Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter - Manual (Page 15)

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11. MEASUREMENT MODE
The measurement mode includes differential pressure display mode, and
linear (scaling) display mode. For the setting items
ቢ
to
k
27
, please refer to
the Setting Mode (section14).
11.1 Filter
Set the filter before setting pressure display mode or linear (scaling)
display mode.
The filter is based on the moving average of the pressure data to de-
crease display “bounce” and to smooth the analog output due to sys-
tem pressure fluctuations at the user’s discretion.
Five selections: (0, 2, 4, 8, and 16 seconds).
If “0” is selected the filter is not applied.
See Section 14.4 for full menu.
Filter Setting ==> item
ቢ
11.2 Differential Pressure Display Mode (Re-scaling in “inH
2
0” units)
This mode is used for display and analog output of the actual differ-
ential pressure.
(1) 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)*.
(2) 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 Unit: in.H
2
O
See Section 14.4 for full menu.
Output zero point and span point setting ==> Setting item
ቤ
,
ብ
*This means that although the zero point is typically set at 0%F.S. (in the case of bi-directional
ranges 0%Span) 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 adjustment zero and span can be adjusted accord-
ingly for elevated tank levels.