Calibrate Flow Rate; Kc Calibration - Siemens SITRANS F Instruction Manual

Section 2
To Enable (or Disable) the Makeup Latch:
To access the [Makeup Latch] option list press
To move the cursor to select either [On or Off] press
To turn Makeup Latch [On] or [Off] press

2.7.3 CALIBRATE FLOW RATE

The FUE1010EN intrinsic calibration is excellent as confirmed by numerous laboratory and field trials
under diverse application conditions. We thus can confidently say that in any given application, the ma-
jority of conventional flowmeters can not match the system's measurement range or its linearity. Some
applications may require an output adjustment to match an official external reference. The [Calibrate
Flow Rate] menu allows you to select a calibration mode. The right-hand column shows the active
calibration mode. You can select Intrinsic (factory), Kc (Slope Correction) or Multipoint (Non-linear) Cali-
bration. Selecting either of the external calibration modes will not eliminate the Intrinsic (factory) calibra-
tion. You can use this menu cell to switch between Intrinsic, Kc or Multipoint at any time.

Kc Calibration

For most applications, the measured flow range produces a linear meter response. Therefore, the Kc
(slope correction) calibration is the preferred method since it only requires a single correction factor for
all the flow rates encountered. Changing the calibration can cause profound changes in a flowmeter's
operating characteristics. Use only the most respected flow standard to obtain a correction factor. The
percentage you enter must provide an accurate and consistent shift across the entire flow range antici-
pated for the application.
To obtain the Kc factor, compare flow total data taken simultaneously from the FUE1010EN and a refer-
ence meter whose accuracy meets the required standard. Allow both meters to accumulate flow total
data long enough to average out any differences due to flow fluctuation between the two meter loca-
tions. Compare outputs of the two totalizers to determine percentage increase (+) or decrease (-) that is
necessary to produce the best average correlation between System 1010 and the reference standard.
For example, entering [-0.29] will produce a reduction of 0.29% in the calibration at all flow rates.
To calculate Kc:
Kc =
Kc =
To enter the Kc Factor:
To enable numeric entry press
Use the numeric keys to type the required Kc (as calculated above). Note that the Kc value can
be negative or positive. Enter the - or + sign first, then type in the calibrated value.
To store the data press
Flow Rate] menu cell with its new value. Also note that this Kc value can be viewed on the site
printout.
Actual Rate
x 100
x 100
Indicated Rate -1
ENT
. Note that Kc now appears in the right-hand column of the [Calibrate
ENT
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