Chapter 5 Operating instructions
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difference from the zero point will exist. Only when zero point reduced to a definite
degree, as compared with the physical measurement capacity, can the measuring
difference from zero point be ignored.
For an ultrasonic flowmeter, the measurement difference from zero point cannot
be ignored at low flow. It is necessary to perform a static zero set calibration to
improve low flow measurement accuracy.
Press Window M42 to set the Zero, press
first, and then wait the readings
displayed at the lower right corner reducing to be "0". If this is carried out with flow,
the flow will be displayed as "0", M43 can help to restore settings.
5.3. Scale factor
Scale factor refers to the ratio between "actual value" and "reading value". For
example, when the measurement and is 2.00, and it is indicated as 1.98 on the
instrument, the scale factor reading is 2/1.98. This means that the best scale
factor constant is 1.
However, it is difficult to keep the scale factor as "1" on the instrument especially
in batch productions. The difference is called "consistency".
During operation, there still exists possible difference in pipe parameters, etc. The
"scale factor" may be necessary when used on different pipes. Thus, scale factor
calibration is specially designed for calibrating the differences that result from
application on different pipes. The scale factor entered must be one that results
from actual calibration. The scale factor can be input in Window M45.
5.4. System lock
System lock is readable but not modifiable to prevent operation error due to
unauthorized tampering by unauthorized personnel.
Press the
keys, if displays "Unlock" on the screen, then
press the
key, enter 6 numerically long password, and then press the Enter
key to confirm.
Unlock it by using the selected password only. Press
, if "lock" is
displayed on the screen, then press the
key and enter the correct password,