Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter - Manual (Page 6)

6
Setting LCD Setting Setting
Item Display Description Range
n 00 l 0 n
Selection of linear display
mode: Lin non: Differential
pressure display
mode; Lin: Linear
display mode Display mode
-
-
p 0 - 20
Min. differential pressure
corresponding to OFFSET
ቪ :20.0(inH
2
O)
Differential pres-
sure range:
0 to 75% Span Min. differen-
tial pressure
Max. differential pressure
corresponding to FULL
SCALE
ቫ
:120(inH
2
O)
Differential
pressure range:
25 to 100%Span Max. differen-
tial pressure
p 0- 120
Display after decimal
point Number of digits:
1(digit) 0,1,2,3 digit Decimal point
position
d 0-00 1
d 0-0 0.0
d 0- 50.0
OFFSET corresponding
min. differential pressure
ቧ : 0.0 (m)
–1999 to 1999 OFFSET
FULL SCALE correspon-
ding to max. differential
pressure
ቨ :50.0 (m)
–1999 to 1999 FULL SCALE
a 0-5 0.0
Analog output zero point
: (4mA): 0.0 (%Span) Max. display span:
–10 to 110% Span Output zero
point
a 0 100.0
Analog output span point
: (20mA): 100.0 (%Span) Max. display span:
–10 to 110%Span Output span
point
D. Flow Measurement/Square Root Extraction Mode
Mode Square
Square Root Display Mode
Combining the sensing elements (orifice and pitot tube) with this product,
the mode is used for the display of the momentary flow rate, integrated
volume and for analog output corresponding to the momentary flow rate.
(1) Momentary flow rate
The momentary flow rate display has the maximum display span from
zero to the maximum momentary flow rate. The Momentary flow rate
display span
depends on the setting 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. display span. The scaling method of momentary flow rate
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 differential
pressure Px (percent value over the differential pressure range).
D
x
= k x
P
x
(%)
(a)
100(%)
͌
Note: Values shown are from example in I&M manual.