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Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter User Manual

Page 16

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16

Ⅵ Display and analog output

Ex. Differential pressure of 8 inH

2

O

• Differential pressure display: 8.00(H

2

O)

• Analog output: 12(mA) in.H

2

O

8.00

Differential

Pressure

Analog

Display

Output

(inH

2

O)

(mA)

Output span point

18.00 ==> 20

͐

͐

8.00 ==> 12

Output zero points

–2.00

0

==>

4

Setting example 1 : Differential pressure display mode

The setting to use the differential pressure range 0 to 20in.H

2

O (“W.C.)

and to display the zero point and span point of the analog output as –2
in.H

2

O and 18 in.H

2

O respectively is as follows:

In the example the filter (moving average time) is set at 2 seconds, the
differential pressure display and the analog output are based on the
moving average equivalent to the differential pressure data per 100ms
for the past 2 seconds (20 times).

Select the filter of “2 seconds”

==> Setting item

Select the “Differential pressure display mode”

==> Setting item

Set output zero point as “–10.0%F.S.”

==> Setting item

Set output span point as “90.0%F.S.”

==> Setting item

11.3 Linear Display Mode (Re-scaling in arbitrary user defined units)

This mode is used for display / analog output of the scaling value
where the differential pressure is linearly converted to an arbitrary
physical quantity.

(1) Linear display

By setting the OFFSET to the minimum differential pressure P

1

and the FULL SCALE to the maximum differential pressure P

2

,

the linear display indicates the value on the line between the two
points (the maximum display span). The actual linear display
span depends on the setting of the zero point and span point of
the analog output as shown in (2) of the next page. It can display
the range of –5 to 105%F.S. of the linear display span.