Vishay G4, Technical Manual, Page: 101 / 200

G4 Multi Channel Weighing Instrument
5-15
Setting of flow rate unit
Parameter ‘Flow Rate Unit’ defines the engineering unit that should be used
for the flow rate value and for related set-up parameters.
If the flow rate unit exceeds 4 characters then it will be represented as ”/s”, ”/min”,”/h”,
”*/mi” or ”*/h” in the set-up menus.
In the case of ”Unit*1000/m” or ”Unit*1000/h” then some flow rate units
will be preceded by a ”k”.
Other flow rate units will be converted, according to the table below.
Measurement unit Flow rate unit * 1000
kg t
kN MN
kPa Mpa
MPa GPa
l m3
kgf Mgf
kN/m MN/m
mV/V V/V
Setting of flow rate derivation time
To enable the instrument to make a correct measurement of flow rates, a derivation
time must be selected in accordance with the desired accuracy.
If ‘Auto Deriv. T’ is set to ‘On’ then the instrument will calculate a derivation time based
on the current calibration (including filter parameters), the ‘Flow Rate Res.’ and the
‘Flow Rate Unit’. The instrument tries to calculate a derivation time that will give a
stable and accurate flow rate value at the current settings (provided that the flow is
stable).
A longer filter time and/or a coarser ‘Flow Rate Res.’ will give shorter derivation times.
The automatically calculated derivation is limited to its defined max. and min. values.
If ‘Auto Deriv. T’ is set to ‘Off’, then the derivation time (‘Deriv. Time’) must be entered
manually. The instrument will accept any derivation (within its min. and max. limits) and it
is up to the user to select a suitable derivation time for the application.
When the scale update rate or the derivation time is changed the derivation time
is adjusted, by the instrument, to the nearest possible value depending on
the update rate.