S-G-03–Specifications for the approval of type of gas metering devices–Part 20

Category: Gas
Issue date:
Effective date:
Revision number: 3
Supersedes: S-G-03 (rev. 2)

Part 20: Density and calorific value determining devices

Table of contents

1.0 Scope

This part of the Specifications applies to devices, other than gas chromatographs, that determine gas properties (e.g. calorific value, relative density, density) by some means.

2.0 Unit requirements

Note: The requirements of Part 1, section 1.0 apply.

3.0 Metrological requirements

Note: The following requirements of Part 1, section 2.0 apply:

  • 2.1 Rated operating conditions
  • 2.3 Maximum permissible errors
  • 2.6 Working pressure
  • 2.7 Temperature
  • 2.9 Vibrations and shocks
  • 2.10 Orientation
  • 2.14 Different gases
  • 2.16 Supply voltage variation

According to the characteristics of the device, the following requirements may also apply:

  • 2.2 Flow rate characteristics
  • 2.4 Weighted mean error
  • 2.11 Flow direction
  • 2.12 Flow disturbance
  • 2.15 Influences from ancillary devices

3.1 Maximum permissible errors

3.1.1 Calorific value

The error must not exceed a maximum permissible error (MPE) of ± 0.5%.

3.1.2 Density and/or relative density

The error must not exceed a MPE of ± 0.7%.

3.2 Repeatability

The repeatability error of the device must be smaller than or equal to one fifth of the MPE that would be applicable to the mean value of the measurement results.

4.0 Technical requirements

Note: The following requirements of Part 1, section 3.0 apply:

  • 3.1 Design, composition and construction
  • 3.2 Minimum temperature range
  • 3.4 Case
  • 3.7 Indication
  • 3.9 Power source
  • 3.10 Software
  • 3.11 Compressibility factor
  • 3.12 Registration

4.1 Calorific value

Devices must have a range of calorific value suitable for the intended purpose.

4.2 Relative density

Devices must have a range of relative density suitable for the intended purpose.

5.0 Marking requirements

Note: The following requirements of Part 1, section 4.0 apply:

  • 4.1 Permanency and legibility
  • 4.2
    • (a) Departmental approval number
    • (b) Manufacturer's name or registered trademark
    • (c) Model or type designation
    • (d) Serial number
    • (e) Ambient temperature range, where less than -30 °C to 40 °C
  • 4.9 External power supply
  • 4.10 Software
  • 4.11 Connection terminals
  • 4.12 Inspection number
  • 4.13 Verification marks
  • 4.14 Operating information

According to the characteristics of the device, the following requirements may also apply:

  • 4.2
    • (f) Pmin (where applicable) and Pmax
    • (g) Qmax
    • (h) Qmin
    • (k) Type and range for analogue input and/or output signal
    • (l) Protocol/interface for digital input and/or output
  • 4.3 Bar codes or quick response codes

5.1 Additional information

The following information must be marked on the nameplate, where applicable:

  • Type of gas if other than natural gas;
  • Range of density and/or relative density;
  • Range of calorific value;
  • Ranges of gas and air flow rates;
  • Ranges of inlet gas and air pressure and temperature; and
  • Any range of influence quantity that may affect the performance of the device.

6.0 Sealing provision requirements

Note: The following requirements of Part 1, section 5.0 apply:

  • 5.1 General
  • 5.2 Electronic gas metering devices
  • 5.3 Modular design

7.0 Administrative requirements

Note: The requirements of Part 1, section 6.0 apply.

8.0 Performance test requirements

Note: Test conditions and performance tests can be obtained by contacting MC.

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