Ashcroft GC52 - Rangeable wet/wet Differential Pressure Tra Manuel d'utilisateur télécharger pdf (Page 19)

11.4 Flow Measurement/Square Root Extraction Mode

Square Root Display Mode

Combining the sensing elements (orifice and pitot tube) with this prod-

uct, the mode is used for the display of the momentary flow rate, inte-

grated volume and for analog output corresponding to the momentary

flow rate.

(1) Momentary flow rate

Maximum display span from zero to the maximum momentary flow

rate. The Momentary flow rate display span depends on the set-

ting of the zero point and span point of the analog output as shown

in (2) analog output. It can display 0 to 105%F.S. of the momentary

flow rate display span. The scaling method can be performed only

by setting the maximum momentary flow rate and then generate

differential pressure using the following square root formula.

Momentary flow rate Dx is expressed by the square root formula

(a), and can be calculated only by measuring the generated differ-

ential pressure Px (percent value over the differential pressure

range).

k =

100

= k x

(%)

100(%)

公

In addition, the coefficient k is determined by substituting the

maximum momentary flow rate Dm, which is measured from the

formula (a), and the then generated differential pressure Pm into

the formula (b).

• The differential pressure generated during the maximum momen-

tary flow rate can be set in the range of 25 to 100%F.S. of the differ-

ential pressure range.

• The setting range for values of the maximum momentary flow rate

is 0 to 1999. Note: The decimal point can be set arbitrarily.

Setting of max. momentary flow rate and then

generated differential pressure ==> Setting item , , 

(a)

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Ashcroft GC52 - Rangeable wet/wet Differential Pressure Tra Manuel d'utilisateur Page 19