20
Seal calibration door.
How to determine a successful calibration
1
Meter verification value must be within +/- 1 cubic inch of zero at fast flow.
2
Throttled flow: Slow flow value must be within 2.5 cubic inches of the verification value above.
Factors That May Influence Calibration Values
•
TEMPERATURE: The properties of fuel cause it to expand and or contract as temperature
changes. Conditions where there is a difference between the metered fuel and the reference
initial calibration temperature could cause a measurement error of approximately 0.06% for
each 1°F degree of temperature change.
•
AIR: Hydraulic lines and piping that are not properly purged can require 2 to 4 cubic inches
to pressurize which result in negative prover readings.
•
CHECK VALVES: Malfunction of this component can cause small amount of fuel flow to be
diverted back through the idle hydraulic tree. This could cause a negative prover reading.
Figure 13.1: NA iMeter calibration seal using bracket/slats
WM048523 Rev 08 01/2019 203
13 Meter Calibration Procedure
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