User manual - METER SUR-457
Figure 7.1 E
xample of definition of permissible range of input signal -
“
Lo r
” and “
Hi r
” parameters (
“4-20”
mode)
The
“Lo r”
parameter is important if input is set to
“4-20”
,
“1-5”
or
“2-10”
mode
only, and determines lower border of the permissible range. In the other cases (for
current and voltage ranges), lower border of the permissible range is always 0.
For example if input is set to
“4-20”
mode, then lower border is calculated due to
expression:
I
min
= 4 mA - 4 mA ×
“Lo r”
%.
The
“Lo r”
value can be set from 0 to 99.9%.
Parameter
“Hi r”
determines the upper border of the permissible range accordingly
to the expression (for all modes).
For example if input is set to
“4-20”
mode, then upper border is calculated due to
expression:
I
max
= 20 mA + 20 mA ×
“Hi r”
%.
The value of
“Hi r”
can be set from 0 to 19.9%
In example no 1 of the
DISPLAY VALUES CALCULATION
paragraph the
procedure of the permissible input range determining is presented in details.
If the measurement value do not exceeds
permissible measurement range
but
displayed value exceeds range -999 ÷ 9999, the warning
”-Ov-”
is displayed rather
than the calculated result.
7.3.6.
”OutP” menu
This menu contains parameters of analogue output control. Menu is available if the
device is equipped witch analogue output.
Analogue output can be controlled depend on both present measured value and
peak value (if peak detection is enabled).
“Omod”
- analogue output mode. Depending on version of the device there are following
options:
For active current output:
”
oFF
”
- current output disabled
,
”
0-20
”
- current output enabled with 0 ÷ 20 mA mode
,
“
4-20
”
- current output enabled with 4 ÷ 20 mA mode,
”
modb
”
- current output controlled via RS-485 interface.
34
”
Lo r
” = 75,0% (3 mA)
”
Hi r
” = 5,0 % (1 mA)
4
21
permissible measurement range
measurement result is displayed
regardless on nominal range exceeding
nominal measurement range (4-20mA)
[mA]
20
22
1
0
I
min
I
max
display
message ”
-Lo-
”
display
message ”
-Hi-
”
i
i
