![]() These situations highlight the need for an ATC policy in the petroleum industry to ensure that the conversion to a temperature compensated measuring system will be equitable to all parties in a trade transaction. Additionally, some traders have indicated their intention to turn the ATC function off during the warmer months and on again in the colder months. For example, only the higher volume products such as the regular no lead meters are initially converted to ATC, leaving the mid grade and premium products to a later date. Although most traders have converted all devices at the same time, some traders, such as those operating retail fuel stations and vehicle mounted measuring systems, are choosing to phase-in the cost of ATC conversion over a number of years. The Weights and Measures Act or Regulations do not address the issue of partial conversions, only requiring that when a device is temperature corrected, that it be appropriately marked. Many traders have chosen to convert all meters at their establishment to ATC at the same time, while some have chosen to convert only selected meters or product lines. This measurement practice is commonly referred to as automatic temperature compensation (ATC) and uses the internationally accepted reference temperature of 15 ☌ for volume correction. In the past few years, the petroleum industry has been converting their measuring equipment to account for the temperature of the product as it is being metered. This policy does not apply to the metering of liquids, such as propane, that have a vapour pressure of greater than 101.325 kPa at metering conditions. Meter applications include fuel dispensers, high speed refuellers, cabinet and stationary aviation meters, vehicle mounted meter systems, and loading rack meters. This policy is applicable to all liquid meter applications where the automatic temperature compensation feature is used for trade purposes. The purpose of this bulletin is to describe the Measurement Canada policy for the use of automatic temperature compensation (ATC) for the measurement of liquid petroleum products. Documents: Policy on Use of Automatic Temperature Compensation
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