Unfortunately, the traditional methods of testing and recalibration – most of which were developed over half a century ago – have many inherent limitations and failings that inhibit them from accurately testing and calibrating meters at today’s high-volume fuel sites. Accuracy is negatively impacted by factors such as vapor loss during proving, effects of temperature, imprecise meniscus readings, flow rates, leveling problems, and a lack of experience with today’s more complex dispenser equipment.
The Impact of Inaccuracy
The negative impact of inaccurate testing and recalibration can be substantial. For example, calibrating meters with a traditional “prover can” typically results in a loss of 2 to 3 cubic inches of fuel (the equivalent of about 2 shot glasses) for every 5 gallons that is dispensed. Although this variance is within the Weights and Measures tolerances, the loss adds up quickly. Consider a station dispensing 125,000 gallons/month at a loss of 3 cubic inches per 5 gallons dispensed: this station is giving away 3,900 gallons of fuel per year. The retailer is not receiving the benefit of nearly 4,000 gallons of gasoline dispensed! When that loss is multiplied throughout a chain of stations, the profit loss can be hundreds of thousands and even millions of dollars each year.
Zero in on Fuel Shrink
AccuMeasure is a closed loop mechanical prover. Instead of an open neck (traditional) system that is vulnerable to vaporization and human error, AccuMeasure is a completely closed system. During the meter proving process, air is purged from the system through a series of valves. The prover is precisely measured by a NIST traceable metrology lab to 1/100000 of a gallon, allowing incredible accuracy in testing, as well as re-calibration that approaches true zero.