Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter - Manual (Page 23)

23
Ⅵ Square Root
The momentary flow rate Dx at a generated differential pressure of 16 I W
(40%F.S.) is calculated by the following formula:
The coefficient k is determined by substituting the maximum momentary flow
rate Dm=120 and the then differential pressure Pm=80%F.S.(32
I W) into the
formula (b) of the preceding paragraph 11.4 (1).
120
(Dx)
(Max.)
84.9
0 20 40 60 80 100
Differential Pressure
(%F.S.)
Momentary Flow Rate
(16 IW) (32 IW)
k =
D
m
00
P
m
100
D
x
= kx
P
x
100
40
100
͌ ͌
͌
120
80
100
͌
Therefore, the momentary flow rate Dx is determined by the formula (a) of
the preceding paragraph 11.4(1).
= = 134.2
= 84.9 = 134.2
Ⅵ Setting example 4: Arbitrary unit of square root display mode
ቢ Setting of momentary flow rate
In order to set a momentary flow rate to an “arbitrary unit,” the
momentary flow rate unit must be set as the arbitrary unit, and the
maximum momentary flow rate of the arbitrary unit and the then
generated differential pressure must be set.