vehicles — Dimethyl ether
2024-05
(DME) fuel system components —
Part 4:
Level indicator
Véhicules routiers — Composants des systèmes de combustible
Diméthyle Ether (DME) —
Partie 4: Indicateur de niveau
Reference number
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . . 2
5 Design and assembly . 2
6 Tests . 2
6.1 Applicability .2
6.2 Hydrostatic strength .3
6.3 Leakage .3
6.4 Continued operation .3
6.5 Insulation resistance.4
6.6 Float pressure test .4
Bibliography . 5

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific
aspects for gaseous fuels.
A list of all parts in the ISO 22760 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
International Standard ISO 22760-4:2024(en)
Road vehicles — Dimethyl ether (DME) fuel system
components —
Part 4:
Level indicator
1 Scope
This document specifies definitions of and general requirements to level indicators, intended for use on
the types of motor vehicles defined in ISO 3833. It also provides general design principles, and specifies
requirements for instructions and marking.
This document is applicable to vehicles using gaseous fuels in accordance with ISO 16861. It is not applicable
to the following:
a) fuel containers, except to the extent explicitly referred to in this document;
b) stationary, ship, railroad vehicle or aircraft dimethyl ether (DME) engine installations;
c) electronic fuel management;
d) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous component properties not specifically addressed herein can be
examined for compliance with the criteria of any applicable part of the ISO 22760 series, including subjecting the
component to the appropriate functional tests.
NOTE 2 All pressures referred to in this document are gauge pressures unless otherwise specified.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 22
...