Siemens FUS1010, Operating Instructions Manual, Page: 114 / 298

Functions
7.4 Span Data
FUS1010 IP65 NEMA 4X & IP66 NEMA 7
Operating Instructions, 01/2013, A5E02951520-AC
113
7.4 Span Data
The [Span Data] menu allows you to set 0% and 100% output limits for volumetric flow (Vfo),
absolute flow (Vfab) and sonic velocity (Vs). Each menu cell shows appropriate rate units
and time base. If you change flow rate units after spanning the system, the computer
automatically updates the output data setup to reflect the change. Span limits apply to both
the analog outputs and the on-screen strip chart. The flow outputs operate as follows:
Vfo
Spanned Volumetric::
The minimum and maximum flow rate entries
establish the Vfo span. The Max Flow menu cell
sets 100% of span. The Min Flow menu cell sets
0% of span. Use signed numbers for bi-
directional spanning. Note that negative (reverse)
flow always is lower than positive flow, whatever
its absolute magnitude. For example, for a flow
measurement range of -30 GPM to +10 GPM, the
4mA span will be -30 GPM, and the 20mA span
will be +10 GPM.
Vfab
Spanned Absolute Volumetric Flow Rate:
Vfab is the absolute magnitude of the volumetric
flow rate (Vfo). There are no menu cells provided
to span this output. Vfab shares the Vfo span
entries. The Vfab minimum span is always zero.
The maximum span for Vfab is the largest
absolute value of either the min. or the max. flow
rate (Vfo) entries. For example, a span between
+10 GPM and -30 GPM, spans the Vfab output
from 0 GPM to 30 GPM.
Vs
Spanned liquid sonic Velocity:
Vs is the sonic velocity in meters-per-second
(m/s) of the flowing liquid. The min. and max. Vs
entries establish the Vs span. Max Vs (m/s)
defines 100% of span. The Min Vs (m/s) defines
0% of span.
Maximum span values represent: Minimum span values represent:
100% of span
Current output of 20mA
Voltage output of 10 VDC
Pulse output of 5000 Hz 0% of span
Current output of 4mA
Voltage output of 0 VDC
Pulse output of 0 Hz