Ashcroft GC51 - Industrial Rangeable Pressure Transmitter Manuel d'utilisateur télécharger pdf (Page 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 

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Ashcroft GC51 - Industrial Rangeable Pressure Transmitter Manuel d'utilisateur Page 16