User manual for - FLOW METER SPP-N118
6.1.
MEASUREMENT MODE
In the measure mode, device displays instantaneous measurement (flow value or time per one
unit of flow, depending on „
F or P
” parameter value) equivalent to input current, total flow or
batcher counter value.
Instantaneous flow (flow rate) is displayed in units defined by parameter
“F unit”
(L or
m
3
) and
“Ftunit”
(min., sec. or h), with resolution defined by
“
Point
”
(max. 3 digits after
decimal point). Device converts measured current to selected units accordingly to conversion
characteristic selected by user. The measurement range equal to the nominal range is called:
nominal measurement range,
and the measurement range equal to the extended nominal
range is called:
permissible measurement range
Figure 6.1. Definitions of measurement ranges in mode 4 ÷ 20mA
If the result of measurement exceeds the
permissible measurement range
, warning
”-Hi-”
or
”-Lo-”
is displayed rather than input signal,
depends on exceeded value (see description of
“Lo r”
i
“Hi r”
parameters, paragraph
”FLouu” menu
).
Figure 6.2. Definitions of measurement ranges in mode 0 ÷ 20mA
–
If input current range is strongly overloaded, device can display improper results
–
While
time per one unit of flow is displayed
(parameter
“F or P”
= “
PEriod
”):
•
If flow value equals 0, then 0 value is displayed.
•
If value of period is to high to be fitted on 6 digits, message
“-OvLd-”
(Overload) is displayed instead of the result.
•
If flow value is different than 0 but value of period is to small to be fitted on
6 digits, message
“-UnLd-”
(Underload) is displayed instead of the result.
14
”
Lo r
” parameter
”
Hi r
” parameter
4 mA
20 mA
permissible measurement range
nominal measurement range
”
Hi r
” parameter
0 mA
20 mA
permissible measurement range
nominal measurement range
i
