1. Measurement Canada Seal Period Reduction of Ultrasonic Meters
IMG Presentation by Mark Flynn

2. Measurement Canada New Seal Periods G-18 https://www. ic. gc
Ultrasonic meter
Initial seal period
Qualifying under section years
All others 6 years
Subsequent reverification period Dec 31, 2013
Qualifying under section years
All others 5 years
Subsequent reverification period January
Qualifying under section years
All others 4 years
Note manufacturer may write within approval for the new seal period.

3. G-18 - Reverification periods for gas meters, ancillary devices and metering installations
5.4 Lengthening of initial reverification periods
5.4.1 Conditionally lengthened initial reverification periods
A reverification period for a particular meter, class, type or design is to be considered as conditionally lengthened when:
the requirements of the documents referenced in 3.0(c) and (d) have been met and the specific meter type, class, make, model, configuration, rating or capacity has been identified and formally communicated by Measurement Canada in the document referenced in 3.0(f) as one to which a lengthened initial reverification period may be applicable; and
national meter performance results from preceding reverification inspections, including interim inspections performed under designed experiments, do not exist, are not available in required quantities or do not reflect the required in-service duration periods needed to support the granting of an unconditionally lengthened initial reverification period.
Conditionally lengthened initial verification periods may be limited in their application (e.g. meters which are initially verified after a certain date). Meters to which a conditionally lengthened initial reverification period applies will typically be subjected to further in-service testing and performance criteria as an interim measure prior to the expiry of the initial reverification period.
5.4.2 Unconditionally lengthened initial reverification periods
A lengthened reverification period will be considered unconditional and retroactive to all approved meters covered by an approval applicant's attestation, regardless of a meter's verification date or other criteria, where:
the lengthened initial reverification period is stated in the meter's Notice of Approval; or
the performance results at preceding reverification inspections, including interim inspections performed under designed experiments provide evidence that the lengthened reverification period has not adversely affected confidence in the accuracy of the meters as concerns their continued compliance with the requirements of the Electricity and Gas Inspection Act.
Where the evidence submitted in accordance with item (b) is deemed to meet the applicable specification requirements, the lengthened initial reverification period's unconditional application will be formally communicated by Measurement Canada in the document referenced in 3.0(f).

4. Ultra sonic meters now approved by MC for unconditionally Lengthened initial reverification period.
Sensus Metering SystemsSonix 25 (880)AG-0514Ultrasonic Meter 25 m3/h 880 ft3/h All meters granted or still within an initial reverification period as of January 1st, 2010.

5. Industry Measurement Group
Technology or Device Study is Proposed
To Review
-Technologies and accuracies of devices
-To create a white paper about study findings
-To report on findings to the IMG group
-To post findings and presentation on the IMG website members only area
-To present the findings to MC

6. White Paper & Presentation at IMG meeting
Outcome of study

7. Multiple Industry Ultrasonic Transducers Investigation
The Focus of Study / Paper:
-Transducer Premature Failures
-Nonlinear Response of Transducers during Reverification
-Piping Vibration Impacts on Transducer Life Span
-Over Saturation of Transducers (effects of auto gain circuity designs to overcome dirty transducers)
-Wetted Transducer Seal Failure