FMC Technologies Smith Meter AccuLoad, Руководство по испытанию танка

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Section IV – Factor Selection for Preliminary Proving
MN06146 Issue/Rev. 0.1 (7/10) 6
Remember the Rules
1. The maximum input frequency direct from the
meter accepted by the AccuLoad I 2,000 Hz.
2. The range of allowable Input Resolution Settings
is 25 to 9,999 pulses per whole unit of display on
the AccuLoad (i.e., gallons, liters, etc.).
3. The range of allowable Calibration Factor Set-
tings is 0.0001 to 9.9999. (Realistic calibration
factors would be between 0.85 and 1.25.)
AccuLoad II and AccuLoad III
The values programmed into an AccuLoad in order
to “match” the AccuLoad to a particular meter are al-
so of two types:
1. Input Resolution: This produces a “coarse” ad-
justment to incoming pulses similar to AccuLoad
I. The setting range is 0 to 9,999 pulses per unit
volume for AccuLoad II and 0 to 9999.999 for
AccuLoad III.
2. Meter Factor (MF): This is a high resolution fac-
tor of five digits. The setting range is 0.0001 to
9.9999 for AccuLoad II and 0.00001 to 9.99999
for AccuLoad III.
The effect of these factors is as follows:
Volume II AccuLoad
Volume Prover Tank
(MF) Factor Meter

Res.) (Input
MF Pulses Input
Volume Displayed


The AccuLoad II and III will accept up to four differ-
ent meter factors for each product (but only one in-
put resolution setting) as a function of flow rate,
which are used to “linearize” the meter’s calibration
curve.
Example 3 (AccuLoad II)
Four-inch turbine meter with a “K” factor of 25.327
pulses per gallon
1. Select the nearest whole number to 25.327,
which is 25. This becomes the Input Resolution
Setting.
2. Divide 25 by 25.327 to determine the Meter Fac-
tor Setting.
98708 . 0
327 . 25
25
MF
 
Round off to four places to the right of the decimal
(because only five digits are allowed). The result is a
Meter Factor Setting of 0.9871.
Example 4 (AccuLoad II)
Six-inch positive displacement meter that generates
100.15 pulses per gallon from its transmitter
1. Set the Input Resolution Setting to 100 (the
nearest whole number).
2. Divide 100.15 by 100 to determine the Meter
Factor Setting.
99850 . 0
15 . 100
100
MF
 
Round off to four places to the right of the decimal
(because only five digits are allowed). The result is a
Meter Factor Setting of 0.9985.
Example 5 (AccuLoad III)
Four-inch turbine meter with a “K” factor of 25.327
pulses per gallon
1. Set the input resolution of 25.327 into the “K”
factor.
2. Enter 1.00000 as the meter factor.
Example 6 (AccuLoad III)
Six-inch positive displacement meter that generates
100.15 pulses per gallon from its transmitter
1. Set the input resolution of 100.15 into the “K”
factor.
2. Enter 1.00000 as the meter factor.