Ashcroft GC51 - Industrial Rangeable Pressure Transmitter - Manual (Page 16)

16
11. MEASUREMENT MODE
The measurement mode includes pressure display mode and linear
(scaling) display mode.
11.1 Filter (Damping)
Set the filter before setting pressure display mode or linear (scal-
ing) display mode.
The filter is based on the moving average of the pressure data to
decrease display “bounce” and to smooth the analog output due to
system pressure fluctuations at the user’s discretion.
Five selections: 0, 2, 4, 8, and 16 where 0=30ms (and in this case
the filter is not active), 2=60ms, 4=120ms, 8=240ms, 16=480ms.
Note: see page 24 for full menu.
11.2 Pressure Display Mode (Re-scaling in “psi” units)
This mode is used for the display and analog output of the actual
pressure.
A.
Analog Output
The analog output can be adjusted as follows; the zero point
(4mA) and the span point (20mA) can each be adjusted from
–10 to 110%F.S. (URL).
• This means that although the zero point is typically set at
0%F.S. and the span point is set as 100%F.S., the zero point
can be adjusted to the point where zero (4mA) is 110%F.S.
and the span point (20mA) can be adjusted to –10%F.S.
thus reversing the output. In addition, through this adjust-
ment zero and span can be adjusted accordingly for elevated
tank levels.
B. Pressure Display
• The pressure display has a display span between the zero
point and the span point as determined by the adjustment of
zero and span (see previous paragraph) and can display the
range of –5 to 105%F.S.(URL). In addition, the decimal point
position of the pressure display is fixed for each pressure
range.
• Pressure Units: psi
Note: see page 24 for full menu.
Filter setting ⇒ Setting item
ቢ