ISO 12614-15:2021 Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 15: Capacitance fuel content gauge

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Road vehicles — Liquefied natural gas (LNG) fuel system components —Part 15: Capacitance fuel content gauge是国际标准化组织于2021‑06‑04发布的ISO标准，适用于世界范围。

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INTERNATIONAL STANDARD ISO 12614-15:2021

Road vehicles — Liquefied natural gas (LNG) fuel system components —

Part 15: Capacitance fuel content gauge

1 Scope

This document specifies tests and requirements for the capacitance fuel content gauge, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833.

This document is applicable to vehicles using natural gas in accordance with ISO 15403‑ 1 (mono‑ fuel, bi‑ fuel, or dual‑ fuel applications). It is not applicable to the following:

a) fuel containers;

b) stationary gas engines;

c) container mounting hardware;

d) electronic fuel management;

e) refuelling receptacles.

It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests.

All references to pressure in this document are to be considered gauge pressures unless otherwise specified.

1)

This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar ]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.

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 126141‑ , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General requirements and definitions

ISO 12614‑2 , Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 2: Performance and general test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given ISO 12614-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

2

1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1N/mm .

ISO 12614-15:2021

— IEC Electropedia: available at http://www.electropedia.org/

4 Marking

Marking of the component shall provide sufficient information to allow the following to be traced.

a) the manufacturer’s or agent’s name, trademark, or symbol;

b) the model designation (part number);

c) temperature range.

The following additional markings are recommended.

i) the direction of flow (when necessary for correct installation);

ii) the type of fuel;

iii) electrical ratings (if applicable);

iv) the symbol of the certification agency;

v) the type approval number;

vi) the serial number or date code;

vii) reference to this document (i.e. ISO 126141‑ 5).

NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of more than one part.

5 Construction and assembly

5.1 The capacitance fuel content gauge consists of:

— capacitance transmitter (placed next to the fuel tank),

— fuel content indicator (placed on the dash‑ board),

NOTE The fuel content indicator is an automotive type gauge, calibrated to the transmitter, and therefore not subject of tests specified in this document. It is presumed that the indicator is certified according to the general automotive industry requirements.

— capacity transmission cables, and

— signal transmission cable.

5.2 The function of the fuel content gauge is to measure the electrical capacitance between the fuel tank outer vessel and the cable from the inner vessel capacity level sensor. The function of the gauge is also to transmit the measured capacitance to an electric signal to be sent to the fuel content indicator, e.g. 4 mA to 20 mA.

5.3 The output of the capacitance fuel content gauge shall be joined with fuel content indicator on the dashboard. The gauge shall provide the signal compatible with the requirements of the fuel content indicator.

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