S-G-03–Specifications for the approval of type of gas meters, ancillary devices and associated measuring instruments

Category: Gas
Issue date:
Effective date:
Revision number: 1
Supersedes: LMB-EG-08 and S-G-03


Part 6: Coriolis mass flow meters

Table of contents


1.0 Scope

This part of the Specifications applies to meters which are submitted for approval and measure the mass flow rate of a flowing gas.

2.0 Definitions

Coriolis mass flow meter (débitmètre massique à effet de Coriolis)

A meter is comprised of one or more oscillating tubes and electromagnetic components. All meter components are installed together in a metering assembly and measure the mass flow rate of the gas travelling through the system.

3.0 Units

The applicable requirements of Part 1, section 6.0 shall apply unless otherwise stated in this section.

3.1 The unit of measurement shall be the kilogram.

4.0 Metrological requirements

The applicable requirements of Part 1, section 7.0 shall apply unless otherwise stated in this section.

4.1 Maximum permissible errors

The following MPEs shall apply to the true mass registration at any flow rate within the flow rate range for which approval is sought (see Part 6, Table 1).

Part 6, Table 1: Coriolis mass flow meter maximum permissible errors
Test conditions Flow rate (Q) MPE
Reference or "other than reference" QminQQt ± 1.5%
Qt < QQmax ± 1%

4.2 Repeatability

The repeatability of error shall be as specified in Part 6, Table 2.

Part 6, Table 2: Coriolis mass flow meter repeatability
Flow rate (Q) Repeatability
QminQQt ± 1% of reading
Qt < QQmax ± 0.35% of reading

4.3 Maximum peak-to-peak error

The maximum peak-to-peak error shall be as specified in Part 6, Table 3.

Part 6, Table 3: Coriolis mass flow meter maximum peak-to-peak error
Flow rate (Q) Maximum peak-to-peak error
QminQQt 1.5% of reading
Qt < QQmax 1% of reading

5.0 Marking requirements

In addition to the applicable requirements of Part 1, section 9.0, the following shall apply.

5.1 The maximum mass flow rate shall be marked on the nameplate.

6.0 Performance tests

The applicable requirements of Part 1, section 12.0 shall apply unless otherwise stated in this section.

6.1 Operating conditions

6.1.1 Variation of mass flow rate

The meter shall be tested at various pressures over its rated operating pressure range.

6.2 Test medium

The meter shall be tested using dry compressed air, properly filtered to remove foreign matter.

6.3 Evaluation tests

Subject to 6.1, tests shall be performed at flow rates distributed over the measuring nominal mass flow rate range with a test medium as specified in 6.2 at reference and "other than reference" conditions (see Part 6, Table 4).

Part 6, Table 4: Coriolis mass flow meter registration tests
Mass flow rate (Q) Test medium Operating conditions Environmental conditions
QminQQmax Dry compressed air Reference Reference
"Other than reference" "Other than reference"

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