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Title / Test gas meters using a bell prover
Level / 3 / Credits / 12
Purpose / People credited with this unit standard are able to: locate and identify procedures, documentation, and equipment for testing a gas meter using a bell prover; prepare to and test gas meters using a bell prover; and complete reporting and documentation for testing gas meters.
Classification / Gas Industry > Gas Measurement
Available grade / Achieved
Guidance Information
1This unit standard is intended for, but is not limited to, workplace assessment. The range statements relate to enterprise specific equipment, procedures, and processes.
2The current version of the following documents must be complied with:
Health and Safety at Work Act 2015;
Standards and Accreditation Act 2015;
NZS 5259:2015Gas measurement.
3Any new, amended or replacement Acts, regulations, standards, codes of practice, guidelines, or authority requirements or conditions affecting this unit standard will take precedence for assessment purposes, pending review of this unit standard.
4All work practices must comply with the quality requirements of the International Standards Organisation.
5References
International Standards Organisation (ISO) standards may be found at
New Zealand standards (NZS) may be found at
6Definitions
Company procedures means the documented methods for performing work activities and include health and safety, environmental, and quality management requirements. They may refer to manuals, codes of practice, or policy statements.
IANZ refers to International Accreditation New Zealand.
Outcomes and performance criteria
Outcome 1
Locate and identify procedures, documentation, and equipment for testing a gas meter using a bell prover.
Performance criteria
1.1Company procedures for testing a gas meter using a bell prover are located and interpreted in relation to specified job requirements.
RangeNZS 5259, Test Method Manual, IANZ requirements.
1.2Potential environmental and safety hazards are identified in accordance with company procedures.
1.3Test equipment, components, and materials are identified and described in terms of type and function.
Rangeequipment may include but is not limited to – bell prover, meter, labels, external leak test, rating caps, test certificates, internal leak test, tools, fittings, seals;
function may include but is not limited to – pressure, capacity, flow, leakage, conversion.
1.4Equipment is described in terms of potential hazards of incorrect application and operation, and the steps to avoid them are described in accordance with company procedures.
1.5Resource requirements are identified and sourced in accordance with company procedures.
Rangetools, materials, documentation, personnel.
Outcome 2
Prepare to and test gas meters using a bell prover.
Performance criteria
2.1Gas meter details are checked prior to test.
Rangesoundness, conditioning, badge plate, seals, dials, make and model, serial number, index reading, metric or imperial, year of manufacture.
2.2Bell prover is checked prior to test.
Rangeposition of bell, leaks, bell temperature, room temperature, zero, calibration labels, rating caps, valves.
2.3Tests are performed in accordance with manufacturer’s instructions and company procedures.
Rangelabelling, external leakage, accuracy of registration, internal leakage, sealing.
2.4Test equipment is used in accordance with company procedures and manufacturer’s instructions.
Outcome 3
Complete reporting and documentation for testing gas meters.
Performance criteria
3.1Test results are recorded in accordance with company procedures.
Rangereport number, capacity, flow rate, leakage, accuracy, date, person conducting test, person certifying test.
3.2Information is communicated to other parties, both internal and external, in accordance with company requirements.
Rangetest certificates, currency certification, recommendations, identification tags, labels, customers, clients.
Planned review date / 31 December 2019Status information and last date for assessment for superseded versions
Process / Version / Date / Last Date for AssessmentRegistration / 1 / 22 October 2002 / N/A
Review / 2 / 20 November 2006 / N/A
Revision and Rollover / 3 / 17 August 2017 / N/A
Consent and Moderation Requirements (CMR) reference / 0014
This CMR can be accessed at
Comments on this unit standard
Please contact MITO New Zealand Incorporated you wish to suggest changes to the content of this unit standard.
MITO New Zealand IncorporatedSSB Code 101542 / New Zealand Qualifications Authority 2018