Calibration Benefits

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It is recommended to check and correct your fuel meters at least once a year; however, the problem with annual calibrations is that if a Weights and Measures officer stops in before you have it done, you may be out of tolerance and could incur violations that will shut you down and be quite costly. About half of our clients calibrate annually; the other half semi-annually. It’s important to note that meters can fail at any time, over-delivering individually or much more so during the blending process.

Our Semi-annual Calibration Program offers a number of benefits: 

  • It verifies, changes and re-verifies that your meters are delivering and functioning properly.
  • It checks your slow flow blends for faulty meter overages, thereby giving you peace of mind that you are not giving away any product at your pumps at any time during the year.
  • It identifies bad or faulty meters that we can replace and re-calibrate back to proper functionality.
  • It lets you know how fast you are pumping and if it is time to change your pump filters.
  • It tracks your data, and keeps your station data on file for viewing at any time.
  • It keeps you in line with Weights and Measures tolerances and ensures you will never again have to pay for a violation for meter output failure. 

Table T.2. Accuracy Classes and Tolerances for liquid Measuring Devices Covered in NIST Handbook 44, Section 3.30

Accuracy Application Acceptance Tolerance Maintenance Tolerance Special Test Tolerance
0.3
  • Petroleum products delivered from large capacity (flow rates greater than 115 L/min or 30 gpm)** devices, including motor-fuel devices
  • Heated products (other than asphalt) at or greater than 50° C
  • Asphalt at or below a temperature of 50° C
  • All other liquids not shown in the table where the typical delivery is over 200 L (50 gal)
 0.2% 0.3% 0.5%
0.3A
  • Asphalt at temperatures greater than 50° C
 0.2% 0.3% 0.5%
0.5*
  • Petroleum products delivered from small capacity (at 4 L/min (1 gpm) through 115 L/min or 30 gpm)** motor-fuel devices
  • Agri-chemical liquids
  • All other applications not shown in the table where the typical delivery is ≤200 L (50 gal)
 0.2% 0.3% 0.5%
1.1
  • Petroleum products and other normal liquids from devices with flow rates** less than 1 gpm.
  • Devices designed to deliver less than 1 gal
 0.75% 1.00% 1.25%

* For test draft < 40L 10 gal, the tolerance specified for Accuracy Class 0.5 in the table above do not apply. For these test draft, the following applies:

  1. Maintenance tolerances on normal and special tests shall be 20 mL plus 4 mL per indicated liter or 1 in3 plus 1 in3.
  2. Acceptance tolerance on normal and special tests shall be one-half the maintenance tolerance values, per indicated gallon.

1 Special test tolerance are not applicable to retail motor fuel dispensers.

** Flow rate refers to designed or makred maximum flow rate.

View NIST Handbook »

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