Vishay G4, Техническое руководство, Страница: 100 / 200

Technical Manual
5-14
Flow rate
General
The G4 instrument includes a program option for flow measurement. The option can
be activated by an individual code for each instrument. The code can be ordered from
your supplier. The program option code should be entered in the ‘Program Options’
menu. See chapter ‘Set-up’.
The flow rate value can be shown on the display, checked by the level supervision,
sent to an analog output and it can also be fetched by communication.
Operation
The G4 instrument calculates the flow by measuring the weight change during a
selected integration time and dividing by the time.
The flow rate can be displayed as weight change per second, per minute
or per hour.
It will display weight or flow value, and switch over between weight and flow is
accomplished with the function key sequence 'W/F'. See section ‘Weight Display’ in this
chapter. Switch over can also be accomplished by a digital input or a communication
command.
Changing and storing
Parameters entered to define flow rate parameters will not be lost if the instrument is
switched off.
Parameter editing can be performed in menu ‘Param. Set-up/Calibration’ where Scale
X’ is selected, by the panel keys. Note that there are flow rate parameters for each
scale in the instrument. Flow calculation is set-up individually for each scale.
Setting of flow rate resolution
Parameter ‘Flow Rate Res.’ defines the decimal point position and resolution for the
flow rate value. All set-up parameters using the flow rate unit will be written
with the decimal point position selected in this menu. If the last digits of the flow
rate value are not stable, a more coarse resolution can be selected to get a stable
reading. A more coarse resolution will also result in a shorter derivation time
(if ‘Auto Deriv. T’ is set to ‘On’).