Ashcroft GC52 - Rangeable wet/wet Differential Pressure Transmitter - Manual (Page 7)

7
k =
D
m
00
P
m
100
͌
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 momentary
flow rate can be set in the range of 25 to 100%F.S. of the differential
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.
• When the display resolution lowers and the wobbling of momentary flow
rate increases in the low flow domain of the differential pressure flow
meter, the domain (below the set value) will be forcedly indicated as zero
by means of the low-cut for momentary flow rate.
Moreover, the analog output has a fixed value of 4mA at the zero point.
For setting of low-cut, input the percent value over the maximum display
span. Its range is 0 to 30%F.S. and the decimal point position can be set
up to one digit after decimal point as fixed point.
(2) Analog output
The zero point (4mA) and span point (20mA) of analog output can be
set in the range of 0 to 110%F.S. of the maximum display span (0 to
maximum momentary flow rate). The span between the zero point and
the span point in this analog output is the momentary flow rate display
span.
(3) Integrated volume
• The units of integrated volume include two standards: Time factor
and flow rate volume factor.
• The number of digits of integrated volume display is
a maximum of 6 figures (999999); the display will return to 0 once the
maximum reading has been met.
999999 0 0
overflows
clr
• The zero reset of an integrated volume is executed by pressing S key for
more than 3 seconds and displaying "cLr" (clear) for 2 seconds.
• As backup in case of POWER OFF, the integrated volume value is
stored in the nonvolatile memory for every hour. After power returns,
integration starts from the integrated volume value stored in the memory.
• Integration is halted during the "FFF" display at the time of
differential pressure range OVER .
(b)