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HOW TO CALIBRATE A METER - PMP Corp

PMP PulseHOW TO CALIBRATE A METERA ccurate calibration of fuel dispensing meters isan important responsibility of a service stationequipment taking care to conduct your tests in a preciseand consistent manner, you will accomplishseveral things: Ensure that the METER will pass inspectionby local Weights and Measures officials. Provide the station an accurate METER , onewhich is fair to both the owner and thecustomer. Increase your company s sales by detectingmeters that need to be replaced. Ensure that the tank leak detection systemhas accurate data so that leaks will bedetected and false alarms avoided.

PMP Pulse HOW TO CALIBRATE A METER Accurate calibration of fuel dispensing meters is an important responsibility of a service station equipment technician.

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Transcription of HOW TO CALIBRATE A METER - PMP Corp

1 PMP PulseHOW TO CALIBRATE A METERA ccurate calibration of fuel dispensing meters isan important responsibility of a service stationequipment taking care to conduct your tests in a preciseand consistent manner, you will accomplishseveral things: Ensure that the METER will pass inspectionby local Weights and Measures officials. Provide the station an accurate METER , onewhich is fair to both the owner and thecustomer. Increase your company s sales by detectingmeters that need to be replaced. Ensure that the tank leak detection systemhas accurate data so that leaks will bedetected and false alarms avoided.

2 Demonstrate your : The National Institute of Standards andTechnology (NIST) Handbook 44 states equipmentin service at a single place of business found to bein error predominantly in a direction favorable tothe device owner and near the tolerance limitshall not be considered maintained in a properoperational condition. This means that a stationcannot attempt to CALIBRATE all their meters tounder deliver. The calibration must be as close tozero as local Weights and Measurers regulationsand tolerances may be different than Handbook44.

3 It is important that once a METER has beencalibrated, you should follow whatever procedureis specified locally. Many localities requirenotification of the Weights and Measures PMPour test standard is: the METER must bewithin +/- 1 cubic inch of zero on fast flow andno more than 2 cubic inches between the fastflow and the slow flow readings. All of ourtest can drain times are clocked. Our test cansare level and mounted at eye level. Fast flows are run at 11 to 13 gallons per minute, and slowflows are run at to gallons per safety reasons, we conduct our tests withmineral spirits.

4 The difference between gasolineand mineral spirits generally will shift the testresults about 2 cubic inches; therefore, we makeour adjustments accordingly. However, due to thegreat variations between different fuels, it is veryimportant that all newly installed meters becalibrated in the METER calibration must be verified by per-forming a test, not just by turning the dial. Your eye must be level with the meniscuswhen you read the sight tube. Readings mustbe taken from the bottom of the meniscus. Seal calibration mechanism with a tamperproof seal.

5 Rule of Thumb - Every .001 gallon off from 0 is equivalent to 1/4 cubic inch. Forexample will be over 0 by approxi-mately one cubic inch if the METER is alreadyproperly calibrated. All meters to be shipped must be drainedof all flammable fluids due to DOT regula-tions. The inlet and outlet should be sealedwith cap plugs, plates with gaskets, o-rings,or the 2005 For Installers & TechniciansIssue No. 6 Technical Bulletin PMP Box 422 25 Security Drive Avon, Connecticut 06001860-677-9656 Toll Free 800-243-6628 Toll Free Fax 888-674-0196 Email: Website: following procedure is suggested by our staff forconducting field METER tests.

6 We have found it tobe an accurate and fast method for testing andcalibrating 1:(New or remanufactured meters ) Slowlydispense several gallons of fuel through the meterbefore attaching it to the computer or of this step is to prevent damage to thecomputer or pulser. The METER will spin rapidly as theair in the lines is displaced by fluid. Run several 5gallon drafts through the METER to completely purge itof air. Use the air bleed plug found on certain meters (older Smith, Gilbarco, and Southwest) to allowthe air to escape. All air must be purged from themeter to obtain consistent results.

7 (If the nozzle willreach the tank fill pipe, run 50 to 100 gallons throughthe METER .) This ensures that all METER parts are broken in and all air is purged. METER parts will take a set if left in storage for a long time andmust be broken in 2: Wet the can by filling your test measurewith fuel. Dump the fluid back into the tank until itstops flowing and starts to drip. Continue to drain,while counting to 10 seconds. This procedure leavesa very thin film of fluid on the inside of the can. Byusing a wet can and allowing a 10 second drainafter each 5-gallon draft, you will be able to test themeter very accurately.

8 The key is to consistentlydrainthe test can the same way. Otherwise, the variation inthickness of the film of fluid will cause your results tovary by several cubic 3:Run your first testafter resetting the computeror electronic readout to zero. Fill the test measure at fast flow . The nozzle clip is on the highest flownotch. If the nozzle has no clip, hold it wide whether there was a computer jump whenthe pump was activated. If there was a jump, yourresults will be invalid. Fill the can until you come toexactly 5 gallons on the computer or electronic computers, each.

9 001 of a gallon yourun over or under 5,000 gallons represents .231 cubicinches of fluid. Hence, .004 gallons is approximately1 cubic mechanical computers, it is essential to bring thegallon wheel back to the exact starting position. Thewidth of the 0 line on the wheel is approximatelyequivalent to one cubic inch of fluid. One trick of thetrade for mechanical computers is to set the price pergallon at $ and observe the money readout. Sincethere are 231 cubic inches per gallon, 5 gallons woulddisplay $ (5 x ) on the money wheel.

10 Each 1 off from $ is equivalent to 1 cubic inch in yourtest measure. If you failed to stop exactly at $ ( gallons), you will know how many cubic inchesyou ran over or under. Thereby, you will be able tomake a more accurate METER adjustment and save 4:Observe the position of the fluid in the testcan and adjust the meterin the direction that willbring it to the zero position. When reading the testcan, it is important that you not introduce parallaxinto your observations. That is, your eyes should belevel with the fluid level in the sight glass and theindicator line on the test can.


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