D625 Users Manual
DENSITY OUTPUT – FIELD CALIBRATION
The ANALYTICAL FLOW TECHNOLOGIES D625 meter is calibrated at the factory with many various
fluids and various flow rates – however, there may be occasions where field calibration (adjustment
of the K
0
density coefficient) is required. Many factors influence whether an adjustment of the K
0
density coefficient is required, such as:
Process pipeline flow rates
Noise or vibration in the process pipeline
Temperature differential
WHEN TO FIELD CALIBRATE…
If the density meter is CONSISTENTLY displaying a density output reading that is above or below
the ACTUAL density of the fluid flowing through the pipe a simple adjustment of the K
0
density
coefficient can be performed so that the meter is calibrated to the actual fluid.
The K
0
density coefficient can be found on the Calibration Certificate that was included with your
density meter. The K
0
density coefficient can also be read (and displayed) by the included
Windows ® Software that shipped with your meter. The Windows® software is also required
when making adjustments to K
0
.
FIELD CALIBRATION EXAMPLE:
An example of a K
0
adjustment might be as follows:
Distilled Water at 68°F (and minimal pressure) flowing through the meter reads (outputs) 0.99865
gr/cm
3
on the meter, but we know (from tables, or hydrometer, pycnometer, etc) that distilled
water has a density of 0.99740 gr/cm
3
at 68°F. This means that the meter has an error offset of
+0.00125 gr/cm
3
at 68°F.
We can correct that error by simply adjusting the K
0
density coefficient by the amount of the error
offset, and then entering the new K
0
density coefficient into the density processor or flow
computer.
EQUATION 4: K
0
DENSITY OFFSET EQUATION
The table below guides you through the K
0
Coefficient adjustment for the above Example.
CONTACT ANALYTICAL FLOW TECHNOLOGIES ENGINEERS WITH ANY QUESTIONS CONCERNING
YOUR SPECIFIC APPLICATION.
When comparing density readings of any fluids – the temperature (and pressure) of the
fluid must be consistent (the same) for each device measuring density.
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